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• W2104326487 abstract "Cytotoxicity and perturbations of the deoxyribonucleoside triphosphate pools caused by thymidine were studied in thymidine-sensitive and -resistant human tumor cells. Incubation with 1 mM thymidine reduced cell viability by more than 90% in the three sensitive cell lines (two melanomas and one adrenal carcinoma) and reduced the growth rate without decreasing the viability of resistant LO melanoma cells. Thymidine (1 mM) greatly increased the ratio of the deoxythymidine 5'-triphosphate to deoxycytidine 5'-triphosphate pools in the sensitive cells compared to LO cells and also caused larger relative increases in the pool sizes of deoxyguanosine 5'-triphosphate and deoxyadenosine 5'-triphosphate in the sensitive compared to the resistant cells. 3-Deazauridine, known to inhibit synthesis of deoxycytidine 5'-triphosphate and cytidine 5'-triphosphate in other cell lines, potentiated the cytotoxicity of thymidine for thymidine-sensitive BE melanoma and LO cells. In LO cells, 3-deazauridine (50 microM) decreased the intracellular pool of deoxycytidine 5'-triphosphate to the level obtained with 1 mM thymidine. Lower concentrations of deoxycytidine as compared to cytidine were required to protect BE and LO cells against the cytotoxicity of thymidine plus 3-deazauridine. Deoxycytidine also was more effective than was cytidine in preventing loss of cell viability after exposure to thymidine or to 3-deazauridine individually. In these human melanoma cells, ribonucleotide reductase may be a major site of action of thymidine, of 3-deazauridine, and of both drugs in combination. These results indicate that in human tumor cells the cytotoxic effect of thymidine correlates with greater perturbations of the pyrimidine deoxyribonucleoside 5'-triphosphate pools and that thymidine and 3-deazauridine, which independently reduce the intracellular levels of deoxycytidine 5'-triphosphate, act synergistically against human tumor cells." @default.
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• W2104326487 date "1984-06-01" @default.
• W2104326487 modified "2023-09-23" @default.
• W2104326487 title "Cytotoxic and biochemical effects of thymidine and 3-deazauridine on human tumor cells." @default.
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