Glucose-Stimulated 45Calcium Efflux from Isolated Rat Pancreatic Islets

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Glucose-stimulated 45Calcium efflux from isolated rat pancreatic islets.

Kinetics of (45)Ca efflux and insulin release were studied in collagenase-isolated rat islets during 2-h perifusions with calcium-depleted (0.05 mM) bicarbonate-phosphate buffer containing 2.2 mM glucose. Addition of glucose (16.7 mM) suppressed (45)Ca efflux by 30%. Removal of glucose caused an "off response" of insulin release. The perifusion of a normal concentration of Ca (2.3 mM) greatly s...

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Oscillations in cytosolic free Ca2+, oxygen consumption, and insulin secretion in glucose-stimulated rat pancreatic islets.

Insulin secretion in the intact organism, and by the perfused pancreas and groups of isolated perifused islets, is pulsatile. We have proposed a metabolic model of glucose-induced insulin secretion in which oscillations in the ATP/ADP ratio drive alterations in metabolic and electrical events that lead to insulin release. A key prediction of our model is that metabolically driven Ca2+ oscillati...

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ژورنال

عنوان ژورنال: Journal of Clinical Investigation

سال: 1978

ISSN: 0021-9738

DOI: 10.1172/jci109156