The Independence of Insulin Release and Ambient Insulin In Vitro

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Abstract
The effect of insulin on its own secretion was tested in three independent experimental models using insulin concentrations that approached physiologic values. The collected secretions from glucose-stimulated islet tissue had no effect on insulin release from other islets. Perifused insulin had no effect on the release of endogenous insulin even when the assay was completely controlled for dilutional effects. Perifused insulin had no effect on the release of prelabeled insulin from glucose-stimulated islets. Similarly, proinsulin did not affect insulin release. Porcine insulin did not affect the function of porcine or canine islets. These studies strongly support the independence of glucose-stimulated insulin secretion and ambient insulin.

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