Abstract
On aerobic incubation of rat cerebral cortex slices with anomers ofd-glucose and with 2-deoxy-d-glucose (2DG) for 5 min, the disappearance of β-d-glucose from the incubation mixture was greater than that of α-d-glucose and both anomers had a greater rate of disappearance than that of 2DG. In addition, there were significantly greater consumption of oxygen and production of lactate with the β-anomer than with the α-anomer. In similar experiments with3H-labeledd-glucose anomers and [1-3H]-3-O-methyl-d-glucose (3MG), the accumulation of [1-3H]-β-d-glucose (up to 5 min) by rat cerebral cortex slices was greater than that of [1-3H]-α-d-glucose. Although initially lower than that of the anomers, the accumulation of [1-3H]-3MG increased at a greater rate and, by 5 min of incubation, was greater than that of both glucose anomers. This preferential accumulation was seen to disappear when the slices were preincubated with 2DG (hexokinase inhibitor) or when the temperature of incubation was reduced to 20°C. Under those conditions the data with the glucose anomers were similar to those obtained with 3MG. Our data then suggested that the greater accumulation of β-d-glucose than of α-d-glucose by the slices was probably not due to differences in transport through brain cell membranes but rather to the preferential metabolism of the β-d-glucose.
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Nagata, Y., Nanba, T., Ando, M. et al. Anomeric preferences ofd-glucose uptake and utilization by cerebral cortex slices of rats. Neurochem Res 4, 505–516 (1979). https://doi.org/10.1007/BF00964644
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DOI: https://doi.org/10.1007/BF00964644