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RIPK1通过保护上皮质免受亡的作用来确保肠道平衡
Nozomi Takahashi1, Lars Vereecke1, Mathieu J M Bertrand1
11] VIB Inflammation Research Center, Technologiepark 927, B-9052 Ghent, Belgium [2] Department of Biomedical Molecular Biology, Ghent University, Technologiepark 927, B-9052 Ghent, Belgium.
Nature
|September 5, 2014
概括
受体相互作用蛋白激酶1 (RIPK1) 对于肠上皮细胞 (IEC) 存活至关重要,防止编程细胞死亡和维持肠道平衡. 它的酶独立功能保护肠道内膜免受亡.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 胃肠病学 胃肠病学
背景情况:
- 受体相互作用蛋白激酶1 (RIPK1) 是一个关键的信号分子,参与细胞死亡和生存途径.
- 它在肠上皮细胞 (IEC) 中的确切作用及其促进生存或细胞死亡的双重功能由于完全淘汰模型中的早期致死性而不明确.
研究的目的:
- 研究RIPK1在IEC中的特定作用及其对肠道平衡的贡献.
- 阐明RIPK1调节肠道细胞死亡和炎症的机制.
主要方法:
- 在特定的IEC中产生缺乏RIPK1的RIPK1条件淘汰小鼠.
- 分析肠道炎症,IEC亡,以及淘汰小鼠死亡率.
- 涉及抗生素治疗,MYD88缺乏,TNF受体1缺乏和CASP8缺乏的救援实验.
- 对RIPK1酶死亡的试验小鼠和肠道有机体培养物的评估.
主要成果:
- 特定于IEC的RIPK1缺乏导致了自发的严重肠道炎症,IEC亡和早期死亡.
- 杀伤性被抗生素,MYD88缺乏或TNF受体1缺乏所挽救,突出了共生细菌和TNF的作用.
- CASP8缺乏,但不是RIPK3缺乏,完全挽救了炎症表型,表明RIPK1在抑制CASP8依赖性亡中的作用.
- 在RIPK1酶死亡的小鼠中,没有出现炎症,这表明酶独立的平台功能.
- 有机体研究证实了RIPK1在预防TNF诱导的亡中的作用,独立于NF-κB激活.
结论:
- RIPK1对于IEC的生存和肠上皮质恒常是必不可少的.
- RIPK1通过一种酶独立的机制保护肠道上皮从CASP8-介导的亡.
- 这一功能对于预防炎症和保持肠道屏障完整性至关重要.
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