NOD1和NOD2信号链接ER压力与炎症
A Marijke Keestra-Gounder1, Mariana X Byndloss1, Núbia Seyffert1
1Department of Medical Microbiology and Immunology, School of Medicine, University of California at Davis, One Shields Ave, Davis, California 95616, USA.
通过NOD1和NOD2模式识别受体引发炎症. 这项研究揭示了先天免疫力与ER引起的炎症性疾病之间的新联系.
科学领域:
- 细胞生物学
- 免疫学
- 分子生物学
背景情况:
- 内质网膜压力与克罗恩病和2型糖尿病等炎症性疾病有关.
- 激素应激激发蛋白质反应,包括像IRE1α这样的受体,通过NF-κB通路启动炎症信号.
- 模式识别受体 (PRR) 通常在检测损伤或感染时引发炎症,但它们在ER压力诱导的炎症中的作用尚不清楚.
研究的目的:
- 研究特定PRR在ER压力期间调解炎症的作用.
- 在ER压力诱导的炎症中识别涉及IRE1α/TRAF2信号通路的关键PRR.
主要方法:
- 在小鼠和人类细胞模型中使用了ER压力诱导剂 (thapsigargin,dithiothreitol) 和细菌感染 (Brucella abortus).
- 评估了促炎性细胞因子 (IL-6) 的产生和信号通路 (TRAF2,NOD1/2,RIP2).
- 使用ER压力抑制剂 (tauroursodeoxycholate) 和IRE1α激酶抑制剂来调节炎症反应.
主要成果:
- 确定NOD1和NOD2是ER压力诱导炎症的关键媒介.
- 在NOD1/ 2依赖的情况下,ER应激诱导剂和Brucella abortus感染触发了IL-6的产生.
- 炎症和IL-6的产生依赖于TRAF2,NOD1/2和RIP2,并因ER压力和IRE1α抑制而减少.
结论:
- NOD1和NOD2在ER压力诱导的炎症中起着重要作用.
- 这项研究确定了先天免疫 (NOD1/2) 和ER应激信号 (IRE1α/TRAF2) 之间的新联系.
- 这些发现为与ER压力相关的炎症疾病背后的机制提供了新的见解.
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