Effects of Subchronic Treatment With the Long-Acting Glucose-Dependent Insulinotropic Polypeptide Receptor Agonist, N-AcGIP, on Glucose Homeostasis in Streptozotocin-Induced Diabetes
Gault, Victor A.
McClean, Paula L.
Power, Gavin J.
McCluskey, Jane T.
Flatt, Peter R.
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Gault, V., McClean, P., Irwin, N., Power, G., McCluskey, J. & Flatt, P. (2007) Effects of Subchronic Treatment With the Long-Acting Glucose-Dependent Insulinotropic Polypeptide Receptor Agonist, N-AcGIP, on Glucose Homeostasis in Streptozotocin-Induced Diabetes, Pancreas, vol. 35, , pp. 73-79,
OBJECTIVES: N-AcGIP is a potent and dipeptidylpeptidase IV-resistant analogue of glucose-dependent insulinotropic polypeptide with significantly improved antidiabetic actions in type 2 diabetes. The present study investigated the effects of subchronic treatment with N-AcGIP on glucose homeostasis in a type 1 model, namely, streptozotocin (STZ)-induced diabetic mice. METHODS: Swiss TO mice given a single intraperitoneal injection of STZ (150 mg/kg body weight) received once-daily injection of N-AcGIP (25 nmol/kg body weight) or saline for 20 days and effects on metabolic parameters and islet architecture assessed. RESULTS: Daily injection of N-AcGIP for 20 days did not significantly alter the characteristic STZ-induced changes of pancreatic insulin content, body weight, food intake, glucose, and glycated hemoglobin levels. Glucose tolerance and insulin sensitivity were also unchanged by N-AcGIP treatment. Circulating insulin was undetectable, and the number of intact islets and insulin expression was greatly reduced in both groups. Some proliferative activity was identified by 5-bromo-2-deoxyuridine staining in the pancreas, but this and expression of glucagon and somatostatin were similar in the 2 groups. CONCLUSIONS: These data indicate that subchronic treatment with the long-acting glucose-dependent insulinotropic polypeptide receptor agonist, N-AcGIP, does not have beneficial effects in insulin-deficient STZ-diabetic mice. This supports the primary antidiabetic action of this analogue in type 2 diabetes as stimulation of beta-cell function and insulin secretion.