Induction of autophagy enhances porcine reproductive and respiratory syndrome virus replication.

Induction of autophagy enhances porcine reproductive and respiratory syndrome virus replication.
复制标题

自噬诱导增强猪繁殖与呼吸综合征病毒复制

DOI:
10.1016/j.virusres.2011.11.008
复制
发表时间:
2012-02
期刊:
影响因子:
5
通讯作者:
Xiao S
Xiao S
中科院分区:
医学3区
文献类型:
--
作者:
Chen Q;Fang L;Wang D;Wang S;Li P;Li M;Luo R;Chen H;Xiao S

文献摘要

参考文献

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自噬是一种进化上保守的溶酶体依赖性降解途径,其作用在于维持细胞稳态,并在病毒复制和发病机制中发挥重要作用。在这项研究中,我们研究了自噬在猪繁殖与呼吸综合征病毒 (PRRSV) 复制中的作用,这种病毒自 20 世纪 80 年代末以来给国际养猪业造成了毁灭性的损失。使用蛋白质定量和显微镜观察,我们观察到 PRRSV 感染导致 LC3-I/II 转换,点状 GFP-LC3 表达细胞的积累增加,以及宿主细胞细胞质中自噬体样双膜囊泡的数量增加。使用 3-甲基腺嘌呤 (3-MA) 或靶向 ATG7 和 Beclin-1 的小干扰 RNA 抑制自噬,导致 PRRSV 滴度和蛋白表达显着降低。相反,雷帕霉素诱导自噬导致病毒复制增加。这些结果表明 PRRSV 感染会诱导自噬,从而提高病毒复制效率。
Autophagy is an evolutionarily conserved lysosome-dependent degradation pathway that acts in the maintenance of cellular homeostasis and plays important functions in viral replication and pathogenesis. In this study, we investigated the role of autophagy in the replication of porcine reproductive and respiratory syndrome virus (PRRSV), an agent that has caused devastating losses in the international swine industry since the late 1980s. Using protein quantification and microscopy, we observed that PRRSV infection results in LC3-I/II conversion, an increased accumulation of punctate GFP-LC3-expressing cells, and a higher number of autophagosome-like double-membrane vesicles in the cytoplasm of host cells. Inhibition of autophagy using 3-methyladenine (3-MA) or small interfering RNAs targeting ATG7 and Beclin-1 led to a significant reduction in PRRSV titers and protein expression. Conversely, induction of autophagy by rapamycin resulted in increased viral replication. These results demonstrate that PRRSV infection induces autophagy which, in turn, enhances viral replication efficiency.
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作者:
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