Hepatology:类似于丙型肝炎病毒感染的大鼠模型:病毒持续感染、肝脏疾病、宿主反应

2017-09-05 MedSci MedSci原创

RHV-rn1大鼠模型,它能够作为一种具有免疫能力和信息丰富的替代模型。

丙型肝炎病毒(HCV)缺乏相关的,易处理的、具有免疫活性的动物模型,这严重阻碍了研究者对病毒持续感染免疫和发病机制等方面的研究。

虽然缺乏HCV感染后具有较强免疫活性的模型,同源性的肝炎病毒可能会提供有用的替代模型。我们从野生型大鼠(褐家鼠)中分离出一种啮齿类肝炎病毒(RHV-rn1),RHV-rn1获得了完整的基因组序列,并且获得了一种具有感染性的反向遗传学系统。RHV-rn1在基因组特征上类似HCV,包括多蛋白裂解位点和在病毒的5'、3'非翻译区存在二级结构。研究者采用位点定向和随机突变的方法来确定病毒5'非翻译区的两个miR-122种子位点中的第一个位点。第一个miR-122种子位点是病毒复制和持续感染所必需的。下一步,研究者利用克隆衍生病毒后代,去感染近交系和远交系繁殖的鼠株。

研究结果表明RHV-rn1拥有HCV典型的特征:嗜肝性、持续复制的潜能、引起肝脏逐渐损伤的能力。肝组织病理学显示:在慢性感染的大鼠肝脏中,出现淋巴细胞聚集; 肝实质细胞发生变性、坏死等病变; 同时肝实质细胞还出现脂肪变性。

基因表达分析表明:在RHV-rn1感染期间,大鼠肝脏内的反应类似于HCV感染,包括持续激活干扰素信号通路。最后,直接抗病毒药物-Sofosbuvir,能够有效抑制大鼠慢性RHV-rn1感染。

研究结论:RHV-rn1大鼠模型,能够作为一种具有免疫能力和信息丰富的替代模型。

原始出处:

Trivedi S, Murthy S, Sharma H, et al. Viral persistence, liver disease and host response in Hepatitis C-like virus rat model. Hepatology, 2017, 2017 Aug 31. doi: 10.1002/hep.29494.

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    2017-09-08 yfjms

    学习了

    0

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    2017-09-07 wincls
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    2017-09-07 gwc384
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