来自微生物群的IPA通过在炎症性肠病中升调Th1/Th17细胞亡来缓解肠粘膜炎症
Han Gao1, Mingming Sun1, Ai Li1
1Center for IBD Research and Department of Gastroenterology, The Shanghai Tenth People's Hospital of Tongji University, Shanghai, China.
肠道微生物代谢物英多尔-3-酸 (IPA) 在炎症性肠病 (IBD) 模型中通过通过热冲击蛋白70 (HSP70) 诱导T细胞亡来减少肠道炎症. 这一发现为IBD提供了新的治疗策略.
科学领域:
- 胃肠病学 胃肠病学
- 免疫学 免疫学 免疫学
- 微生物组研究 微生物组研究
背景情况:
- 炎症性肠病 (IBD) 的发病包括复杂的免疫失调.
- 肠道微生物群代谢物,如英多尔-3-酸 (IPA),在IBD中的作用仍然不完全理解.
- IPA对于肠粘膜平衡至关重要,但其在IBD中CD4+T细胞功能中的特定机制尚不清楚.
研究的目的:
- 研究IPA在IBD中调节粘膜CD4+T细胞中的作用.
- 探索IPA在治疗人类IBD中的治疗潜力.
- 阐明IPA对肠道炎症的影响背后的分子机制.
主要方法:
- 在IBD患者与健康捐赠者的菌群和IPA水平的比较分析.
- 建立和治疗急性 (DSS诱导) 和慢性 (CD45RB高CD4+T细胞转移) 大肠炎与IPA的小鼠模型.
- 评估炎症标志物,细胞因子水平,以及结肠组织的组织学变化.
- RNA测序,分子对接和表面等离子体共振来识别IPA的分子目标.
主要成果:
- IBD患者的IPA产生细菌和IPA水平降低,IPA消耗细菌增加.
- 口服IPA剂可显著减轻小鼠的结肠炎,减少炎症,促炎细胞因子 (TNF-α,IFN-γ,IL-17A) 和组织学损伤.
- 已确定IPA与热冲击蛋白70 (HSP70) 相互作用,诱导Th1/Th17细胞的亡,这种机制得到了HSP70过度表达研究的证实.
结论:
- 在IBD患者中,IPA水平发生变化,与特定的微生物转移相关.
- 在IBD的临床前模型中,IPA通过抑制粘膜炎症来证明治疗效果.
- IPA通过一种新的途径发挥其抗炎作用,涉及HSP70介导的Th1/Th17细胞亡的诱导,为IBD提供了一个有前途的治疗标.
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