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Glucose caused a sustained and dose-related increase in the fructose 2,6-bisphosphate content of isolated pancreatic islets, as well as of purified pancreatic B-cells. With isolated B-cells, the glucose saturation curve was sigmoidal and superimposable on that obtained with hepatocytes isolated from unfed rats. However, the response to glucose was notably faster in purified B-cells than in isolated hepatocytes. In contrast again with the situation prevailing in the liver, glucagon failed to decrease significantly the concentration of fructose 2,6-bisphosphate in either islets or purified B-cells. It is proposed that, in the process of glucose-stimulated insulin secretion, an early increase in fructose 2,6-bisphosphate formation may, by causing activation of 6-phosphofructo-1-kinase, allow glycolysis to keep pace with the rate of glucose phosphorylation.

biochemical journal

Effects of glucose and glucagon on the fructose 2,6-bisphosphate content of pancreatic islets and purified pancreatic B-cells. A comparison with isolated hepatocytes