The death domain kinase RIP1 links the immunoregulatory CD40 receptor to apoptotic signaling in carcinomas.

The death domain kinase RIP1 links the immunoregulatory CD40 receptor to apoptotic signaling in carcinomas.
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DOI:
10.1083/jcb.201003087
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发表时间:
2011-02-07
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Eliopoulos AG
Eliopoulos AG
中科院分区:
其他
文献类型:
--
作者:
Knox PG;Davies CC;Ioannou M;Eliopoulos AG

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RIP1是TRAF2复合物的一个组成部分,在响应CD40配体结合的caspase-8激活和肿瘤细胞杀伤中是必需的。CD40是肿瘤坏死因子(TNF)受体家族成员,因其在抗肿瘤免疫应答中的突出作用而被广泛认可。CD40连接对恶性细胞的免疫刺激作用可通过连接蛋白TRAF6与CD40结合而导致的生存信号中断而转换为凋亡。细胞凋亡的诱导需要一个与TRAF2相互作用的CD40基序,但在将受体结合的TRAF2动员到细胞质后,在胞质内诱导死亡的信号复合体内启动。我们证明受体相互作用蛋白1 (RIP1)是该复合体的一个组成部分,并且是CD40配体诱导的caspase-8激活和肿瘤细胞杀伤所必需的。RIP1 K63泛素连接酶cIAP1/2的降解放大了cd40介导的细胞毒性作用,而抑制RIP1 K63去泛素化酶CYLD则降低了这种作用。这种两步诱导凋亡的机制扩大了我们对TNF受体超家族中凋亡调节途径的共性的认识,并提供了TNF家族受体如何篡夺替代程序以实现不同细胞功能的一个有说服力的例子。
RIP1 is a component of a TRAF2 complex, required for caspase-8 activation and tumor cell killing in response to ligand binding of CD40. CD40, a tumor necrosis factor (TNF) receptor family member, is widely recognized for its prominent role in the antitumor immune response. The immunostimulatory effects of CD40 ligation on malignant cells can be switched to apoptosis upon disruption of survival signals transduced by the binding of the adaptor protein TRAF6 to CD40. Apoptosis induction requires a TRAF2-interacting CD40 motif but is initiated within a cytosolic death-inducing signaling complex after mobilization of receptor-bound TRAF2 to the cytoplasm. We demonstrate that receptor-interacting protein 1 (RIP1) is an integral component of this complex and is required for CD40 ligand-induced caspase-8 activation and tumor cell killing. Degradation of the RIP1 K63 ubiquitin ligases cIAP1/2 amplifies the CD40-mediated cytotoxic effect, whereas inhibition of CYLD, a RIP1 K63 deubiquitinating enzyme, reduces it. This two-step mechanism of apoptosis induction expands our appreciation of commonalities in apoptosis regulatory pathways across the TNF receptor superfamily and provides a telling example of how TNF family receptors usurp alternative programs to fulfill distinct cellular functions.
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