Enhanced 5-Fluorouracil Nucleotide Formation After Methotrexate Administration: Explanation for Drug Synergism
- 14 September 1979
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 205 (4411) , 1135-1137
- https://doi.org/10.1126/science.472732
Abstract
Exposure of L1210 leukemia cells first to 0.1 to 100 micromolar methotrexate and then to 10 micromolar 5-fluorouracil produces a synergistic effect on the number of cells killed in culture. Methotrexate dose-related increases occur in the concentrations of intracellular 5-fluorouracil ribonucleotides and 5-fluoro-2'-deoxyuridylate and in the incorporation of 5-fluorouracil into RNA. These increases are correlated with increased concentrations of intracellular phosphoribosylpyrophosphate. It is proposed that the enhanced formation of ribonucleotides of 5-fluorouracil and the subsequent incorporation of these compounds into RNA in methotrexate-treated cells may account for synergism between these agents.Keywords
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