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- W1551162209 abstract "During treatment of HL-60 myeloid leukemia cells in culture with polar solvents or retinoic acid at a concentration inducing terminal maturation in 90-95% of the cells, there is a rapid decline (within 2 h) in the Vmax for influx of the folate analogue, [3H]methotrexate. Following 24 h of exposure to these agents, there is no effect on growth, but influx Vmax is reduced by 70%. After 7 days of exposure, influx Vmax is reduced 90-95%. A similar time course was seen for the reduction in intracellular levels of dihydrofolate reductase, a marker of cellular proliferation. Both the extent of terminal maturation (as determined by the extent of nitro blue tetrazolium reduction) and decrease in influx showed the same dependence on the concentration of inducer. In contrast to the effect seen on influx Vmax, both influx Km and mediated efflux of [3H]methotrexate remained unchanged in HL-60 cells exposed to inducers of maturation. Finally, evidence is presented for the coupling of this alteration on [3H]methotrexate influx with commitment of HL-60 cells to terminal maturation. This evidence shows that the effect on folate analogue influx precedes commitment and documents the irreversible nature of the reduction in influx once the majority of the cells exposed to inducer were committed to the process of maturation. The possible relevance of these results to the process of neoplastic transformation is discussed." @default.
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- W1551162209 date "1986-08-01" @default.
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- W1551162209 title "Alteration of folate analogue transport following induced maturation of HL-60 leukemia cells. Early decline in mediated influx, relationship to commitment, and functional dissociation of entry and exit routes." @default.
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- W1551162209 doi "https://doi.org/10.1016/s0021-9258(18)67361-2" @default.
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