从使用IRF3作为适配器的晚期内酶体区向NF-κB发送STING信号
Bao-Cun Zhang1,2, Alice Pedersen3, Line S Reinert3,4
1Department of Biomedicine, Aarhus University, Aarhus, Denmark. baocunzh@biomed.au.dk.
Nature immunology
|September 19, 2025
概括
STING通过IRF3激活NF-κB,在一个涉及内酶体的延迟途径中. 这种依赖IRF3和TRAF6的保存免疫机制在特定时间窗口内发生,以调节炎症.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 核因子卡帕B (NF-κB) 对于免疫反应至关重要.
- 由细胞质DNA激活的cGAS-STING通路诱导I型干扰子 (IFN) 和NF-κB信号传递,有助于宿主防御和炎症.
- 通过STING介导的NF-κB激活的确切机制尚不清楚.
研究的目的:
- 阐明STING激活NF-κB的机制.
- 确定参与STING诱导的NF-κB信号传递的关键分子和细胞区.
- 了解STING向NF-κB传递信号的时间调节.
主要方法:
- 通过基于细胞的测试,研究了STING-NF-κB激活动态.
- 利用生物化学方法分析蛋白质-蛋白质相互作用,包括IRF3和TRAF6招募到STING.
- 检查了细胞区的作用,如戈尔吉和内分泌体,在信号通路中.
主要成果:
- 在从Golgi转移到内解体隔间后,STING以延迟的方式激活NF-κB.
- NF-κB的激活依赖于IFN诱导的转录因子IRF3,但不依赖于I型IFN信号传递.
- IRF3与pS358的STING结合,与参与IFN反应的pS366区分开来,促进TRAF6的招募和随后的NF-κB激活.
- 这种信号通路在四足动物中保留着.
结论:
- STING利用一个独特的信号表面 (pS358) 和IRF3作为适配器,通过TRAF6招募在内酶体中激活NF-κB.
- 戈尔吉出口和溶酶体降解之间的时间窗口对于STING介导的NF-κB激活至关重要,可能会限制炎症.
- 这项研究揭示了STING诱导的免疫信号传递的新机制,并提供了对炎症调节的见解.
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