Abstract
THE rate of release of insulin by pancreatic islets is increased by glucose with a Km (for glucose) of approximately 10 mM (refs. 1 and 2). The rate of oxidation of glucose by mouse pancreatic islets is similarly dependent on glucose concentration and the Km (for glucose) is approximately 7 mM (ref. 3). Studies with mannoheptulose and phloridzin and measurements of islet glucose-6-phosphate concentration have indicated that glucose metabolism in pancreatic islets may be controlled by the rate of conversion of glucose to glucose-6-phosphate3,4. Glucose-6-phosphatase activity has been detected in rabbit islets5 and in the islets of obese-hyperglycaemic mice6, and we have previously noted activity in normal mouse islets in a study of hexokinase activity7. We have now investigated the possible role of glucose-6-phosphatase in the control of glucose phosphorylation in islets isolated from normal mouse pancreas by the collagenase method3.
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References
Coore, H. G., and Randle, P. J., Biochem. J., 93, 66 (1964).
Malaisse, W., Malaisse-Lagae, F., and Wright, P. H., Endocrinology, 80, 99 (1967).
Ashcroft, S. J. H., and Randle, P. J., Lancet, i, 278 (1968).
Montague, W., and Taylor, K. W., Nature, 217, 853 (1968).
Lazarus, S. S., and Barden, H., Diabetes, 14, 146 (1965).
Taljedal, I.-B., Biochim. Biophys. Acta, 146, 292 (1967).
Ashcroft, S. J. H., and Randle, P. J., Biochem. J., 107, 599 (1968).
Ockerman, P. A., Clin. Chim. Acta, 17, 201 (1967).
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ASHCROFT, S., RANDLE, P. Glucose-6-phosphatase Activity of Mouse Pancreatic Islets. Nature 219, 857–858 (1968). https://doi.org/10.1038/219857a0
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DOI: https://doi.org/10.1038/219857a0
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