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- W2110029891 abstract "This study assesses the controversial role of the mitochondrial permeability transition (MPT) in apoptosis. In primary rat hepatocytes expressing an IκB superrepressor, tumor necrosis factor alpha (TNFα) induced apoptosis as shown by nuclear morphology, DNA ladder formation, and caspase 3 activation. Confocal microscopy showed that TNFα induced onset of the MPT and mitochondrial depolarization beginning 9 h after TNFα treatment. Initially, depolarization and the MPT occurred in only a subset of mitochondria; however, by 12 h after TNFα treatment, virtually all mitochondria were affected. Cyclosporin A (CsA), an inhibitor of the MPT, blocked TNFα-mediated apoptosis and cytochrome c release. Caspase 3 activation, cytochrome c release, and apoptotic nuclear morphological changes were induced after onset of the MPT and were prevented by CsA. Depolarization and onset of the MPT were blocked in hepatocytes expressing ΔFADD, a dominant negative mutant of Fas-associated protein with death domain (FADD), or crmA, a natural serpin inhibitor of caspases. In contrast, Asp-Glu-Val-Asp-cho, an inhibitor of caspase 3, did not block depolarization or onset of the MPT induced by TNFα, although it inhibited cell death completely. In conclusion, the MPT is an essential component in the signaling pathway for TNFα-induced apoptosis in hepatocytes which is required for both cytochrome c release and cell death and functions downstream of FADD and crmA but upstream of caspase 3." @default.
- W2110029891 created "2016-06-24" @default.
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- W2110029891 creator A5053799271 @default.
- W2110029891 date "1998-11-01" @default.
- W2110029891 modified "2023-10-11" @default.
- W2110029891 title "The Mitochondrial Permeability Transition Is Required for Tumor Necrosis Factor Alpha-Mediated Apoptosis and Cytochrome <i>c</i> Release" @default.
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- W2110029891 doi "https://doi.org/10.1128/mcb.18.11.6353" @default.
- W2110029891 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/109221" @default.
- W2110029891 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9774651" @default.
- W2110029891 hasPublicationYear "1998" @default.
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