TY - JOUR AU - Bao, Q. AU - Chen, L. AU - Li, J. AU - Zhao, M. AU - Wu, S. AU - Wu, W. AU - Liu, X. PY - 2017/04/29 Y2 - 2024/03/29 TI - Role of microRNA-124 in cardiomyocyte hypertrophy inducedby angiotensin II JF - Cellular and Molecular Biology JA - Cell Mol Biol (Noisy-le-grand) VL - 63 IS - 4 SE - Original Research Articles DO - 10.14715/cmb/2017.63.4.4 UR - https://www.cellmolbiol.org/index.php/CMB/article/view/1433 SP - 23-27 AB - Cardiac hypertrophy is a crucial predictor of heart failure and is regulated by microRNAs. MicroRNA-124 (miR-124) is regarded as a prognostic indicator for outcomes after cardiac arrest. However, whether miR-124 participates in cardiac hypertrophy remains unclear. Therefore, our study aimed to determine the role of miR-124 in angiotensin II(AngII)-induced myocardial hypertrophy and the possible mechanism. Primary cultured rat neonatal cardiomyocytes(NCMs) were transfected with miR-124 mimics or inhibitor, followed by AngII stimulation. Quantitative RT-PCR, western blot analysis and determination of cell surface area of NCMs were used to detect the hypertrophic phenotypes. We observed that miR-124 was elevated in AngII-induced hypertrophic cardiomyocytes. Cell surface area of NCMs and mRNA expression of atrial natriuretic peptide (ANP), brain natriuretic peptide (BNP) and β-myosin heavy chain (β-MHC), indicators of myocardial hypertrophy, were higher in NCMs transfected with miR-124 mimics in the presence of AngII. On the contrary, knockdown of miR-124 by its specific inhibitor could restore these courses. Furthermore, downregulation of miR-124 alleviated the increased protein level of endoplasmic reticulum (ER) stress markers 78-kDa glucose-regulated protein (Grp78) and calreticulin(CRT) in AngII-induced NCMs. In conclusion, our study shows that inhibition of miR-124 effectively suppresses AngII-induced myocardial hypertrophy, which is associated with attenuation of ER stress. ER -