抑制EEF2的毒素会激活NLRP1炎症体,并促进表皮屏障的破坏
Miriam Pinilla1, Raoul Mazars1, Romain Vergé1
1Institute of Pharmacology and Structural Biology , University of Toulouse, CNRS , Toulouse, France.
The Journal of experimental medicine
|August 29, 2023
概括
Pseudomonas aeruginosa 的外毒素A 通过 riboylating eukaryotic 延伸因子2 (EEF2) 激活NLRP1炎症体,从而引起核糖毒性压力. ZAKα 激酶抑制剂可以阻断囊性纤维化细胞中的这种炎症酶激活.
科学领域:
- 传染病 传染病 传染病
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
背景情况:
- 慢性 Pseudomonas aeruginosa 感染会改变人类的呼吸道和角膜上皮细胞.
- NLRP1炎症酶是这些上皮细胞中的关键传感器.
- P. aeruginosa通过其2型分泌系统 (T2SS) 释放外毒素A (EXOA).
研究的目的:
- 研究NLRP1炎症酶在P. aeruginosa慢性感染中的作用.
- 阐明EXOA激活NLRP1.1的机制.
- 探索针对这种途径的治疗策略.
主要方法:
- 人类呼吸道和角膜上皮的细胞培养模型.
- 生物化学分析检测蛋白质的修饰和激活.
- 在患者衍生的囊性纤维化细胞中分析炎症酶激活.
- 使用激酶抑制剂 (ZAKα) 来探测信号通路.
主要成果:
- 在慢性感染期间,NLRP1炎症酶检测到P. aeruginosa外毒素A (EXOA).
- 埃克索亚核糖化并使真核延长因子2 (EEF2) 失活,从而诱导核毒性压力.
- 这种压力通过ZAKα和P38依赖的酸化和降解激活NLRP1.
- 囊性纤维化细胞对EXOA诱导的NLRP1激活具有高度敏感性,NLRP1激活对ZAKα抑制剂敏感.
结论:
- P. aeruginosa EXOA是一种关键的毒性因子,可以激活NLRP1依赖的上皮损伤.
- 通过EXOA对EEF2的不激活会触发ZAKα依赖的信号级联,导致炎症酶激活.
- ZAKα作为病毒性失活的EEF2的关键传感器,具有潜在的治疗标.
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