Wang Minghui, Liu Yujie, Li Chao, Zhang Ying, Zhou Xiujun, Lu Chengzhi
Tianjin Medical University Tianjin 300070, China.
Department of Cardiology, Tianjin Chest Hospital Tianjin 300222, China.
Am J Transl Res. 2019 Mar 15;11(3):1827-1834. eCollection 2019.
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.
越来越多的研究表明长链非编码RNA(lncRNAs)在人类心血管疾病,尤其是动脉粥样硬化中所起的作用。迄今为止,lncRNA OIP5-AS1调节氧化型低密度脂蛋白(ox-LDL)介导的内皮细胞凋亡的机制仍不清楚。本研究结果发现,在给予ox-LDL的人脐静脉内皮细胞(HUVECs)中,lncRNA OIP5-AS1显著过表达。沉默OIP5-AS1可通过诱导G0/G1期阻滞抑制细胞凋亡并促进细胞增殖。染色质免疫沉淀(ChIP)显示,lncRNA OIP5-AS1通过招募EZH2来降低GSK-3β的表达,EZH2是多梳抑制复合物2(PRC2)的关键元件,可直接与GSK-3β启动子区域结合。拯救实验证实,GSK-3β可消除OIP5-AS1对HUVECs的影响。总体而言,这些发现表明lncRNA OIP5-AS1通过招募EZH2靶向GSK-3β,加速ox-LDL介导的血管内皮细胞凋亡,为动脉粥样硬化提供了潜在的治疗策略。