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- W2068961205 abstract "Abstract We studied the effects of TNF-α and Fas-induced death signaling in hematopoietic stem and progenitor cells (HSPCs) by examining their contributions to the development of bone marrow failure syndromes in Tak1-knockout mice (Tak1−/−). We found that complete inactivation of TNF-α signaling by deleting both of its receptors, 1 and 2 (Tnfr1−/−r2−/−), can prevent the death of 30% to 40% of Tak1−/− HSPCs and partially repress the bone marrow failure phenotype of Tak1−/− mice. Fas deletion can prevent the death of 5% to 10% of Tak1−/− HSPCs but fails to further improve the survival of Tak1−/−Tnfr1−/−r2−/− HSPCs, suggesting that Fas might induce death within a subset of TNF-α-sensitive HSPCs. This TNF-α/Fas-induced cell death is a type of receptor-interacting protein-1 (RIP-1)–dependent programmed necrosis called necroptosis, which can be prevented by necrostatin-1, a specific RIP-1 inhibitor. In addition, we found that the remaining Tak1−/− HSPCs died of apoptosis mediated by the caspase-8–dependent extrinsic apoptotic pathway. This apoptosis can be converted into necroptosis by the inhibition of caspase-8 and prevented by inhibiting both caspase-8 and RIP-1 activities. We concluded that HSPCs are heterogeneous populations in response to death signaling stimulation. Tak1 mediates a critical survival signal, which protects against both TNF-α/Fas-RIP-1–dependent necroptosis and TNF-α/Fas-independent apoptosis in HSPCs." @default.
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- W2068961205 date "2011-12-01" @default.
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- W2068961205 title "TNF-α/Fas-RIP-1–induced cell death signaling separates murine hematopoietic stem cells/progenitors into 2 distinct populations" @default.
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- W2068961205 doi "https://doi.org/10.1182/blood-2011-06-359448" @default.
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