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Can Mobile Health Apps Improve Oral-Chemotherapy Adherence? The Benefit of Gamification.

Reporter: Stephen J. Williams, PhD

Article ID #144: Can Mobile Health Apps Improve Oral-Chemotherapy Adherence? The Benefit of Gamification. Published on 6/17/2014

WordCloud Image Produced by Adam Tubman

A report on how gamification mobile applications, like CyberDoctor’s PatientPartner, may improve patient adherence to oral chemotherapy.

(includes interviews with CyberDoctor’s CEO Akhila Satish and various oncologists)

 

Writer/Curator: Stephen J. Williams, Ph.D.

UPDATE 5/15/2019

Please see below for an UPDATE on this post including results from the poll conducted here on the value of a gamification strategy for oral chemotherapy patient adherence as well as a paper describing a well designed development of an application specifically to address this clinical problem.

Studies have pointed to a growing need to monitor and improve medical adherence, especially with outpatient prescription drugs across many diseases, including cancer.

The trend to develop oral chemotherapies, so patients can take their medications in the convenience of their home, has introduced produced a unique problem concerning cancer patient-medication adherence. Traditionally, chemotherapies were administered by a parental (for example intravenous) route by clinic staff, however, as noted by Jennifer M Gangloff in her article Troubling Trend: Medication Adherence:

 

with the trend of cancer patients taking their oral medication at home, the burden of adherence has shifted from clinicians to the patients and their families.

 

A few highlights from Jennifer Gangloff’s article highlight the degree and scope of the problem:

 

  1. There is a wide range of adherence for oral chemo– as low as 16% up to 100% adherence rates have been seen in multiple studies
  2. High cost in lives and money: estimates in US of 125,000 deaths and $300 billion in healthcare costs due to nonadherence to oral anticancer medications
  3. Factors not related to the patient can contribute to nonadherence including lack of information provided by the healthcare system and socioeconomic factors
  4. Numerous methods to improve adherence issues (hospital informative seminars, talking pill bottles, reminder phone calls etc.) have met with mixed results.

 

A review by Steve D`Amato of published literature also highlights the extent of problems with highly variable adherence rates including

  • 17-27% for hematologic malignancies
  • 53-98% for breast cancer
  • 97% for ovarian cancer

More strikingly, patient adherence rates can drastically decline over treatment, with one study showing an adherence rate drop from 87% to 50% over 4 years of adjuvant tamoxifen therapy.

 

Tackling The Oral Chemotherapy-Patient Adherence Problem

 

Documented factors leading to non-adherence to oral oncology medications include

  1. Patient feels better so stop taking the drug
  2. Patient feels worse so stops taking the drug
  3. Confusing and complicated dosing regimen
  4. Inability to afford medications
  5. Poor provider-patient relationships
  6. Adverse effects of medication
  7. Cognitive impairment (“chemo fog”; mental impairment due to chemotherapy
  8. Inadequate education/instruction of discharge

There are many examples of each reason why a patient stopped taking medication. One patient was prescribed capecitabine for her metastatic breast cancer and, upon feeling nausea, started to use antacids, which precipitated toxicities as a result of increased plasma levels of capecitabine.

In a white paper entitled Oral Oncology Treatment Regimens and the Role of Medication Therapy Management on Patient Adherence and Compliance, David Reese, Vice President Oncology at Tx Care Advantage discus how Medication Therapy Management (MTM) programs could intervene to improve medical adherence in both the oncology and non-oncology setting.

This review also documented the difficulties in accurately measuring patient adherence including:

  • Inaccuracy of self-reporting
  • Lack of applicability of external measurements such as pill counts
  • Hawthorne effect: i.e. patient pill documentation reminds them to take next dose

The group suggests that using MTM programs, especially telephony systems involving oncology nurses and pharmacists and utilizing:

  • Therapy support (dosing reminders)
  • Education
  • Side effect management

 

may be a cost-efficient methodology to improve medical adherence.

 

Although nurses are important intermediary educating patients about their oral chemotherapies, it does not appear that solely relying on nurses to monitor patient adherence will be sufficient, as indicated in a survey-based Japanese study.

As reported in May 12, 2014 | Oncology Nursing By Leah Lawrence

 

Systematic Nurse Involvement Key as Oral Chemotherapy Use Grows– at: http://www.cancernetwork.com/oncology-nursing/systematic-nurse-involvement-key-oral-chemotherapy-use-grows

 

Survey results indicated that 90% of nurses reported asking patients on oral chemotherapy about emergency contacts, side effects, and family/friend support. Nurses also provided patients with education materials on their assigned medication.

However, less than one-third of nurses asked if their patients felt confident about managing their oral chemotherapy.

“Nurses were less likely to ask adherence-related questions of patients with refilled prescriptions than of new patients,” the researchers wrote. “Regarding unused doses of anticancer agents, 35.5% of nurses reported that they did not confirm the number of unused doses when patients had refilled prescriptions.”

From the Roswell Park Cancer Institute blog post Making Mobile Health Work

https://www.roswellpark.org/partners-practice/white-papers/making-mobile-health-work

US physicians are recognizing the need for the adoption of mobile in their practice but choice of apps and mobile strategies must be carefully examined before implementation. In addition, most physicians are using mobile communications as a free-complementary service and these physicians are not being reimbursed for their time.

 

Some companies are providing their own oncology-related mobile app services:

CollabRx Announces Oncology-Specific Mobile App with Leading Site for Healthcare Professionals, MedPage Today

(http://www.collabrx.com/collabrx-announces-oncology-specific-mobile-app-with-leading-site-for-healthcare-professionals-medpage-today/)

San Francisco, August 13, 2013CollabRx, Inc. (NASDAQ: CLRX), a healthcare information technology company focused on informing clinical decision making in molecular medicine, today announced a multi-year agreement with Everyday Health’s MedPage Today. The forthcoming app, which will target oncologists and pathologists, will focus on the molecular aspects of laboratory testing and therapy development. Over time, the expectation is that this app will serve as a comprehensive point of care resource for physicians and patients to obtain highly credible, expert-vetted and dynamically updated information to guide cancer treatment planning.

The McKesson Foundation’s Mobilizing for Health initiative

has awarded a grant to Partners HealthCare’s Center for Connected Health to develop a mobile health program that uses a smartphone application to help patients with cancer adhere to oral chemotherapy treatments and monitor their symptoms, FierceMobileHealthcare reports.

 

CancerNet announces mobile application (from cancer.net)

http://www.cancer.net/navigating-cancer-care/managing-your-care/mobile-applications

 

However, there is little evidence that the plethora of cancer-based apps is providing any benefit with regard to patient outcome or adherence, as reported in to an article in the Journal of Medical Internet Research, reported at FierceMobileHealthcare (Read more: Cancer smartphone apps for consumers lack effectiveness – FierceMobileHealthcare http://www.fiercemobilehealthcare.com/story/cancer-smartphone-apps-consumers-lack-effectiveness/2013-12-26#ixzz34ucdxVcU )

The report suggests that there are too many apps either offering information, suggesting behavior/lifestyle changes, or measuring compliance data but little evidence to suggest any of these are working the way they intended. The article suggests the plethora of apps may just be adding to the confusion.

Johnson&Johnson’s Wellness & Prevention unit has launched a health-tracking app Track Your Health. Although the company considers it a “gamification“ app, Track Your Health© operates to either feed data from other health tracking apps or allow the user to manually input data.
Read more: J&J launches ‘quantified self’ app to game patients into better behavior – FiercePharmaMarketing http://www.fiercepharmamarketing.com/story/jj-launches-quantified-self-app-game-patients-better-behavior/2014-05-28#ixzz34uhFDJr2

Even ASCO has a list of some oncology-related apps (http://connection.asco.org/commentary/article/id/3123/favorite-hematology-oncology-apps.aspx) and

NIH is offering grants for oncology-related app development (https://www.linkedin.com/groupItem?view=&gid=72923&type=member&item=5870221695683424259&qid=dbf53031-dd21-443c-9152-fad87f85d200&trk=groups_most_popular-0-b-ttl&goback=.gmp_72923)
As reports and clinicians have stated, we need health outcome data and clinical trials to determine the effective of these apps.

MyCyberDoctor™, a True Gamification App, Shows Great Results in Improving Diabetics Medical Adherence and Health Outcome

 

Most of the mobile health apps discussed above, would be classified as tracking apps, because the applications simply record a patient’s actions, whether filling a prescription, interacting with a doctor, nurse, pharmacist, or going to a website to gain information. However, as discussed before, there is no hard evidence this is really impacting health outcomes.

 

Another type of application, termed gamification apps, rely on role-playing by the patient to affect patient learning and ultimately behavior.

An interested twist on this method was designed by Akhila Satish, CEO and developer of CyberDoctor and a complementary application PatientPartner.

Akhila Satish Picture

 

 

Ms. Akhila Satish, CEO CyberDoctor

 

 

 

 

 

 

 

Please watch video of interview with Akhila Satish, CEO of CyberDoctor at the Health 2.0 conference http://vimeo.com/51695558

 

And a video of the results of the PatientPartner clinical trial here: http://vimeo.com/79537738

 

As reported here, the PatientPartner application was used in the first IRB-approved mhealth clinical-trial to see if the gamification app could improve medical adherence and outcomes in diabetic patients. PatientPartner is a story-driven game in changing health behavior and biomarkers (blood glucose levels in this trial). In the clinical trial, 100 non-adherent patients with diabetes played the PatientPartner game for 15 minutes. Results were amazing, as the trial demonstrated an increase in patient adherence, with only 15 minutes of game playing.

Results from the study

Patients with diabetes who used PatientPartner showed significant improvement in three key areas – medication, diet, and exercise:

  • Medication adherence increased by 37%, from 58% to 95% – equivalent to three additional days of medication adherence per week.
  • Diet adherence increased by 24% – equivalent to two days of additional adherence a week.
  • Exercise adherence increased by 14% – equivalent to one additional day of adherence per week.
  • HbA1c (a blood sugar measure) decreased from 10.7% to 9.7%.

As mentioned in the article:

The unique, universal, non-disease specific approach allows PatientPartner to be effective in improving adherence in all patient populations.

PatientPartner is available in the iTunes store and works on the iPhone and iPod Touch. For information on PatientPartner, visit www.mypatientpartner.com.

Ms. Satish, who was named one of the top female CEO’s at the Health Conference, gratuitously offered to answer a few questions for Leaders in Pharmaceutical Business Intelligence (LPBI) on the feasibility of using such a game (role-playing) application to improve medical adherence in the oncology field.

LPBI: The results you had obtained with patient-compliance in the area of diabetes are compelling and the clinical trial well-designed.  In the oncology field, due to the increase in use of oral chemotherapeutics, patient-compliance has become a huge issue. Other than diabetes, are there plans for MyCyberDoctor and PatientPartner to be used in other therapeutic areas to assist with patient-compliance and patient-physician relations?

Ms. Satish: Absolutely! We tested the application in diabetes because we wanted to measure adherence from an objective blood marker (hbA1c). However, the method behind PatientPartner- teaching patients how to make healthy choices- is universal and applicable across therapeutic areas. 

LPBI: Recently, there have been a plethora of apps developed which claim to impact patient-compliance and provide information. Some of these apps have been niche (for example only providing prescription information but tied to pharmacy records and company databases). Your app seems to be the only one with robust clinical data behind it and approaches from a different angle, namely adjusting behavior using a gamefying experience and teaching the patient the importance of compliance. How do you feel this approach geared more toward patient education sets PatientPartner apart from other compliance-based apps?

Ms. Satish: PatientPartner really focuses on the how of patient decision making, rather than the specifics of each decision that is made. It’s a unique approach, and part of the reason PatientPartner works so effectively with such a short initial intervention! We are able to achieve more with less “app” time as a result of this method.  

LPBI: There have been multiple studies attempting to correlate patient adherence, decision-making, and health outcome to socioeconomic status. In some circumstances there is a socioeconomic correlation while other cases such as patient-decision to undergo genetic testing or compliance to breast cancer treatment in rural areas, level of patient education may play a bigger role. Do you have data from your diabetes trial which would suggest any differences in patient adherence, outcome to any socioeconomic status? Do you feel use of PatientPartner would break any socioeconomic barriers to full patient adherence?

Ms. Satish: Within our trial, we had several different clinical sites. This helped us test the product out in a broad, socioeconomically diverse population. It is our hope that with a tool as easy to scale and use as PatientPartner we have the opportunity to see the product used widely, even in populations that are traditionally harder to reach.  

LPBI: There has been a big push for the development of individual, personalized physician networks which use the internet as the primary point of contact between a primary physician and the patient. Individuals may sign up to these networks bypassing the traditional insurance-based networks. How would your application assist in these types of personalized networks?

Ms. Satish: PatientPartner can easily be plugged into any existing framework of communication between patient and provider. We facilitate patient awareness, engagement and accountability- all of which are important regardless of the network structure.

LBPI: Thank you Akhila!

A debate has begun about regulating mobile health applications, and although will be another post, I would just like to summarize a nice article in May, 2014 Oncology Times by Sarah Digiulo “Mobile Health Apps: Should They be Regulated?

In general, in the US there are HIPAA regulations about the dissemination of health related information between a patient and physician. Most of the concerns are related to personal health information made public in an open-access platform such as Twitter or Facebook.

In addition, according to Dr. Don Dizon M.D., Director of the Oncology Sexual Health Clinic at Massachusetts General Hospital, it may be more difficult to design applications directed against a vast, complex disease like cancer with its multiple subtypes than for diabetes.

 

Mobile Health Applications on Rise in Developing World: Worldwide Opportunity

 

According to International Telecommunication Union (ITU) statistics, world-wide mobile phone use has expanded tremendously in the past 5 years, reaching almost 6 billion subscriptions. By the end of this year it is estimated that over 95% of the world’s population will have access to mobile phones/devices, including smartphones.

This presents a tremendous and cost-effective opportunity in developing countries, and especially rural areas, for physicians to reach patients using mHealth platforms.

Drs. Clara Aranda-Jan Neo Mohutsiwa and Svetla Loukanova had conducted a systematic review of the literature on mHealth projects conducted in Africa[1] to assess the reliability of mobile phone and applications to assist in patient-physician relationships and health outcomes. The authors reviewed forty four studies on mHealth projects in Africa, determining their:

  • strengths
  • weaknesses
  • opportunities
  • threats

to patient outcomes using these mHealth projects. In general, the authors found that mHealth projects were beneficial for health-related outcomes and their success related to

  • accessibility
  • acceptance and low-cost
  • adaptation to local culture
  • government involvement

while threats to such projects could include

  • lack of funding
  • unreliable infrastructure
  • unclear healthcare system responsibilities

Dr.Sreedhar Tirunagari, an oncologist in India, agrees that mHealth, especially gamification applications could greatly foster better patient education and adherencealthough he notes that mHealth applications are not really used in India and may not be of much use for those oncology patients living in rural areas, as  cell phone use is not as prevalent as in the bigger inner cities such as Delhi and Calcutta.

 

Dr. Louis Bretes, an oncologist from Portugal, when asked

1) do you see a use for such apps which either track drug compliance or use gamification systems to teach patients the importance of continuing their full schedule of drug therapy

2) do you feel patient- drug compliance issues in the oncology practice is due to lack of information available to the patient or issues related to drug side effects?

“I think that Apps could help in this setting, we are in
Informatics era but..
The main question is that chronic patients are special ones.
Cancer patients have to deal with prognosis, even in therapies
with curative intent such as aromatase inhibitors are potent
Drugs that can cure; only in the future the patients know.
But meanwhile he or she has to deal with side-effects every day. A PC can help but suffer this symptoms…it. Is a real problem believe me!”

“The main app is his/her doctor”

I would like to invite all oncologists to answer the poll question ABOVE about the use of such gamification apps, like PatientPartner, for improving medical adherence to oral chemotherapy.

UPDATE 5/15/2019

The results of the above poll, although limited, revealed some interesting insights.  Although only five oncologists answered the poll whether they felt gamification applications could help with oral chemotherapy patient adherence, all agreed it would be worthwhile to develop apps based on gamification to assist in the outpatient setting.  In addition, one oncologist felt that the success of mobile patient adherence application would depend on the type of cancer.  None of the oncologist who answered the survey thought that gamification apps would have no positive effect on patient adherence to their chemotherapy.  With this in light, a recent paper by Joel Fishbein of University of Colorado and Joseph Greer from Massachusetts General Hospital, describes the development of a mobile application, in clinical trial, to promote patient adherence to their oral chemotherapy.

 

Mobile Applications to Promote Adherence to Oral Chemotherapy and Symptom Management: A Protocol for Design and Development

 

Mobile Application to Promote Adherence to Oral Chemotherapy and Symptom Management: A Protocol for Design and Development. Fishbein JNNisotel LEMacDonald JJAmoyal Pensak NJacobs JMFlanagan CJethwani K Greer JAJMIR Res Protoc. 2017 Apr 20;6(4):e62. doi: 10.2196/resprot.6198. 

 

Abstract 

BACKGROUND:

Oral chemotherapy is increasingly used in place of traditional intravenous chemotherapy to treat patients with cancer. While oral chemotherapy includes benefits such as ease of administration, convenience, and minimization of invasive infusions, patients receive less oversight, support, and symptom monitoring from clinicians. Additionally, adherence is a well-documented challenge for patients with cancer prescribed oral chemotherapy regimens. With the ever-growing presence of smartphones and potential for efficacious behavioral intervention technology, we created a mobile health intervention for medication and symptom management.

OBJECTIVE:

The objective of this study was to develop and evaluate the usability and acceptability of a smartphone app to support adherence to oral chemotherapy and symptom management in patients with cancer.

METHODS:

We used a 5-step development model to create a comprehensive mobile app with theoretically informed content. The research and technical development team worked together to develop and iteratively test the app. In addition to the research team, key stakeholders including patients and family members, oncology clinicians, health care representatives, and practice administrators contributed to the content refinement of the intervention. Patient and family members also participated in alpha and beta testing of the final prototype to assess usability and acceptability before we began the randomized controlled trial.

