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- W2111640802 abstract "We have shown previously that the pathways leading to Fas-mediated apoptosis in prostatic carcinoma cell lines are intact, because apoptosis can be triggered either by Fas ligation alone in the Fas-sensitive cell lines PC3 and ALVA31 or by rendering the Fas-resistant cell lines DU145 and JCA1 Fas-sensitive by combined treatment with anti-Fas monoclonal antibody and cycloheximide (O. W. Rokhlin et al., Cancer Res., 57: 1758-1768, 1997). In this study, we demonstrate that two of the early events after Fas ligation are the release of cytochrome c from the mitochondria and activation of caspase-9. We also found that Bid is processed after Fas ligation and thus might activate the mitochondria-dependent apoptotic cascade. In a cell-free system, cytochrome c induced caspase-3-like activity in cytoplasmic extracts from all four cell lines studied, although differences in the level of enzymatic activity were observed. Western blot analysis revealed that caspase-7 is activated by cytochrome c at the same level in all extracts, whereas expression and activation of caspase-3 varied considerably. Cytochrome c-activated extracts displayed different abilities in the induction of apoptotic features in isolated nuclei such as morphological changes and DNA fragmentation. However, differences in nuclear apoptotic activity induced by cytochrome c did not correlate with the level of caspase-3 like activity in the different extracts. These results suggest that the mitochondrial pathway is involved in Fas-mediated apoptosis in prostatic carcinoma cell lines and that, in addition to caspase-7 and caspase-3, there are other factors that confer nuclear apoptotic activity." @default.
- W2111640802 created "2016-06-24" @default.
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- W2111640802 date "2000-04-15" @default.
- W2111640802 modified "2023-09-23" @default.
- W2111640802 title "Cytochrome c is involved in Fas-mediated apoptosis of prostatic carcinoma cell lines." @default.
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