The role of AMPKα2 in the HFD-induced nonalcoholic steatohepatitis.

The role of AMPKα2 in the HFD-induced nonalcoholic steatohepatitis.
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AMPKα2 在 HFD 诱导的非酒精性脂肪性肝炎中的作用。

DOI:
10.1016/j.bbadis.2020.165854
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发表时间:
2020-06
期刊:
Biochim Biophys Acta Mol Basis Dis.
影响因子:
--
通讯作者:
Niu W
Niu W
中科院分区:
其他
文献类型:
--
作者:
Zhang X;Liu S;Zhang C;Zhang S;Yue Y;Zhang Y;Chen L;Yao Z;Niu W

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非酒精性脂肪性肝病(NAFLD)与肝脏脂肪变性、炎症和肝纤维化有关,已成为肝细胞癌和肝功能衰竭的主要原因之一。然而,肝脂肪变性的潜在分子机制和进展为非酒精性脂肪性肝炎(NASH)尚未完全了解。在此,我们发现AMPKα2催化亚基在高脂饮食(HFD)喂养小鼠后在肝脏中的表达降低。重要的是,敲除AMPKα2可加重NAFLD、肝脂肪变性、炎症和纤维化。另一方面,肝细胞靶向过表达AMPKα2可预防或逆转NAFLD适应症。体内机制研究显示,与WT小鼠相比,喂食HFD的AMPKα2−/−小鼠中IKKα/β和NF-κB的磷酸化增加,并且用NF-κB信号传导抑制剂处理这些小鼠队列4周,有效地减弱了脂肪性肝炎和代谢紊乱特征的进展。总之,AMPKα2通过抑制肝脏NF-κB信号传导,在肝脏脂肪变性向NASH进展的过程中发挥保护作用。
Nonalcoholic fatty liver disease (NAFLD) is associated with hepatic steatosis, inflammation and liver fibrosis and has become one of the leading causes of hepatocellular carcinoma and liver failure. However, the underlying molecular mechanism of hepatic steatosis and the progression to nonalcoholic steatohepatitis (NASH) are not fully understood. Herein, we discovered that AMPKα2 catalytic subunit showed reduced expression in the liver following high fat diet (HFD) feeding to mice. Importantly, knockout of AMPKα2 in mice aggravated NAFLD, hepatic steatosis, inflammation and fibrosis. On the other hand, hepatocyte-targeted overexpression of AMPKα2 prevented or reversed NAFLD indications. In vivo mechanistic studies revealed that increased phosphorylation of IKKα/β and NF-κB in HFD-fed AMPKα2−/−mice compared to WT mice, and treatment of these mouse cohorts with an inhibitor of NF-κB signaling for 4 weeks, effectively attenuated the progression of steatohepatitis and metabolic disorder features. In summary, AMPKα2 provides a protective role in the process of hepatic steatosis to NASH progression through suppression of liver NF-κB signaling.
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