人类DBR1缺乏会损害压力颗粒依赖的PKR抗病毒免疫力
Shuo Ru1,2, Sisi Tang1,2, Hui Xu1,2
1Division Life Sciences and Medicine, Department of General Surgery, The First Affiliated Hospital of USTC, Key Laboratory of Immune Response and Immunotherapy, Center Advanced Interdisciplinary Science and Biomedicine IHM, University of Science and Technology of China, Hefei, China.
在RNA lariat-debranching酶1 (DBR1) 中的先天性错误会损害抗病毒免疫力. DBR1 缺乏导致RNA lariat 积累,阻碍了压力颗粒的组装和对病毒的PKR激活.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
背景情况:
- RNA lariat-debranching enzyme 1 (DBR1) 的先天性错误与大脑干病毒脑炎有关,但机制尚不清楚.
- RNA lariat是非编码RNA结构,当DBR1功能受损时可以积累.
研究的目的:
- 阐明将DBR1缺乏与病毒性脑炎联系起来的分子机制.
- 研究RNA lariat和压力颗粒在抗病毒防御中的作用.
主要方法:
- 研究了缺乏DBR1的人类细胞和Dbr1Y17H/Y17H小鼠.
- 分析了应力颗粒 (SG) 组件,G3BP1/2蛋白水平和PKR激活.
- 在体外和体外评估病毒敏感性.
主要成果:
- DBR1缺乏导致RNA lariat积累,破坏SG组装并导致G3BP1/2降解.
- 损坏的SG组件阻碍了PKR激活,降低了对HSV-1等病毒的抗病毒防御能力.
- Dbr1Y17H/Y17H小鼠表现出增加的病毒敏感性,减少G3BP1/2表达,减少PKR酸化.
结论:
- DBR1介导的RNA lariat脱枝对于G3BP1/2-和SG组装依赖的PKR激活至关重要,使细胞内在的抗病毒免疫成为可能.
- 由于RNA lariat积累引起的抗病毒途径受损,DBR1缺乏的患者容易感染病毒性疾病.
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