p62/SQSTM1 by Binding to Vitamin D Receptor Inhibits Hepatic Stellate Cell Activity, Fibrosis, and Liver Cancer.

p62/SQSTM1 by Binding to Vitamin D Receptor Inhibits Hepatic Stellate Cell Activity, Fibrosis, and Liver Cancer.
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P62/SQSTM1与维生素D受体结合抑制肝星细胞活性,纤维化和肝癌。

DOI:
10.1016/j.ccell.2016.09.004
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发表时间:
2016-10-10
期刊:
影响因子:
50.3
通讯作者:
Moscat J
Moscat J
中科院分区:
医学1区
文献类型:
--
作者:
Duran A;Hernandez ED;Reina-Campos M;Castilla EA;Subramaniam S;Raghunandan S;Roberts LR;Kisseleva T;Karin M;Diaz-Meco MT;Moscat J

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肝星状细胞(HSC)在肝纤维化和肝细胞癌(HCC)中起关键作用。维生素D受体(VDR)在HSC中的激活抑制肝脏炎症和纤维化。我们发现p62/SQSTM1,一种在肝实质细胞中上调但在hcc相关的HSC中下调的蛋白,负性地控制HSC的激活。全身或HSC特异性p62消融术增强HSC并促进炎症、纤维化和HCC进展。p62直接与VDR和RXR相互作用,促进其异源二聚化,这对VDR:RXR靶基因募集至关重要。在HSC中p62的缺失损害了VDR激动剂对纤维化和炎症的抑制。这表明p62是肝脏炎症和纤维化的负调节因子,通过其在HSC中促进VDR信号的能力,其激活支持HCC。
Hepatic stellate cells (HSC) play critical roles in liver fibrosis and hepatocellular carcinoma (HCC). Vitamin D receptor (VDR) activation in HSC inhibits liver inflammation and fibrosis. We found that p62/SQSTM1, a protein upregulated in liver parenchymal cells but downregulated in HCC-associated HSC, negatively controls HSC activation. Total body or HSC-specific p62 ablation potentiates HSC and enhances inflammation, fibrosis and HCC progression. p62 directly interacts with VDR and RXR promoting their heterodimerization, which is critical for VDR:RXR target gene recruitment. Loss of p62 in HSC impairs the repression of fibrosis and inflammation by VDR agonists. This demonstrates that p62 is a negative regulator of liver inflammation and fibrosis through its ability to promote VDR signaling in HSC, whose activation supports HCC.
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