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3-O-Methyl-D-glucose transport across the plasma membrane of isolated rat hepatocytes was followed for net entry of the sugar into sugar-free cells (zero trans entry), net exit of sugar into sugar-free medium (zero trans exit) and for unidirectional entry and exit fluxes when cells had been equilibrated with sugar in the extracellular medium (equilibrium exchange entry and exit). These measurements were performed at 20 degrees C and pH 7.4 by the use of simple manual methods. Initial rates of transport showed a Michaelis--Menten dependency on the sugar concentration at the cis side of the membrane over the range of concentrations tested (100 microM to 100 mM). Transport was found to be symmetrical with no evidence of substrate stimulation of transport from the trans side of the membrane. Parameters (mean values +/- S.E.M.) of transport were estimated as Vmax. 86.2 +/- 9.7 mmol/litre of cell water per min and Km 18.1 +/- 5.9 mM for exchange entry, Vmax. 78.8 +/- 5.3 mmol/litre of cell water per min and Km 17.6 +/- 3.5 mM for exchange exit, Vmax. 84.1 +/- 8.4 mmol/litre of cell water per min and Km 16.8 +/- 4.6 mM for zero trans exit.

Kinetics of 3-O-methyl-D-glucose transport in isolated rat hepatocytes