炎症酶主要限制人体巨细胞内细胞质沙门氏菌的复制
Marisa S Egan1, Emily A O'Rourke1, Shrawan Kumar Mageswaran2,3
1Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, United States.
eLife
|March 31, 2025
概括
炎症酶,包括caspase-1和caspase-4,限制了沙门氏菌Typhimurium在人类巨细胞中的复制. 这种利用气体皮质D和忍林-1的过程限制了宿主细胞细胞醇和真空中细菌的生长.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 细胞生物学 细胞生物学
背景情况:
- 沙门氏菌Typhimurium是一种使用III型分泌系统 (T3SSs) 感染宿主细胞的细胞内病原体.
- 炎症细胞体是细胞质免疫复合体,激活卡斯帕斯,导致IL-1细胞因子的释放和炎症亡,一种炎症细胞死亡形式.
- 人类巨细胞开始对沙门氏菌感染的炎症性反应,这限制了细菌的复制,但确切的机制仍然不清楚.
研究的目的:
- 阐明炎症体通过哪些机制来限制Salmonella Typhimurium在人类巨细胞中的复制.
- 识别关键的炎症组分和下游作用因子,参与控制细胞内细菌的增殖.
主要方法:
- 使用了感染沙门氏菌Typhimurium的人类巨细胞.
- 研究了caspase-1,caspase-4,gasdermin D (GSDMD) 和ninjurin-1 (NINJ1) 在炎症酶激活和细菌限制中的作用.
- 在各种炎症酶缺乏条件下,评估了宿主细胞内的沙门氏菌复制.
主要成果:
- 卡斯帕-1对炎症酶反应至关重要,并且限制了人类巨细胞中的沙门氏菌复制;卡斯帕-4也在其中发挥作用.
- 加斯德明D (GSDMD) 和宁林-1 (NINJ1) 在控制沙门氏菌复制方面发挥着重要作用.
- 炎症酶反应的缺失导致了感染细胞的细胞质和真空中沙门氏菌复制的增加.
结论:
- 炎症性卡斯帕斯 (卡斯帕斯-1和卡斯帕斯-4) 和 pyroptotic 因素 (GSDMD,NINJ1) 对于限制沙门氏菌Typhimurium复制是必不可少的.
- 在人类巨细胞内,炎症体控制着细胞和真空水平的沙门氏菌复制.
- 这些发现揭示了炎酶介导宿主防御在限制细胞内细菌病原体中的关键作用.
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