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Activity of caspase-8 determines plasticity between cell death pathways

机译:caspase-8的活性决定了细胞死亡途径之间的可塑性

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Caspase-8 is a protease with both pro-death and pro-survival functions: it mediates apoptosis induced by death receptors such as TNFR1(1), and suppresses necroptosis mediated by the kinase RIPK3 and the pseudokinase MLKL2-4. Mice that lack caspase-8 display MLKL-dependent embryonic lethality(4), as do mice that express catalytically inactive CASP8(C362A)(5). Casp8(C362A/C362A)Mlkl(-/-) mice die during the perinatal period(5), whereas Casp8(-/-)Mlkl(-/-) mice are viable(4), which indicates that inactive caspase-8 also has a pro-death scaffolding function. Here we show that mutant CASP8(C362A) induces the formation of ASC (also known as PYCARD) specks, and caspase-1-dependent cleavage of GSDMD and caspases 3 and 7 in MLKL-deficient mouse intestines around embryonic day 18. Caspase-1 and its adaptor ASC contributed to the perinatal lethal phenotype because a number of Casp8(C362A/C362A)Mlkl(-/-)Casp1(-/-) and Casp8(C362A/C362A)Mlkl(-/-)Asc(-/-) mice survived beyond weaning. Transfection studies suggest that inactive caspase-8 adopts a distinct conformation to active caspase-8, enabling its prodomain to engage ASC. Upregulation of the lipopolysaccharide sensor caspase-11 in the intestines of both Casp8(C362A/C362A)Mlkl(-/-) and Casp8(C362A/C362A)Mlkl(-/-)Casp1(-/-) mice also contributed to lethality because Casp8(C362A/C362A)Mlkl(-/-)Casp1(-/-)Casp11(-/-) (Casp11 is also known as Casp4) neonates survived more often than Casp8(C362A/C362A)Mlkl(-/-)Casp1(-/-) neonates. Finally, Casp8(C362A/C362A)Ripk3(-/-)Casp1(-/-)Casp11(-/-) mice survived longer than Casp8(C362A/C362A)Mlkl(-/-)Casp1(-/-)Casp11(-/-) mice, indicating that a necroptosis-independent function of RIPK3 also contributes to lethality. Thus, unanticipated plasticity in death pathways is revealed when caspase-8-dependent apoptosis and MLKL-dependent necroptosis are inhibited.
机译:Caspase-8是一种具有促死亡和促生存功能的蛋白酶:它介导由诸如TNFR1(1)之类的死亡受体诱导的凋亡,并抑制由激酶RIPK3和假激酶MLKL2-4介导的坏死病。缺乏caspase-8的小鼠表现出MLKL依赖的胚胎致死性(4),表达无催化作用的CASP8(C362A)(5)的小鼠也是如此。 Casp8(C362A / C362A)Mlkl(-/-)小鼠在围生期死亡(5),而Casp8(-/-)Mlkl(-/-)小鼠则是可行的(4),这表明caspase-8也无效具有促死的脚手架功能。在这里,我们显示突变体CASP8(C362A)诱导形成ASC(也称为PYCARD)斑点,并在胚胎第18天左右的MLKL缺陷小鼠肠中GSDMD以及caspase 3和7的caspase-1依赖性裂解。及其衔接子ASC有助于围产期致死表型,因为许多Casp8(C362A / C362A)Mlkl(-/-)Casp1(-/-)和Casp8(C362A / C362A)Mlkl(-/-)Asc(-/- )小鼠在断奶后存活。转染研究表明,不活跃的caspase-8与活跃的caspase-8具有不同的构象,从而使其前结构域与ASC结合。 Casp8(C362A / C362A)Mlkl(-/-)和Casp8(C362A / C362A)Mlkl(-/-)Casp1(-/-)小鼠肠道中脂多糖传感器caspase-11的上调也造成了致命性,因为Casp8(C362A / C362A)Mlkl(-/-)Casp1(-/-)Casp11(-/-)(Casp11也称为Casp4)新生儿的存活率比Casp8(C362A / C362A)Mlkl(-/-)Casp1高(-/-)新生儿。最后,Casp8(C362A / C362A)Ripk3(-/-)Casp1(-/-)Casp11(-/-)小鼠的存活时间比Casp8(C362A / C362A)Mlkl(-/-)Casp1(-/-)Casp11( -/-)小鼠,表明RIPK3的坏死病独立功能也有助于致死率。因此,当caspase-8依赖的细胞凋亡和MLKL依赖的坏死病被抑制时,死亡途径中的意外可塑性被揭示。

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