Dose-Response Study of Somatostatin on Meal-Stimulated Levels of Pancreatic Polypeptide and Insulin in the Dog

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Abstract
A dose-response study of the effect of 0.1-5.0 .mu.g kg-1 h-1 somatostatin was performed on food-induced rise of pancreatic polypeptide [PP] and insulin in 4 dogs. There was a dose-dependent suppression of the release of PP and insulin with an ED50 of .apprx. 0.65 and 0.8 .mu.g kg-1 h-1, respectively, during the first 45-min period. In the second 45-min period, high doses of somatostatin failed to suppress insulin concentrations whereas, the serum concentrations of PP were reduced by a similar degree as in the first 45 min. The differing effects of somatostatin on food-stimulated serum concentrations of insulin and PP indicate that somatostatin does not represent a uniform suppressor of pancreatic hormones.