LncRNA Kcnq1ot1 Promotes Lipid Accumulation and Accelerates Atherosclerosis Via Functioning As a CeRNA Through the MiR-452-3p/HDAC3/ABCA1 Axis

Overview

Journal Cell Death Dis

Specialties Cell Biology
General Medicine

Date 2020 Dec 9

PMID 33293505

Citations 45

Authors

Xiao-Hua Yu

Wen-Yi Deng

Jiao-Jiao Chen

Xiao-Dan Xu

Xian-Xia Liu

Lei Chen

Meng-Wen Shi

Qi-Xian Liu

Min Tao

Kun Ren

Affiliations

Soon will be listed here.

Abstract

Kcnq1 overlapping transcript 1 (kcnq1ot1), an imprinted antisense lncRNA in the kcnq1 locus, acts as a potential contributor to cardiovascular disease, but its role in atherosclerosis remains unknown. The aim of this study was to explore the effects of kcnq1ot1 on atherogenesis and the underlying mechanism. Our results showed that kcnq1ot1 expression was significantly increased in mouse aorta with atherosclerosis and lipid-loaded macrophages. Lentivirus-mediated kcnq1ot1 overexpression markedly increased atherosclerotic plaque area and decreased plasma HDL-C levels and RCT efficiency in apoE mice fed a Western diet. Upregulation of kcnq1ot1 also reduced the expression of miR-452-3p and ABCA1 but increased HDAC3 levels in mouse aorta and THP-1 macrophages. Accordingly, kcnq1ot1 overexpression inhibited cholesterol efflux and promoted lipid accumulation in THP-1 macrophages. In contrast, kcnq1ot1 knockdown protected against atherosclerosis in apoE mice and suppressed lipid accumulation in THP-1 macrophages. Mechanistically, kcnq1ot1 enhanced HDAC3 expression by competitively binding to miR-452-3p, thereby inhibiting ABCA1 expression and subsequent cholesterol efflux. Taken together, these findings suggest that kcnq1ot1 promotes macrophage lipid accumulation and accelerates the development of atherosclerosis through the miR-452-3p/HDAC3/ABCA1 pathway.

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