Hepatitis C virus proteins activate NRF2/ARE pathway by distinct ROS-dependent and independent mechanisms in HUH7 cells.

Hepatitis C virus proteins activate NRF2/ARE pathway by distinct ROS-dependent and independent mechanisms in HUH7 cells.
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DOI:
10.1371/journal.pone.0024957
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Isaguliants MG
Isaguliants MG
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ivanov AV;Smirnova OA;Ivanova ON;Masalova OV;Kochetkov SN;Isaguliants MG

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丙型肝炎病毒(HCV)是一种高致病性人类病毒,与肝纤维化、脂肪变性和癌症有关。在受感染的细胞中,HCV 会诱导氧化应激。在这里,我们发现 HCV 蛋白核心、E1、E2、NS4B 和 NS5A 通过几种独立的机制激活抗氧化防御 Nrf2/ARE 途径。通过分析 Huh7 细胞中 HCV 蛋白和荧光素酶报告基因的瞬时共表达,证明了这一点。使用发光测定、RT-qPCR 和/或蛋白质印迹分析研究了由应激反应基因的启动子或其最小 Nrf2 反应元件控制的表达。所有五种蛋白质均通过蛋白激酶 C 诱导 Nrf2 激活,以响应活性氧 (ROS) 的积累。此外,核心、E1、E2、NS4B 和 NS5A 蛋白的表达导致 Nrf2 以不依赖于 ROS 的方式激活。核心和 NS5A 的作用是通过酪蛋白激酶 2 和磷酸肌醇 3 激酶介导的,而 NS4B、E1 和 E2 的作用则不受 PKC、CK2、PI3K、p38 或 ERK 介导。总而言之,在表达的最早阶段,HCV 蛋白诱导了抗氧化防御系统的强烈上调。这些事件可能是丙型肝炎急性期 HCV 诱导的氧化应激有害影响的基础。
Hepatitis C virus (HCV) is a highly pathogenic human virus associated with liver fibrosis, steatosis, and cancer. In infected cells HCV induces oxidative stress. Here, we show that HCV proteins core, E1, E2, NS4B, and NS5A activate antioxidant defense Nrf2/ARE pathway via several independent mechanisms. This was demonstrated by the analysis of transient co-expression in Huh7 cells of HCV proteins and luciferase reporters. Expression, controlled by the promoters of stress-response genes or their minimal Nrf2-responsive elements, was studied using luminescence assay, RT-qPCR and/or Western-blot analysis. All five proteins induced Nrf2 activation by protein kinase C in response to accumulation of reactive oxygen species (ROS). In addition, expression of core, E1, E2, NS4B, and NS5A proteins resulted in the activation of Nrf2 in a ROS-independent manner. The effect of core and NS5A was mediated through casein kinase 2 and phosphoinositide-3 kinase, whereas those of NS4B, E1, and E2, were not mediated by either PKC, CK2, PI3K, p38, or ERK. Altogether, on the earliest stage of expression HCV proteins induced a strong up-regulation of the antioxidant defense system. These events may underlie the harmful effects of HCV-induced oxidative stress during acute stage of hepatitis C.
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