RESULTS:

We incorporated app components based on the stakeholder feedback we received in focus groups and alpha and beta testing. App components included medication reminders, self-reporting of medication adherence and symptoms, an education library including nutritional information, Fitbit integration, social networking resources, and individually tailored symptom management feedback. We are conducting a randomized controlled trial to determine the effectiveness of the app in improving adherence to oral chemotherapy, quality of life, and burden of symptoms and side effects. At every stage in this trial, we are engaging stakeholders to solicit feedback on our progress and next steps.

CONCLUSIONS:

To our knowledge, we are the first to describe the development of an app designed for people taking oral chemotherapy. The app addresses many concerns with oral chemotherapy, such as medication adherence and symptom management. Soliciting feedback from stakeholders with broad perspectives and expertise ensured that the app was acceptable and potentially beneficial for patients, caregivers, and clinicians. In our development process, we instantiated 7 of the 8 best practices proposed in a recent review of mobile health app development. Our process demonstrated the importance of effective communication between research groups and technical teams, as well as meticulous planning of technical specifications before development begins. Future efforts should consider incorporating other proven strategies in software, such as gamification, to bolster the impact of mobile health apps. Forthcoming results from our randomized controlled trial will provide key data on the effectiveness of this app in improving medication adherence and symptom management.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT02157519; https://clinicaltrials.gov/ct2/show/NCT02157519 (Archived by WebCite at http://www.webcitation.org/6prj3xfKA).

In this paper, Fishbein et al. describe the  methodology of the developoment of a mobile application to promote oral chemotherapy adherence.   This mobile app intervention was named CORA or ChemOtheRapy Assistant.

Of the approximately 325,000 health related apps on the market (as of 2017), the US Food and Drug Administration (FDA) have only reviewed approximately 20 per year and as of 2016 cleared only about 36 health related apps.

According to industry estimates, 500 million smartphone users worldwide will be using a health care application by 2015, and by 2018, 50 percent of the more than 3.4 billion smartphone and tablet users will have downloaded mobile health applications.  However, there is not much scientific literature providing a framework for design and creation of quality health related mobile applications.

Methods

The investigators separated the app development into two phases: Phase 1 consisted of the mobile application development process and initial results of alpha and beta testing to determine acceptability among the major stakeholders including patients, caregivers, oncologists, nurses, pharmacists, pharmacologists, health payers, and patient advocates.  Phase 1 methodology and results were the main focus of this paper.  Phase 2 consists of an ongoing clinical trial to determine efficacy and reliability of the application in a larger number of patients at different treatment sites and among differing tumor types.

The 5 step development process in phase 1 consisted of identifying features, content, and functionality of a mobile app in an iterative process, including expert collaboration and theoretical framework to guide initial development.

There were two distinct teams: a research team and a technical team. The multidisciplinary research team consisted of the principal investigator, co-investigators (experts in oncology, psychology and psychiatry), a project director, and 3 research assistants.

The technical team consisted of programmers and project managers at Partners HealthCare Connected Health.  Stakeholders served as expert consultants including oncologists, health care representatives, practice administrators, patients, and family members (care givers).  All were given questionaires (HIPAA compliant) and all involved in alpha and beta testing of the product.

There were 5 steps in the development process

  1. Implementing a theoretical framework: Patients and their family caregivers now bear the primary responsibility for their medical adherence especially to oral chemotherapy which is now more frequently administered in the home setting not in the clinical setting.  Four factors were identified as the most important barriers to oral chemotherapy adherence: complexity of medication regimes, symptom burden, poor self-management of side effects, and low clinical support.  These four factors were integral in the design of the mobile app and made up a conceptual framework in its design.
  1. Conducting Initial Focus Group Interviews with key stakeholders: Stakeholders were taken from within and outside the local community.  In all 32 stakeholders served as study collaborators including 8 patient/families, 8 oncologists/clinicians, 8 cancer practice administrators, and 8 representatives of the health system, community, and overall society.   The goal of these focus groups were to obtain feedback on the proposed study and design included perceived importance of monitoring of adherence to oral chemotherapy, barriers to communication between patients and oncology teams regarding side effects and medication adherence, potential role of mobile apps to address barriers of quality of cancer care, potential feasibility, acceptability, and usage and feedback on the overall study design.
  1. Creation of Wireframes (like storyboards or page designs) and Collecting Initial Feedback:  The research and design team, in conjunction with stakeholder input, created content wireframes, or screen blueprints) to provide a visual guide as to what the app would look like.  These wireframes also served as basis for what the patient interviews would look like on the application.  A total of 10 MGH (Massachusetts General Hospital) patients (6 female, 4 male) and most with higher education (BS or higher) participated in the interviews and design of wireframes.  Eight MGH clinicians participated in this phase of wireframe design.
  1. Developing, Programming, and Refining the App:  CORA was designed to be supported by PHP/MySQL databases and run on LAMP hosts (Linux, Apache, MySQL, Perl/PHP/Python) and fully HIPAA compliant.  Alpha testing was conducted with various stakeholders and the app refined by the development team (technical team) after feedback.
  1. Final beta testing and App prototype for clinical trial: The research team considered the first 5 participants enrolled in the subsequent clinical trial for finalization of the app prototype.

There were 7 updated versions of the app during the initial clinical trial phase and 4 updates addressed technical issues related to smartphone operating system upgrades.

Finally, the investigators list a few limitations in their design and study of this application.  First the patient population was homogenous as all were from an academic hospital setting.   Second most of the patients were of Caucasian ethnic background and most were highly educated, all of which may introduce study bias.  In addition, CORA was available on smartphone and tablet only, so a larger patient population who either have no access to these devices or are not technically savvy may experience issues related to this limitation.

In addition other articles on this site related to Mobile Health applications and Health Outcomes include

Medical Applications and FDA regulation of Sensor-enabled Mobile Devices: Apple and the Digital Health Devices Market

How Social Media, Mobile Are Playing a Bigger Part in Healthcare

E-Medical Records Get A Mobile, Open-Sourced Overhaul By White House Health Design Challenge Winners

Qualcomm Ventures Qprize Regional Competition: MediSafe, an Israeli start-up in the personal health field, is the 2014 Winner of a $100,000 Prize

Friday, April 4 8:30 am- 9:30 am Science Track: Mobile Technology and 3D Printing: Technologies Gaining Traction in Biotech and Pharma – MassBio Annual Meeting 2014, Royal Sonesta Hotel, Cambridge, MA

Information Security and Privacy in Healthcare is part of the 2nd Annual Medical Informatics World, April 28-29, 2014, World Trade Center, Boston, MA

Post Acute Care – Driver of Variation in Healthcare Costs

Kaiser data network aims to improve cancer, heart disease outcomes

 

Additional references

  1. Aranda-Jan CB, Mohutsiwa-Dibe N, Loukanova S: Systematic review on what works, what does not work and why of implementation of mobile health (mHealth) projects in Africa. BMC public health 2014, 14:188.

 

 

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The Bioscience Crowdfunding Environment: Will Crowdfunding be the Bigger, New VC

Reporter: Stephen J. Williams, Ph.D.

Article ID #136: The Bioscience Crowdfunding Environment: The Bigger Better VC?. Published on 5/14/2014

WordCloud Image Produced by Adam Tubman

 

Pharmaceutical Consulting Consortium International Inc. (PCCI) recently presented their 7th annual Roundtable “CROWDFUNDING FOR LIFE SCIENCES: A BRIDGE OVER TROUBLED WATERS?”, a panel discussion on how this new funding mechanism applies to early stage life science companies and changes the funding landscape.

A major provision in the recently passed JOBS Act resulted in Securities & Exchange Commission (SEC) rule changes revolutionizing the way companies can raise capital, with some figures in the range of $11 trillion dollars. Companies, startups, and entrepreneurs can, in a manner, now go directly to the individual investor and raise capital. This method is generally referred to as CROWDFUNDING.

As explained by Mark Roderick, moderator for the meeting, there are two main types of approved crowdfunding:

  • Donation-based Crowdfunding – Popularized by the crowdfunding platform Kickstarter, this method of raising capital can accept small donations from anyone for an idea/project to be completed. The donor may either get a free token of appreciation or access to enjoy the fruits of the project, for example, a watching a movie funded by the donor. Some scientific researchers have used Kickstarter as a method to fund their research.
  • Investor-based Crowdfunding– This type of crowdfunding involves the actual transfer of securities, and investors must qualify according to rules set by the SEC and go thru brokers, or portals, like the bioscience and healthcare internet portal Poliwogg.

Investor-based crowdfundingwas discussed at the meeting.  There are five different mechanisms with this type of funding: Title II (Rule 506c), Title II, Title IV, Existing Regulation A, and Rule 504. The main focus of the meeting was on Title II as, according to Mr. Roderick, involves the mechanism most suited for biotech startups, while rules for Title III still need to be finalized.

Title II crowdfunding requires that “accredited” or “qualified” investors (those who make at least $200,000/year or net worth $1 million US) go through licensed dealer internet nodes (or Portals) like Poliwog. The Portal will have lists of startups they deem legitimate which investors can choose from. For instance the Epilepsy Foundation uses Poliwog to fund certain projects.

The panelists discussed matters including:

  • How crowdfunding is different than other mechanisms like venture capital
  • What are the regulations and financial responsibilities for both biotech and crowdfunder
  • Liabilities
  • Due-diligence issues

The panelists included:

  1. Mark Roderick, moderator. Mark is an attorney at Flaster/Greenberg PC (@CrowdfundAttny on Twitter) and has developed great experience and expertise in the details of crowdfunding. He maintains a Crowdfunding blog www.crowdfundattny.com, which contains information and links about the JOBS Act and crowdfunding.
  2. Barbara Schiberg, Managing Director at BioAdvance, a Mid-Atlantic bioangel investment community.
  3. Samuel Wertheimer, PhD, CIO Poliwogg, a crowdfunding internet portal.
  4. Darrick Mix, Partner, Duane Morris LLP, corporate lawyer with experience in the JOBS act
  5. Donlon Skerret, PCCI President and CEO of NanoScan Imaging and serial entrepreneur

The Opportunity

 

 crowdcrowdingoutVC

 

 

 

 

 

 

 

 

 

 

 

 

Recent estimates place Title II Crowdfunding capacity to $1 Trillion.

Venture Capital (VC) had estimated only $5 Billion bio-investment in 2013.

Where does the rest go?

 

Mr. Skerret noted that bioangels can only take you so far but thinks that crowdfunding may fill this “valley of death”.

Liabilities

 

Crowdfunding is SELLING SECURITIESso there is liability, disclosure and nondisclosure issues.

Title II contains 580 pages of regulations and SEC needs a licensed intermediary.

 

Due-Diligence

 

Barbara Schiberg also noted that with VCs or bioangels groups you also get s support network, basically their rolodex of contacts and KOL’s and experts. With Crowdfunding like Poliwog they just handle linking investors with entrepreneur. Any contact is done through social media and the crowd.

 

BioAdvance hires experts – may take months to years to get expert opinion

 

Poliwog only has responsibility to investor to make sure company is legitimate. They don’t do extensive due diligence like bioangels. Most crowdfunding do not have extensive networks of professionals.

 

 

To obtain a video recording of this meeting and get more information please go to PCCI’s web site at http://www.rxpcci.com/meetings.htm.

 

Other posts on this site related to FUNDING and Bio Investing include:

 

PCCI’s 7th Annual Roundtable “Crowdfunding for Life Sciences: A Bridge Over Troubled Waters?” May 12 2014 Embassy Suites Hotel, Chesterbrook PA 6:00-9:30 PM

10 heart-focused apps & devices are crowdfunding for American Heart Association’s open innovation challenge

Importance of Funding Replication Studies: NIH on Credibility of Basic Biomedical Studies

Partnerships & Funding

Updated: Investing and Inventing: Is the Tango of Mars and Venus Still on

Transforming Biotech & Pharma: LinkedIn is the Quiet Force by Timmerman

Technion-Cornell Innovation Institute in NYC: Postdocs keep exclusive license to their IP and take a fixed dollar amount of Equity if the researchers create a Spinoff company

 

 

 

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Leaders in Pharmaceutical Business Intelligence announce their latest addition to the BioMed e-Series ebooks: Cancer Biology and Genomics for Disease Diagnosis, Volume One.

This ebook is a compendium of recent breakthroughs, articles, and commentary on cancer research, cancer detection and diagnosis and treatment, written and curated by a team of PhD, MD, MD/PhD, PharmD clinicians, scientists, and writers having expertise in oncology.

Leaders in Pharmaceutical Business Intelligence will demonstrate this e-book at  The Sachs Cancer Bio Partnering and Investment Forum, held March 19, 2014 at the New York Academy of Sciences in New York, USA.

A post on this site entitled The 2nd ANNUAL Sachs Cancer Bio Partnering & Investment Forum Promoting Public & Private Sector Collaboration & Investment in Drug Development, 19th March 2014 • New York Academy of Sciences • USA explains the program, agenda, a description of this investment conference.

A flyer of the demonstration by Leaders in Pharmaceutical Intelligence is included below (please click on picture):

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The flyer can be downloaded as a .pdf here: SACHS FLYER 2014 CANCER EBOOK

April 2014 will see LAUNCH of next VOLUME in Series C: e-Books on Cancer & Oncology Radiation Oncology & Immunotherapy in Cancer

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Liver Toxicity halts Clinical Trial of IAP Antagonist for Advanced Solid Tumors

Curator: Stephen J. Williams, Ph.D.

UPDATED 8/12/2022

Athough not related to IAP Antagonists this update does report 2 deaths from IDILI or idiosynchratic drug induced liver injury from a gene therapy trial using an AAV (adeno associated virus) targeting the disease spinal muscular atrophy.  Please see below after reading about IDILI.

 

A recent press release on FierceBiotech reported the FDA had put a halt on a phase 1 study for advanced refractory solid tumors and lymphomas of Curis Inc. oral inhibitor of apoptosis (IAP) antagonist CUDC-427.  The FDA placed the trial on partial clinical hold following reports of a death of a patient from severe liver failure.  The single-agent, dose escalation Phase 1 study was designed to determine the maximum tolerated dose and recommended doses for a Phase 2 trial. The press release can be found at:

http://www.fiercebiotech.com/press-releases/curis-reports-third-quarter-2013-financial-results-and-provides-cudc-427-de.

According to the report one patient with breast cancer that had metastasized to liver, lungs, bone, and ovaries developed severe hepatotoxicity as evidenced by elevated serum transaminase activities (AST and ALT) and hyper-billirubinemia.  Serum liver enzyme activities did not attenuate upon discontinuation of CUDC-427.  This was unlike prior experience to the CUDC-427 drug, in which decreased hepatic function was reversed upon drug discontinuation.  The patient died from liver failure one month after discontinuation of CUDC-427.

It was noted that no other patient had experienced such a serious, irreversible liver dysfunction.

Although any incidence of hepatotoxicity can be cause for concern, the incidence of IDIOSYNCRATIC IRREVERSIBLE HEPATOTOXICITY warrants a higher scrutiny.

Four general concepts can explain toxicity profiles and divergences between individuals:

  1. Toxicogenomics: Small differences in the genetic makeup between individuals (such as polymorphisms (SNP) could result in differences in toxicity profile for a drug.  This ais a serious possibility as only one patient presented with such irreversible liver damage
  2. Toxicodynamics:  The toxicologic effect is an extension of the pharmacologic mechanism of action (or  lack thereof: could there have been alternate signaling pathways activated in this patient or noncanonical mechanism)
  3. Toxicokinetic:  The differences in toxicological response due to differences in absorption, distribution, metabolism, excretion etc. (kinetic parameters)
  4. Idiosyncratic: etiology is unknown; usually a minority of adverse effects

 

Since there is not enough information to investigate toxicogenomic or toxicokinetic mechanisms for this compound, the rest of this post will investigate the possible mechanisms of hepatotoxicity due to IAP antagonists and clues from other clinical trials which might shed light on a mechanism of toxicity (toxicodynamic) or idiosyncratic events.

Therefore this post curates the current understanding of drug-induced liver injury (DILI), especially focusing on a type of liver injury referred to as idiosyncratic drug-induced liver injury (IDILI) in the context of:

  1. Targeted and newer chemotherapies such as IAP antagonists
  2. Current concepts of mechanisms of IDILI including:

i)        Inflammatory responses provoked by presence of disease

ii)      Cellular stresses, provoked by disease, uncovering NONCANONICAL toxicity pathways

iii)    Pharmacogenomics risk factors of IDILI

Eventually this post aims to stimulate the discussion: 

  • Given inflammation, genetic risk factors, and cellular stresses (seen in clinical setting) have been implicated in idiosyncratic drug-induced liver injury from targeted therapies, should preclinical hepatotoxicity studies also be conducted in the presence of the metastatic disease?
  • Does inflammation and cellular stress from clinical disease unmask NONCANONICAL pharmacologic and/or toxicological mechanisms of action?

Classification of types of Cellular Liver injury:  A listing of types of cellular injury is given for review

I.     Hepatic damage after Acute Exposure

A. Cytotoxic (Necrotic):  irreversible cell death characterized by loss of cell membrane integrity, intracellular swelling, nuclear shrinkage (pyknosis) and eventual cytoplasmic breakdown of nuclear DNA (either by a process known as karyolysis or karyorhexus) localized inflammation as a result of release of cellular constituents.  Intracellular ATP levels are commonly seen in necrotic death.  Necrosis, unlike apoptosis, does not require a source of ATP.  A nice review by Yoshihide Tsujimoto describing and showing (by microscopy) the  differences between apoptosis and necrosis can be found here.

B. Cholestatic:  hepatobiliary dysfunction with bile stasis and accumulation of bile salts.  Cholestatic injury can result in lipid (particularly cholesterol) accumulation in cannicular membranes resulting in decreased permeability of the membrane, hyperbillirubinemia and is generally thought to result in metabolic defects.

