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Gorus, F K; Hooghe-Peters, E L; Pipeleers, D G
Journal of cellular physiology, October 1984, Letnik: 121, Številka: 1Journal Article
Glucose uptake and oxidation were markedly higher in cultured than in freshly isolated neural cells, prepared from murine fetal brain cortices. The hexose transport process--measured as 3-O-methyl-D-glucose uptake--appeared comparable in both conditions, and proceeded proportionally to the extracellular sugar concentration up to 6 mM. In contrast, glucose oxidation occurred independently of the prevailing glucose concentration from 1.4 mM on. Acute or chronic exposure to insulin exerted no effect upon cellular glucose uptake or oxidation. These results suggest that glucose handling by maturing fetal cortical cells is mainly determined by the rate of cellular glucose breakdown rather than by the rate of glucose transport into the cell; the marked rise in cellular glucose metabolism during culture might result from the synthesis and/or activation of a key enzyme in glucose catabolism. Our observations also indicate that the previously described neurotrophic effects of insulin are not mediated via enhanced glucose handling.
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