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• W1573930536 abstract "Incubation of chick embryo fibroblasts in glucose-free medium resulted in a dramatic increase in the rate of 2-deoxy-D-glucose transport. The greatest increase in rate occurred during the first 20 hours of incubation in glucose-free medium and was blocked by actinomycin D, dordycepin, or cycloheximide. The conditions of 2-deoxy-D-glucose concentration and time of incubation with the sugar were determined where transport rather than phosphorylation was rate-limiting in sugar uptake. These studies demonstrated that the transport of 2-deoxy-D-glucose was rate-limiting for only 1 or 2 min when the concentration of sugar in the medium was near the Km for transport, i.e. 2mM. No difference was found in the level of hexokinase activity in homogenates prepared from cells incubated glucose-free medium or standard medium when either 2-deoxy-D-[14C]glucose or D-glucose was used as substrate. A kinetic analysis of the initial rates of 2-deoxy-D-glucose transport by Lineweaver-Burk plots showed that the Vmax for sugar transport increased from 18 to 95 nmol per mg of protein per min when fibroblasts were incubated in glucose-free medium for 40 hours. The Km remained constant at 2 mM. Analysis of the initial rates of 3-omicron-methyl-D-glucose transport by Lineweaver-Burk plots further substantiated that the increase in sugar transport was due to an increase in the Vmax for transport with the Km remaining constant. The activation energy for the transport reaction calculated from an Arrhenius plot was 17.4 Cal per mol for cells cultured in the standard medium and 17.2 Cal per mol for cells cultured in the glucose-free medium. These results are consistent with the interpretation that the Vmax increase observed in hexose-starved cells is due to an increase in the number of transport sites." @default.
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• W1573930536 date "1975-01-01" @default.
• W1573930536 modified "2023-10-16" @default.
• W1573930536 title "Induction of sugar transport in chick embryo fibroblasts by hexose starvation. Evidence for transcriptional regulation of transport" @default.
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• W1573930536 doi "https://doi.org/10.1016/s0021-9258(19)41938-8" @default.
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