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- W2178522935 abstract "Glucose exerts opposite effects upon glucagon and insulin release from the endocrine pancreas. Glucose uptake and oxidation were therefore compared in purified A- and B-cells. In purified B-cells, the intracellular concentration of glucose or 3-O-methyl-D-glucose equilibrates within 2 min with the extracellular levels, and, like in intact islets, the rate of glucose oxidation displays a sigmoidal dose-response curve for glucose. In contrast, even after 5 min of incubation, the apparent distribution space of D-glucose or 3-O-methyl-D-glucose in A-cells remains much lower than the intracellular volume. In A-cells, both the rate of 3-O-methyl-D-glucose uptake and glucose oxidation proceed proportional to the hexose concentration up to 10 mM and reach saturation at higher concentrations. Addition of insulin failed to affect 3-O-methyl-D-glucose or D-glucose uptake and glucose oxidation by purified A-cells. Glucose releases 30-fold more insulin from islets than from single B-cells, but this marked difference is not associated with differences in glucose handling. The rate of glucose oxidation is virtually identical in single and reaggregated B-cells and is not altered after addition of glucagon or somatostatin. It is concluded that the dependency of glucose-induced insulin release upon the functional coordination between islet cells is not mediated through changes in glucose metabolism." @default.
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- W2178522935 date "1983-11-19" @default.
- W2178522935 modified "2023-09-25" @default.
- W2178522935 title "Differences in glucose handling by pancreatic A- and B-cells" @default.
- W2178522935 hasPublicationYear "1983" @default.
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