登革热病毒复制形式的dsRNA被RIG-I和MDA5都识别,以激活天生的免疫力
Sichao Ye1,2, Yisha Liang1,2,3, Yu Chang1,3
1CAS Key Laboratory of Molecular Virology and Immunology, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China.
Journal of medical virology
|January 28, 2025
概括
登革热病毒 (DENV) 感染引发由RIG-I类似受体 (RLRs) 介导的干扰素反应,主要是RIG-I和MDA5.5. 研究人员确定了DENV.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 分子生物学分子生物学
背景情况:
- 像RIG-I类受体 (RLR) 是RNA病毒感染的关键细胞质传感器,启动先天免疫反应.
- 由RLRs识别的登革热病毒 (DENV) 的特定病原体相关分子模式 (PAMPs) 仍然不太清楚.
- 截然不同的RLRs,RIG-I和MDA5,通常被认为可以识别不同类型的病毒RNA结构.
研究的目的:
- 阐明宿主RLRs对DENV PAMP识别的分子基础.
- 研究RIG-I和MDA5在DENV诱导的干扰素反应中的作用.
- 描述激活RLRs的特定DENVRNA结构.
主要方法:
- 在存在RIG-I和MDA5.5的情况下评估DENV感染诱导的干扰素反应.
- 从受感染细胞中提取纯化的DENV PAMPRNA.
- 通过在体外复制病毒复制形式RNA的DENV PAMP身份得到确认.
主要成果:
- DENV感染激活了依赖于RIG-I和MDA5的干扰素生产,其中RIG-I占主导地位.
- DENV PAMP被确定为具有5'三酸盐 (5'ppp) 修饰的全长双链RNA.
- 这种已识别的DENV PAMP很可能代表病毒复制形式的RNA.
结论:
- 这项研究定义了DENV PAMP和RLR之间的分子相互作用,澄清了先天免疫识别.
- 研究结果显示,相同的PAMP部分可以被不同的RLRs识别,突出显示了微妙的先天免疫机制.
- 这项研究有助于了解宿主对抗RNA病毒的防御能力,例如DENV.
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