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• W2093961234 abstract "Abstract The ability to inappropriately progress through S phase during drug treatment is a key determinant of tumor cell sensitivity to thymidylate synthase inhibitors such as 5-fluoro-2′-deoxyuridine (FdUrd). Previous studies suggest that SW620 cells, which are relatively resistant to FdUrd, have an intact early S-phase checkpoint that protects against FdUrd-induced DNA damage and cytotoxicity and that this checkpoint is defective in the relatively sensitive HT29 cells, which continue to progress through S phase during drug treatment. To test this hypothesis, we examined the expression and activation of known S-phase checkpoint mediators in FdUrd-treated SW620 and HT29 cells. FdUrd induced degradation of cdc25A in SW620, but not HT29 cells, in a manner that correlated with the previously described drug-induced S-phase arrest. This difference, however, could not be attributed to differences in either chk1 activation, which was similar in both cell lines, or chk2 activation, which only occurred in HT29 cells and correlated with uracil misincorporation/misrepair-induced DNA double-stranded breaks. These observations suggest that although FdUrd-induced S-phase arrest and associated cdc25A degradation are impaired in HT29 cells, signaling by ATM/ATR is intact upstream of chk1 and chk2. Finally, FdUrd induced premature mitotic entry, a phenomenon associated with deregulated cdc25A expression, in HT29 but not SW620 cells. Blocking cdc25A expression in HT29 cells with small interfering RNA attenuated FdUrd-induced premature mitotic entry, suggesting that progression of HT29 cells through S phase during drug treatment results in part from the inability of these cells to degrade cdc25A in response to FdUrd-induced DNA damage." @default.
• W2093961234 created "2016-06-24" @default.
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• W2093961234 date "2004-09-15" @default.
• W2093961234 modified "2023-09-25" @default.
• W2093961234 title "5-Fluoro-2′-Deoxyuridine-Induced cdc25A Accumulation Correlates with Premature Mitotic Entry and Clonogenic Death in Human Colon Cancer Cells" @default.
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• W2093961234 doi "https://doi.org/10.1158/0008-5472.can-03-3040" @default.
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