通过TNF-α前信号,NEMO和RIP1控制细胞命运,以应对广泛的DNA损伤
1Department of Molecular Oncology, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.
Cell
|April 5, 2011
概括
在DNA受损后,阿塔克西亚特朗吉克塔西亚突变 (ATM) 激酶信号会释放细胞因子和亡. 这项研究揭示了一个p53独立的途径,涉及NF-κB和RIP1激酶,对于细胞命运决定至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 对DNA损伤反应的分子机制
背景情况:
- DNA 损伤会触发由阿塔克西亚-泰朗吉克塔西亚突变 (ATM) 激酶介导的细胞反应.
- ATM通过NF-κB促进细胞存活,但其在细胞因子产生和亡中的作用尚不清楚.
- 关于ATM在对基因毒性压力的反应中信号通路的现有知识差距.
研究的目的:
- 阐明ATM在广泛的DNA损伤后诱导细胞因子分泌和亡的p53独立机制.
- 识别关键信号分子和参与ATM介导细胞命运决定的途径.
主要方法:
- 使用细胞模型研究了DNA损伤反应途径.
- 分析了依赖于ATM和NEMO/IKK-γ的顺序NF-κB激活阶段.
- 研究了TNF-α-TNFR1信号传导,RIP1激酶,JNK3/MAPK10和FADD在下游信号传导中的作用.
主要成果:
- 在广泛的DNA病变时发现了两个连续的NF-κB激活阶段,依赖于ATM和NEMO/IKK-γ.
- 确定了促进RIP1酸化的TNF-α-TNFR1前信号.
- 通过JNK3 / MAPK10和FADD分别证明了RIP1激酶介导的白蛋白-8分泌和卡斯帕酶-8激活.
结论:
- 通过自身的TNF-α信号传递,ATM利用NEMO和RIP1激酶来激活细胞因子的产生和亡,以应对过度的DNA损伤.
- 这种p53独立的途径为在基因毒性压力后的细胞命运调节提供了关键的见解.
- 这些发现突出了一个新的机制,控制了细胞在生存和消灭之间做出的决定.
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