A novel role for RIP1 kinase in mediating TNFα production.

A novel role for RIP1 kinase in mediating TNFα production.
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RIP1激酶在介导TNFα产生中的新作用。

DOI:
10.1038/cddis.2012.64
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发表时间:
2012-06-14
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
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--
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受体相互作用蛋白1(Receptor-interacting protein 1,RIP 1)是一种丝氨酸/苏氨酸激酶,在死亡受体信号传导中具有激酶依赖性和激酶非依赖性作用。RIP 1的激酶活性是坏死性凋亡所必需的,坏死性凋亡是程序性细胞死亡的半胱天冬酶非依赖性途径。在某些细胞类型中,半胱天冬酶的抑制导致TNFα的自分泌产生,然后激活坏死性凋亡。在这里,我们描述了一个新的作用,RIP 1激酶在调节TNFα的生产后,半胱天冬酶抑制。半胱天冬酶抑制剂激活RIP 1激酶和另一种蛋白质EDD以介导JNK信号传导,从而刺激TNFα的Sp1依赖性转录。该途径不依赖于核因子κB,并且也在Smac模拟物/IAP拮抗剂治疗或TNF受体相关因子2(Traf 2)丧失后发生。这些发现暗示cIAP 1/2和Traf 2是该RIP 1激酶依赖性TNFα产生途径的负调节因子,并提示RIP 1激酶在某些条件下介导TNFα产生的新作用。
Receptor-interacting protein 1 (RIP1) is a Ser/Thr kinase with both kinase-dependent and kinase-independent roles in death receptor signaling. The kinase activity of RIP1 is required for necroptosis, a caspase-independent pathway of programmed cell death. In some cell types, the inhibition of caspases leads to autocrine production of TNFα, which then activates necroptosis. Here, we describe a novel role for RIP1 kinase in regulating TNFα production after caspase inhibition. Caspase inhibitors activate RIP1 kinase and another protein, EDD, to mediate JNK signaling, which stimulates Sp1-dependent transcription of TNFα. This pathway is independent of nuclear factor κB and also occurs after Smac mimetic/IAP antagonist treatment or the loss of TNF receptor-associated factor 2 (Traf2). These findings implicate cIAP1/2 and Traf2 as negative regulators of this RIP1 kinase-dependent TNFα production pathway and suggest a novel role for RIP1 kinase in mediating TNFα production under certain conditions.
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