C. Lipid Peroxidation: free radical generation producing peroxide of cellular lipids, generally resulting in a cytotoxic cell death

II.     Hepatic damage after Chronic Exposure

A. Chirrotic: Chronic morphologic alteration of the liver characterized by the presence of septae of collagen distributed throughout the major portion of the liver; Forms fibrous sheaths altering hepatic blood flow, resulting in a necrotic process with scar tissue; Alteration of hepatic metabolic systems.

B. Carcinogenesis

III. Idiosyncratic Drug Induced Liver Injury

The aforementioned mechanisms of hepatotoxicity are commonly referred to as the “intrinsic” (or end target-organ) toxicity mechanisms.  Idiosyncratic drug-induced liver injury (IDILI) is not well understood but can be separated into allergic and nonallergic reactions.  Although the risk of acute liver failure associated with idiosyncratic hepatotoxins is low (about 1 in ten thousand patients) there are more than 1,000 drugs and herbal products associated with this type of toxic reaction. Idiosyncratic drug induced liver failure usually gets a black box warning from the FDA. Idiosyncratic drug-induced liver injury differs from “intrinsic” toxicity in that IDILI:

  • Happens in a minority of patients (susceptible patients)
  • Not reproducible in animal models
  • Not dose-dependent
  • Variable time of onset
  • Variable liver pathology (not distinctive lesions)
  • Not related to drug’s pharmacologic mechanism of action (trovafloxacin IDILI vs. levofloxacin)

A great review in Perspectives in Pharmacology written by Robert Roth and Patricia Ganey at Michigan State University explains these differences between intrinsic and idiosyncratic drug-induced hepatotoxicity[1] (however authors do note that there are many similarities between the two mechanisms).    It is felt that drug sensitivity (allergic) and inflammatory responses (nonallergic) may contribute to the occurrence of IDILI.  For instance lipopolysaccharide (LPS) form bacteria can potentiate acetaminophen toxicity.  In fact animal models of IDILI have been somewhat successful:

  • co-treatment of rats and mice with nontoxic doses of trovafloxacin (casues IDILI in humans) and LPS resulted in marked hepatotoxicity while no hepatotoxicity seen with levofloxacin plus LPS[2]
  • correlates well with incidence of human IDILI (adapted from a review Inflammatory Stress and Idiosyncratic Hepatotoxicity: Hints from Animal Models (in Pharmacology Reviews)[3].  Idiosyncratic injury damage has been reported for diclofenac, halothane, and sulinac.  These drugs also show hepatotoxicity in the LPS model for IDILI.
  • Roth and Ganey suggest the reason why idiosyncratic hepatotoxicity is not seen  in most acute animal toxicity studies is that, in absence of stress/inflammation  IDILI occurrence is masked by lethality but stress/inflammation shifts increases sensitivity to liver injury at a point before lethality is seen

IDILdosestressrossmantheory

Figure.  Idiosyncratic toxic responses of the liver.    In the absence of stress and/or genetic factors, drug exposure may result in an idiosyncratic liver injury (IDILI) at a point (or dose) beyond the therapeutic range and lethal exposure for that drug.  Preclinical studies, usually conducted at sublethal doses, would not detect DILI .  Stress and/or genetic factors sensitize the liver to toxic effects of the drug (synergism) and DILI is detected at exposure levels closer to therapeutic range.  Note IDILI is not necessarily dose-dependent but cellular stress (like ROS or inflammation) may expose NONCANONICAL mechanisms of drug action or toxicity which result in IDILI. Model adapted from Roth and Ganey.

What Stress factors contribute to IDILI?

Various stresses including inflammation from bacterial, viral infections ,inflammatory cytokines  and stress from reactive oxygen (ROS) have been suggested as mechanisms for IDILI.

  1. Inflammation/Cytokines (also discussed in other sections of this post):  Inflammation has long been associated with human cases of DILI.    Many cytokines and inflammatory mediators have been implicated including TNFα, IL7, TGFβ, and IFNϒ (viral infection) leading some to conclude that serum measurement of cytokines could be a potential biomarker for DILI[4].  In addition, ROS (see below) is generated from inflammation and also considered a risk factor for DILI[5].
  2. Reactive Oxygen (ROS)/Reactive Metabolites: Oxidative stress, either generated from reactive drug metabolites or from mitochondrial sources, has been shown to be involved in apoptotic and necrotic cell death.  Both alterations in the enzymes involved in the generation of and protection from ROS have been implicated in increased risk to DILI including (as discussed further) alterations in mitochondrial superoxide dismutase 2 (SOD2) and glutathione S-transferases.  Both ROS and inflammatory cytokines can promote JNK signaling, which has been implicated in DILI[6].

Dr. Neil Kaplowitz suggested that we:

“develop a unifying hypothesis that involves underlying genetic or acquired mitochondrial abnormalities as a major determinant of susceptibility for a number of drugs that target mitochondria and cause DILI. The mitochondrial hypothesis, implying gradually accumulating and initially silent mitochondrial injury in heteroplasmic cells which reaches a critical threshold and abruptly triggers liver injury, is consistent with the findings that typically idiosyncratic DILI is delayed (by weeks or months), that increasing age and female gender are risk factors and that these drugs are targeted to the liver and clearly exhibit a mitochondrial hazard in vitro and in vivo. New animal models (e.g., the Sod2(+/-) mouse) provide supporting evidence for this concept. However, genetic analyses of DILI patient samples are needed to ultimately provide the proof-of-concept”[7].

Clin Infect Dis. 2004 Mar 38(Supplement 2) S44-8, Figure 1

Clin Infect Dis. 2004 Mar 38(Supplement 2) S44-8, Figure 3

Figures. Mechanisms of Drug-Induced Liver Injury and Factors related to the occurrence of  DILI (used with permission from Oxford Press; reference [7])

To this end, Dr. Brett Howell and other colleagues at the Hamner-UNC Institute for Drug Safety Sciences (IDSS) developed an in-silico model of DILI ( the DILISym™ model)which is based on  depletion of cellular ATP and reactive metabolite formation as indices of DILI.

Have there been Genetic Risk Factors identified for DILI?

Candidate-gene-associated studies (CGAS) have been able to identify several genetic risk factors for DILI including:

  1. Uridine Diphosphate Glucuronosyltransferase 2B7 (UGT2B7): variant increased susceptibility to diclofenac-induced DILI
  2. Adenosine triphosphate-binding cassette C2 (ABCC2) variant ABCC-24CT increased susceptibility to diclofenac-induced DILI
  3. Glutathione S-transferase (GSTT1): patients with a double GSTT1-GSTM1 null genotype had a significant 2.7 fold increased risk of DILI from nonsteroidal anti-inlammatory agents, troglitazone and tacrine.  GSTs are involved in the detoxification of phase 1 metabolites and also protect against cellular ROS.

Although these CGAS confirmed these genetic risk factors,  Stefan Russman suggests a priori genome-wide association studies (GWAS) might provide a more complete picture of genetic risk factors for DILI as CGAS is limited due to

  1. Candidate genes are selected based on current mechanisms and knowledge of DILI so genetic variants with no known knowledge of or mechanistic information would not be detected
  2. Many CGAS rely on analysis of a limited number of SNP and did not consider intronic regions which may control gene expression

A priori GWAS have the advantage of being hypothesis-free, and although they may produce a high number of false-positives, new studies of genetic risk factors of ximelagatran, flucioxaciliin and diclofenac-induced liver injury are using a hybrid approach which combines the whole genome and unbiased benefits of GWAS with the confirmatory and rational design of CGAS[8-10].

Even though idiosyncratic DILI is rare, the severity, unpredictable onset, and unknown etiology and risk factors have prompted investigators such as Stefan Russmann from University Hospital Zurich and Ignazio Grattagliano from University of Bari to suggest:

Identification of risk factors for rare idiosyncratic hepatotoxicity requires special networks that contribute to data collection and subsequent identification of environmental as well as genetic risk factors for clinical cases of idiosyncratic DILI[11].

Therefore, a DILI network project (DILIN) had been developed to collect samples and detailed genetic and clinical data on IDILI cases from multiple medical centers.  The project aims to identify the upstream and downstream genetic risk factors for IDILI[12].  Please see a SlideShare presentation here of the goals of the DILI network project.

Drs Colin Spraggs and Christine Hunt had reviewed possible genetic risk factors of DILI seen with various tyrosine kinase inhibitors (TKIs) including Lapatinib (Tykerb/Tyverb©, a dual inhibitor of  HER2/EGFR heterodimer) and paopanib (Votrient©; a TKI that targets VEGFR1,2,3 and PDGFRs)[13].

From a compilation of studies:

  • Elevation in serum bilirubin during treatment with lapatinib and pazopanib are associated with UGT1A1 polymorphism related to Gilbert’s syndrome (a clinically benign syndrome)
  • Anecdotal evidence shows that polymorphisms of lapatinib and pazopanib metabolizing enzymes may contribute to differences seen in onset of DILI
  • Pazopanib-induced elevations of ALT correlate with HFE variants, suggesting alterations in iron transport may predispose to DILI
  • Strong correlations between lapatinib-induced DILI and class II HLA locus suggest inflammatory stress response important in DILI

Note that these clinical findings were not evident from the preclinical tox studies. According to the European Medicines Agency assessment report for Tykerb states: “the major findings in repeat dose toxicity studies were attributed to lapatinib pharmacology (epithelial effect in skin and GI system.  The toxic events occurred at exposures close to the human exposure at the recommended dose.  Repeat-dose toxicity studies did not reveal important safety concerns than what would be expected from the mode of action”.

However, it should be noted that in high dose repeat studies in mice and rats, severe lethality was seen with hematologic, gastrointestinal toxicities in combination with altered blood chemistry parameters and yellowing of internal organs.

IAP Antagonists, Mechanism of Action, and Clinical Trials:

A few IAP antagonists which are in early stage development include:

  • Norvatis IAP Inhibitor LCL161: at 2012 San Antonia Breast Cancer Symposium, a phase 1 trial in triple negative breast cancer showed promising results when given in combination with paclitaxel.
  • Ascenta Therapeutics IAP inhibitor AT-406 in phase 1 in collaboration with Debiopharm S.A. showed antitumor efficacy in xenograft models of breast, pancreatic, prostate and lung cancer. The development of this compound is described in a paper by Cai et. al.

National Cancer Institute sponsored trials using antagonists of IAPs include

  • Phase II Study of Birinapant for Advanced Ovarian, Fallopian Tube, and Peritoneal Cancer (NCI-12-C-0191). Principle Investigator: Dr. Christina Annunziata. See the protocol summary. More open trials for this drug are located here.  Closed trials including safety studies can be found here.
  • A Phase 1 non-randomized dose escalation study to determine maximum tolerated dose (MTD) and characterize the safety for the TetraLogic compound TL32711 had just been completed. Results have not been published yet.
  • Closed Clinical trials with the IAP antagonist HGS1029 in advanced solid tumors determined that weekly i.v. administration of HGS1029 reported a safety issue for primary outcome measures

A great review on IAP proteins and their role as regulators of apoptosis and potential targets for cancer therapy [14] can be found as a part of a Special Issue in Experimental Oncology “Apoptosis: Four Decades Later”.  Human IAPs (inhibitors of apoptosis) consist of eight proteins involved in cell death, immunity, inflammation, cell cycle, and migration including:

In general, IAP proteins are directly involved in inhibiting apoptosis by binding and directly inhibiting the effector cysteine protease caspases (caspase 3/7) ultimately responsible for the apoptotic process [15].  IAPs were actually first identified in baculoviral genomes because of their ability to suppress host-cell death responses during viral infection [16]. IAP proteins are often overexpressed in cancers [17].

Apoptosis is separated into two pathways, defined by the initial stress or death signal and the caspases involved:

  1. Extrinsic pathway: initiated by TNFα and death ligand FasLigand;  involves caspase-8; process inhibited by IAP1/2
  2. Intrinsic pathway: initiated by DNA damage, irradiation, chemotherapeutics; mitochondrial pathway involving caspase 9 and cytochrome c release from mitochondria; mitochondria also releases SMAC/DIABLO, which binds and inhibits XIAP (XIAP inhibits the Intrinsic apoptotic pathway.

 intrinsicextrinsicapoptosiswikidot

 

Intrinsic and Extrinsic pathways of apoptosis. Figure photocredit (wikidot.com)

The Curis IAP antagonist (and others) is a SMAC small molecule mimetic. It is interesting to note [18, 19] that IAP antagonists can result in death by

  • Apoptosis: an IAP antagonist in presence of competent TNFα signaling
  • Necrosis: seen with IAP inhibitors in cells with altered TNFα signaling or with presence of caspase inhibitors

IAPs are also involved in the regulation of signaling pathways such as:

NF-ΚB signaling pathway

NF-ΚB is a “rapid-acting” transcription factor which has been found to be overexpressed in various cancers.  Under most circumstances NF-ΚB translocation to the nucleus results in transcription of genes related to cell proliferation and survival.  NF-ΚB signaling is broken down in two pathways

  1. Canonical:  Canonical pathway can be initiated (for example in inflammation) when TNF-α binds its receptors activating  death domains (TRADD)
  2. Noncanonical: since requires new protein synthesis takes longer than canonical signaling.  Can be initiated by other TNF like ligands like CD40

IAP1/2 is a negative regulator of the noncanonical NF-ΚB signaling pathway by promoting proteosomal degradation of the TRAF signaling complex. A wonderfully annotated list of NF-ΚB target genes can be found on the Thomas Gilmore lab site at Boston University at http://www.bu.edu/nf-kb/gene-resources/target-genes/ .

NF-ΚB has been considered a possible target for chemotherapeutic development however Drs. Veronique Baud and Michael Karin have pondered the utility of IAP antagonists as a good target in their review: Is NF-ΚB a good target for cancer therapy?: Hopes and pitfalls [20].  The authors discuss issues such that IAP antagonism induced both the classical and noncanonical NF-ΚB pathway thru NIK stabilization, resulting in stabilization of NF-ΚB signaling and thereby undoing any chemotherapeutic effect which would be desired.

AKT signaling

IAPs have been shown to interact with other proteins including a report that SIAP regulates AKT activity and caspase-3-dependent cleavage during cisplatin-induced apoptosis in human ovarian cancer cells and could be another mechanism involved in cisplatin resistance[21].   In addition there have been reports that IAPs can regulate JNK and MAPK signaling.

Therefore, IAPs are involved in CANONICAL and NONCANONICAL pathways.

IAPs can Regulate Pro-Inflammatory Cytokines

A recent 2013 JBC paper [22]showed that IAPs and their antagonists can regulate spontaneous and TNF-induced proinflammatory cytokine and chemokine production and release

  • IAP required for production of multiple TNF-induced proinflammatory mediators
  • IAP antagonism decreased TNF-mediated production of chemokines and cytokines
  • But increased spontaneous release of chemokines

In addition Rume Damgaard and Mads Gynd-Hansen have suggested that IAP antagonists may be useful in treating inflammatory diseases like Crohn’s disease as IAPs regulate innate and acquired immune responses[23].

Toxicity profiles of IAP antagonists

NOTE: In a paper in Toxicological Science from 2012[24], Rebecca Ida Erickson form Genentech reported on the toxicity profile of the IAP antagonist GDC-0152 from a study performed in dogs and rats. A dose-dependent toxicity profile from i.v. administration was consistent with TNFα-mediated toxicity with

  • Elevated plasma cytokines and an inflammatory leukogram
  • Increased serum transaminases
  • Inflammatory infiltrate and apoptosis/necrosis in multiple tissues

In a related note, a similar type of fatal idiosyncratic hepatotoxicity was reported in a 62 year-old man treated with the Raf kinase inhibitor sorafenib for renal cell carcinoma[25]: Fatal case of sorafenib-associated idiosyncratic hepatotoxicity in the adjuvant treatment of a patient with renal cell carcinoma; Case Report  in BMC Cancer.

At week four after initiation of sorafenib treatment, the patient noticed increasing fatigue, malaise, gastrointestinal discomfort and abdominal rash.  Although treatment was discontinued, jaundice developed and blood test revealed an acute hepatitis with

  • Elevated serum ALT
  • Elevated serum alkaline phosphatase
  • Increased prothrombin time
  • Increased LDH

…elevated levels seen in the case with the aforementioned IAP antagonist.  Autopsy revealed

  • Lobular hepatitis
  • Mononuclear cell infiltrate
  • Hepatocyte necrosis

These findings are in line with a drug-induced inflammation and IDILI. In addition to hepatotoxicity, renal insufficiency developed in this patient. The authors had suggested the death was probably due to “an idiosyncratic allergic reaction to sorafenib manifesting as hepatotoxicity with associated renal impairment”.  The authors also noted that genome wide association studies of idiosyncratic drug-induced liver injury support involvement of major histocompatibility complex (MHC) polymorphisms[26].  MHC involvement has also been associated with lapatanib and pazopanib hepatotoxicity [27, 28].

Curis has been involved in another novel oncology therapeutic, a first in class.

Last year Roche and Genentech had won approval for a Hedgehog pathway inhibitor vismodegib for treatment of advanced basal cell carcinoma (reported at FierceBiotech©). Vismodegib was initially developed in collaboration with Curis, Inc.  The hedgehog signaling pathway, which controls the function of Gli factors (involved in stem cell differentiation), is overactive in advanced basal cell carcinoma as well as other cancer types.

As an additional reference, the FDA National Center for Toxicological Research has developed THE LIVER TOXICITY KNOWLEDGE BASE (LTKB).

“The LTKB is a project designed to study drug-induced liver injury (DILI). Liver toxicity is the most common cause for the discontinuation of clinical trials on a drug, as well as the most common reason for an approved drug’s withdrawal from the marketplace. Because of this, DILI has been identified by the FDA’s Critical Path Initiatives as a key area of focus in a concerted effort to broaden the agency’s knowledge for better evaluation tools and safety biomarkers.”

