由TGF-β诱导的Foxp3通过对抗RORgammat功能来抑制T(H) 17细胞分化
Liang Zhou1, Jared E Lopes, Mark M W Chong
1The Kimmel Center for Biology and Medicine of the Skirball Institute, New York University School of Medicine, New York, New York 10016, USA.
Nature
|March 28, 2008
概括
转化生长因子-β (TGF-β) 度决定了T助手17 (T(H) 17和调控性T (T(reg)) 细胞的分化. 低TGF-β促进T(H) 17细胞,而高TGF-β则通过平衡RORgammat和Foxp3转录因子,有利于T(reg) 细胞.
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:
- 辅助性T细胞17 (T) 和调节性T细胞在免疫和炎症中起着相反的作用.
- 两种T(H) 17和T(reg) 细胞分化都需要转化生长因子-β (TGF-β),但由不同的转录因子RORgammat和Foxp3分别调节.
- 通过TGF-β调节这些对立的T细胞子集的分化的精确机制仍然不清楚.
研究的目的:
- 阐明转化生长因子-β (TGF-β) 度如何依赖性地调节T辅助细胞17 (T(H) 17和调节性T (T(reg)) 细胞的分化.
- 研究RORgammat和Foxp3转录因子在T细胞谱系中的相互作用.
- 了解IL-6,IL-21和IL-23等细胞因子在调节T细胞分化中的作用.
主要方法:
- 在不同的TGF-β度下对原始CD4+T细胞进行体外分化.
- 对转录因子表达 (RORgammat和Foxp3) 和细胞因子产生 (IL-17) 的分析.
- 评估小鼠小肠内自身层中的T细胞种群.
主要成果:
- TGF-β以度依赖的方式调节T (H) 17和T (reg) 细胞的分化.
- 低TGF-β度通过上调IL-23受体 (Il23r) 表达促进T(H) 17细胞分化,而高度则有利于T(reg) 细胞.
- 福克斯p3可以抑制RORgammat功能,而这种抑制是由细胞因子IL-6,IL-21和IL-23缓解的,促进T(H) 17细胞分化.
结论:
- 抗原刺激的T细胞的分化命运变成T (H) 17或T (reg) 细胞是由细胞因子环境和由此产生的RORgammat和Foxp3.3之间的平衡决定的.
- TGF-β度是指导T细胞系承诺的关键因素.
- 这项研究提供了一种分子机制,说明了如何产生对立的T细胞群体以维持免疫平衡.
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