LncRNA SRA promotes hepatic steatosis through repressing the expression of adipose triglyceride lipase (ATGL).

LncRNA SRA promotes hepatic steatosis through repressing the expression of adipose triglyceride lipase (ATGL).
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DOI:
10.1038/srep35531
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发表时间:
2016-10-19
期刊:
影响因子:
4.6
通讯作者:
Sheng L
Sheng L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chen G;Yu D;Nian X;Liu J;Koenig RJ;Xu B;Sheng L

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非酒精性脂肪性肝病(NAFLD)是慢性肝病的最常见形式,表现为肝脏脂肪的过度积累。我们最近已经表明,基因敲除长非编码RNA(lncRNA)类固醇受体RNA激活剂(SRA)(SRAKO)的小鼠对高脂饮食诱导的肥胖具有抗性,其表型包括改善的葡萄糖耐量和减弱的肝脂肪变性。本研究探讨了其潜在的机制。我们发现,在小鼠中,肝脏SRA和脂肪甘油三酯脂肪酶(ATGL)(一种主要的肝脏三酰甘油(TAG)水解酶)的水平受禁食的负调控,并且在正常和高脂饮食(HFD)喂养下,肝脏ATGL的表达被SRAKO诱导。原代肝细胞或肝细胞系中SRA的缺失上调,但SRA的强制表达抑制ATGL表达和游离脂肪酸(FFA)β-氧化。SRA抑制ATGL启动子活性,主要是通过抑制转录因子叉头盒蛋白O 1(FoxO 1)的其他诱导作用。我们的数据揭示了SRA通过抑制ATGL表达促进肝脂肪变性的新功能。
Nonalcoholic fatty liver disease (NAFLD), the most common form of chronic liver disease, manifests as an over-accumulation of hepatic fat. We have recently shown that mice with genetic knockout of a long non-coding RNA (lncRNA) steroid receptor RNA activator (SRA) (SRAKO) are resistant to high fat diet-induced obesity with a phenotype that includes improved glucose tolerance and attenuated hepatic steatosis. The underlying mechanism was investigated in the present study. We found that hepatic levels of SRA and adipose triglyceride lipase (ATGL), a major hepatic triacylglycerol (TAG) hydrolase, were inversely regulated by fasting in mice, and the expression of liver ATGL was induced by SRAKO under normal and high fat diet (HFD) feeding. Loss of SRA in primary hepatocytes or a hepatocyte cell line upregulates, but forced expression of SRA inhibits ATGL expression and free fatty acids (FFA) β-oxidation. SRA inhibits ATGL promoter activity, primarily by inhibiting the otherwise-inductive effects of the transcription factor, forkhead box protein O1 (FoxO1). Our data reveal a novel function of SRA in promoting hepatic steatosis through repression of ATGL expression.
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