通过促进与IL-2灭树突细胞的相互作用,EBI2增加了Tfh细胞命运
Jianhua Li1,2,3, Erick Lu1,2, Tangsheng Yi1,2
1Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, California 94143, USA.
Nature
|May 6, 2016
概括
G蛋白结合受体EBI2引导T毛囊辅助细胞 (Tfh) 到特定位置,而树突细胞则使用CD25控制IL-2并促进Tfh细胞分化以获得强大的免疫反应.
科学领域:
- 免疫学
- 细胞生物学
- 分子生物学
背景情况:
- 毛囊T辅助细胞 (Tfh) 对于适应性免疫至关重要,支持B细胞反应和生殖中心的形成.
- 导向Tfh细胞在淋巴组织中的分化和局部化的精确机制尚不完全理解.
- 虽然CXCR5是Tfh细胞的定义标志物,但激活的CD4T细胞对T-B细胞边界的初始引导尚不清楚.
研究的目的:
- 阐明EBI2在T区内激活的CD4T细胞的定位中的作用.
- 研究树突细胞如何影响Tfh细胞分化,特别是关于IL-2的可用性.
- 了解Tfh细胞命运决定中的细胞局部化,共刺激和细胞因子信号之间的相互作用.
主要方法:
- 使用T细胞 (EBI2缺乏) 和树突细胞 (CD25缺乏) 的基因修饰的小鼠模型.
- 分析了T细胞局部化,Tfh细胞分化标志物和生殖中心反应.
- 研究了在淋巴细胞中激活的T细胞,树突细胞和细胞因子信号传递 (IL-2) 之间的相互作用.
主要成果:
- EBI2及其连接体7α,25-二胆固醇介导激活的CD4T细胞在T-B细胞接口的定位.
- 在T区激活的树突细胞产生CD25,灭T细胞衍生IL-2并促进Tfh细胞分化.
- 缺乏T细胞EBI2或树突细胞CD25的小鼠表现出Tfh细胞减少和T细胞依赖免疫反应受损.
结论:
- 在T区内, 特定的位决定了T细胞的命运.
- 在调节IL-2可用性和Tfh细胞分化方面,来自状细胞的CD25起着至关重要的作用.
- 对于有效的Tfh细胞反应和幽默免疫,EBI2介导的定位和CD25依赖的IL-2调节至关重要.
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