TSLP/树突细胞轴促进CD4+T细胞对肠道微生物群的耐受性
JCI insight
|July 10, 2023
概括
胸膜层淋巴蛋白 (TSLP) 信号通常通过调节CD4+T细胞扩张和促进Treg分化来预防致命性结肠炎. 这种TSLP-dendritic细胞轴维持肠道对共生微生物的耐受性.
科学领域:
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
- 微生物学 微生物学
背景情况:
- 胸膜流体淋巴蛋白 (TSLP) 与亚托皮有关,但也存在于健康组织中,这表明它具有平静作用.
- 固有的TSLP在障碍器官恒温的功能,特别是在成年人的免疫调节中,仍然不清楚.
研究的目的:
- 调查内源TSLP信号在调节成年小鼠CD4+T细胞平衡中的作用.
- 阐明TSLP影响T细胞反应并维持结肠中外围耐受性的机制.
主要方法:
- 利用缺乏TSLP受体 (Rag1KOTslprKO) 的Rag1-淘汰赛小鼠来研究内源TSLP功能.
- 评估了CD4+ T细胞增殖,Treg分化,细胞因子产生和肠道微生物群的影响.
- 采用了生物和树突细胞共转移实验来研究结肠炎和耐受性的机制.
主要成果:
- Rag1KOTslprKO小鼠在 CD4+ T 细胞引入后发生致命性结肠炎,这表明耐受性丧失.
- 固体TSLP信号传递对于抑制CD4+T细胞增殖,促进Treg分化和维持恒常性细胞因子水平至关重要.
- 大肠炎的发展取决于肠道微生物群,耐受性可以通过对生物或野生型树突细胞的施用恢复.
- 在TslprKO小鼠中,结肠中的T细胞耐受性受到损害,在抗PD-1/抗CTLA-4疗法下恶化.
结论:
- 与树突细胞一起的TSLP信号,在结肠中建立了一个关键的外围耐受性轴.
- 这个轴积极抑制CD4+T细胞对开始性肠道微生物群的激活,防止诸如结肠炎等炎症状况.
- 这种TSLP-DC轴的干扰导致对微生物驱动的肠道炎症的耐受性和易感性丧失.
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