Plos pathogens:新进展,TGFβ抑制乙型肝炎病毒复制

2015-04-09 佚名 生物谷

近日,国际学术期刊plos pathogens在线发表了日本科学家的一项最新研究进展,他们发现在TGFβ对乙型肝炎病毒(HBV)复制的抑制过程依赖于活化诱导胞嘧啶核苷脱氨酶(AID)的表达,AID能够显著抑制HBV转录和病毒DNA合成,最终导致对病毒复制的抑制。 乙型肝炎病毒(HBV)是导致肝细胞癌发生的一个重要诱发因素。最近一些研究发现APOBEC脱氨酶家族成员能够通过抑制病毒复制(如

近日,国际学术期刊plos pathogens在线发表了日本科学家的一项最新研究进展,他们发现在TGFβ对乙型肝炎病毒(HBV)复制的抑制过程依赖于活化诱导胞嘧啶核苷脱氨酶(AID)的表达,AID能够显著抑制HBV转录和病毒DNA合成,最终导致对病毒复制的抑制。
 
乙型肝炎病毒(HBV)是导致肝细胞癌发生的一个重要诱发因素。最近一些研究发现APOBEC脱氨酶家族成员能够通过抑制病毒复制(如HBV和HIV)发挥抗病毒功能。有研究证明APOBEC3G能够通过促进病毒新合成DNA高突变或抑制逆转录过程抑制病毒复制。另一项研究发现AID也具有限制病毒复制的功能,但其中的机制仍不清楚。
 
TGFβ能够抑制乙型肝炎病毒(HBV)复制,但对于参与该过程的细胞内效应因子了解甚少。研究人员发现TGFβ对HBV病毒转录的抑制作用依赖于AID的表达,AID能够显著抑制HBV转录和病毒DNA合成,最终导致对病毒复制的抑制。通过实验发现AID能够与病毒P蛋白发生相互作用结合病毒特定的RNA序列。AID还可以与一种RNA降解复合物(RNA exosome)发生结合,这表明AID,RNA exosome和P蛋白能够形成RNP复合物。删除AID或RNA exosome能够消除TGFβ对HBV转录的抑制,因此,AID和RNA exosome参与了TGFβ介导的对HBV RNA转录的抑制。研究人员进一步证明,当P蛋白表达受到影响或病毒转录受到抑制,AID介导的HBV下降就不会发生。
 
综上所述,这些结果表明通过TGFβ诱导AID表达会引起对RNA exosome的招募形成RNP复合物,RNA exosome能够通过与转录偶联的方式降解HBV RNA,从而发挥抗HBV的功能。

原始出处:

Guoxin Liang , Guangyan Liu , Kouichi Kitamura, Zhe Wang, Sajeda Chowdhury, Ahasan Md Monjurul, Kousho Wakae, Miki Koura, Miyuki Shimadu, Kazuo Kinoshita, Masamichi Muramatsu.TGF-β Suppression of HBV RNA through AID-Dependent Recruitment of an RNA Exosome Complex.PLOS, April 2, 2015; DOI: 10.1371/journal.ppat.1004780

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    2015-10-26 changhe713
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    2015-06-05 yuanming7
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    2015-08-30 cnxcy
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