A nice SlideShow of Toxicity of Targeted Therapies can be found here: http://www.slideshare.net/RashaHaggag/toxicities-of-targeted-therapies

Also please note that ALL GENES in this article are linked to their GENECARD 

UPDATED 8/12/2022

 

Zolgensma Gene Therapy Linked to 2 Deaths in SMA Patients, Novartis Reports

The 2 deaths, due to acute liver failure, occurred in patients treated in Kazakhstan and Russia.

Two children with spinal muscular atrophy (SMA) have died after being treated with onasemnogene abeparvovec (Zolgensma; Novartis) from acute liver failure, a known safety risk of the therapy.1

Novartis has updated the FDA and other regulatory agencies in countries that Zolgensma is approved in, including Russia and Kazakhstan, where the deaths occurred. The company will also update the labeling of Zolgensma to include the deaths.

“While this is important safety information, it is not a new safety signal and we firmly believe in the overall favorable risk/benefit profile of Zolgensma, which to date has been used to treat more than 2300 patients worldwide across clinical trials, managed access programs, and in the commercial setting,” Novartis said in an emailed statement to BioPharma Dive.2

Zolgensma’s labeling includes the risk of liver injury and instructs clinicians to assess liver function before treatment and to manage liver enzyme counts with steroid treatment. The 2 deaths occurred 5 to 6 weeks after the one-time infusion and 1 to 10 days after corticosteroid treatment was tapered, according to an initial report from Stat News.1

READ MORE: Zolgensma Shows Efficacy in SMA With 3 SMN2 Copies

An FDA advisory committee meeting that took place last fall identified risks of adeno associated virus (AAV) gene therapies including, specifically, Zolgensma.2 The committee recommended caution, but nothing that would hinder gene therapy development.

Zolgensma, which was approved in the US in May 2019, just recently demonstrated further positive data from SPR1NT (NCT03505099), a phase 3 multicenter, single-arm trial on its effect in presymptomatic children with SMA in 2 articles published in Nature Medicine.3,4

All children in both the type 1 and type 2 cohorts achieved the ability to independently sit and most achieved other age-appropriate milestones including standing and walking. None of the children in the study required respiratory support or nutritional support, and there were no serious treatment-related adverse events observed.

“The robust data from both the 2- and 3-copy SPR1NT cohorts are being published together for the first time, further supporting the significant and clinically meaningful benefit of Zolgensma in presymptomatic babies with SMA,” Shephard Mpofu, MD, SVP, chief medical officer, Novartis Gene Therapies, said in a previous statement.5 “When treated with Zolgensma prior to the onset of symptoms, not only did all 29 patients enrolled in SPR1NT survive, but were thriving—breathing and eating on their own, with most even sitting, standing, and walking without assistance.”

REFERENCE

1. Silverman E. Novartis reports two children died from acute liver failure after treatment with Zolgensma gene therapy. STAT. August 11, 2022. https://www.statnews.com/pharmalot/2022/08/11/novartis-zolgensma-liver-failure-gene-therapy-death/

2. Pagliarulo N. Novartis reports deaths of two patients treated with Zolgensma gene therapy. BioPharma Dive. August 12, 2022. https://www.biopharmadive.com/news/novartis-zolgensma-patient-death-liver-injury/629542/

3. Strauss KA, Farrar MA, Muntoni F, et al. Onasemnogeneabeparvovec for presymptomatic infants with two copies of SMN2 at risk for spinal muscular atrophy type 1: the Phase III SPR1NT trial. Nat Med. Published online June 17, 2022. doi:10.1038/s41591-022-01866-42

4. Strauss KA, Farrar MA, Muntoni F, et al. Onasemnogeneabeparvovec for presymptomatic infants with three copies of SMN2 at risk for spinal muscular atrophy: the Phase III SPR1NT trial. Nat Med. Published online June 17, 2022.doi: 10.1038/s41591-022-01867-3

5. Novartis announces Nature Medicine publication of Zolgensma data demonstrating age-appropriate milestones when treating children with SMA presymptomatically. News release. Novartis. June 17, 2022. https://firstwordpharma.com/story/5597735

 

REFERENCES

1.            Roth RA, Ganey PE: Intrinsic versus idiosyncratic drug-induced hepatotoxicity–two villains or one? The Journal of pharmacology and experimental therapeutics 2010, 332(3):692-697.

2.            Waring JF, Liguori MJ, Luyendyk JP, Maddox JF, Ganey PE, Stachlewitz RF, North C, Blomme EA, Roth RA: Microarray analysis of lipopolysaccharide potentiation of trovafloxacin-induced liver injury in rats suggests a role for proinflammatory chemokines and neutrophils. The Journal of pharmacology and experimental therapeutics 2006, 316(3):1080-1087.

3.            Deng X, Luyendyk JP, Ganey PE, Roth RA: Inflammatory stress and idiosyncratic hepatotoxicity: hints from animal models. Pharmacological reviews 2009, 61(3):262-282.

4.            Laverty HG, Antoine DJ, Benson C, Chaponda M, Williams D, Kevin Park B: The potential of cytokines as safety biomarkers for drug-induced liver injury. European journal of clinical pharmacology 2010, 66(10):961-976.

5.            Schwabe RF, Brenner DA: Mechanisms of Liver Injury. I. TNF-alpha-induced liver injury: role of IKK, JNK, and ROS pathways. American journal of physiology Gastrointestinal and liver physiology 2006, 290(4):G583-589.

6.            Seki E, Brenner DA, Karin M: A liver full of JNK: signaling in regulation of cell function and disease pathogenesis, and clinical approaches. Gastroenterology 2012, 143(2):307-320.

7.            Kaplowitz N: Drug-induced liver injury. Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2004, 38 Suppl 2:S44-48.

8.            Kindmark A, Jawaid A, Harbron CG, Barratt BJ, Bengtsson OF, Andersson TB, Carlsson S, Cederbrant KE, Gibson NJ, Armstrong M et al: Genome-wide pharmacogenetic investigation of a hepatic adverse event without clinical signs of immunopathology suggests an underlying immune pathogenesis. The pharmacogenomics journal 2008, 8(3):186-195.

9.            Aithal GP, Ramsay L, Daly AK, Sonchit N, Leathart JB, Alexander G, Kenna JG, Caldwell J, Day CP: Hepatic adducts, circulating antibodies, and cytokine polymorphisms in patients with diclofenac hepatotoxicity. Hepatology 2004, 39(5):1430-1440.

10.          Daly AK, Aithal GP, Leathart JB, Swainsbury RA, Dang TS, Day CP: Genetic susceptibility to diclofenac-induced hepatotoxicity: contribution of UGT2B7, CYP2C8, and ABCC2 genotypes. Gastroenterology 2007, 132(1):272-281.

11.          Russmann S, Kullak-Ublick GA, Grattagliano I: Current concepts of mechanisms in drug-induced hepatotoxicity. Current medicinal chemistry 2009, 16(23):3041-3053.

12.          Fontana RJ, Watkins PB, Bonkovsky HL, Chalasani N, Davern T, Serrano J, Rochon J: Drug-Induced Liver Injury Network (DILIN) prospective study: rationale, design and conduct. Drug safety : an international journal of medical toxicology and drug experience 2009, 32(1):55-68.

13.          Spraggs CF, Xu CF, Hunt CM: Genetic characterization to improve interpretation and clinical management of hepatotoxicity caused by tyrosine kinase inhibitors. Pharmacogenomics 2013, 14(5):541-554.

14.          de Almagro MC, Vucic D: The inhibitor of apoptosis (IAP) proteins are critical regulators of signaling pathways and targets for anti-cancer therapy. Experimental oncology 2012, 34(3):200-211.

15.          Deveraux QL, Takahashi R, Salvesen GS, Reed JC: X-linked IAP is a direct inhibitor of cell-death proteases. Nature 1997, 388(6639):300-304.

16.          Crook NE, Clem RJ, Miller LK: An apoptosis-inhibiting baculovirus gene with a zinc finger-like motif. Journal of virology 1993, 67(4):2168-2174.

17.          Tamm I, Kornblau SM, Segall H, Krajewski S, Welsh K, Kitada S, Scudiero DA, Tudor G, Qui YH, Monks A et al: Expression and prognostic significance of IAP-family genes in human cancers and myeloid leukemias. Clinical cancer research : an official journal of the American Association for Cancer Research 2000, 6(5):1796-1803.

18.          Laukens B, Jennewein C, Schenk B, Vanlangenakker N, Schier A, Cristofanon S, Zobel K, Deshayes K, Vucic D, Jeremias I et al: Smac mimetic bypasses apoptosis resistance in FADD- or caspase-8-deficient cells by priming for tumor necrosis factor alpha-induced necroptosis. Neoplasia 2011, 13(10):971-979.

19.          He S, Wang L, Miao L, Wang T, Du F, Zhao L, Wang X: Receptor interacting protein kinase-3 determines cellular necrotic response to TNF-alpha. Cell 2009, 137(6):1100-1111.

20.          Baud V, Karin M: Is NF-kappaB a good target for cancer therapy? Hopes and pitfalls. Nature reviews Drug discovery 2009, 8(1):33-40.

21.          Asselin E, Mills GB, Tsang BK: XIAP regulates Akt activity and caspase-3-dependent cleavage during cisplatin-induced apoptosis in human ovarian epithelial cancer cells. Cancer research 2001, 61(5):1862-1868.

22.          Kearney CJ, Sheridan C, Cullen SP, Tynan GA, Logue SE, Afonina IS, Vucic D, Lavelle EC, Martin SJ: Inhibitor of apoptosis proteins (IAPs) and their antagonists regulate spontaneous and tumor necrosis factor (TNF)-induced proinflammatory cytokine and chemokine production. The Journal of biological chemistry 2013, 288(7):4878-4890.

23.          Damgaard RB, Gyrd-Hansen M: Inhibitor of apoptosis (IAP) proteins in regulation of inflammation and innate immunity. Discovery medicine 2011, 11(58):221-231.

24.          Erickson RI, Tarrant J, Cain G, Lewin-Koh SC, Dybdal N, Wong H, Blackwood E, West K, Steigerwalt R, Mamounas M et al: Toxicity profile of small-molecule IAP antagonist GDC-0152 is linked to TNF-alpha pharmacology. Toxicological sciences : an official journal of the Society of Toxicology 2013, 131(1):247-258.

25.          Fairfax BP, Pratap S, Roberts IS, Collier J, Kaplan R, Meade AM, Ritchie AW, Eisen T, Macaulay VM, Protheroe A: Fatal case of sorafenib-associated idiosyncratic hepatotoxicity in the adjuvant treatment of a patient with renal cell carcinoma. BMC cancer 2012, 12:590.

26.          Daly AK: Drug-induced liver injury: past, present and future. Pharmacogenomics 2010, 11(5):607-611.

27.          Spraggs CF, Budde LR, Briley LP, Bing N, Cox CJ, King KS, Whittaker JC, Mooser VE, Preston AJ, Stein SH et al: HLA-DQA1*02:01 is a major risk factor for lapatinib-induced hepatotoxicity in women with advanced breast cancer. Journal of clinical oncology : official journal of the American Society of Clinical Oncology 2011, 29(6):667-673.

28.          Xu CF, Reck BH, Goodman VL, Xue Z, Huang L, Barnes MR, Koshy B, Spraggs CF, Mooser VE, Cardon LR et al: Association of the hemochromatosis gene with pazopanib-induced transaminase elevation in renal cell carcinoma. Journal of hepatology 2011, 54(6):1237-1243.

Other articles on the site about Toxicology and Pharmacology of New Classes of Cancer Chemotherapy include:

FDA Guidelines For Developmental and Reproductive Toxicology (DART) Studies for Small Molecules

Gamma Linolenic Acid (GLA) as a Therapeutic tool in the Management of Glioblastoma

DNA Methultransferases – Implications to Epigenetic Regulation and Cancer Therapy Targeting: James Shen, PhD

Molecular Profiling in Cancer Immunotherapy: Debraj GuhaThakurta, PhD

AT13148 – A Novel Oral Multi-AGC Kinase Inhibitor Has Potent Antitumor Activity

Targeting Mitochondrial-bound Hexokinase for Cancer Therapy

Breast Cancer, drug resistance, and biopharmaceutical targets

Ubiquitin-Proteosome pathway, Autophagy, the Mitochondrion, Proteolysis and Cell Apoptosis: Part III

Ubiquinin-Proteosome pathway, autophagy, the mitochondrion, proteolysis and cell apoptosis

Read Full Post »

Heroes in Medical Research: Dr. Carmine Paul Bianchi Pharmacologist, Leader, and Mentor

Writer/Curator: Stephen J. Williams, Ph.D.

Article ID #83: Heroes in Medical Research: Dr. Carmine Paul Bianchi Pharmacologist, Leader, and Mentor. Published on 10/29/2013

WordCloud Image Produced by Adam Tubman

Past articles in this Heroes in Medical Research series had focused on those seemingly small discoveries, sometimes gained serendipitously and through careful observation and experimentation, which led to some of our most important breakthroughs of our time.  I have tried to make the posts more about the people and less about the discoveries

However, though seminal discoveries are so important to the future of science (and should be celebrated), equally if not MORE IMPORTANT is the MENTORING of future scientists and the PROMOTION of fields of study.  One person who exemplified these values was Dr. Carmine Paul Bianchi, who had recently just passed away this August, and will be sorely missed in the field of pharmacology and toxicology.

For those who were not familiar with Dr. Bianchi I have curated some pertinent information about his work as a scientist, professor and Chairman in pharmacology, and leader and spokesperson for the field of pharmacology.  He was one of the founders of the Mid-Atlantic Pharmacology Society and was an advocate and influential in the careers of many pharmacologists and toxicologists.

Comments from fellow colleagues are very welcome (in comment section at end of post)

The following is separated in 3 sections:

  • An obituary from the Philadelphia Inquirer
  •  A section of the history of the Pharmacology Department at Thomas Jefferson University where Dr. Bianchi was Chairman
  • A few important textbooks and scientific articles he had authored

 

Carmine Paul Bianchi, 86, pharmacology professor

Paul Bianchi

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Carmine Paul Bianchi

By Bonnie L. Cook, Inquirer Staff Writer

Posted: August 20, 2013

Carmine Paul Bianchi, 86, of Boothwyn, a professor of pharmacology in Philadelphia for many years, died Tuesday, Aug. 13, of a digestive ailment at Taylor Hospice House in Ridley Park.

Born in Newark, N.J., and raised in Maplewood, Dr. Bianchi served as an Army surgical technician in Tilton General Hospital at Fort Dix from 1945 to 1947.

He earned a bachelor’s degree in chemistry from Columbia University in 1950, a master’s in physiology and biochemistry from Rutgers University in 1953, and a doctorate in physiology and physical chemistry in 1956 from Rutgers.

In the 1950s, he did research at Rutgers and was a public health fellow and visiting scientist at the National Institutes of Health in Maryland.

From 1961 to 1976, he held a number of jobs in the department of pharmacology in the University of Pennsylvania School of Medicine. That culminated in his being named professor of pharmacology.

Dr. Bianchi left in 1976 for Jefferson Medical College of Thomas Jefferson University, where he became pharmacology professor and chairman of the pharmacology department from 1976 to 1987. In 1987, he stepped down from the chairmanship but remained professor of pharmacology. He retired in 1997 as professor emeritus.

Dr. Bianchi was a member of many professional groups, including the New York Academy of Sciences and the American Association for the Advancement of Science.

He was a leader and author in pharmacology, helping edit an industry journal and making himself available for consultation to medical examiners and experts in toxicology.

He wrote or contributed to three books and 200 scientific papers and lectured widely. He enjoyed mentoring medical and graduate students.

His family called Dr. Bianchi “a true renaissance man” who was as comfortable discussing English, history, and politics as he was the sciences.

 

 

 

The following was taken from a history of  Department of Pharmacology  at Thomas Jefferson University  and can be viewed at: http://jdc.jefferson.edu/cgi/viewcontent.cgi?article=1008&context=wagner2

 

 

Carmine Paul Bianchi, Ph.D;

Third Chairman (1976-1986)

The new Chairman of the Department, effective

July 1, 1976, was Carmine Paul Bianchi, Ph.D.

(Figure 8-3) from the University of Pennsylvania

School of Medicine, where he had been Professor

of Pharmacology since [969 and a member of the

faculty of that Department since 1961.

Dr. Bianchi was born on April 9, [927, in

Newark, New Jersey. After receiving his diploma

at Columbia High School in 1945, he spent two

years in the Army Medical Corps as Technical Sgt.

Fourth Grade. He then attended Columbia

University, where he majored in chemistry and

obtained the B.A. degree in 1950. Like Dr.

Gruber, the first Chairman of the Pharmacology

Department at Jefferson, Bianchi earned his Ph.D.

in physiology. He pursued his graduate studies at

Rutgers University, supplementing his physiology

major with a biochemistry minor for the M.S.

degree in [953 and with a physical chemistry minor

for the Ph.D. degree in 1956. Dr. Bianchi then

spent several years at the National Institutes of

Health-two years as a Public Health Fellow and

one as a Visiting Scientist. Following that he was

Assistant Member of the Institute for Muscle

Disease in New York for one year. In 1961 Dr.

Bianchi became classified professionally as a

pharmacologist by becoming an Associate in the

Department of Pharmacology at the University of

Pennsylvania School of Medicine. There he

advanced to Professorship in 1969 and remained

until he came to Jefferson. The evolution of Dr.

Bianchi’s career from physiology to pharmacology

was the logical result of his investigations of the

effect of various drugs on the metabolism and

distribution of some of the important elements of

the body, notably calcium. His major field of

interest became classified and remained in

electrolyte pharmacology.

