由RNase L生成的小自RNA增强了抗病毒天生的免疫力
Krishnamurthy Malathi1, Beihua Dong, Michael Gale
1Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio 44195, USA.
Nature
|July 27, 2007
概括
通过2-5A激活RNase L,产生自我RNA片段,触发抗病毒干扰素 (IFN) 生产. 缺乏RNase L的小鼠对病毒感染的IFN-β反应受损,突出显示RNase L.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 病毒学 病毒学
背景情况:
- 抗病毒天生的免疫依赖于感知病毒RNA来激活干扰素 (IFN) 生产.
- 像RIG-I和MDA5这样的关键模式识别受体启动了涉及IPS-1的信号级联.
- 启动这些抗病毒反应的RNA分子的确切起源尚不清楚.
研究的目的:
- 研究RNase L在启动抗病毒天生的免疫力中的作用.
- 确定RNase L衍生RNA片段是否可以激活IFN的产生.
- 阐明涉及RNase L介导抗病毒反应的信号通路.
主要方法:
- 激活RNase L与2',5'-链接的橄基酸盐 (2-5A) 的作用.
- 在野生型和RNase L-缺乏的小鼠胚胎纤维细胞和小鼠中分析IFN-β诱导.
- 评估RNA分裂产物及其与RIG-I,MDA5和IPS-1信号通路的相互作用.
主要成果:
- RNase L激活产生自RNA的小RNA裂变产物,启动IFN-β生产.
- 缺乏RNase L的细胞和小鼠在受到2-5A,dsRNA或病毒感染的刺激时对IFN-β诱导表现出抵抗力.
- 信号传输涉及RIG-I,MDA5和IPS-1,RNase L缺乏的小鼠在病毒感染期间产生明显较少的IFN-β.
- 在体内RNase L的激活诱导野生型但不是RNase L缺乏的小鼠的IFN-β.
结论:
- RNase L 在先天的抗病毒免疫反应中起着至关重要的作用.
- 通过2-5A激活RNase L会产生内源性RNA触发物来产生IFN.
- 这一途径绕过了对非自我RNA的直接感知需求,揭示了抗病毒免疫的新机制.
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