E3 连接酶 RAD18 针对化 IRF3 终止 IFNB1 转录
Yiting Cai1,2, Jiaqi Zheng1,3, Linlin Zhao1,4
1Institute of Immunology, Zhejiang University School of Medicine, Hangzhou, China.
Nature immunology
|August 29, 2025
概括
RAD18针对化IRF3进行降解,停止I型干扰素的产生. 这一发现为病毒感染和自身免疫性疾病提供了潜在的治疗点.
科学领域:
- 免疫学
- 分子生物学
- 病毒学
背景情况:
- 干扰素调节因子3 (IRF3) 对于启动I型干扰素转录至关重要,对于宿主对病原体的防御至关重要.
- 干扰素途径的失调与病毒感染和自身免疫性疾病 (如全身性红斑狼) 有关.
研究的目的:
- 确定调节IRF3驱动的干扰素转录的分子机制.
- 研究RAD18在化IRF3 (p-IRF3) 降解中的作用及其对宿主防御的影响.
主要方法:
- 生物化学测试以确定RAD18与p-IRF3的相互作用.
- 无处不在测试以确定无处不在的类型和所涉及的特定氨酸残留物.
- 使用转基因小鼠 (Rad18fl/fl Lysm-cre) 进行体内研究以评估对病毒感染的耐药性.
- 从活跃的全身性红斑狼和H1N1感染的患者获得的人类巨细胞和单细胞中的RAD18,p- IRF3和IFNB1mRNA水平的分析.
主要成果:
- RAD18被确定为一种选择性地向p- IRF3进行自降解的E3泛素联酶.
- 通过在Lys193中触发K63多化,RAD18促进了p- IRF3与IFNB促进物的分离.
- 随处可见的p-IRF3与促进体分离,转移出核,并发生降解.
- 由于IFNβ的产量增加,Rad18小鼠对致命的囊泡性口腔炎病毒产生了抵抗力.
- 在人体样本中,RAD18蛋白水平与H1N1感染的巨细胞/单细胞以及活跃的全身性红斑狼患者的p- IRF3和IFNB1mRNA水平呈负相关性.
结论:
- 作为一个负调节剂,RAD18终止了IRF3介导的IFNB1转录.
- 通过RAD18调解的p- IRF3降解是干扰素反应的一个关键检查点.
- RAD18 是一种潜在的治疗点,用于治疗 RNA 病毒感染和因干扰素信号异常而导致的自身免疫性疾病.
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