Hepatitis C virus-induced furin and thrombospondin-1 activate TGF-β1: role of TGF-β1 in HCV replication.

Hepatitis C virus-induced furin and thrombospondin-1 activate TGF-β1: role of TGF-β1 in HCV replication.
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DOI:
10.1016/j.virol.2010.12.051
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发表时间:
2011-04-10
期刊:
影响因子:
3.7
通讯作者:
Waris G
Waris G
中科院分区:
医学3区
文献类型:
--
作者:
Presser LD;Haskett A;Waris G

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在这项研究中,我们证明了 HCV (JFH-1) 感染细胞中 TGF-β1 诱导以及蛋白水解激活的分子机制。我们的研究表明,HCV 感染细胞中 TGF-β1 的合成和分泌在 Ca2+ 螯合剂、线粒体 Ca2+ 摄取抑制剂和抗氧化剂的存在下减少。我们还通过基于细胞的荧光素酶测定表明,HCV NS 蛋白 NS3/4A 和 NS5A 的表达可以诱导 TGF-β1。此外,突变分析表明,NS3 的功能活性蛋白酶结构域和 NS5A 的 N 末端结构域是 TGF-β1 活性所必需的。使用 siRNA 方法,我们证明 HCV 诱导的弗林蛋白酶和血小板反应蛋白-1 (TSP-1) 参与 TGF-β1 的蛋白水解激活。我们的结果还表明 TGF-β1 正向调节 HCV RNA 复制。总的来说,这些观察结果提供了对 TGF-β1 激活机制的深入了解,该机制可能表现为与丙型肝炎感染相关的肝纤维化。
In this study, we demonstrated the molecular mechanisms of TGF-β1 induction as well as proteolytic activation in HCV (JFH-1)-infected cells. Our studies showed the synthesis and secretion of TGF-β1 in HCV-infected cells which was reduced in the presence of Ca2+ chelators, an inhibitor of mitochondrial Ca2+ uptake, and antioxidants. We also showed that the expression of HCV NS proteins NS3/4A, and NS5A can induce TGF-β1 by cell-based luciferase assay. Furthermore, mutational analysis revealed that the functionally active protease domain of NS3 and N-terminus domain of NS5A are required for TGF-β1 activity. Using siRNA approach we demonstrated that HCV-induced furin and thrombospondin-1 (TSP-1) are involved in the proteolytic activation of TGF-β1. Our results also suggest that TGF-β1 positively regulates HCV RNA replication. Collectively, these observations provide insight into the mechanism of TGF-β1 activation, which likely manifest in liver fibrosis associated with hepatitis C infection.
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