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Diabetes, Vol 25, Issue 4 256-259, Copyright © 1976 by American Diabetes Association

ARTICLES

Cyclic nucleotides in pancreatic islets. Tolbutamide- and arginine-induced insulin release

MA Charles, J Lawecki, AL Steiner and GM Grodsky

With the use of isolated rat islet perfusion, levels of the islet cyclic adenosine 3' ,5' -monophosphate (cAMP) were compared with dynamic insulin secretion induced by tolbutamide and arginine. Tolbutamide elevated islet cAMP rapidly and augmented both glucose-induced islet cAMP levels and insulin secretion; arginine, however, did not elevate islet cAMP but did enhance glucose-induced insulin secretion. Since the latter result could have been modulated by cyclic guanosine 3' ,5' -monophosphate, this cyclic nucleotide was also measured and found to remain unchanged during stimulation of insulin secretion by arginine and a combination or arginine and glucose. Thus, the action of tolbutamide appears to be modulated in part by cAMP, whereas arginine appears to augment insulin secretion independently of cyclic nucleotides.
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Copyright © 1976 by the American Diabetes Association.