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Transport and accumulation of 2-deoxy-D-glucose in wild-type and hexokinase-deficient cultured Chinese-hamster ovary (CHO) cells.

Hexokinase-deficient mutants and wild-type Chinese-hamster ovary cells have been used to investigate the role of hexokinase in uptake and accumulation of 2-D-deoxyglucose (2-dGlc). The evidence for a specific sugar transport system in both types of cells is that there is similar saturable phloretin-sensitive uptake of 2-dGlc and 3-O-methyl-D-glucose (3-OMG) in both types of cell. In wild-type cells, 2-dGlc is accumulated to a tissue:medium ratio of 10- and in the mutant only 3-fold; 3-OMG is not accumulated by either mutant or wild-type cells. The evidence that hexokinase affects the membrane transport process is that the rate of exit of free 2-dGlc from wild-type cells is 5-fold less than from mutant cells, whereas there is no difference in the rate of loss of 3-OMG between mutant and wild-type cells.