MiR-133b-3p attenuates angiotensin II-induced cardiac hypertrophy through the inhibition of apoptosis by targeting CDIP1.

MicroRNAs (miRNAs) have emerged as essential regulators that play important roles in the development of multiple systems. Recent studies have identified significant roles for miRNAs in the progression of cardiac hypertrophy. This study aims to investigate the effects of miR-133b-3p on angiotensin II (Ang II)-induced cardiac hypertrophy and apoptosis, as well as explore its underlying mechanisms. Our experimental results reveal that miR-133b-3p expression is significantly decreased in both animal and cell models of cardiac hypertrophy induced by Ang II. Overexpression of miR-133b-3p reverses the hypertrophic manifestations and apoptosis induced by Ang II. Through bioinformatics analysis and dual-luciferase reporter assays, CDIP1 (cell death inducing p53 target 1) is identified as a direct target of miR-133b-3p, and the overexpression of miR-133b-3p reduces CDIP1 expression. Additionally, CDIP1 silencing suppresses cardiomyocyte hypertrophy and apoptosis induced by Ang II. In summary, these results suggest that miR-133b-3p may serve as a potential diagnostic marker for cardiac hypertrophy and that the upregulation of miR-133b-3p inhibits cardiac hypertrophy by targeting CDIP1.