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首页> 外文期刊>Cell metabolism >Cholesterol Stabilizes TAZ in Hepatocytes to Promote Experimental Non-alcoholic Steatohepatitis
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Cholesterol Stabilizes TAZ in Hepatocytes to Promote Experimental Non-alcoholic Steatohepatitis

机译:胆固醇稳定肝细胞的TAZ,以促进实验性非酒精脱脂性肝炎

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摘要

Incomplete understanding of how hepatosteatosis transitions to fibrotic non-alcoholic steatohepatitis (NASH) has limited therapeutic options. Two molecules that are elevated in hepatocytes in human NASH liver are cholesterol, whose mechanistic link to NASH remains incompletely understood, and TAZ, a transcriptional regulator that promotes fibrosis but whose mechanism of increase in NASH is unknown. We now show that increased hepatocyte cholesterol upregulates TAZ and promotes fibrotic NASH. ASTER-B/Cmediated internalization of plasma membrane cholesterol activates soluble adenylyl cyclase (sAC; ADCY10), triggering a calcium-RhoA-mediated pathway that suppresses b-TrCP/proteasome-mediated TAZ degradation. In mice fed with a cholesterol-rich NASH-inducing diet, hepatocyte-specific silencing of ASTER-B/C, sAC, or RhoA decreased TAZ and ameliorated fibrotic NASH. The cholesterol-TAZ pathway is present in primary human hepatocytes, and associations among liver cholesterol, TAZ, and RhoA in human NASH liver are consistent with the pathway. Thus, hepatocyte cholesterol contributes to fibrotic NASH by increasing TAZ, suggesting new targets for therapeutic intervention.
机译:对肝脂肪变性如何转变为纤维性非酒精性脂肪性肝炎(NASH)的不完全理解限制了治疗选择。在人类NASH肝脏中,两种在肝细胞中升高的分子是胆固醇,其与NASH的机制尚不完全清楚,以及TAZ,一种促进纤维化的转录调节因子,但其NASH增加的机制尚不清楚。我们现在发现,肝细胞胆固醇增加会上调TAZ,促进纤维化NASH。ASTER-B/C介导的质膜胆固醇内化激活可溶性腺苷酸环化酶(sAC;ADCY10),触发钙RhoA介导的途径,抑制B-TrCP/蛋白酶体介导的TAZ降解。在喂食高胆固醇NASH诱导饮食的小鼠中,肝细胞特异性沉默ASTER-B/C、sAC或RhoA可降低TAZ并改善纤维化NASH。胆固醇TAZ途径存在于原代人类肝细胞中,人类NASH肝脏中肝脏胆固醇、TAZ和RhoA之间的关联与该途径一致。因此,肝细胞胆固醇通过增加TAZ而导致纤维化NASH,提示治疗干预的新目标。

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