Down-regulation of mir-542-3p promotes neointimal formation in the aging rat

AimTo explore mir-542-3p mediated inhibition of vascular smooth muscle cell (VSMC) proliferation through the inhibition of Syk activation.Methods and ResultsMicroRNA (mir)-542-3p was selected for analysis based on miRNA microarray and qRT-PCR results. In vitro mir-542-3p expression was significantly downregulated in old (o)VSMCs compared with young (y)VSMCs under serum stimulation conditions. Upregulation of mir-542-3p in oVSMCs significantly inhibited VSMC proliferation, whereas downregulation of mir-542-3p in yVSMCs increased VSMC proliferation. We identified spleen tyrosine kinase (Syk) as a direct target of mir-542-3p by database search, and showed that its expression and phosphorylation were higher in oVSMCs than in yVSMCs after serum stimulation. Luciferase assays confirmed that Syk is a direct target of miR-3542-3p. Knock-down of mir-542-3p in yVSMCs inhibited the activation of the Syk downstream effectors STAT3 and STAT5, whereas mir-542-3p overexpression enhanced STAT3 and STAT5 activities. In a rat balloon injury model, mir-542-3p inhibited neointima formation and proliferating cell nuclear antigen (PCNA) protein expression.ConclusionMir-542-3p modulates VSMC proliferation via the Syk/STAT3-STAT5 axis. Downregulation of mir-542-3p may explain age-related neointimal hyperplasia in rats.

In old VSMCs, down-regulation of mir-542-3p induced by aging contributed to increasing Syk and p-Syk expression, which in turn activating phosphorylation of STAT3 and STAT5, stimulated VSMCs proliferation.Figure optionsDownload high-quality image (134 K)Download as PowerPoint slide