Throughout his career Dr. Bianchi has been

very active in the affairs of outside professional

organizations. He is a member of the American

Society for Pharmacology and Experimental

Therapeutics, the American Physiological Society,

the American Chemical Society, and the

International Society of Toxicology, to name

only a few. He served as President of both the

Philadelphia Physiological Society and the John

Morgan Society in the same year (1973-1974), and

of the Philadelphia Chapter of the Society for

Neuroscience (1979-1980). He gave much time

and valuable services as Field Editor for the

Journal of Pharmacology and Experimental

Therapeutics ([970-1979) and as a member of the

Pharmacology Section of the National Board of

Medical Examiners (1981-1985).

After Dr. Bianchi became Chairman no

immediate changes in the general structure and

activities of the Department took place. He

enlarged the Department and filled vacancies

occasioned by the retirement of some faculty

members. The didactic schedules and subject

matter offered to the medical and graduate

students underwent only minor annual changes.

Research activities were augmented by the

addition of Dr. Bianchi’s specialty in electrolyte

pharmacology and the appointments of new staff

members for investigations in that and related

flelds. Through the following decade there was a

marked change in the faculty structure of the

Department. The [975 Jefferson catalogue, for

example, listed 15 faculty appointments in

Pharmacology, of which eight were on a primary

full-time basis with offices and laboratories in the

Department. In 1985 there were 36 faculty

appointments of which eight were on a primary

full-time basis. The large increase in the total

number of faculty resulted from adjunct

appointments from outside organizations and from

secondary appointments of faculty members of the

Clinical Departments at Jefferson. This expansion

reflected a broadening of interests and interactions

on both the scientific and clinical fronts in clinical

pharmacology and clinical toxicology.

A notable addition to the faculty of the

Department in 1978 was Dr. Hyman Menduke

as Professor of Pharmacology

(Biostatistics). After receiving his Ph.D. in

Economic Statistics at the University of

Pennsylvania, Menduke came to Jefferson in 1953

as Assistant Professor of Biostatistics with no

official Departmental affiliation until 1963, when

he was appointed Professor of Preventive

Medicine (Biostatistics). When Dr. Menduke first

came to Jefferson he gave a ten-hour course in

biostatistics to the second-year medical students in

time provided during their pharmacology course.

Through the years his offerings expanded to a

12-hour course for freshman medical students and

introductory and advanced courses for graduate

students. An early and valuable contribution was a

series of individual conferences with graduate

students on the statistical planning of their

research problems and the later analysis of their

data.

 

The interests and activities of the Department in

research in toxicology have been emphasized.

Toxicology continued as an important part of the

research program after Dr. Bianchi became

Chairman in 1976, although under his direction

the major emphasis in research became redirected

toward the general areas of cell pharmacology and

neuropharmacology.

In accord with its continuing research and

teaching activities in toxicology, the Department

starting in 1977 organized a series of annual

workshops on Industrial Toxicology sponsored by

the College of Graduate Studies. These were

four-day symposia on important toxicologic

problems in industry and the general environment,

presented by toxicologically involved Jefferson

faculty and by invited experts from other

universities, industry, and government.

In 1979 the Department was awarded a training

grant in Industrial and Environmental Toxicology

by the National Institute of Environmental Health

Sciences. The purpose of this award was to

provide postdoctoral training in toxicology for

individuals who had previously received their

Ph.D. degrees in other sciences. Ten M.S. degrees

were subsequently awarded in this program

through the years from 1981 to 1986.

On December 14, 1978, a full day’s workshop

with outside invited experts was held to discuss

the formation of a Toxicology Center and the

establishment of a Chair in Toxicology-Pathology

to broaden the base of research and training in

toxicology at Jefferson. It was envisioned that the

Center would be an administrative Division within

the Department of Pharmacology, with research

participation from other basic science departments

and the Department of Medicine. Although funds

accumulated in support of a Toxicology Center,

disagreements developed relating to the

administrative base of the Center.

 

A few articles from Dr. Bianchi showing the diversity of his research interests including calcium mobilization, neurotoxicology, and cellular metabolism and physiology.

Muscle fatigue and the role of transverse tubules.

Bianchi CP, Narayan S.

Science. 1982 Jan 15;215(4530):295-6. No abstract available.

 

Effect of adenosine on oxygen uptake and electrolyte content of frog sartorius muscle.

Prosdocimi M, Bianchi CP.

J Pharmacol Exp Ther. 1981 Jul;218(1):92-6.

 

The effect of diazepam on tension and electrolyte distribution in frog muscle.

Degroof RC, Bianchi CP, Narayan S.

Eur J Pharmacol. 1980 Aug 29;66(2-3):193-9.

 

Steady state maintenance of electrolytes in the spinal cord of the frog.

Bianchi CP, Erulkar SD.

J Neurochem. 1979 Jun;32(6):1671-7. No abstract available.

An in-vitro model of anesthetic hypertonic hyperpyrexia, halothane–caffeine-induced muscle contractures: prevention of contracture by procainamide.

Strobel GE, Bianchi CP.

Anesthesiology. 1971 Nov;35(5):465-73. No abstract available.

 

The effects of psychoactive agents on calcium uptake by preparations of rat brain mitochondria.

Tjioe S, Haugaard N, Bianchi CP.

J Neurochem. 1971 Nov;18(11):2171-8. No abstract available.

 

The effect of veratridine on sodium-sensitive radiocalcium uptake in frog sartorius muscle.

Johnson P, Bianchi CP.

Eur J Pharmacol. 1971 Sep;16(1):90-9. No abstract available.

 

The function of ATP in Ca2+ uptake by rat brain mitochondria.

Tjioe S, Bianchi CP, Haugaard N.

Biochim Biophys Acta. 1970 Sep 1;216(2):270-3. No abstract availabl

 

The effects of pH gradients on the uptake and distribution of C14-procaine and lidocaine in intact and desheathed sciatic nerve trunks.

Strobel GE, Bianchi CP.

J Pharmacol Exp Ther. 1970 Mar;172(1):18-32. No abstract available

 

 

More articles by CP Bianchi  can be found at: http://www.ncbi.nlm.nih.gov/pubmed/?term=Bianchi%20CP[auth]

The following is one of the seminal books Dr. Bianchi authored:

 

Role of Calcium Channels of the Sarcolemma and the Sarcoplasmic Reticulum in Skeletal Muscle Functions

http://link.springer.com/article/10.1007%2F978-1-4615-3362-7_17/lookinside/000.png

AND

Advances in General and Cellular Pharmacology (1976)

Toshio Narahashi; Carmine Paul Bianchi

The author of the Advances in General and Cellular Pharmacology is Toshio Narahashi; Carmine Paul Bianchi – very good writer. You can download this e-book absolutely for free. This ebook’s ISBN number is 9781461582007. if you were searching for for free download of kindle books, google books, free pdf books, pdf ebooks, e-books, pdf files or pdf ebooks just stay here for a while, download what you wanted for free and enjoy!

Advances in General and Cellular Pharmacology – Toshio Narahashi; Carmine Paul Bianchi – PDF Free Download Ebook also for Kindle

 

Other articles in this series published on this site include:

Heroes in Medical Research: Dr. Robert Ting, Ph.D. and Retrovirus in AIDS and Cancer

Heroes in Medical Research: Barnett Rosenberg and the Discovery of Cisplatin

Volume Two: Interviews with Scientific Leaders

 

 

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Following (or not) the guidelines for use of imaging in management of prostate cancer.

Writer and curator: Dror Nir, PhD

Over diagnosis and over treatment is a trend of the last two decades. It leads to increase in health-care costs and human-misery.

The following headline on Medscape; Swedes Show That We Can Improve Imaging in Prostate Cancer elicited my curiosity.

I was expecting “good news” – well, not this time!

In spite the “general language” the study that the above mentioned headline refers to is not addressing the global use of imaging in prostate cancer patients’ pathway but is specific to use of radionuclide bone-scans as part of patients’ staging.  The “bad-news” are that realization that the Swedish government had to invest many man-years to achieve “success” in reducing unnecessary use of such imaging in low risk patients. Moreover, the paper reveals under-use of such imaging technology for staging high risk prostate cancer patients.

Based on this paper, one could come to the conclusion that in reality, we are facing long lasting non-conformity with established guidelines related to the use of “full-body” imaging as part of the prostate cancer patients’ pathway in Europe and USA.

Here is a link to the original paper:

Prostate Cancer Imaging Trends After a Nationwide Effort to Discourage Inappropriate Prostate Cancer Imaging, Danil V. MakarovStacy LoebDavid UlmertLinda DrevinMats Lambe and Pär Stattin Correspondence to: Pär Stattin, MD, PhD, Department of Surgery and Perioperative Sciences, Urology and Andrology, Umeå University, SE- 901 87 Umeå, Sweden (e-mail:par.stattin@urologi.umu.se).

JNCI J Natl Cancer Inst (2013)doi: 10.1093/jnci/djt175

 

For convenience, here are the highlights:

  • Reducing inappropriate use of imaging to stage incident prostate cancer is a challenging problem highlighted recently as a Physician Quality Reporting System quality measure and by the American Society of Clinical Oncology and the American Urological Association in the Choosing Wisely campaign.

 

  • Since 2000, the National Prostate Cancer Register (NPCR) of Sweden has led an effort to decrease national rates of inappropriate prostate cancer imaging by disseminating utilization data along with the latest imaging guidelines to urologists in Sweden.

  • Results Thirty-six percent of men underwent imaging within 6 months of prostate cancer diagnosis. Overall, imaging use decreased over time, particularly in the low-risk category, among whom the imaging rate decreased from 45% to 3% (P < .001), but also in the high-risk category, among whom the rate decreased from 63% to 47% (P < .001). Despite substantial regional variation, all regions experienced clinically and statistically (P < .001) significant decreases in prostate cancer imaging.

 

t1

t2

fig1

fig2

  • These results may inform current efforts to promote guideline-concordant imaging in the United States and internationally.

  • In 1998, the baseline low-risk prostate cancer imaging rate in Sweden was 45%. Per the NCCN guidelines (7), none of these men should have received bone imaging unless they presented with symptoms suggestive of bone pain (8,24). In the United States, the imaging rate among men with low-risk prostate cancer has been reported to be 19% to 74% in a community cohort and 10% to 48% in a Surveillance Epidemiology and End Results (SEER)–Medicare cohort (10–13,16). It is challenging to compare these rates directly across the two countries because the NPCR aggregates all staging imaging into one variable. However, our sampling revealed that 88% of those undergoing imaging had at least a bone scan, whereas only 11% had any CTs and 10% had any MRI. This suggests that baseline rates of bone scan among low-risk men in Sweden were similar to those among their low-risk counterparts in the United States, whereas rates of axial imaging were likely much lower. During the study period, rates of prostate cancer imaging among low-risk men in Sweden decreased to 3%, substantially lower than those reported in the United States at any time.

  • Miller et al. describe a decline in imaging associated with a small-scale intervention administered in three urology practices located in the United States participating in a quality-improvement consortium. Our study’s contribution is to demonstrate that a similar strategy can be applied effectively at a national scale with an associated decline in inappropriate imaging rates, a finding of great interest for policy makers in the United States seeking to improve health-care quality.

  • In 1998, the baseline high-risk prostate cancer imaging rates in Sweden were 63%, and decreased by 43% in 2008 (rising slightly to 47% in 2009). Based on our risk category definitions and the guidelines advocated in Sweden, all of these men should have undergone an imaging evaluation (8,24). Swedish rates of prostate cancer imaging among men with high-risk disease are considerably lower than those reported from the SEER–Medicare cohort, where 70% to 75% underwent bone scan and 57% to 58% underwent CT (13,16). These already low rates of imaging among men with high-risk prostate cancer only decreased further during the NPCR’s effort to promote guideline-concordant imaging. Clearly in both countries, imaging for high-risk prostate cancer remains underused despite the general overuse of imaging and numerous guidelines encouraging its appropriate use (3–9).

Similar items I have covered on this this Open Access Online Scientific Journal:

Not applying evidence-based medicine drives up the costs of screening for breast-cancer in the USA.

Read Full Post »

Nitric Oxide Mitigates Sensitivity of Melanoma Cells to Cisplatin

Reporter/Curator: Stephen J. Williams, Ph.D.

Article ID #75: Nitric Oxide Mitigates Sensitivity of Melanoma Cells to Cisplatin. Published on 8/7/2013

WordCloud Image Produced by Adam Tubman

Screen Shot 2021-07-19 at 7.12.54 PM

Word Cloud By Danielle Smolyar

Picture of a human melanoma cell line growing in tissue culture

Cultured human melanocytes .

Nitric oxide (NO), a gas with many biological functions in healthy cells, has also been implicated in the development of pathologies such as cancer.  Nitric oxide may also play a role in chemotherapeutic reisitance. For example it had been known (in the 1996 Melanoma study by Joshi et al. curated below) that nitric oxide synthase activity (the enzyme system which produces NO) was significantly elevated in cultured melanoma cell lines versus normal melanocytes.   Although it is known that many protein and enzymes systems could be directly covalently-modified by nitric oxide, either by S-nitrosylation or NO-NAD+ modifications (one of my earlier postings described one such protein modified by nitric oxide, GAPDH, and the effect these NO-modifications of GAPDH has on the etiology of various pathologies.), the molecular mechanisms by which these modifications affect cellular processes, lead to disease etiology, the proteins which are affected, and mechanisms related to chemotherapeutic sensitivity need to be further characterized. A new study from MIT reveals how NO-induced modifications may reduce cisplatin sensitivity in melanoma cells.  This study focuses on how decreasing nitric oxide levels in melanoma cells increases their cisplatin sensitivity.  The study also describes a possible mechanism for this effect: NO-induced modifications of the proapoptotic enzyme caspace-3 and prolyl-hdroxylase-2 (responsible for targeting prosurvival HIF-1α for proteosomal degradation).  Also, for a description of other cancer-related targets of nitric oxide please see the posting by Dr. Saxena at Crucial role of Nitric Oxide in Cancer on this site.

To read more background on nitric oxide and its role in disease etiology please see our e-book Perspectives on Nitric Oxide in Disease Mechanisms (Biomed e-Books) available on Amazon at:

http://www.amazon.com/Perspectives-Nitric-Disease-Mechanisms-ebook/dp/B00DINFFYC

      It is important, however, to note that most of these relationships between NO-induced protein modification and its relationship to disease mechanisms are causal, meaning that, in general, one notices a nitric-induced modification of a protein/enzyme with concomitant alteration of protein/enzyme function occurring in a disease/phenotype.  However, unlike reversible modifications, which have a cadre of pharmacologic inhibitors, nitric oxide induced modifications are covalent and nonenzymatic, therefore hindering easy cause/effect relationships.

With that said, the following was adapted from the MIT site at http://web.mit.edu/newsoffice/2013/how-melanoma-evades-chemotherapy-0407.html.

  

 

The findings from Dr. Luiz Godoy’s PNAS paper ENDOGENOUSLY PRODUCED NITRIC OXIDE MITIGATES SENSITIVITY OF MELANOMA CELLS TO CISPLATIN,  were presented at the 2013 annual meeting of the American Association for Cancer Research. The prognosis is generally worse for patients whose tumors have high levels of NO, said Luiz Godoy, an MIT research associate and lead author of the study.

Godoy and his colleagues have unraveled the mechanism behind melanoma’s resistance to cisplatin, a commonly used chemotherapy drug, and, in ongoing studies, have found that cisplatin treatment also increases NO levels in breast and colon cancers.

“This could be a mechanism that is widely shared in different cancers, and if you use the drugs that are already used to treat cancer, along with other drugs that could scavenge or decrease the production of NO, you may have a synergistic effect,” said Godoy, who works in the lab of Gerald Wogan, an MIT professor emeritus of biological engineering and senior author of the study.

NO has many roles within living cells. At low concentrations, it helps regulate processes such as cell death and muscle contraction. NO, which is a free radical, is also important for immune-system function. Immune cells, such as macrophages, produce large amounts of NO during infection, helping to kill invading microbes by damaging their DNA or other cell components.

“It’s really a molecule that has a dual effect,” Godoy said. “At low concentrations it can act as a signaling molecule, while high concentrations will be toxic.”

Knocking out NO

In the new study, the researchers treated melanoma cells grown in the lab with drugs that capture NO before it can act. They then treated the cells with cisplatin and tracked cell-death rates. The NO-depleted cells became much more sensitive to the drug, confirming earlier findings.

The MIT team then went a step further, investigating how NO confers its survival benefits. It was already known that NO can alter protein function through a process known as S-nitrosation, which involves attaching NO to the target protein. S-nitrosation can affect many proteins, but in this study the researchers focused on two that are strongly linked with cell death and survival, known as caspase-3 and PHD2.

The role of caspase-3 is to stimulate cell suicide, under the appropriate conditions, but adding NO to the protein deactivates it. This prevents the cell from dying even when treated with cisplatin, a drug that produces massive DNA damage.

PHD2 is also involved in cell death; its role is to help break down another protein called HIF-1 alpha, which is a pro-survival protein. When NO inactivates PHD2, HIF-1 alpha stays intact and keeps the cell alive.

“Now we have a mechanistic link between nitric oxide and the increased aggressiveness of melanoma,” said Douglas Thomas, an assistant professor of medicinal chemistry and pharmacognosy at the University of Illinois at Chicago, who was not part of the research team. “It certainly would be worth exploring whether this mechanism is also present in different tumor types as well.”

The MIT researchers also found in some cancer cells, NO levels were five times higher than normal following cisplatin treatment. Godoy is now investigating how cisplatin stimulates that NO boost, and is also looking for other proteins that NO may be targeting.

Source: http://web.mit.edu/newsoffice/2013/how-melanoma-evades-chemotherapy-0407.html

Melanoma Res. 1996 Apr;6(2):121-6.

Nitric oxide synthase activity is up-regulated in melanoma cell lines: a potential mechanism for metastases formation.

Joshi M, Strandhoy J, White WL.

Source

Department of Dermatology, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, NC 27157, USA.

