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Role of microRNA-124 in cardiomyocyte hypertrophy inducedby angiotensin II
Corresponding Author(s) : X. Liu
liuxq@scu.edu.cn
Cellular and Molecular Biology,
Vol. 63 No. 4: Cell biology, biophysics, and mechanobiology: From the basics to Clinics
Abstract
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.
Keywords
miR-124
Cardiac hypertrophy
Angiotensin II
ER stress.
Bao, Q., Chen, L., Li, J., Zhao, M., Wu, S., Wu, W., & Liu, X. (2017). Role of microRNA-124 in cardiomyocyte hypertrophy inducedby angiotensin II. Cellular and Molecular Biology, 63(4), 23–27. https://doi.org/10.14715/cmb/2017.63.4.4
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