在TNF-RII和c-IAP1的介导下,TRAF2的泛化和降解发生
Xiaoming Li1, Yili Yang, Jonathan D Ashwell
1Laboratory of Immune Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
Nature
|March 22, 2002
概括
结合TNF-RII的瘤坏死因子-α (TNF-α) 触发了通过c-IAP1 E3结合酶活动的TRAF2无化和降解. 这种机制增强了TNF诱导的亡,揭示了c-IAP1在TNF信号通路中的关键作用.
科学领域:
- 蜂信号传输是如何进行的
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 瘤坏死因子-α (TNF-α) 是一种关键的炎症媒介,与TNF受体 (TNF-RI,TNF-RII) 结合.
- TNF受体信号传递涉及像TNF-R相关因子 (TRAFs) 这样的适应蛋白,包括TRAF2,对JNK激活,NF-kappaB激活和抗亡信号至关重要.
- 亡抑制剂 (IAP),如c-IAP1和c-IAP2,具有E3泛基因酶活性,但它们在TNF受体信号传递中的作用尚不清楚.
研究的目的:
- 研究IAPs,特别是c-IAP1在TNF受体信号传递中的功能.
- 阐明c-IAP1影响TRAF2稳定性和TNF-α介导细胞反应的机制.
- 为了确定c-IAP1活性是否对TNF诱导的亡至关重要.
主要方法:
- 研究了TNF-α刺激时TNF-RII,TRAF2和c-IAP1之间的相互作用.
- 在存在c-IAP1.1的情况下,评估了TRAF2的泛化和蛋白质体降解.
- 利用野生型和E3缺陷c-IAP1突变来评估它们对TRAF2降解和亡的影响.
主要成果:
- 与TNF-RII结合的TNF-alpha诱导了TRAF2.2的全方位化和蛋白质体降解.
- c-IAP1直接与TRAF2结合,并介导其无处不在,取决于其E3酶活性.
- 野生类型c-IAP1的表达导致了TRAF2的无处不在和降解,而E3缺陷突变抑制了TNF-α诱导的TRAF2降解和亡.
结论:
- 确定了c-IAP1在TNF受体信号传递中的生理作用.
- 建立了一个机制,其中TNF-RII调节的c-IAP1泛素酶活性促进TRAF2降解.
- 证明这种c-IAP1-介导的TRAF2降解会增强TNF诱导的亡.
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