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Macrophage miR-34a Is a Key Regulator of Cholesterol Efflux and Atherosclerosis.
Molecular Therapy ( IF 12.1 ) Pub Date : 2019-09-12 , DOI: 10.1016/j.ymthe.2019.09.008
Yanyong Xu 1 , Yang Xu 1 , Yingdong Zhu 1 , Huihui Sun 1 , Cody Juguilon 1 , Feng Li 2 , Daping Fan 3 , Liya Yin 1 , Yanqiao Zhang 1
Affiliation  

Macrophages play a crucial role in the pathogenesis of atherosclerosis, but the molecular mechanisms remain poorly understood. Here we show that microRNA-34a (miR-34a) is a key regulator of macrophage cholesterol efflux and reverse cholesterol transport by modulating ATP-binding cassette transporters ATP-binding cassette subfamily A member 1 (ABCA1) and ATP-binding cassette subfamily G member 1 (ABCG1). miR-34a also regulates M1 and M2 macrophage polarization via liver X receptor α. Furthermore, global loss of miR-34a reduces intestinal cholesterol or fat absorption by inhibiting cytochrome P450 enzymes CYP7A1 and sterol 12α-hydroxylase (CYP8B1). Consistent with these findings, macrophage-selective or global ablation of miR-34a markedly inhibits the development of atherosclerosis. Finally, therapeutic inhibition of miR-34a promotes atherosclerosis regression and reverses diet-induced metabolic disorders. Our studies outline a central role of miR-34a in regulating macrophage cholesterol efflux, inflammation, and atherosclerosis, suggesting that miR-34a is a promising target for treatment of cardiometabolic diseases.

中文翻译:

巨噬细胞 miR-34a 是胆固醇流出和动脉粥样硬化的关键调节剂。

巨噬细胞在动脉粥样硬化的发病机制中起着至关重要的作用,但其分子机制仍知之甚少。在这里,我们表明 microRNA-34a (miR-34a) 是巨噬细胞胆固醇流出和反向胆固醇转运的关键调节因子,通过调节 ATP 结合盒转运蛋白 ATP 结合盒亚科 A 成员 1 (ABCA1) 和 ATP 结合盒亚科 G 成员1 (ABCG1)。miR-34a 还通过肝 X 受体 α 调节 M1 和 M2 巨噬细胞极化。此外,miR-34a 的整体损失通过抑制细胞色素 P450 酶 CYP7A1 和甾醇 12α-羟化酶 (CYP8B1) 来降低肠道胆固醇或脂肪吸收。与这些发现一致,miR-34a 的巨噬细胞选择性或全局消融显着抑制动脉粥样硬化的发展。最后,miR-34a的治疗性抑制促进动脉粥样硬化消退并逆转饮食诱导的代谢紊乱。我们的研究概述了 miR-34a 在调节巨噬细胞胆固醇流出、炎症和动脉粥样硬化中的核心作用,表明 miR-34a 是治疗心脏代谢疾病的有希望的靶点。
更新日期:2019-09-12
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