Integrin-mediated first signal for inflammasome activation in intestinal epithelial cells.

Integrin-mediated first signal for inflammasome activation in intestinal epithelial cells.
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整合素介导的肠上皮细胞中炎性体激活的第一信号。

DOI:
10.4049/jimmunol.1400145
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发表时间:
2014-08-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Dube PH
Dube PH
中科院分区:
其他
文献类型:
--
作者:
Thinwa J;Segovia JA;Bose S;Dube PH

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肠上皮细胞如何识别病原体并激活肠道表面的炎性小体尚不清楚。我们假设肠上皮细胞利用整合素受体识别病原体并在肠道内引发炎症。我们发现感染肠道病原体小肠结肠炎耶尔森菌的肠上皮细胞使用β1整合素作为病原体识别受体,检测细菌粘附素入侵。入侵素-整合素相互作用为NLRP3炎性小体激活提供了第一个信号,第三型分泌系统转位子为炎性小体激活提供了第二个信号,导致IL-18的释放。在感染期间,耶尔森菌使用两种毒力因子,YopE和YopH,来对抗入侵介导的整合素依赖性炎症小体激活。此外,上皮细胞中NLRP3炎性小体的激活需要局灶黏附复合物信号通路、局灶黏附激酶和rac 1的组分。入侵蛋白与β1整合素结合可快速诱导IL-18 mRNA表达,提示整合素为NLRP3炎性小体激活提供了第一信号。这些数据表明,整合素作为肠道上皮细胞上的病原体识别受体,可快速诱导炎症小体衍生的il -18介导的反应。
How intestinal epithelial cells recognize pathogens and activate inflammasomes at intestinal surfaces is poorly understood. We hypothesized that intestinal epithelial cells utilize integrin receptors to recognize pathogens and initiate inflammation within the intestinal tract. We find that intestinal epithelial cells infected with Yersinia enterocolitica, an enteric pathogen, use β1 integrins as pathogen recognition receptors detecting the bacterial adhesin invasin. The invasin-integrin interaction provides the first signal for NLRP3 inflammasome activation with the type three secretion system translocon providing the second signal for inflammasome activation resulting in release of IL-18. During infection, Yersinia employs two virulence factors, YopE and YopH, to counteract invasin-mediated integrin-dependent inflammasome activation. Further, NLRP3 inflammasome activation in epithelial cells requires components of the focal adhesion complex signaling pathway, focal adhesion kinase and rac 1. The binding of invasin to β1 integrins rapidly induces IL-18 mRNA expression suggesting integrins provide a first signal for NLRP3 inflammasome activation. These data suggest integrins function as pathogen recognition receptors on intestinal epithelial cells to rapidly induce inflammasome-derived IL-18-mediated responses.
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