J Virol:HCV致病性和感染性研究获进展

2014-05-28 感染免疫中心 姚文霞 中科院广州生物医药与健康研究院

近日,中科院广州生物医药与健康研究院在丙型肝炎病毒(HCV)致病性和感染性研究方面取得新进展,相关研究成果于5月14日在线发表在《病毒学杂志》Journal of Virology上。 据WHO最新统计,目前全球约1.85亿人被丙型肝炎病毒慢性感染;我国的丙肝病毒携带率高达3.5%,并且发病率逐年增加。HCV感染后不仅会导致慢性肝炎、脂肪肝、肝硬化直至肝癌等肝脏疾病,还会导致

近日,中科院广州生物医药与健康研究院在丙型肝炎病毒HCV致病性感染性研究方面取得新进展,相关研究成果于5月14日在线发表在《病毒学杂志》Journal of Virology上。

据WHO最新统计,目前全球约1.85亿人被丙型肝炎病毒慢性感染;我国的丙肝病毒携带率高达3.5%,并且发病率逐年增加。HCV感染后不仅会导致慢性肝炎、脂肪肝、肝硬化直至肝癌等肝脏疾病,还会导致代谢性疾病的发生(例如胰岛素抵抗和二型糖尿病)。而HCV感染进行自身复制及导致代谢疾病发生的机制还有待于深入研究。中科院广州生物医药与健康研究院彭涛实验室发现,HCV感染同时上调了WT-PGC-1α 和L-PGC-1α 的表达,上调的PGC-1α 一方面促进HCV病毒的产生,一方面导致HCV诱发的胰岛素抵抗;HCV感染对PGC-1α的上调依赖于HCV的RNA复制,内质网应激(ER stress)介导了该上调作用。

PGC-1α作为共激活因子,通过与其他转录因子的相互作用实现对下游靶基因的转录调控。作为能量代谢的关键调控因子,PGC-1α在肝脏中参与了对糖异生和脂肪酸氧化的调控。2011年报道发现了人肝脏中PGC-1α新的异构体,即L-PGC-1α;相应地之前经典的PGC-1α被称为WT-PGC-1α。彭涛实验室的研究结果显示,HCV感染可以上调上述两种形式PGC-1α 的表达,ER stress介导了HCV感染对PGC-1α 的上调;结果还显示,ER stress抑制剂PBA在抑制HCV感染对PGC-1α 上调的同时,亦可以抑制HCV病毒的产生(PBA已被美国FDA批准用于治疗尿素循环异常)。该研究成果不仅在机制上深化了人们对HCV致病性和感染性的认识,还在应用上提示可将HCV-ERstress-PGC-1α 信号通路作为治疗HCV感染以及相关胰岛素抵抗的潜在药物靶标。

原始出处

Yao W1, Cai H1, Li X2, Li T1, Hu L1, Peng T3.Endoplasmic reticulum stress links hepatitis C virus RNA replication to WT-PGC-1α/L-PGC-1α upregulation.J Virol. 2014 May 14

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    2014-07-21 cnxcy
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    2014-05-30 ymljack

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