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显著的顺序死亡复合体调节热和IL-1β释放,以应对Yersinia阻断免疫信号的反应
Ronit Schwartz Wertman1, Winslow Yost1, Beatrice I Herrmann1
1Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA.
Science advances
|July 26, 2024
概括
叶菌感染触发了一种独特的细胞死亡途径,涉及酶-8和酶-1,与典型的炎症酶激活不同. 这项研究揭示了在病原体诱导的免疫信号屏蔽期间,热和IL-1β释放的新型机制.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 微生物学 微生物学
背景情况:
- 病原体感染会诱导热,这是由炎症性卡斯帕斯介导的炎症性细胞死亡.
- 耶尔西尼亚毒性因子YopJ破坏了免疫信号,导致细胞死亡,包括apoptotic caspase-8和pyroptotic caspase-1.
- 由Yersinia诱导的caspase-1激活绕过了正规的炎症细胞通路.
研究的目的:
- 为了阐明Yersinia诱导的热和IL-1β释放的机制.
- 调查卡斯帕-8和卡斯帕-1在Yersinia介导的细胞死亡中的作用.
- 为了区分控制热致死和IL-1β分泌的途径.
主要方法:
- 在宿主细胞中利用了Yersinia感染模型.
- 研究了酶激活动力学和局部化.
- 分析了炎酶组分参与 (NLRP3) 和气皮D激活.
主要成果:
- 卡斯帕-8 作为启动剂,卡斯帕-1 通过前循环扩大自身的激活.
- 耶尔西尼亚诱导的热和卡斯帕-1激活是炎酶独立的.
- 然而,IL-1β释放需要NLRP3炎症酶激活.
- 卡斯帕-8和正规的炎症体复合体在空间和时间上明显地聚集在一起.
结论:
- 耶尔西尼亚使用不同的,相互连接的死亡复合体来调解热和IL-1β释放.
- 卡斯帕-8启动了一种新的细胞死亡途径,而卡斯帕-1通过自动处理和气皮胺D激活来放大它.
- 炎症酶依赖和不依赖的通路对细胞死亡和细胞因子释放有不同的调节.
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