通过ADH5维持的S-nitrosothiol稳态促进了对病原体的STING-依赖宿主防御
Mutian Jia1,2, Li Chai1,2, Jie Wang1,2
1Department of Pathogenic Biology, Key Laboratory for Experimental Teratology of the Chinese Ministry of Education, and Key Laboratory of Infection and Immunity of Shandong Province, School of Basic Medical Science, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China.
在氧化突发过程中产生的反应性物种 (RNS) 可以通过积累S-nitrosothiols (SNOs) 损害先天免疫力. 酒精脱酶5 (ADH5) 通过代谢SNO来帮助维持免疫反应,从而授权STING激活.
科学领域:
- 免疫学 免疫学 免疫学
- 生物化学 生物化学
- 微生物学 微生物学
背景情况:
- 氧化突发对于宿主对病原体的防御至关重要,涉及反应性物种 (RNS).
- 感染期间的RNS过量会导致S-nitrosothiol (SNO) 积累,从而损害生物分子.
- 在氧化突发期间调节先天免疫激活的精确机制尚未完全理解.
研究的目的:
- 为了研究内源性S-尼特罗斯谷 (GSNO) 在微生物感染期间调节先天免疫反应中的作用.
- 阐明GSNO影响干扰素基因刺激器 (STING) 途径的机制.
- 确定酒精脱酶5 (ADH5) 在调节SNO水平和天生的免疫力方面的功能.
主要方法:
- 研究了GSNO对对简单疹病毒-1 (HSV-1) 和Listeria monocytogenes的宿主防御的影响.
- 研究了STING在Cys257中的S-化及其对STING-cGAMP结合的影响.
- 利用Adh5缺乏模型来评估ADH5在免疫反应和病毒复制中的作用.
主要成果:
- 发现GSNO可以减弱对HSV-1和Listeria monocytogenes感染的先天免疫反应.
- 通过诱导其在Cys257的S-化,GSNO抑制了STING的激活,从而阻止了cGAMP的结合.
- ADH5会代谢GSNO,减少细胞SNO,从而促进STING的激活.
- Adh5 缺乏导致了依赖STING的免疫力受损,病毒复制增加.
结论:
- 细胞氧化突发诱导的RNA可以减弱STING介导的对微生物感染的先天免疫反应.
- ADH5通过维持细胞SNO平衡,在授权STING激活方面发挥着关键作用.
- 针对GSNO-STING-ADH5轴可以提供新的策略来增强对病原体的先天免疫力.
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