Cardiac Hypertrophy-Associated Transcript (CHAST) as a potential lncRNA candidate that influences Cardiomyocyte Hypertrophy
Reporter: Aviva Lev-Ari, PhD, RN
Sci Transl Med. 2016 Feb 17;8(326):326ra22. doi: 10.1126/scitranslmed.aaf1475.
Long noncoding RNA Chast promotes cardiac remodeling.
Viereck J1, Kumarswamy R2, Foinquinos A2, Xiao K2, Avramopoulos P3, Kunz M4, Dittrich M5, Maetzig T6, Zimmer K2, Remke J2, Just A2, Fendrich J2, Scherf K2, Bolesani E7, Schambach A6, Weidemann F8, Zweigerdt R7, de Windt LJ9, Engelhardt S3, Dandekar T4, Batkai S2, Thum T10.
Recent studies highlighted long noncoding RNAs (lncRNAs) to play an important role in cardiac development. However, understanding of lncRNAs in cardiac diseases is still limited. Global lncRNA expression profiling indicated that several lncRNA transcripts are deregulated during pressure overload-induced cardiac hypertrophy in mice. Using stringent selection criteria, we identified Chast (cardiac hypertrophy-associated transcript) as a potential lncRNA candidate that influences cardiomyocyte hypertrophy. Cell fractionation experiments indicated that Chast is specifically up-regulated in cardiomyocytes in vivo in transverse aortic constriction (TAC)-operated mice. In accordance, CHAST homolog in humans was significantly up-regulated in hypertrophic heart tissue from aortic stenosis patients and in human embryonic stem cell-derived cardiomyocytes upon hypertrophic stimuli. Viral-based overexpression of Chast was sufficient to induce cardiomyocyte hypertrophy in vitro and in vivo. GapmeR-mediated silencing of Chast both prevented and attenuated TAC-induced pathological cardiac remodeling with no early signs on toxicological side effects. Mechanistically, Chast negatively regulated Pleckstrin homology domain-containing protein family M member 1 (opposite strand of Chast), impeding cardiomyocyte autophagy and driving hypertrophy. These results indicate that Chast can be a potential target to prevent cardiac remodeling and highlight a general role of lncRNAs in heart diseases.
Copyright © 2016, American Association for the Advancement of Science.