由于含有微生物DNA的肠外细胞囊泡,CRIg+巨细胞缺乏增加IBD的炎症损伤
Shangshu Nie1, Zhongchao Zhang1, Yudong Ji2
1Department of Gastroenterology, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Gut microbes
|July 18, 2024
概括
肠道细胞外囊泡 (mEVs) 中的微生物DNA在免疫球蛋白超级家族巨细胞 (CRIg+Mφ) 的补充受体缺乏时,在炎症性肠病 (IBD) 中恶化肠道炎症. 阻断cGAS/STING通路可以减少这种炎症.
科学领域:
- 胃肠道学和免疫学
- 微生物组研究 微生物组研究
- 细胞信号通道 细胞信号通道
背景情况:
- 由肠道微生物群衍生的细胞外囊泡 (mEVs) 提供细菌产品,影响宿主炎症反应.
- 免疫球蛋白超级家族巨细胞的补充受体 (CRIg+Mφ) 对于清除细菌入侵者至关重要.
- 炎症性肠病 (IBD) 的特点是慢性肠道炎症.
研究的目的:
- 研究CRIg+Mφ在由mEVs介导的肠炎中的作用.
- 阐明mEVs调节IBD肠道炎症的机制.
- 为了确定mEVs诱导的炎症的治疗点.
主要方法:
- 在IBD患者和大肠炎小鼠模型中分析mEVs和CRIg+Mφ.
- 研究微生物DNA在mEVs作为炎症触发器.
- 评估cGAS/STING信号通路在mEVs介导的炎症中的参与.
- 评估cGAS/STING通路抑制作为一种治疗策略.
主要成果:
- 在IBD和结肠炎模型中,从受损的肠道微生物群中泄漏的mEV会加剧肠道炎症.
- 在IBD患者中,CRIg+Mφ显著降低,从而促进mEV的传播.
- 在mEVs中的微生物DNA引发炎症,并通过cGAS/STING通路破坏肠道屏障.
- 阻断cGAS/STING信号有效缓解由mEVs泄漏和CRIg+Mφ缺乏引起的炎症.
结论:
- 含微生物DNA的mEVs,加上CRIg+Mφ缺乏,在IBD中驱动炎症.
- cGAS/STING通路是mEVs诱导的炎症损伤的关键调解者.
- 针对cGAS/STING通路提供了IBD管理的潜在治疗方法.
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