A RIPK3-caspase 8 complex mediates atypical pro-IL-1β processing.

A RIPK3-caspase 8 complex mediates atypical pro-IL-1β processing.
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DOI:
10.4049/jimmunol.1402167
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发表时间:
2015-02-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Chan FK
Chan FK
中科院分区:
其他
文献类型:
--
作者:
Moriwaki K;Bertin J;Gough PJ;Chan FK

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Caspase 8是死亡受体诱导凋亡的起始因子,是受体相互作用蛋白激酶3(RIPK 3)的负调节因子,RIPK 3是TNF、TLR 3或TLR 4诱导的坏死性凋亡的关键因子。在某些情况下,caspase 8也可以参与pro-IL-1β加工。然而,介导半胱天冬酶8介导的加工的生物化学复合物没有被定义。在这里,我们表明RIPK 3是至关重要的半胱天冬酶1和半胱天冬酶8介导的pro-IL-1β和pro-IL-18在BMDCs处理响应LPS刺激。Caspase 8介导的pro-IL-1β加工需要完整的RIPK 1、RIPK 3、TRIF和FADD。响应于LPS,形成含有RIPK 1、RIPK 3、FADD和半胱天冬酶8的复合物。令人惊讶的是,在LPS刺激的BMDC中,RIPK 3特异性激酶抑制剂强烈增强胱天蛋白酶8活化和pro-IL-1β加工。然而,在表达激酶失活的RIPK 3-K51 A突变体或RIPK 1-K45 A突变体的BMDC中的研究表明,LPS诱导的caspase 8活化和IL-1β分泌都不需要RIPK 1或RIPK 3的激酶活性。因此,RIPK 3是促进BMDC中IL-1β成熟的胱天蛋白酶8活性的意想不到的正调节剂。
Caspase 8, the initiator caspase for death receptor induced apoptosis, functions as a negative regulator of receptor interacting protein kinase 3 (RIPK3), an essential factor for TNF-, TLR3- or TLR4-induced necroptosis. In certain situations, caspase 8 can also participate in pro-IL-1β processing. However, the biochemical complex that mediates caspase 8-mediated processing is not defined. Here, we show that RIPK3 is crucial for caspase 1- and caspase 8-mediated pro-IL-1β and pro-IL-18 processing in BMDCs in response to LPS stimulation. Caspase 8-mediated pro-IL-1β processing requires intact RIPK1, RIPK3, TRIF and FADD. In response to LPS, a complex that contains RIPK1, RIPK3, FADD and caspase 8 is formed. Surprisingly, RIPK3-specific kinase inhibitors strongly enhanced caspase 8 activation and pro-IL-1β processing in LPS-stimulated BMDCs. However, studies in BMDCs expressing the kinase inactive RIPK3-K51A mutant or RIPK1-K45A mutant showed that neither the kinase activity of RIPK1 nor RIPK3 is required for LPS-induced caspase 8 activation and IL-1β secretion. Hence, RIPK3 is an unexpected positive regulator of caspase 8 activity that promotes IL-1β maturation in BMDCs.
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