在树突细胞上失去整合素alpha(v) beta8会导致小鼠自身免疫和大肠炎
Mark A Travis1, Boris Reizis, Andrew C Melton
1Lung Biology Center, Department of Medicine, University of California San Francisco, 1550 4th Street, Room 545, San Francisco, California 94158, USA.
Nature
|August 19, 2007
概括
在树突细胞上失去整合素α(v) beta8会触发炎症性肠病和自身免疫,因为它会损害转化生长因子β (TGF-β) 的激活和调节性T细胞诱导.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 转化生长因子-β (TGF-β) 是适应性免疫的关键调节者.
- TGF-β需要从一个不活跃的前体激活来调解其生物效应.
- 控制免疫系统中TGF-β激活和功能的机制尚未完全理解.
研究的目的:
- 研究整合素alpha(v) beta8在TGF-β激活和免疫调节中的作用.
- 确定alpha(v) beta8缺乏对免疫平衡和自身免疫性疾病的发展的影响.
主要方法:
- 条件淘汰赛小鼠模型缺乏特定免疫细胞群 (白细胞,树突细胞,T细胞) 上的alpha(v) beta8.
- 在淘汰赛小鼠中评估炎症性肠病和自身免疫表型.
- 在体外共同培养试验评估由树突细胞调节性T细胞诱导.
- 在结肠组织中分析T (R) 细胞群.
主要成果:
- 在白细胞上有条件的α(v) beta8损失导致严重的炎症性肠病和小鼠自身免疫.
- 特别是在树突细胞上的α(v) beta8缺乏症重现了在全球白细胞淘汰小鼠中观察到的自身免疫表型.
- 缺少alpha(v) beta8的树突细胞表现出TGF-β激活受损,导致调节性T细胞 (T(R细胞) 的诱导减少在体外和体内.
- 缺乏α(v) beta8的T细胞不会发展出这些免疫异常.
结论:
- 树突细胞上的综合素alpha (v) beta8对于TGF-β介导的免疫调节至关重要.
- 树突细胞的α(v) beta8依赖的TGF-β激活对于预防炎症性肠病和自身免疫是至关重要的.
- 这一途径在诱导和/或维持组织调节T细胞方面发挥着重要作用.
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