Abstract

Nitric oxide (NO) may be an important mediator of tumour angiogenesis and metastasis formation. Tumour cell derived NO may be important in the regulation of angiogenesis and vasodilatation of the blood vessels surrounding a tumour. The aims of the present study were, firstly, to determine whether malignant melanoma cells and normal melanocytes had nitric oxide synthase (NOS) activity (measured by the conversion of L-arginine to L-citrulline) and, secondly, to determine whether there was a difference in NOS activity between malignant and normal cell types. This paper assays NOS activity directly in lysates from normal human melanocyte and malignant melanoma cell lines. The enzyme activity was not inducible with bacterial lipopolysaccharide and could be heat denatured. The activity of NOS was demonstrated to be both NADPH- and calcium-dependent and it was inhibitable in a dose-dependent manner by the NOS inhibitor Nw-nitro-L-arginine methyl ester. We conclude that melanoma and melanocyte cells express a constitutive form of NOS. Finally, nitric oxide synthase activity in melanoma cell lines was found to be significantly greater than in normal melanocytes. These findings suggest that NO synthesis is elevated in malignant melanoma. An elevated NO concentration in melanoma is expected to promote metastases by maintaining a vasodilator tone in the blood vessels in and around the melanoma.

Proc Natl Acad Sci U S A. 2012 Dec 11;109(50):20373-8. doi: 10.1073/pnas.1218938109. Epub 2012 Nov 26.

Endogenously produced nitric oxide mitigates sensitivity of melanoma cells to cisplatin.

Godoy LC, Anderson CT, Chowdhury R, Trudel LJ, Wogan GN.

Source

Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Abstract

Melanoma patients experience inferior survival after biochemotherapy when their tumors contain numerous cells expressing the inducible isoform of NO synthase (iNOS) and elevated levels of nitrotyrosine, a product derived from NO. Although several lines of evidence suggest that NO promotes tumor growth and increases resistance to chemotherapy, it is unclear how it shapes these outcomes. Here we demonstrate that modulation of NO-mediated S-nitrosation of cellular proteins is strongly associated with the pattern of response to the anticancer agent cisplatin in human melanoma cells in vitro. Cells were shown to express iNOS constitutively, and to generate sustained nanomolar levels of NO intracellularly. Inhibition of NO synthesis or scavenging of NO enhanced cisplatin-induced apoptotic cell death. Additionally, pharmacologic agents disrupting S-nitrosation markedly increased cisplatin toxicity, whereas treatments favoring stabilization of S-nitrosothiols (SNOs) decreased its cytotoxic potency. Activity of the proapoptotic enzyme caspase-3 was higher in cells treated with a combination of cisplatin and chemicals that decreased NO/SNOs, whereas lower activity resulted from cisplatin combined with stabilization of SNOs. Constitutive protein S-nitrosation in cells was detected by analysis with biotin switch and reduction/chemiluminescence techniques. Moreover, intracellular NO concentration increased significantly in cells that survived cisplatin treatment, resulting in augmented S-nitrosation of caspase-3 and prolyl-hydroxylase-2, the enzyme responsible for targeting the prosurvival transcription factor hypoxia-inducible factor-1α for proteasomal degradation. Because activities of these enzymes are inhibited by S-nitrosation, our data thus indicate that modulation of intrinsic intracellular NO levels substantially affects cisplatin toxicity in melanoma cells. The underlying mechanisms may thus represent potential targets for adjuvant strategies to improve the efficacy of chemotherapy.

Other posts on this site regarding Nitric Oxide and Cancer include:

Crucial role of Nitric Oxide in Cancer

Nitric Oxide Covalent Modifications: A Putative Therapeutic Target?

Nitric Oxide has a ubiquitous role in the regulation of glycolysis -with a concomitant influence on mitochondrial function

Nitric Oxide Signalling Pathways

In focus: Melanoma therapeutics

Combined anti-CTLA4 and anti-PD1 immunotherapy shows promising results against advanced melanoma

Whole exome somatic mutations analysis of malignant melanoma contributes to the development of personalized cancer therapy for this disease

In focus: Melanoma therapeutics

In focus: Melanoma Genetics

Read Full Post »

 

Abstract:

The immune response mechanism is the holy grail of the human defense system for health.   IDO, indolamine 2, 3-dioxygenase, is a key gene for homeostasis of immune responses and producing an enzyme catabolizing the first rate-limiting step in tryptophan degradation metabolism. The hemostasis of immune system is complicated.  In this review, the  properties of IDO such as basic molecular genetics, biochemistry and genesis will be discussed.

IDO belongs to globin gene family to carry oxygen and heme.  The main function and genesis of IDO comes from the immune responses during host-microbial invasion and choice between tolerance and immunegenity.  In human there are three kinds of IDOs, which are IDO1, IDO2, and TDO, with distinguished mechanisms and expression profiles. , IDO mechanism includes three distinguished pathways: enzymatic acts through IFNgamma, non-enzymatic acts through TGFbeta-IFNalpha/IFNbeta and moonlighting acts through AhR/Kyn.

The well understood functional genomics and mechanisms is important to translate basic science for clinical interventions of human health needs. In conclusion, overall purpose is to find a method to manipulate IDO to correct/fix/modulate immune responses for clinical applications.

The first part of the review concerns the basic science information gained overall several years that lay the foundation where translational research scientist should familiar to develop a new technology for clinic. The first connection of IDO and human health came from a very natural event that is protection of pregnancy in human. The focus of the translational medicine is treatment of cancer or prevention/delay cancer by stem cell based Dendritic Cell Vaccine (DCvax) development.

Table of Contents:

  • Abstract

1         Introduction: IDO gene encodes a heme enzyme

2        Location, location, location

3        Molecular genetics

4        Types of IDO:

4.1       IDO1,

4.2       IDO2,

4.3       IDO-like proteins

5        Working mechanisms of IDO

6        Infection Diseases and IDO

7. Conclusion

  1. 1.     Indoleamine 2, 3-dioxygenase (IDO) gene encodes a heme enzyme

IDO is a key homeostatic regulator and confined in immune system mechanism for the balance between tolerance and immunity.  This gene encodes indoleamine 2, 3-dioxygenase (IDO) – a heme enzyme (EC=1.13.11.52) that catalyzes the first rate-limiting step in tryptophan catabolism to N-formyl-kynurenine and acts on multiple tryptophan substrates including D-tryptophan, L-tryptophan, 5-hydroxy-tryptophan, tryptamine, and serotonin.

The basic genetic information describes indoleamine 2, 3-dioxygenase 1 (IDO1, IDO, INDO) as an enzyme located at Chromosome 8p12-p11 (5; 6) that active at the first step of the Tryptophan catabolism.    The cloned gene structure showed that IDO contains 10 exons ad 9 introns (7; 8) producing 9 transcripts.

After alternative splicing only five of the transcripts encode a protein but the other four does not make protein products, three of transcripts retain intron and one of them create a nonsense code (7).  Based on IDO related studies 15 phenotypes of IDO is identified, of which, twelve in cancer tumor models of lung, kidney, endometrium, intestine, two in nervous system, and one HGMD- deletion.

  1. 2.     Location, Location and Location

The specific cellular location of IDO is in cytosol, smooth muscle contractile fibers and stereocilium bundle. The expression specificity shows that IDO is present very widely in all cell types but there is an elevation of expression in placenta, pancreas, pancreas islets, including dendritic cells (DCs) according to gene atlas of transcriptome (9).  Expression of IDO is common in antigen presenting cells (APCs), monocytes (MO), macrophages (MQs), DCs, T-cells, and some B-cells. IDO present in APCs (10; 11), due to magnitude of role play hierarchy and level of expression DCs are the better choice but including MOs during establishment of three DC cell subset, CD14+CD25+, CD14++CD25+ and CD14+CD25++ may increase the longevity and efficacy of the interventions.

IDO is strictly regulated and confined to immune system with diverse functions based on either positive or negative stimulations. The positive stimulations are T cell tolerance induction, apoptotic process, and chronic inflammatory response, type 2 immune response, interleukin-12 production (12).  The negative stimulations are interleukin-10 production, activated T cell proliferation, T cell apoptotic process.  Furthermore, there are more functions allocating fetus during female pregnancy; changing behavior, responding to lipopolysaccharide or multicellular organismal response to stress possible due to degradation of tryptophan, kynurenic acid biosynthetic process, cellular nitrogen compound metabolic process, small molecule metabolic process, producing kynurenine process (13; 14; 15).

IDO plays a role in a variety of pathophysiological processes such as antimicrobial and antitumor defense, neuropathology, immunoregulation, and antioxidant activity (16; 17; 18; 19).

 

 3.     Molecular Genetics of IDO:

A: Structure of human IDO2 gene and transcripts. Complete coding region is 1260 bps encoding a 420 aa polypeptide. Alternate splice isoforms lacking the exons indicated are noted. Hatch boxes represent a frameshift in the coding region to an alternate reading frame leading to termination. Black boxes represent 3' untranslated regions. Nucleotide numbers, intron sizes, and positioning are based on IDO sequence files NW_923907.1 and GI:89028628 in the Genbank database. (reference: http://atlasgeneticsoncology.org/Genes/IDO2ID44387ch8p11.html)

A: Structure of human IDO2 gene and transcripts. Complete coding region is 1260 bps encoding a 420 aa polypeptide. Alternate splice isoforms lacking the exons indicated are noted. Hatch boxes represent a frameshift in the coding region to an alternate reading frame leading to termination. Black boxes represent 3′ untranslated regions. Nucleotide numbers, intron sizes, and positioning are based on IDO sequence files NW_923907.1 and GI:89028628 in the Genbank database.
(reference: http://atlasgeneticsoncology.org/Genes/IDO2ID44387ch8p11.html)

Molecular genetics data from earlier findings based on reporter assay results showed that IDO promoter is regulated by ISRE-like elements and GAS-sequence at -1126 and -1083 region (20).  Two cis-acting elements are ISRE1 (interferon sequence response element 1) and interferon sequence response element 2 (ISRE2).

Analyses of site directed and deletion mutation with transfected cells demonstrated that introduction of point mutations at these elements decreases the IDO expression. Removing ISRE1 decreases the effects of IFNgamma induction 50 fold and deleting ISRE1 at -1126 reduced by 25 fold (3). Introducing point mutations in conserved t residues at -1124 and -1122 (from T to C or G) in ISRE consensus sequence NAGtttCA/tntttNCC of IFNa/b inducible gene ISG4 eliminates the promoter activity by 24 fold (21).

ISRE2 have two boxes, X box (-114/1104) and Y Box 9-144/-135), which are essential part of the IFNgamma response region of major histocompatibility complex class II promoters (22; 23).  When these were removed from ISRE2 or introducing point mutations at two A residues of ISRE2 at -111 showed a sharp decrease after IFNgamma treatment by 4 fold (3).

The lack of responses related to truncated or deleted IRF-1 interactions whereas IRF-2, Jak2 and STAT91 levels were similar in the cells, HEPg2 and ME180 (3). Furthermore, 748 bp deleted between these elements did not affect the IDO expression, thus the distance between ISRE1 and ISRE2 elements have no function or influence on IDO (3; 24)

B: Amino acid alignment of IDO and IDO2. Amino acids determined by mutagenesis and the crystal structure of IDO that are critical for catalytic activity are positioned below the human IDO sequence. Two commonly occurring SNPs identified in the coding region of human IDO2 are shown above the sequence which alter a critical amino acid (R248W) or introduce a premature termination codon (Y359stop).

B: Amino acid alignment of IDO and IDO2. Amino acids determined by mutagenesis and the crystal structure of IDO that are critical for catalytic activity are positioned below the human IDO sequence. Two commonly occurring SNPs identified in the coding region of human IDO2 are shown above the sequence which alter a critical amino acid (R248W) or introduce a premature termination codon (Y359stop).

4.     There are three types of IDO in human genome:

IDO was originally discovered in 1967 in rabbit intestine (25). Later, in 1990 the human IDO gene is cloned and sequenced (7).  However, its importance and relevance in immunology was not created until prevention of allocation of fetal rejection and founding expression in wide range of human cancers (26; 27).

There are three types of IDO, pro-IDO like, IDO1, and IDO2.  In addition, another enzyme called TDO, tryptophan 2, 3, dehydrogenase solely degrade L-Trp at first-rate limiting mechanism in liver and brain.

4.1.  IDO1:

IDO1 mechanism is the target for immunotherapy applications. The initial discovery of IDO in human physiology is protection of pregnancy (1) since lack of IDO results in premature recurrent abortion (28; 26; 29).   The initial rate-limiting step of tryptophan metabolism is catalyzed by either IDO or tryptophan 2, 3-dioxygenase (TDO).

Structural studies of IDO versus TDO presenting active site environments, conserved Arg 117 and Tyr113, found both in TDO and IDO for the Tyr-Glu motif, but His55 in TDO replaced by Ser167b in IDO (30; 2). As a result, they are regulated with different mechanisms (1; 2) (30).  The short-lived TDO, about 2h, responds to level of tryptophan and its expression regulated by glucorticoids (31; 32).  Thus, it is a useful target for regulation and induced by tryptophan so that increasing tryptophan induces NAD biosynthesis. Whereas, IDO is not activated by the level of Trp presence but inflammatory agents with its interferon stimulated response elements (ISRE1 and ISRE2) in its (33; 34; 35; 36; 3; 10) promoter.

TDO promoter contains glucorticoid response elements (37; 38) and regulated by glucocorticoids and other available amino acids for gluconeogenesis. This is how IDO binds to only immune response cells and TDO relates to NAD biosynthesis mechanisms. Furthermore, TDO is express solely in liver and brain (36).  NAD synthesis (39) showed increased IDO ubiquitous and TDO in liver and causing NAD level increase in rat with neuronal degeneration (40; 41).  NAM has protective function in beta-cells could be used to cure Type1 diabetes (40; 42; 43). In addition, knowledge on NADH/NAD, Kyn/Trp or Trp/Kyn ratios as well as Th1/Th2, CD4/CD8 or Th17/Threg are equally important (44; 40).

Active site of IDO–PI complex. (A) Stereoview of the residues around the heme of IDO viewed from the side of heme plane. The proximal ligand H346 is H-bonded to wa1. The 6-propionate of the heme contacts with wa2 and R343 Nε. The wa2 is H-bonded to wa1, L388 O, and 6-propionate. Mutations of F226, F227, and R231 do not lose the substrate affinity but produce the inactive enzyme. Two CHES molecules are bound in the distal pocket. The cyclohexan ring of CHES-1 (green) contacts with F226 and R231. The 7-propionate of the heme interacts with the amino group of CHES-1 and side chain of Ser-263. The mutational analyses for these distal residues are shown in Table 1. (B) Top view of A by a rotation of 90°. The proximal residues are omitted. (http://www.pnas.org/content/103/8/2611/F3.expansion.html)

Active site of IDO–PI complex. (A) Stereoview of the residues around the heme of IDO viewed from the side of heme plane. The proximal ligand H346 is H-bonded to wa1. The 6-propionate of the heme contacts with wa2 and R343 Nε. The wa2 is H-bonded to wa1, L388 O, and 6-propionate. Mutations of F226, F227, and R231 do not lose the substrate affinity but produce the inactive enzyme. Two CHES molecules are bound in the distal pocket. The cyclohexan ring of CHES-1 (green) contacts with F226 and R231. The 7-propionate of the heme interacts with the amino group of CHES-1 and side chain of Ser-263. The mutational analyses for these distal residues are shown in Table 1. (B) Top view of A by a rotation of 90°. The proximal residues are omitted. (http://www.pnas.org/content/103/8/2611/F3.expansion.html)

4.2. IDO2:

The third type of IDO, called IDO2 exists in lower vertebrates like chicken, fish and frogs (45) and in human with differential expression properties. The expression of IDO2 is only in DCs, unlike IDO1 expresses on both tumors and DCs in human tissues.  Yet, in lower invertebrates IDO2 is not inhibited by general inhibitor of IDO, D-1-methyl-tryptophan (1MT) (46).   Recently, two structurally unusual natural inhibitors of IDO molecules, EXIGUAMINES A and B, are synthesized (47).  LIP mechanism cannot be switch back to activation after its induction in IDO2 (46).

Crucial cancer progression can continue with production of IL6, IL10 and TGF-beta1 to help invasion and metastasis.  Inclusion of two common SNPs affects the function of IDO2 in certain populations.  SNP1 reduces 90% of IDO2 catalytic activity in 50% of European and Asian descent and SNP2 produce premature protein through inclusion of stop-codon in 25% of African descent lack functional IDO2 (Uniport).

4.3. IDO-like proteins: The Origin of IDO:

Knowing the evolutionary steps will helps us to identify how we can manage the regulator function to protect human health in cancer, immune disorders, diabetes, and infectious diseases.

Bacterial IDO has two types of IDOs that are group I and group II IDO (48).  These are the earliest version of the IDO, pro-IDO like, proteins with a quite complicated function.  Each microorganism recognized by a specific set of receptors, called Toll-Like Receptors (TLR), to activate the IDO-like protein expression based on the origin of the bacteria or virus (49; 35).   Thus, the genesis of human IDO originates from gene duplication of these early bacterial versions of IDO-like proteins after their invasion interactions with human host.  IDO1 only exists in mammals and fungi.

Fungi also has three types of IDO; IDOa, IDO beta, and IDO gamma (50) with different properties than human IDOs, perhaps multiple IDO is necessary for the world’s decomposers.

All globins, haemoglobins and myoglobins are destined to evolve from a common ancestor, which  is only 14-16kDa (51) length. Binding of a heme and being oxygen carrier are central to the enzyme mechanism of this family.  Globins are classified under three distinct origins; a universal globin, a compact globin, and IDO-like globin (52) IDO like globin widely distributed among gastropodic mollusks (53; 51).  The indoleamine 2, 3-dioxygenase 1–like “myoglobin” (Myb) was discovered in 1989 in the buccal mass of the abalone Sulculus diversicolor (54).

The conserved region between Myb and IDO-like Myb existed for at least 600 million years (53) Even though the splice junction of seven introns was kept intact, the overall homolog region between Myb and IDO is only about 35%.

