An increasing amount of research is demonstrating the role of long noncoding RNAs (lncRNAs) in human cardiovascular disease, and in particular, atherosclerosis. To date, the mechanism through which lncRNA OIP5-AS1 regulates the oxidative low-density lipoprotein (ox-LDL)-mediated endothelial cell apoptosis is still unclear. Results from this study found that lncRNA OIP5-AS1 was significantly over-expressed in the human umbilical vein endothelial cells (HUVECs) administered with ox-LDL. The silencing of OIP5-AS1 inhibited apoptosis and promoted proliferation via inducing G0/G1 cycle arrest. Chromatin immunoprecipitate (ChIP) revealed that lncRNA OIP5-AS1 reduced GSK-3β expression through recruiting EZH2, a critical element of the Polycomb Repressive Complex 2 (PRC2) complex that directly bind with the GSK-3β promoter region. Rescue experiments validated that GSK-3β could eliminate the effect of OIP5-AS1 on HUVECs. Overall, these findings suggest that lncRNA OIP5-AS1 accelerates ox-LDL mediated vascular endothelial cell apoptosis through targeting GSK-3β via recruiting EZH2, providing potential therapeutic strategies for atherosclerosis.
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