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The present study was designed to determine the effects of physiological increments of plasma glucose levels upon basal and stimulated plasma somatostatin and pancreatic polypeptide levels. In seven conscious dogs the elevation of plasma glucose levels by 30-40 mg/dl did not change basal somatostatin and pancreatic polypeptide levels. During stimulation of these two hormones by acetylcholine and the octapeptide of cholecystokinin intravenous infusion of glucose elicited a significant decrease of somatostatin levels by 30 pg/ml and of pancreatic polypeptide levels by 300 pg/ml. The present data demonstrate that a physiological elevation of plasma glucose levels inhibits stimulated but not basal somatostatin and pancreatic polypeptide levels which may be of importance for nutrient entry and metabolism.
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