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Endocrinology, Vol 117, 824-833, Copyright © 1985 by Endocrine Society

ARTICLES

Interplay of nutrients and hormones in the regulation of insulin release

DG Pipeleers, FC Schuit, PA in't Veld, E Maes, EL Hooghe-Peters, M Van de Winkel and W Gepts

Single pancreatic B cells are purified by autofluorescence-activated cell sorting, and their secretory activity is measured after overnight culture. Compared to intact islets, the isolated cells release 2-fold more insulin under basal conditions and 5-fold less during nutrient stimulation. Their secretory activity can be induced by glucose, leucine, or arginine, but only 0.3-1.7% of their hormone content is liberated at 20 mM nutrient concentrations. This poor nutrient-induced insulin release from purified B cells is attributed to their low cAMP levels and is markedly increased after addition of (Bu)2cAMP, of glucagon, or of pancreatic A cells. These results strongly support the concept that the potent in vivo insulin-releasing action of glucose and leucine is not only dependent on their fuel capacity in pancreatic B cells but also on the concurrent cAMP levels in these cells. In isolated islets, endogenously released glucagon apparently determines the cAMP production in B cells and thus participates in the nutrient- induced secretory process. Somatostatin and epinephrine were shown to exert their suppressive effects via the glucagon-dependent messenger system. It is concluded that nutrients and hormones interact with two different messenger systems which amplify each others' stimulatory effect upon insulin release. cAMP might represent the hormone-induced messenger which sets the B cell's sensitivity and secretory capacity for nutrient stimuli such as glucose. The higher insulin secretory response observed after reaggregation of single B cells could not be attributed to an altered activity in the nutrient or hormonal regulatory units, raising the possibility that the aggregated state of the cells is rather responsible for a better organization or cooperation of the secretory effector unit.


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