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. 1983 Jun;339:339–354. doi: 10.1113/jphysiol.1983.sp014720

Kinetics of glucose transport in human erythrocytes.

J Brahm
PMCID: PMC1199165  PMID: 6887027

Abstract

The rate of unidirectional D-[14C]glucose efflux from human red blood cells was determined at self-exchange and net-efflux conditions by means of the Millipore-Swinnex filtering technique and the rapid continuous flow tube technique with which initial rates can be measured within fractions of a second. Determinations at 38, 25 and 10 degrees C of the concentration dependence of glucose self-exchange flux and net efflux showed that both self exchange and net efflux followed simple Michaelis-Menten kinetics at all temperatures. At 38 degrees C the maximal self-exchange flux and the maximal net efflux were identical (6 X 10(-10) mol/cm2.sec). The cellular glucose concentration for half-maximal flux (K1/2) was 6.7 mM for self exchange and 8.2 mM for net efflux. By lowering temperature the maximal glucose self-exchange flux progressively exceeded the maximal net efflux, and was about three times larger at 10 degrees C. K1/2 for self exchange increased to 12.6 mM at 10 degrees C, while K1/2 for net efflux decreased to 4.4 mM. At 38 degrees C the glucose permeability at self exchange at a constant extracellular glucose concentration of 40 mM showed a bell-shaped pH dependence between pH 6 and pH 9. A maximum was found at pH 7.2, whereas the apparent permeability coefficient was halved both at pH 6 and pH 9. The temperature dependence of glucose transport was determined between 47 and 0 degrees C at a cellular glucose concentration of 100 mM which ensured greater than 85% saturation of the glucose transport system within the temperature range. The Arrhenius activation energy of glucose transport was not constant. By lowering the temperature, the activation energy increased gradually for net efflux from 55 kJ/mole between 38 and 47 degrees C to 151 kJ/mole between 0 and 10 degrees C. The temperature dependence of self-exchange flux showed a more pronounced change around 10 degrees C. The Arrhenius activation energy was found to be 61 kJ/mole above and 120 kJ/mole below 10 degrees C.

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Selected References

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