Human ezrin-moesin-radixin proteins modulate hepatitis C virus infection.

Human ezrin-moesin-radixin proteins modulate hepatitis C virus infection.
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DOI:
10.1002/hep.26500
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发表时间:
2013-11
期刊:
影响因子:
13.5
通讯作者:
Szabo, Gyongyi
Szabo, Gyongyi
中科院分区:
医学1区
文献类型:
--
作者:
Bukong, Terence N.;Kodys, Karen;Szabo, Gyongyi

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埃兹蛋白-模蛋白-根蛋白 (EMR) 家族的宿主细胞骨架蛋白已被证明可以通过调节稳定的微管形成来调节单链 RNA 病毒感染。 CD81(HCV 进入的关键受体)的抗体结合可诱导埃兹蛋白磷酸化。在这里,我们测试了 EMR 蛋白在调节 HCV 感染中的作用,并探索了潜在的治疗靶点。我们发现,HCV E2 蛋白可诱导埃兹蛋白快速磷酸化,并通过脾酪氨酸激酶 (SYK) 与 F-肌动蛋白进行细胞再分配。治疗性阻断 SYK 或 F-肌动蛋白重组的功能作用可显着降低 Huh7.5 细胞对 HCV J6/JFH-1 感染的敏感性。通过基因调控、实时定量 PCR、蛋白质印迹和荧光显微镜分析,我们发现 EMR 家族蛋白差异调节 J6/JFH-1/Huh7.5 细胞系统中的 HCV 感染。与对照相比,在慢性 HCV J6/JFH-1 感染的 Huh7.5 细胞和 HCV 感染的患者肝活检中,Moesin 和 radixin 的表达显着降低,但埃兹蛋白则没有。 HCV J6/JFH-1感染的Huh7.5细胞中moesin和radixin的减少与稳定微管的显着增加相关。 Ezrin 敲低抑制了 HCV 感染的立即进入后事件。 moesin 或 radixin 的过度表达显着降低了 HCV 蛋白的表达。相比之下,moesin 或 radixin 的短暂敲低会增强 HCV 感染。利用Con1 HCV复制子系统,我们测试了EMR蛋白对HCV复制的影响。我们发现moesin的瞬时敲低增加了HCV RNA的表达,而EMR的过表达对HCV复制没有显着影响。我们的研究结果证明了 EMR 蛋白在 HCV 感染过程中的重要作用,并强调了 HCV 治疗的可能新靶点。
Host cytoskeletal proteins of the ezrin-moesin-radixin (EMR) family have been shown to modulate single-stranded RNA virus infection through regulating stable microtubule formation. Antibody engagement of CD81, a key receptor for HCV entry, induces ezrin phosphorylation. Here we tested the role of EMR proteins in regulating HCV infection and explored potential therapeutic targets. We show that HCV E2 protein induces rapid ezrin phosphorylation and its cellular redistribution with F-actin via spleen tyrosine kinase (SYK). Therapeutically blocking the functional roles of SYK or F-actin reorganization significantly reduced Huh7.5 cell susceptibility to HCV J6/JFH-1 infection. Using gene regulation, real-time quantitative PCR, western blot and fluorescent microscopy analysis, we found that proteins of the EMR family differentially regulate HCV infection in the J6/JFH-1/Huh7.5 cell system. Moesin and radixin, but not ezrin, expression were significantly decreased in chronic HCV J6/JFH-1 infected Huh7.5 cells and HCV infected patient liver biopsies compared to controls. The decreases in moesin and radixin in HCV J6/JFH-1 infected Huh7.5 cells were associated with a significant increase in stable microtubules. Ezrin knockdown inhibited immediate post-entry events in HCV infection. Over-expression of moesin or radixin significantly reduced HCV protein expression. In contrast, transient knockdown of moesin or radixin augmented HCV infection. Making use of the Con1 HCV replicon system, we tested the effect of EMR proteins on HCV replication. We found that transient knockdown of moesin increased HCV RNA expression while over-expression of EMR showed no significant effect on HCV replication. Our findings demonstrate the important role of EMR proteins during HCV infection at the post-entry level and highlight possible novel targets for HCV treatment.
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