Survival function of the FADD-CASPASE-8-cFLIP(L) complex.

Survival function of the FADD-CASPASE-8-cFLIP(L) complex.
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DOI:
10.1016/j.celrep.2012.03.010
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发表时间:
2012-05-31
期刊:
影响因子:
8.8
通讯作者:
Green DR
Green DR
中科院分区:
生物学1区
文献类型:
--
作者:
Dillon CP;Oberst A;Weinlich R;Janke LJ;Kang TB;Ben-Moshe T;Mak TW;Wallach D;Green DR

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缺乏半胱天冬酶-8、FADD或cFLIP的小鼠在E10.5时存在卵黄囊血管化和胚胎致死性缺陷。RIPK 3是一种促进一种形式的坏死细胞死亡的激酶,最近已显示切除RIPK 3可挽救caspase-8缺陷动物的胚胎致死率。在这里,我们表明,虽然FADD,RIPK 3双敲除正常发展,cFLIP缺失的致死作用并没有被RIPK 3缺陷所拯救。值得注意的是,缺乏FADD、cFLIP和RIPK 3的胚胎发育正常。在E9.5 FLIP、RIPK 3双敲除胚胎中观察到不同的凋亡区域,但在caspase-8−/−或FADD−/−胚胎中没有观察到。使用死亡受体刺激的体外研究表明,FADD-半胱天冬酶-8-cFLIPL复合物阻断RIPK 3依赖性坏死,而cFLIPL阻断由FADD-半胱天冬酶-8复合物促进的RIPK 3非依赖性细胞凋亡。总之,这些结果表明在发育和死亡受体信号传导中的两个不同过程的交叉调节:由FADD-胱天蛋白酶-8-cFLIPL复合物的酶活性控制的RIPK 3依赖性信号传导(包括坏死),以及由FADD-胱天蛋白酶-8控制的RIPK 3独立性凋亡的cFLIPL。
Mice deficient in caspase-8, FADD, or cFLIP, present defects in yolk sac vascularization and embryonic lethality at E10.5. Ablation of RIPK3, a kinase that promotes a form of necrotic cell death, has recently been shown to rescue embryonic lethality in caspase-8 deficient animals. Here we show that while FADD, RIPK3 double knockouts develop normally, the lethal effects of cFLIP deletion are not rescued by RIPK3 deficiency. Remarkably, embryos lacking FADD, cFLIP, and RIPK3 develop normally. Distinct regions of apoptosis were observed in E9.5 FLIP, RIPK3 double knockout embryos, but not in caspase-8−/− or FADD−/− embryos. In vitro studies using death receptor stimulation show that the FADD-caspase-8-cFLIPL complex blocks RIPK3-dependent necrosis, while cFLIPL blocks RIPK3-independent apoptosis promoted by the FADD-caspase-8 complex. Together, these results suggest the cross-regulation of two distinct processes in development and death-receptor signaling: RIPK3-dependent signaling (including necrosis) controlled by the enzymatic activity of the FADD-caspase-8-cFLIPL complex, and cFLIPL control of RIPK3-independent apoptosis by FADD-caspase-8.
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发表时间: 2011-03-17
期刊: NATURE
影响因子: 64.8
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发表时间: 2007-10-01
影响因子: 4.8
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