Disturbed α-Cell Function in Mice with β-Cell Specific Overexpression of Human Islet Amyloid Polypeptide

Abstract EN

Exogenous administration of islet amyloid polypeptide (IAPP) has been shown to inhibit both insulin and glucagon secretion.

This study examined α-cell function in mice with β-cell specific overexpression of human IAPP (hIAPP) after an oral protein gavage (75 mg whey protein/mouse).

Baseline glucagon levels were higher in transgenic mice (41±4.0 pg/mL, n=6) than in wildtype animals (19±5.1 pg/mL, n=5, P=.015).

In contrast, the glucagon response to protein was impaired in transgenic animals (21±2.7 pg/mL in transgenic mice versus 38±5.7 pg/mL in wildtype mice at 15 minutes; P=.027).

Baseline insulin levels did not differ between the groups, while the insulin response, as the glucagon response, was impaired after protein challenge (P=.018).

Glucose levels were not different between the groups and did not change significantly after protein gavage.

Acetaminophen was given through gavage to the animals (2 mg/mouse) to estimate gastric emptying.

The plasma acetaminophen profile was similar in the two groups of mice.

We conclude that disturbances in glucagon secretion exist in mice with β-cell specific overexpression of human IAPP, which are not secondary to changes in gastric emptying.

The reduced glucagon response to protein challenge may reflect a direct inhibitory influence of hIAPP on glucagon secretion.