奥图林在炎症和感染期间保护肠道上皮细胞免受亡
Lien Verboom1,2, Christopher J Anderson1,2,3, Maude Jans1,2
1VIB Center for Inflammation Research, 9052, Ghent, Belgium.
Cell death & disease
|August 19, 2023
概括
肠道细胞中具有线性结合特异性 (OTULIN) 的OTU二维基因酶缺乏会增加对结肠炎和沙门氏菌感染的易感性. 这是由于TNF信号受损而引起的,导致上皮细胞死亡和肠道屏障功能受损.
科学领域:
- 胃肠病学 胃肠病学
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
背景情况:
- 肠上皮形成了一个关键的屏障,将肠道微生物群与宿主组织分开.
- 障碍屏障功能受损是炎症性肠病 (IBD) 的标志.
- 与线性链接特异性 (OTULIN) 相关的自炎症综合征 (ORAS) 涉及严重的炎症,包括肠道病理.
研究的目的:
- 为了研究OTULIN在维持肠道上皮质屏障完整性的作用.
- 阐明OTULIN缺乏影响肠道炎症和TNF敏感性的机制.
- 评估OTULIN对大肠炎和肠道感染易感性的贡献.
主要方法:
- 产生具有肠上皮细胞 (IEC) 特定的OTULIN缺乏症的小鼠.
- 试验性结肠炎的诱导和对TNF毒性敏感性的评估.
- 在IEC中分析TNF受体信号通路和亡反应.
- 对沙门氏菌Typhimurium感染的敏感性评估.
主要成果:
- 特定于IEC的OTULIN缺乏导致对实验性结肠炎的敏感性增加,对TNF毒性的敏感性增加.
- 在TNF刺激时,OTULIN缺乏IECs由于TNF受体复合物I形成和LUBAC招募受损而表现出过度的亡.
- 奥图林缺乏会加剧慢性TNF暴露的小鼠的肠道病理,并增加对沙门氏菌感染的易感性.
- 奥图林在肠道上皮质中起到关键的抗亡蛋白的作用,保持屏障完整性.
结论:
- 奥图林对于防止肠上皮细胞的亡至关重要,特别是在炎症条件下.
- 奥图林缺乏会破坏TNF信号传递,促进上皮细胞死亡和胃肠道炎症.
- 这些发现为ORAS的肠道表现提供了机理性的见解,并突出了OTULIN在肠道健康中的作用.
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