剖析TNF受体1效应器功能:JNK激活与细胞亡无关,而NF-kappaB激活可以防止细胞死亡
1Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla 92093-0636, USA.
Cell
|November 1, 1996
概括
瘤坏死因子受体1 (TNFR1) 触发了不同的细胞通路. 瘤坏死因子 (TNF) 信号通过RIP/TRAF2激活JNK和NF-kappaB,而FADD则调解亡,NF-kappaB保护细胞免受TNF诱导的死亡.
科学领域:
- 细胞生物学 细胞生物学
- 分子信号传递是分子信号传递.
- 免疫学 免疫学 免疫学
背景情况:
- 细胞因子瘤坏死因子 (TNF) 通过其1型受体 (TNFR1) 产生各种生物效应.
- 已知TNFR1激活会诱导炎症,细胞死亡 (细胞亡),增殖和分化.
- 了解TNFR1下游的独特信号通路对于破译其复杂的角色至关重要.
研究的目的:
- 调查TNFR1激活关键下游效应因子的特定分子机制:JNK,NF-kappaB和亡.
- 阐明不同信号传感器在调解这些独特的细胞反应中的作用.
- 确定JNK激活,NF-kappaB激活和TNF诱导的亡之间的相互作用.
主要方法:
- 利用分子生物学技术来分析信号传感器对TNFR1复合体的招募.
- 研究了FADD,RIP和TRAF2在下游信号中介方面的作用.
- 评估了JNK和NF-kappaB通路的激活.
- 评估了这些途径对TNF诱导的亡的影响.
主要成果:
- 细胞亡是由FADD被招募到TNFR1复合体的介导,独立于JNK和NF-kappaB激活.
- 两种JNK和NF-kappaB激活均由RIP和TRAF2调解,但在TRAF2.2的下游分离.
- 在TNF诱导的亡中不需要JNK激活.
- 激活NF-kappaB可以防止TNF诱导的亡.
结论:
- TNFR1激活了亡,JNK和NF-kappaB的不同的信号通路.
- FADD特别参与了亡途径,而RIP和TRAF2则是JNK和NF-kappaB激活的核心.
- NF-kappaB信号传递作为一种生存途径,抵消TNF诱导的细胞死亡,而JNK并不涉及诱导亡.
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