通过干扰素-马/STAT通路抑制转化生长因子-β/SMAD信号传递
1Cell Biology Program and Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
Nature
|March 6, 1999
概括
干扰素- (IFN-) 通过诱导Smad7来抑制转化生长因子-β (TGF-β) 信号传递,从而阻断Smad3的激活. 这揭示了STAT和SMAD通路之间的交叉对话,解释了它们对抗性的细胞效应.
科学领域:
- 细胞生物学 细胞生物学
- 分子信号传输的方法
- 免疫学 免疫学 免疫学
背景情况:
- 转化生长因子-β (TGF-β) 和干扰素- (IFN-) 对细胞功能表现出相反的影响.
- 这种对抗性背后的分子机制尚未完全理解.
- TGF-β信号涉及Smad2/3酸化,而IFN-信号则通过Jak1激活Stat1.
研究的目的:
- 阐明TGF-β和IFN-马信号通路之间的对抗性相互作用的分子基础.
- 为了确定整合这两个不同的信号传导级联的机制.
主要方法:
- 研究了IFN-对TGF-β诱导的Smad3酸化和下游事件的影响.
- 分析了Smad3/Smad4关联,核转位和基因激活.
- 研究了Jak1/Stat1在诱导Smad7表达中的作用.
- 评估Smad7在防止Smad3与TGF-β受体相互作用方面的功能.
主要成果:
- IFN-胺抑制了TGF-β诱导的Smad3酸化.
- IFN-gamma阻断了Smad3/Smad4复合体的形成,核积累和TGF-β响应基因的激活.
- 通过Jak1和Stat1,IFN-马诱导Smad7.7的表达.
- Smad7阻止Smad3与TGF-β受体相互作用,从而抑制TGF-β信号传递.
结论:
- 通过诱导Smad7通过Jak1/Stat1通路的表达,IFN-对抗TGF-β信号传递.
- 这项研究揭示了STAT和SMAD信号传导通路之间的转调机制.
- 这些发现为TGF-β和IFN-的对立细胞功能提供了分子基础.
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