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- W2106751562 abstract "Cellular oncogenes have been shown to play crucial roles in the cell death process induced by cytotoxic agents. In this study, we have demonstrated that v-H-ras transformed NIH 3T3 cells but not other transformants (v-raf, v-src, v-erbB-2, v-fes and v-mos) exhibited a survival advantage to treatment by a DNA-damaging agent, methylmethanesulfonate (MMS). Subsequently, the biochemical and morphologic criteria of MMS-treated cells were examined. It was found that MMS induced v-H-ras transformants to go through necrosis, but it induced other transformed cells to undergo apoptosis. The levels of glutathione (GSH) within each transformant as well as in NIH 3T3 cells, were determined. The results showed that GSH levels within ras transformants were 2- to 7-fold higher than the levels in other transformants and normal NIH 3T3 cells. By using the GSH synthesis inhibitor buthionine sulfoximine, GSH levels were artificially reduced. This depletion, however, made ras transformed cells more sensitive to MMS killing, but the mode of cell death was still necrosis. Western blot analysis demonstrated that the anti-apoptotic protein Bcl-2 was constitutively expressed in ras transformed cells but not in NIH 3T3 or other transformed cells. The level of Bcl-2 was correlated with the resistant phenotype of ras transformants during MMS treatment. These observations suggest that GSH and Bcl-2 levels may cooperatively confer the resistant phenotype of ras transformants in response to MMS. In addition, the mode of cell death may possibly be determined at least in part by Bcl-2 protein." @default.
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- W2106751562 date "1996-08-01" @default.
- W2106751562 modified "2023-10-04" @default.
- W2106751562 title "Differential induction of apoptosis in oncogene-transformed NIH 3T3 cells by methylmethanesulfonate" @default.
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- W2106751562 doi "https://doi.org/10.1016/0006-2952(96)00251-1" @default.
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