卡斯帕酶-11的激活需要通过IFN诱导的GTPases溶解含有病原体的真空体
Etienne Meunier1, Mathias S Dick2, Roland F Dreier2
1Focal Area Infection Biology, Biozentrum, University of Basel, CH-4056 Basel, Switzerland.
Nature
|April 18, 2014
概括
关酸结合蛋白对于非正规的炎症体通路至关重要,该通路检测出格拉姆阴性细菌. 这些蛋白质触发真空溶解,使细菌脂聚糖的检测和随后的caspase-11激活成为可能.
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:
- 格拉姆阴性细菌的脂聚糖 (LPS) 通过涉及caspase-11的非正规炎症酶途径触发宿主细胞死亡.
- I型干扰素和干扰素诱导的基因对于在小鼠巨细胞中启动这种途径至关重要.
研究的目的:
- 为了研究干扰素诱导基因在非正规的caspase-11炎症体通路中的作用.
- 为了确定检测细胞内格拉姆阴性细菌所需的特定宿主因素.
主要方法:
- 研究了酸盐结合蛋白 (GBP) 在caspase-11炎症酶途径中的功能.
- 使用过的小鼠巨细胞感染了真空的格拉姆阴性细菌.
- 评估了细菌真空溶解,细菌释放到细胞质中,以及炎症酶激活.
主要成果:
- 对于完全非正规的 caspase-11 炎症酶活性,需要一组 guanylate-binding 蛋白 (GBP).
- GBPs被招募到细胞内细菌中,并诱导含有病原体的真空细胞的溶解.
- 空溶解释放细菌,允许LPS检测和炎症酶激活;然而,加勒-8介导的自酶吸收减少了caspase-11的激活.
结论:
- 宿主介导的含有病原体的真空体溶解是一个关键的免疫功能.
- 炎症体对病原体的有效细胞识别需要真空溶解.
- GBPs在启动宿主免疫反应对细胞内格拉姆阴性细菌方面发挥着关键作用.
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