Abstract
Gastric inhibitory polypeptide (GIP) release into the portal vein in response to duodenal instillation of glucose in doses of 0.695, 1.39, 2.78 and 5.56 mmol/kg body weight was studied in an acute condition in male Wistar rats. A rapid, dose-dependent, and significant rise in portal vein plasma GIP was found in response to increasing duodenal glucose loads, which could be described by Michaelis-Menten kinetics. It is suggested that the glucose-induced GIP release into the portal vein mainly is effected first after glucose has gained access inside the mucosal cells.
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