复制病毒基因组诱导细胞应激反应,干扰病毒蛋白质表达,而不影响抗病毒免疫力
bioRxiv : the preprint server for biology
|June 9, 2023
概括
回复病毒基因组 (cbVGs) 通过PKR触发压力颗粒 (SG) 形成和翻译抑制,减少病毒蛋白表达,独立于MAVS信号. 在病毒感染期间,这种应激反应对于抗病毒免疫是不可或缺的.
科学领域:
- 病毒学 病毒学
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
背景情况:
- 抗病毒反应通常涉及翻译抑制和压力颗粒 (SG) 形成.
- 病毒感染期间这些细胞反应的触发因素和作用尚未完全理解.
- 复制后的病毒基因组 (cbVGs) 是通过MAVS途径在仙台病毒 (SeV) 和呼吸道结囊病毒 (RSV) 感染期间诱导抗病毒免疫的关键诱因.
研究的目的:
- 研究cbVG与细胞应激反应,特别是病毒感染期间SG形成之间的关系.
- 确定cbVG诱导SG形成和翻译抑制的机制.
- 评估SG形成和翻译抑制对抗病毒免疫力的影响.
主要方法:
- 在单细胞水平上进行RNA光 in situ杂交,以区分cbVGs与标准病毒基因组.
- 测量PKR激活的情况.
- 活细胞成像观察SG动态和病毒蛋白质表达.
- 在感染细胞中分析活性蛋白转化.
主要成果:
- SG形成与高水平的cbVGs相关,仅在积累cbVGs的细胞中.
- 病毒诱导的SG形成需要PKR激活,这种激活独立于MAVS信号.
- SG形成和翻译抑制不会影响整体干扰素和干扰素刺激的基因表达,这表明对抗病毒免疫的可用性.
- SG的形成是动态的,导致病毒蛋白表达的显著减少,即使在长期感染中.
结论:
- 回复病毒基因组 (cbVGs) 诱导PKR介导的病毒干扰机制.
- 这种机制涉及翻译抑制和压力颗粒 (SG) 的形成,导致病毒蛋白的产生减少.
- 由cbVG驱动的应激反应起到病毒干扰策略的作用,减少病毒蛋白表达而不损害宿主的一般抗病毒免疫力.
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