No significant evolutionary relationship is found between them after their amino acid sequence of each exon is compared to usual globin sequences. This led the hint that molluscan IDO-like protein must have other functions besides carrying oxygen, like myoglobin.   Alignment of S. cerevisiae cDNA, mollusk and vertebrate IDO–like globins show the key regions for controlling IDO or myoglobin function (55). These data suggest that there is an alternative pathways of myoglobin evolution.  In addition, understanding the diversity of globin may help to design better protocols for interventions of diseases.

Mechanisms of IDO:

The dichotomy of IDO mechanism lead the discovery that IDO is more than an enzyme as a versatile regulator of innate and adaptive immune responses in DCs (66; 67; 68). Meantime IDO also involve with Th2 response and B cell mediated autoimmunity showing that it has three paths, short term (acute) based on enzymatic actions, long term (chronic) based on non-enzymatic role, and moonlighting relies of downstream metabolites of tryptophan metabolism (69; 70).

IFNgamma produced by DC, MQ, NK, NKT, CD4+ T cells and CD8+ T cells, after stimulation with IL12 and IL8.  Inflammatory cytokine(s) expressed by DCs produce IFNgamma to stimulate IDO’s enzymatic reactions in acute response.  Then, TDO in liver and tryptophan catabolites act through Aryl hydrocarbon receptor induction for prevention of T cell proliferation. This mechanism is common among IDO, IDO2 (expresses in brain and liver) and TDO expresses in liver) provide an acute response for an innate immunity (30). When the pDCs are stimulated with IFNgamma, activation of IDO is go through Jak, STAT signaling pathway to degrade Trp to Kyn causing Trp depletion. The starvation of tryptophan in microenvironment inhibits generation of T cells by un-read t-RNAs and induce apoptosis through myc pathway.  In sum, lack of tryptophan halts T cell proliferation and put the T cells in apoptosis at S1 phase of cell division (71; 62).

The intermediary enzymes, functioning during Tryptophan degradation in Kynurenine (Kyn) pathway like kynurenine 3-hydroxylase and kynureninase, are also induced after stimulation with liposaccaride and proinflammatory cytokines (72). They exhibit their function in homeostasis through aryl-hydrocarbon receptor (AhR) induction by kynurenine as an endogenous signal (73; 74).  The endogenous tumor-promoting ligand of AhR are usually activated by environmental stress or xenobiotic toxic chemicals in several cellular processes like tumorigenesis, inflammation, transformation, and embryogenesis (Opitz ET. Al, 2011).

Human tumor cells constitutively produce TDO also contributes to production of Kyn as an endogenous ligand of the AhR (75; 27).  Degradation of tryptophan by IDO1/2 in tumors and tumor-draining lymph nodes occur. As a result, there are animal studies and Phase I/II clinical trials to inhibit the IDO1/2 to prevent cancer and poor prognosis (NewLink Genetics Corp. NCT00739609, 2007).

 IDO mechanism for immune response

Systemic inflammation (like in sepsis, cerebral malaria and brain tumor) creates hypotension and IDO expression has the central role on vascular tone control (63).  Moreover, inflammation activates the endothelial coagulation activation system causing coagulopathies on patients.  This reaction is namely endothelial cell activation of IDO by IFNgamma inducing Trp to Kyn conversion. After infection with malaria the blood vessel tone has decreases, inflammation induce IDO expression in endothelial cells producing Kyn causing decreased trp, lower arterial relaxation, and develop hypotension (Wang, Y. et. al 2010).  Furthermore, existing hypotension in knock out Ido mice point out a secondary mechanism driven by Kyn as an endogenous ligand to activate non-canonical NfKB pathway (63).

Another study also hints this “back –up” mechanism by a significant outcome with a differential response in pDCs against IMT treatment.  Unlike IFN gamma conditioned pDC blocks T cell proliferation and apoptosis, methyl tryptophan fails to inhibit IDO activity for activating naïve T cells to make Tregs at TGF-b1 conditioned pDCs (77; 78).

 Indoleamine-Pyrrole 2,3,-Dioxygenase; IDO dioxygenase; Indeolamine-2,3

The second role of the IDO relies on non-enzymatic action as being a signal molecule. Yet, IDO2 and TDO are devoid of this function. This role mainly for maintenance of microenvironment condition. DCs response to TGFbeta-1 exposure starts the kinase Fyn induce phosphorylation of IDO-associated immunoreceptor tyrosine–based inhibitory motifs (ITIMs) for propagation of the downstream signals involving non-canonical (anti-inflammatory) NF-kB pathway for a long term response. When the pDCs are conditioned with TGF-beta1 the signaling (68; 77; 78) Phospho Inositol Kinase3 (PIK-3)-dependent and Smad independent pathways (79; 80; 81; 82; 83) induce Fyn-dependent phosphorylation of IDO ITIMs.  A prototypic ITIM has the I/V/L/SxYxxL/V/F sequence (84), where x in place of an amino acid and Y is phosphorylation sites of tyrosines (85; 86).

Smad independent pathway stimulates SHP and PIK3 induce both SHP and IDO phosphorylation. Then, formed SHP-IDO complex can induce non-canonical (non-inflammatory) NF-kB pathway (64; 79; 80; 82) by phosphorylation of kinase IKKa to induce nuclear translocation of p52-Relb towards their targets.  Furthermore, the SHP-IDO complex also may inhibit IRAK1 (68). SHP-IDO complex activates genes through Nf-KB for production of Ido1 and Tgfb1 genes and secretion of IFNalpha/IFNbeta.  IFNa/IFNb establishes a second short positive feedback loop towards p52-RelB for continuous gene expression of IDO, TGFb1, IFNa and IFNb (87; 68).  However, SHP-IDO inhibited IRAK1 also activates p52-RelB.  Nf-KB induction at three path, one main and two positive feedback loops, is also critical.  Finally, based on TGF-beta1 induction (76) cellular differentiation occurs to stimulate naïve CD4+ T cell differentiation to regulatory T cells (Tregs).  In sum, TGF-b1 and IFNalpha/IFNbeta stimulate pDCs to keep inducing naïve T cells for generation of Treg cells at various stages, initiate, maintain, differentiate, infect, amplify, during long-term immune responses (67; 66).

Moonlighting function of Kyn/AhR is an adaptation mechanism after the catalytic (enzymatic) role of IDO depletes tryptophan and produce high concentration of Kyn induce Treg and Tr1 cell expansion leading Tregs to use TGFbeta for maintaining this environment (67; 76). In this role, Kyn pathway has positive-feedback-loop function to induce IDO expression.

In T cells, tryptophan starvation induces Gcn2-dependent stress signaling pathway, which initiates uncharged Trp-tRNA binding onto ribosomes. Elevated GCN2 expression stimulates elF2alfa phosphorylation to stop translation initiation (88). Therefore, most genes downregulated and LIP, an alternatively initiated isoform of the b/ZIP transcription factor NF-IL6/CEBP-beta (89).

This mechanism happens in tumor cells based on Prendergast group observations. As a result, not only IDO1 propagates itself while producing IFNalpha/IFNbeta, but also demonstrates homeostasis choosing between immunegenity by production of TH17or tolerance by Tregs. This mechanism acts like a see-saw. Yet, tolerance also can be broken by IL6 induction so reversal mechanism by SOC-3 dependent proteosomal degradation of the enzyme (90).  All proper responses require functional peripheral DCs to generate mature DCs for T cells to avoid autoimmunity (91).

Niacin (vitamin B3) is the final product of tryptophan catabolism and first molecule at Nicotinomic acid (NDA) Biosynthesis.  The function of IDO in tryptophan and NDA metabolism has a great importance to develop new clinical applications (40; 42; 41).  NAD+, biosynthesis and tryptophan metabolisms regulate several steps that can be utilize pharmacologically for reformation of healthy physiology (40).

IDO for protection in Microbial Infection with Toll-like Receptors

The mechanism of microbial response and infectious tolerance are complex and the origination of IDO based on duplication of microbial IDO (49).  During microbial responses, Toll-like receptors (TLRs) play a role to differentiate and determine the microbial structures as a ligand to initiate production of cytokines and pro-inflammatory agents to activate specific T helper cells (92; 93; 94; 95). Uniqueness of TLR comes from four major characteristics of each individual TLR by ligand specificity, signal transduction pathways, expression profiles and cellular localization (96). Thus, TLRs are important part of the immune response signaling mechanism to initiate and design adoptive responses from innate (naïve) immune system to defend the host.

TLRs are expressed cell type specific patterns and present themselves on APCs (DCs, MQs, monocytes) with a rich expression levels (96; 97; 98; 99; 93; 100; 101; 102; 87). Induction signals originate from microbial stimuli for the genesis of mature immune response cells.  Co-stimulation mechanisms stimulate immature DCs to travel from lymphoid organs to blood stream for proliferation of specific T cells (96).  After the induction of iDCs by microbial stimuli, they produce proinflammatory cytokines such as TNF and IL-12, which can activate differentiation of T cells into T helper cell, type one (Th1) cells. (103).

Utilizing specific TLR stimulation to link between innate and acquired responses can be possible through simple recognition of pathogen-associated molecular patterns (PAMPs) or co-stimulation of PAMPs with other TLR or non-TLR receptors, or even better with proinflammatory cytokines.   Some examples of ligand- TLR specificity shown in Table1, which are bacterial lipopeptides, Pam3Cys through TLR2 (92; 104; 105).  Double stranded (ds) RNAs through TLR3 (106; 107), Lipopolysaccharide (LPS) through TLR4, bacterial flagellin through TLR5 (108; 109), single stranded RNAs through TLR7/8 (97; 98), synthetic anti-viral compounds imiquinod through TLR 7 and resiquimod through TLR8, unmethylated CpG DNA motifs through TLR9 (Krieg, 2000).

IDO action

Then, the specificity is established by correct pairing of a TLR with its proinflammatory cytokines, so that these permutations influence creation and maintenance of cell differentiation. For example, leading the T cell response toward a preferred Th1 or Th2 response possible if the cytokines TLR-2 mediated signals induce a Th2 profile when combined with IL-2 but TLR4 mediated signals lean towards Th1 if it is combined with IL-10 or Il-12, (110; 111)  (112).

TLR ligand TLR Reference
Lipopolysaccharide, LPS TLR4 (96).  (112).
Lipopeptides, Pam3Cys TLR2 (92; 104; 105)
Double stranded (ds) RNAs TLR3 (106; 107)
Bacterial flagellin TLR5 (108; 109)
Single stranded RNAs TLR7/8 (97; 98)
Unmethylated CpG DNA motifs TLR9 (Krieg, 2000)
Synthetic anti-viral compounds imiquinod and resiquimod TLR7 and TLR8 (Lee J, 2003)

Furthermore, if the DCs are stimulated with IL-6, DCs relieve the suppression of effector T cells by regulatory T cells (113).

The modification of IDO+ monocytes manage towards specific subset of T cell activation with specific TLRs are significantly important (94).

The type of cell with correct TLR and stimuli improves or decreases the effectiveness of stimuli. Induction of IDO in monocytes by synthetic viral RNAs (isRNA) and CMV was possible, but not in monocyte derived DCs or TLR2 ligand lipopeptide Pam3Cys since single- stranded RNA ligands target TLR7/8 in monocytes derive DCs only (Lee J, 2003).  These data show that TLRs has ligand specificity, signal transduction pathways, expression profiles and cellular localization so design of experiments should follow these rules.

Conclusion:

Overall our purpose of this information is to find a method to manipulate IDO to correct/fix/modulate immune responses for clinical applications.  This first part of the review concerns the basic science information gained overall several years that lay the foundation that translational research scientist should familiar to develop a new technology for clinic. The first connection of IDO and human health came from a very natural event that is protection of pregnancy in human. The focus of the translational medicine is treatment of cancer or prevention/delay cancer by stem cell based Dendritic Cell Vaccine (DCvax) development.

References

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Affordable Care Act became law in 2010, Cardiologists’ Practice Management Decisions Unclear

Reporter: Aviva Lev-Ari, PhD, RN

Washington-Watch

ACA Delays Decisions in Cardiology

Published: Jun 28, 2013

By Chris Kaiser, Cardiology Editor, MedPage Today
Since the Affordable Care Act became law in 2010, cardiologists have been mired in a fog of uncertainty, leading to delays in making important practice management decisions.

“When I get together with colleagues at national meetings, I get the sense that nobody really understands the future,” said Cam Patterson, MD, MBA, chief of the division of cardiology at the University of North Carolina at Chapel Hill.

That uncertainty “throws a wrench into the planning process,” including recruitment and benchmark setting, he told MedPage Today.

“It’s a major sea change,” added Thomas Tu, MD, director of the cardiac catheterization lab for the Louisville Cardiology Group in Louisville, Ky., who notes that physicians are “struggling” to find ways they can be influential in the new environment.

Patterson noted the plight of young cardiologists seeking jobs in a healthcare market unsure of how or when to make its next move.

“It’s challenging to hire new recruits when budgetary and human resources decisions are essentially on hold until there is a better understanding of what the ACA will bring,” he commented.

Regarding setting benchmarks, Patterson said the days of merely imagining your quality is as good as the next practice or hospital are gone.

Cold, hard data are the new norm, but which data and how best to collect and analyze them, as well as apply the results in a robust and meaningful way, are being worked out slowly.

“As with everyone else, we are scrambling to get a grip on what our quality measures are,” Patterson said.

Education and Prevention Will Be Key

Hospitalists, as well as advanced nurse practitioners and physician assistants, can help ease the workload due to the shortage of primary care providers, a shortage that is particularly acute in California, according to C. Noel Bairey Merz, MD, director of the Barbra Streisand Women’s Heart Center at Cedars-Sinai Medical Center in Los Angeles.

“If the reform happens the way it is intended, we should have an integrated healthcare system where primary prevention — management of hypertension, dyslipidemia, diabetes, smoking cessation counseling, and therapeutic lifestyle changes — is handled at the primary care level,” she said.

The truth of the matter, however, is that it takes twice as long to train the average general physician as it does an average nurse practitioner, and four times as long as the average physician assistant.

“It’s a lot to expect of physician extenders to practice primary care medicine,” Merz toldMedPage Today.

“A better system is the medical home model, with physician team leaders and physician extenders who work on protocols. The physician extenders would be licensed and would be able to work autonomously within a protocol,” she said.

Five years ago, the cardiology department at Geisinger Health Center in Danville, Pa., employed four nurse practitioners or clinical nurse specialists. Today, there are 12 and the department is seeking three more, according to James Blankenship, MD, vice president of the Society for Cardiovascular Angiography and Interventions, as well as an interventional cardiologist at Geisinger.

Blankenship also said that acknowledging the need for more primary care providers is to miss half of the equation. “We will need more specialists, as well.”

Given the newly insured patients coming into the system, as well as the aging Medicare population, cardiologists will be stretched pretty thin. But the field of cardiology has been instrumental in advocating teamwork among the different specialties for years, he said. “That’s a train that’s already on the tracks.”

Merz noted an expectation to see more cardiovascular care teams in response to the ACA. Such teams typically consist of a physician leader, nurse practitioners, pharmacists, behavioral experts, rehab professionals, and others.

These teams are vital for the care of high-risk patients such as survivors of angioplasty, bypass surgery, and heart failure, she said, especially since there aren’t enough cardiologists to do it all.

Echoing Blankenship, Merz said that cardiologists will probably be busier than ever as heart disease remains the leading killer among men and women as the population ages. She noted a decline in the most severe type of heart attack — ST-segment elevation MI, or STEMI — in the Medicare population, a decline that is likely multifactorial, but two reasons stand out as attributable to the decline — the use of low-dose aspirin and statin therapy for primary and secondary prevention, she said.

“At whatever level these medications are prescribed and managed — primary care physician, nurse practitioner, cardiologist — one thing is clear: they work and they should continue to be utilized at the front line of heart disease management,” Merz said.

Patients with chronic diseases already consume a great deal of healthcare resources. The other side of that coin is prevention, noted Kathy Berra, MSN, ANP, president of the Preventive Cardiovascular Nurses Association and a nurse at Stanford Prevention Research Center in Stanford, Calif.

“Prevention is a family affair. It’s been shown that when women take care of themselves, the health of the family improves.”

Emerging as one of the more important gatekeepers for women’s health — including cardiovascular health — are ob/gyns, Berra said.

Gynecologists have increased their efforts to quiz women about heart disease risk factors such as hypertension, high cholesterol, and diabetes. If red flags are apparent, patients can be referred to primary care providers, internal medicine physicians, or cardiologists.

“Ob/gyns are on the front line of women’s health. Perhaps under the ACA model, these specialists will have a closer relationship with cardiologists,” Berra told MedPage Today.

Regarding nurses and other care providers in hospitals, they need to be able to educate patients about how to take care of themselves post-discharge, how to understand the importance of their medications, and how to best re-connect with their nonhospital environment.

Readmission is at epidemic proportions and it can be reined in by patient education at the hospital level. Even pharmacists are getting more involved in patient education.

Scott & White Hospital in Temple, Texas, has a program that encourages adherence by waiving drug copays following an education session, according to James Rohack, MD, director of the Center for Healthcare Policy at Scott & White.

Patients on Seniorcare who are on five medications or more are asked if they want to participate in the program. If they agree, they meet with a pharmacist once a month for 15 to 30 minutes. The pharmacist goes over everything about the patient’s medication, listens to any concerns, and sends him or her home with new medications, waiving the copay.

“Having no copay is a great benefit for patients on fixed incomes, but it goes beyond that. A little bit of education goes a long way and if patients can be reminded once a month about the importance of taking their medications, we will have fewer hospitalizations,” Rohack said.

Accountable Care Organizations

The development of ACOs is probably one of the biggest challenges under the ACA, said Geisinger’s Blankenship.

