肠上皮的TLR5信号传递促进了支屏障的巨细胞
Ming-Ting Tsai1,2, Ryann Callaghan2,3, Charles Ng4
1Molecular Virology and Microbiology Graduate Program, Baylor College of Medicine, Houston, TX, USA.
Science immunology
|January 16, 2026
概括
大肠杆菌的鞭毛素通过表皮Toll类受体5 (TLR5) 发出信号,诱导C-C化学因子联结物2 (CCL2) 的产生. 这招募C-C化学因受体2 (CCR2) +单细胞,补充肠道巨细胞并促进表皮屏障修复.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 胃肠病学 胃肠病学
背景情况:
- 肠道巨细胞对于维持上皮屏障至关重要,并通过循环单细胞补充.
- 控制这种补充过程的微生物因素和宿主途径尚不清楚.
- 众所周知,体内微生物群对于这种恒温过程至关重要.
研究的目的:
- 为了阐明微生物因素和宿主途径参与肠道巨细胞补充.
- 研究大肠杆菌殖民在调节肠道免疫和屏障功能的作用.
- 了解微生物成分促进单细胞招募的机制.
主要方法:
- 用大肠杆菌分离物对小鼠进行殖民,并评估肠道病理和巨种群.
- 利用人类结肠器官来研究表皮细胞对大肠杆菌的反应.
- 研究了C-C化学基因配体2 (CCL2),鞭毛素和Toll-like受体5 (TLR5) 在单细胞招募和保护中的作用,使用淘汰赛小鼠和鞭毛素缺乏的细菌.
主要成果:
- 大肠杆菌菌殖民增加了C-C化学因子受体2 (CCR2) +巨体,并改善了结肠炎.
- 大肠杆菌诱导肠上皮干细胞分泌CCL2,促进单细胞迁移.
- 大肠杆菌中的高鞭蛋白表达与CCL2产生相关,并且表皮TLR5对鞭蛋白的感知对于单细胞的招募和保护至关重要.
结论:
- 由TLR5感知表皮鞭是招募CCR2+巨细胞到肠道的关键途径.
- 这种微生物与宿主之间的相互作用促进了肠道上皮质屏障的修复.
- 特定的大肠杆菌成分,如鞭毛素,可以治疗性地增强宿主防御机制.
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