Abstract
An oral glucose tolerance test (OGTT), an OGTT after infusion of anti-gastric inhibitory polypeptide (GIP) serum, and an intravenous glucose infusion were performed in unrestrained and unanesthetized rats. In the rats treated with anti-GIP serum the insulin release was significantly depressed. This finding supports the concept that GIP is a physiologically important ‘glucose-dependent insulin-releasing peptide’.