The Nuclear Orphan Receptor NR2F6 Promotes Hepatic Steatosis through Upregulation of Fatty Acid Transporter CD36.

The Nuclear Orphan Receptor NR2F6 Promotes Hepatic Steatosis through Upregulation of Fatty Acid Transporter CD36.
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核孤儿受体 NR2F6 通过上调脂肪酸转运蛋白 CD36 促进肝脂肪变性

DOI:
10.1002/advs.202002273
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发表时间:
2020-11
期刊:
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
影响因子:
--
通讯作者:
Lu Y
Lu Y
中科院分区:
其他
文献类型:
--
作者:
Zhou B;Jia L;Zhang Z;Xiang L;Yuan Y;Zheng P;Liu B;Ren X;Bian H;Xie L;Li Y;Lu J;Zhang H;Lu Y

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核受体 (NR) 是转录因子的超家族,可感知激素信号或营养物质以调节各种生物事件,包括发育、繁殖和代谢。本研究确定核受体亚家族 2 F 组成员 6 (NR2F6) 是肝脏甘油三酯 (TG) 稳态的重要调节因子,也是非酒精性脂肪肝 (NAFLD) 发展的致病因素。腺相关病毒(AAV)介导的NR2F6在肝脏中过度表达可促进瘦小鼠的TG积累,而肝脏特异性抑制NR2F6可改善肥胖相关的肝脂肪变性、胰岛素抵抗以及蛋氨酸和胆碱缺乏(MCD)饮食诱发的非酒精性脂肪性肝炎(NASH)。从机制上讲,脂肪酸转位酶 CD36 被确定为 NR2F6 的转录靶标,以介导其脂肪变性作用。 NR2F6 能够直接结合到肝细胞中的 CD36 启动子区域,并增加核受体辅激活因子 1 (SRC-1) 的富集和其启动子处的组蛋白乙酰化。具有病理生理学意义的是,NR2F6 在肥胖小鼠和 NAFLD 患者的肝脏中显着上调。此外,二甲双胍治疗可降低肥胖小鼠的 NR2F6 表达,从而抑制 CD36 并降低肝脏 TG 含量。因此,这些结果为 NR2F6 导致肝脏脂肪变性的不可预测的作用提供了证据,并表明 NR2F6 拮抗剂可能提供逆转或治疗 NAFLD/NASH 发病机制的治疗策略。
Nuclear receptors (NRs) are a superfamily of transcription factors which sense hormonal signals or nutrients to regulate various biological events, including development, reproduction, and metabolism. Here, this study identifies nuclear receptor subfamily 2, group F, member 6 (NR2F6), as an important regulator of hepatic triglyceride (TG) homeostasis and causal factor in the development of non‐alcoholic fatty liver disease (NAFLD). Adeno‐associated virus (AAV)‐mediated overexpression of NR2F6 in the liver promotes TG accumulation in lean mice, while hepatic‐specific suppression of NR2F6 improves obesity‐associated hepatosteatosis, insulin resistance, and methionine and choline‐deficient (MCD) diet‐induced non‐alcoholic steatohepatitis (NASH). Mechanistically, the fatty acid translocase CD36 is identified as a transcriptional target of NR2F6 to mediate its steatotic role. NR2F6 is able to bind directly onto the CD36 promoter region in hepatocytes and increases the enrichment of nuclear receptor coactivator 1 (SRC‐1) and histone acetylation at its promoter. Of pathophysiological significance, NR2F6 is significantly upregulated in the livers of obese mice and NAFLD patients. Moreover, treatment with metformin decreases NR2F6 expression in obese mice, resulting in suppression of CD36 and reduced hepatic TG contents. Therefore, these results provide evidence for an unpredicted role of NR2F6 that contributes to liver steatosis and suggest that NR2F6 antagonists may present a therapeutic strategy for reversing or treating NAFLD/NASH pathogenesis.
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