The promise of ACOs is to have better integrated care, less fragmented care among various providers. Part of this integrated care involves incentives to minimize procedures that are either unnecessary or could be replaced with a less costly treatment.

“Having been under a fee-for-service model for a long time, some in cardiology might find the new paradigm challenging,” Blankenship suggested.

ACOs are supposed to help take the sting out of moving away from the fee-for-service model by providing the opportunity for better coordinated care — which should translate into a higher quality of care.

However, ACOs can be difficult to set up, especially from scratch, as they have a large startup cost, he said.

One of the most important aspects of an ACO is to have a solid network of primary care doctors. Patterson, at UNC Chapel Hill, said the uncertainty of whether his state will expand Medicaid has led to the “very aggressive acquisition of primary care practices.”

“The goal is to have enough physicians and patients so that we will have a low-cost ACO when we are ready to implement that model. We are going to need about 1 million patients to have an efficient ACO,” he said.

But there are also fears that the ACA will deluge cardiologists with paperwork.

“In the clinic, I spend as much time with paperwork as I do with patients — particularly with Medicare and Medicaid patients,” noted John Day, MD, director of Heart Rhythm Services at Intermountain Medical Center in Salt Lake City, Utah. “Many of us are worried we haven’t even seen the beginning of the deluge.”

The intrusion of paperwork and other government regulations tends to erode the time physicians get to spend with patients — “one of the primary reasons I wanted to be a doctor,” Day said.

In addition, Day said that he and many of his colleagues are disappointed that the ACA did not address malpractice concerns. “Perhaps it’s not so much what’s in the bill as what is not in the bill,” he said.

“Malpractice concerns are real; they scare me every day; it affects how you practice medicine. I don’t see how you can rein in costs without addressing the malpractice quagmire,” Day told MedPage Today.

Shifting Sands

“For those of us working in the trenches, we have a vague concept of the changes coming down the road,” said James A. de Lemos, MD, director of the coronary care unit at Parkland Memorial Hospital in Dallas.

“We seem to be too busy to think about the changes, which leads to one of my biggest worries — that I won’t have prepared my troops well enough,” he said.

From a clinical perspective, it’s business as usual, with de Lemos and colleagues focused on growth and the development of referrals and procedure services.

“We are concerned, however, that the entire paradigm is going to shift and what we’re building today might not be financially sound in the ACO model,” de Lemos told MedPage Today.

De Lemos, who is active in cardiovascular biomarker research, suggested that biomarkers will become more important in the ACA era of healthcare.

“It will no longer be prudent to send everyone with a complaint to a cardiologist,” he commented. “Biomarker screening may play a role as a triage method to separate out those who merit a trip to the cardiologist from those who can be treated by primary care doctors.”

Rohack made these suggestions for getting ready for the changes associated with the ACA:

  • Make sure you are actively aware of your quality measures, your individual quality measures.
  • When caring for uninsured adults, make sure you are aware of the potential benefits with health insurance exchanges, because they may qualify.
  • Make sure you are aware of impending deadlines regarding the implementation of certain aspects associated with electronic medical records because penalties can be assessed for missing deadlines.

 

Who Takes the Lead?

There are a lot of moving pieces that will contribute to finding success in the new era of healthcare and leaders must emerge to help forge pathways that others can follow. Hospitalists will be among those leaders, says Jeffrey H. Barsuk, MD, MS, a hospitalist and director of Simulation and Patient Safety for Graduate Medical Education at Northwestern University Feinberg School of Medicine in Chicago.

“At our hospital, we are probably the largest group of physicians involved in healthcare safety, quality, and reform,” he said.

The ACA, he told MedPage Today, is starting to have more of an impact on how he and his colleagues position themselves for the future.

In particular, the new bundled payment and fee-per-encounter models are ideal scenarios where hospitalists can make a difference by bridging gaps in the continuity of care and helping to shorten the length of stay without compromising quality.

Hospitalists can, for example, provide smoking cessation counseling for heart patients, discuss the importance of medication adherence, and check to ensure there are no contraindications to the medications or no potential for drug-drug adverse interactions.

Ultimately, though, clinicians at all levels, primary care practitioners and specialists, will need to work closely together because, as interventionalist Tu noted, government intervention that is not well thought out can backfire. The ACA might save money in the short run, Tu said, but in the long term, there is a great potential “to damage the care of patients and harm the profession of medicine. Already many good people don’t want to be in the field anymore.”

http://www.medpagetoday.com/Washington-Watch/Reform/40164?xid=nl_mpt_DHE_2013-06-29&utm_content=&utm_medium=email&utm_campaign=DailyHeadlines&utm_source=WC&eun=g406134d0r&userid=406134&email=serbangg@gmail.com&mu_id=5783576 

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Phrenic Nerve Stimulation in Patients with Cheyne-Stokes Respiration and Congestive Heart Failure

Writer: Larry H Bernstein, MD, FCAP

and

Curator: Aviva Lev-Ari, PhD, RN

Transvenous Phrenic Nerve Stimulation in Patients With Cheyne-Stokes Respiration and Congestive Heart Failure:A Safety and Proof-of-Concept Study

Xi-Long Zhang, MD; Ning Ding; Hong Wang; Ralph Augostini; Bing Yang; Di Xu; Weizhu Ju; Xiaofeng Hou; Xinli Li; Buqing Ni, PhD; Kejiang Cao; Isaac George; Jie Wang, MD, PhD; Shi-Jiang Zhang
Chest. 2012; 142(4):927-934. doi:10.1378/chest.11-1899
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Background:  Cheyne-Stokes respiration (CSR), which often occurs in patients with congestive heart failure (CHF), may be a predictor for poor outcome. Phrenic nerve stimulation (PNS) may interrupt CSR in patients with CHF. We report the clinical use of transvenous PNS in patients with CHF and CSR.

Methods:  Nineteen patients with CHF and CSR were enrolled. A single stimulation lead was placed at the junction between the superior vena cava and brachiocephalic vein or in the left-side pericardiophrenic vein. PNS stimulation was performed using Eupnea System device (RespiCardia Inc). Respiratory properties were assessed before and during PNS. PNS was assessed at a maximum of 10 mA.

Results:  Successful stimulation capture was achieved in 16 patients. Failure to capture occurred in three patients because of dislocation of leads. No adverse events were seen under maximum normal stimulation parameters for an overnight study. When PNS was applied following a series of central sleep apneic events, a trend toward stabilization of breathing and heart rate as well as improvement in oxygen saturation was seen. Compared with pre-PNS, during PNS there was a significant decrease in apnea-hypopnea index (33.8 ± 9.3 vs 8.1 ± 2.3, P = .00), an increase in mean and minimal oxygen saturation as measured by pulse oximetry (89.7% ± 1.6% vs 94.3% ± 0.9% and 80.3% ± 3.7% vs 88.5% ± 3.3%, respectively, all P = .00) and end-tidal CO2 (38.0 ± 4.3 mm Hg vs 40.3 ± 3.1 mm Hg, P = .02), but no significant difference in sleep efficiency (74.6% ± 4.1% vs 73.7% ± 5.4%, P = .36).

Conclusions:  The preliminary results showed that in a small group of patients with CHF and CSR, 1 night of unilateral transvenous PNS improved indices of CSR and was not associated with adverse events.

Trial registry:  ClinicalTrials.gov; No.: NCT00909259; URL: www.clinicaltrials.gov

http://journal.publications.chestnet.org/article.aspx?articleid=1215995

Transvenous phrenic nerve stimulation in patients with Cheyne-Stokes respiration and congestive heart failure: a safety and proof-of-concept study

Zhang Xi-Long; Ding N, Wang H, Augostini R, Yang B.
CHEST 2012; 142(4):927–934
Trial registry: ClinicalTrials.gov; No.: NCT00909259; URL: http://www.clinicaltrials.gov
http://dx.doi.org/10.1378/chest.11-1899

Introduction

Cheyne-Stokes respiration (CSR), a condition characterized by a cyclic pattern of waxing and waning ventilation interposed by central apneas or hypopneas, may affect up to 40% of patients with congestive heart failure (CHF).  Whether CSR is related to significantly increased morbidity and mortality 2 or has no impact on long-term survival in patients with CHF is controversial. Nevertheless, several investigators have reported that CSR might be an independent prognostic index of poor outcome in patients with CHF, so that Cheyne-Stokes respiration (CSR), which often occurs in patients with congestive heart failure (CHF), may be a predictor for poor outcome. CSR in patients with CHF is believed to be associated with a hypersensitivity to arterial CO 2 during sleep. The key pathophysiologic mechanism leading to all forms of periodic breathing is the oscillation of blood CO 2 level below and above the apneic threshold.  Clinically, these pathophysiologic changes may translate to sleep fragmentation, excessive daytime sleepiness, reduced exercise capacity, and, possibly, ventricular arrhythmias.
Current treatment options for CSR include medications, positive airway pressure devices such as adapt servo-ventilation, or oxygen therapy. Although all these therapies have shown benefi t in some patients, none has shown a consistent benefi t of suffi cient clinical magnitude to reduce mortality and morbidity. In the current study, we explored the initial feasibility, safety, and possible effects of unilateral, transvenous, synchronized PNS on CSR in 19 patients with CHF . This novel treatment resulted in a marked reduction of minute ventilation and possible improvement of CSR. The authors here suggest that phrenic nerve stimulation (PNS) may interrupt CSR in patients with CHF.

Study Population

 Nineteen patients with CHF and CSR were enrolled.  All study patients (N 5 19) had received a diagnosis of CSR and chronic CHF and were hospitalized in The First Affiliated Hospital of Nanjing Medical University (Nanjing, China). Of them, 12 with rheumatic cardiac valve disease were waiting forcardiac surgery, and seven (fi ve with dilated cardiomyopathy and two with hypertensive heart disease) were enrolled from the cardiology ward because of severe heart failure.
The inclusion criteria were aimed at identifying patients with symptoms or a diagnosed condition indicative of CSR who would tolerate the testing procedure. The patients continued on their standard medical regimen during participation, and in the case of an adverse event, medical treatment was at the discretion of the investigator. The inclusion criteria were as follows: (1) both patient and direct family member willingness to sign a Patient Ethics Committee-approved informed consent, (2) age > 18 years, (3) index CSR of > 15 times/h, (4) history of CHF with a left ventricle ejection fraction < 45%, and (5) ability to tolerate the study procedure and remain clinically stable for the duration of the study. Exclusion criteria were as follows: (1) baseline oxygen saturation <  90% on a stable FiO2 ; (2) evidence of phrenic nerve palsy; (3) temperature > 38.0°C; (4) inability to place stimulation lead (eg, coagulopathy, distorted anatomy, etc); (5) current enrollment in another clinical study that may confound the results of the present study; (6) no informed consent; (7) pregnancy or of childbearing potential without a negative pregnancy test within 10 days of the study procedure; (8) pacemaker, implantable cardioverter defibrillator, or cardiac resynchronization device; (9) severe COPD; (10) a history of myocardial infarction within 6 months prior to the study; and (11) unstable angina.

Study Design

 This short-term, prospective, open-label, nonrandomized feasibility study consisted of a treatment-only cohort in which each patient served as his or her own control. After patients were screened and enrolled in the study, PNS leads were placed through an interventional procedure for observation of 1 night only. During the 1-night study, we examined whether PNS caused pain, arousal during sleep, arrhythmia, changes in BP, and changes in either normal breathing or sleep apnea. We also examined the impact of PNS on central, obstructive, and mixed sleep apnea. Alterations in sleep apnea and hypopnea events were compared before and during PNS. “Before stimulation” was defined as the number of sleep apnea and hypopnea events occurring during a segment of 10 min just before delivery of PNS and served as the control for the effects of PNS. The total number of the 10-min segments before PNS, the total number of sleep apnea and hypopnea events occurred during the sum of the 10-min time were calculated,  then averaged (total number of sleep apnea and hypopnea events/total hours of the 10-min segments from all patients) and presented as the apnea-hypopnea index (AHI) for statistical analysis. AHI during PNS were also calculated and compared with AHI prior to PNS.

Sleep Study and Monitored Parameters

 All participants underwent a nocturnal, in-laboratory polysomnography (Embla S4500 PSG Amplifi er; Natus Medical Inc) and were monitored for at least 7 h overnight. The standard polysomnography recorded the EEG, bilateral electrooculograms, submental  electromyogram, ECG, chest and abdominal movement using respiratory effort bands, body position, nasal airflow using a pressure sensor, and oxygen saturation as measured by pulse oximetry (Sp o 2 ).
EEG, sleep staging, and arousals were monitored and scored using 30 epochs according to the method of Rechtschaffen and Kales. Classification of apnea and hypopnea was described by standard methodologies. CSR was identified as a special kind of CSA behaving as a cyclic pattern of periods of hyperventilation with waxing and waning tidal volumes alternating with periods of central hypopnea/apnea .

Lead Placement and PNS

A single stimulation lead was placed at the junction between the superior vena cava and brachiocephalic vein or in the left-side pericardiophrenic vein. PNS stimulation was performed using Eupnea System device (RespiCardia Inc). Respiratory properties were assessed before and during PNS. PNS was assessed at a maximum of 10 mA.

Results

Successful stimulation capture was achieved in 16 patients. Failure to capture occurred in three patients because of dislocation of leads. No adverse events were seen under maximum normal stimulation parameters for an overnight study.  No new arrhythmias, muscle contractions, arterial BP variations, pain, or unpleasant sensations were observed once PNS was delivered during sleep for these patients. It was confirmed that the catheter could be secured adequately to obtain consistent predictable stimulation thresholds without arousal from sleep. During occurrence of CSR, intermittent PNS signals were first confirmed to be successfully captured in 16 patients. When PNS was applied following a series of central sleep apneic events, a trend toward stabilization of breathing and heart rate.  An improvement in oxygen saturation and elevation of end-tidal CO2 was observed as longer continuous stimulation was performed. The period of stable breathing lasted as long as 10 to 20 min in some patients after stimulation.  They found that when electric connection to the nerve was consistent, stimulation resulted in a reduced hyperventilation followed by the reduction or elimination of CSR.
Compared with pre-PNS, during PNS there was a significant decrease in apnea-hypopnea index (33.8 ± 9.3 vs 8.1 ± 2.3, P = .00), an increase in mean and minimal oxygen saturation as measured by pulse oximetry (89.7% ± 1.6% vs 94.3% ± 0.9% and 80.3% ± 3.7% vs 88.5% ± 3.3%, respectively, all P = .00) and end-tidal CO2 (38.0 ± 4.3 mm Hg vs 40.3 ± 3.1 mm Hg, P = .02), but no significant difference in sleep efficiency (74.6% ± 4.1% vs 73.7% ± 5.4%, P = .36).

Discussion

CSR is characterized by cyclical oscillations of respiration and apnea. The incidence of CSR ranges from 10% to 20% in patients with stable CHF and up to 40% to 50% of all patients with New York Heart Association functional class III?IV CHF.  Nocturnal breathing alterations in patients with CHF are believed to be due to hypersensitivity to CO 2 during sleep. Breathing is controlled by a negative feedback system in which an increase in Pa co 2 stimulates breathing, whereas a decrease in Pa co 2 inhibits breathing. Normally, Pa co 2 is maintained within a narrow range. Patients with CHF and CSA have a more brisk ventilatory response to CO 2 than those without CSA.
The preliminary results showed that in a small group of patients with CHF and CSR, 1 night of unilateral transvenous PNS improved indices of CSR and was not associated with adverse events.
The study was performed using temporary catheters or leads in the right-side brachiocephalic vein, SVC, or left-side pericardiophrenic vein to transvenously stimulate the hemidiaphragm through either the leftside or the right-side phrenic nerve. To consistently stimulate the phrenic nerve using acceptable and safe current levels ( < 10 mA), the stimulation electrode needs to be within 2 to 5 mm from the phrenic nerve.  This type of stimulation caused significantly improved respiratory parameters in patients with CHF and further support that oscillation of CO 2 level in the blood below and above the apneic threshold is a central mechanism leading to the CSR pattern of breathing. Stabilization of CO 2 levels through PNS produced a regular breathing pattern, improvement in oxygen saturation, and fewer apneic events.
Dr.  Isaac George: contributed to data evaluation and drafting of the manuscript.

Related articles

Other related articles published on this Open Access Online Scientific Journal include the following:

Implantable Synchronized Cardiac Assist Device Designed for Heart Remodeling: Abiomed’s Symphony

Aviva Lev-Ari, PhD, RN, 7/11/2012

http://pharmaceuticalintelligence.com/2012/07/11/implantable-synchronized-cardiac-assist-device-designed-for-heart-remodeling-abiomeds-symphony/

Biomaterials Technology: Models of Tissue Engineering for Reperfusion and Implantable Devices for Revascularization

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http://pharmaceuticalintelligence.com/5_04_2013/bernstein_lev-ari/Bioengineering_of_Vascular_and_Tissue_Models

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Evidence for Overturning the Guidelines in Cardiogenic Shock

Clinical Indications for Use of Inhaled Nitric Oxide (iNO) in the Adult Patient Market: Clinical Outcomes after Use, Therapy Demand and Cost of Care

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Diagnosis of Cardiovascular Disease, Treatment and Prevention: Current & Predicted Cost of Care and the Promise of Individualized Medicine Using Clinical Decision Support Systems

Justin Pearlman MD ME PhD MA FACC, Larry H Bernstein, MD, FCAP and Aviva Lev-Ari, PhD, RN

http://pharmaceuticalintelligence.com/2013/05/15/diagnosis-of-cardiovascular-disease-treatment-and-prevention-current-predicted-cost-of-care-and-the-promise-of-individualized-medicine-using-clinical-decision-support-systems-2/

Visualisation of Cheyne-Stokes respiration

Visualisation of Cheyne-Stokes respiration (Photo credit: Wikipedia)

Cheyne-Stokes respiration

Cheyne-Stokes respiration (Photo credit: Wikipedia)

Cheyne-Stokes respiration

Cheyne-Stokes respiration (Photo credit: Wikipedia)

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