首页> 外文期刊>Infection and immunity >Anthrax Lethal Toxin Triggers the Formation of a Membrane-Associated Inflammasome Complex in Murine Macrophages
【24h】

Anthrax Lethal Toxin Triggers the Formation of a Membrane-Associated Inflammasome Complex in Murine Macrophages

机译:炭疽致死毒素触发了小鼠巨噬细胞中膜相关的炎性体复合物的形成。

获取原文
           

摘要

Multiple microbial components trigger the formation of an inflammasome complex that contains pathogen-specific nucleotide oligomerization and binding domain (NOD)-like receptors (NLRs), caspase-1, and in some cases the scaffolding protein ASC. The NLR protein Nalp1b has been linked to anthrax lethal toxin (LT)-mediated cytolysis of murine macrophages. Here we demonstrate that in unstimulated J774A.1 macrophages, caspase-1 and Nalp1b are membrane associated and part of ~200- and ~800-kDa complexes, respectively. LT treatment of these cells resulted in caspase-1 recruitment to the Nalp1b-containing complex, concurrent with processing of cytosolic caspase-1 substrates. We further demonstrated that Nalp1b and caspase-1 are able to interact with each other. Intriguingly, both caspase-1 and Nalp1b were membrane associated, while the caspase-1 substrate interleukin-18 was cytosolic. Caspase-1-associated inflammasome components included, besides Nalp1b, proinflammatory caspase-11 and the caspase-1 substrate α-enolase. Asc was not part of the Nalp1b inflammasome in LT-treated macrophages. Taken together, our findings suggest that LT triggers the formation of a membrane-associated inflammasome complex in murine macrophages, resulting in cleavage of cytosolic caspase-1 substrates and cell death.
机译:多种微生物成分触发了炎性体复合物的形成,该复合物包含病原体特异性核苷酸低聚和结合域(NOD)样受体(NLR),caspase-1,在某些情况下还包含支架蛋白ASC。 NLR蛋白Nalp1b已与炭疽致死毒素(LT)介导的鼠巨噬细胞的细胞溶解有关。在这里,我们证明了在不受刺激的J774A.1巨噬细胞中,caspase-1和Nalp1b是膜相关的,分别是〜200-kDa和〜800-kDa复合物的一部分。这些细胞的LT处理导致caspase-1募集到含有Nalp1b的复合物中,同时处理了胞质caspase-1底物。我们进一步证明了Nalp1b和caspase-1能够相互作用。有趣的是,caspase-1和Nalp1b都是膜相关的,而caspase-1底物白介素18是胞质的。除Nalp1b外,还包括caspase-1相关的炎性体成分,促炎性caspase-11和caspase-1底物α-烯醇酶。在经LT处理的巨噬细胞中,Asc不是Nalp1b炎性小体的一部分。两者合计,我们的发现表明LT触发在小鼠巨噬细胞中膜相关的炎性体复合物的形成,从而导致胞浆caspase-1底物的裂解和细胞死亡。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号