Effects of MicroRNA-24 on Myocardial Fibrosis in Rats After Myocardial Infarction by Targeting Wnt Family Member 4/Dvl-1/β-Catenin Signaling Pathway

In this study, we investigated the impact of miR-24 on myocardial fibrosis severity in rats following myocardial infarction (MI) and explored its underlying mechanisms. We established an MI-induced myocardial fibrosis rat model and assessed cardiac function via echocardiography. We employed Western blotting and RT-qPCR to examine the effects of agomiR-24 on key fibrotic markers, including COL1A1, COL3A1, and α -SMA. Microarray analysis, pathway enrichment, and proteinprotein interaction network analysis revealed the signaling pathways and genes influenced by agomiR-24. Primary rat cardiac fibroblasts (CFs) were isolated, and miR-24’s direct target was confirmed using luciferase reporter assays. We modulated miR-24 expression in CFs and assessed cell proliferation and invasion through CCK-8 and Transwell assays, respectively. Furthermore, we investigated the impact of miR-24 on the Wnt4/Dvl-1/ β -catenin signaling pathway by Western blotting. Finally, we examined mRNA expression levels of key genes (Cyclin D1, p27, p21, MMP-3, and MMP-9) through RT-qPCR. Our findings demonstrated that agomiR-24 improved cardiac function and reduced fibrotic marker expression in rat myocardial tissues. MiR-24 inhibited CF proliferation and invasion, potentially by targeting Wnt4/Dvl-1/ β - catenin signaling. It also regulated mRNA expression of genes associated with cell proliferation and matrix remodeling. Overall, our study suggests that miR-24 may attenuate myocardial fibrosis in post-MI rats by suppressing the Wnt4/Dvl- 1/ β -catenin pathway.