New insights into pancreatic beta-cell metabolic signaling in insulin secretion

Department of Nutrition, University of Montreal, Canada.

In recent years, it has become apparent that second messengers and factors other than ATP. metabolically sensitive K+ATP channels and Ca2+ play essential roles in nutrient-induced insulin release. This paper reviews the evidence in support of several new concepts and hypotheses in the field of beta-cell signaling. These include in particular that: a rise in cytosolic Ca2+ is not sufficient to explain the kinetics and extent of secretion induced by glucose; variations in ADP, rather than ATP, regulate beta-cell metabolism and the K+ATP channel; anaplerosis (the replenishment of the citric acid cycle with intermediates) is essential for beta-cell activation: a shift from fatty acid oxidation to esterification is an important event in beta-cell signaling: malonyl-CoA and long chain acyl-CoA esters may act as metabolic coupling factors; glycolytic oscillations underlie, in part, oscillations in electrical activity, cytosolic Ca2+ and insulin release. A metabolic model of fuel sensing that integrates the mode of action of all classes of nutrient secretagogues is proposed.

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