Summary
The cell cycle phase specificity of trimetrexate (CI-898) was examined. CHO cells synchronized by mitotic selection were exposed to 50 μM trimetrexate for 2 h at various time points after release from Colcemid block. Only S phase cells were sensitive to trimetrexate when survival was measured by a cloning assay. Comparison of plateau phase and log phase cultures indicated that plateau phase CHO cells were relatively insensitive to 5 μM trimetrexate. Exponentially growing L1210 cells were continuously exposed to either 30 nM or 3 nM trimetrexate and analyzed by DNA flow cytometry. Incubation with 30 nM trimetrexate produced cell cycle arrest in late G1 or early S phase, while exposure to 3 nM trimetrexate caused only a delay in progression through S phase. In an in vivo schedule dependence study with mice bearing approximately 3×106 P388 leukemia cells, trimetrexate was most effective with frequent administration. Mice treated on the optimal schedule, every 3 h×8 on days 1, 5, and 9 after tumor implant, had life-span increases in excess of 100%.
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Hook, K.E., Nelson, J.M., Roberts, B.J. et al. Cell cycle effects of trimetrexate (CI-898). Cancer Chemother. Pharmacol. 16, 116–120 (1986). https://doi.org/10.1007/BF00256159
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DOI: https://doi.org/10.1007/BF00256159