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Intracellular activation of sphingomyelinase, leading to ceramide generation, and ICE-like proteases have been implicated in TNF and Fas-induced apoptosis, but the links between these intracellular apoptotic mediators remain undefined. We show here that a specific peptide inhibitor of the ICE-like protease CPP32/Yama (DEVD-cho) blocks anti-Fas-induced apoptosis in Jurkat and U937 cells, while having...
It has been proposed that TNF cytotoxicity is mediated by reactive oxygen intermediates generated by uncoupling of mitochondrial respiration. We have compared sensitive U937 cells and derived cell lines depleted of mtDNA for their ability to undergo TNF- and Fas-induced apoptosis. Cells lacking around 98% of mtDNA were still sensitive to TNF-induced apoptosis. U937 cells devoid of mtDNA (U937-p°)...
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