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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.

experimental diabetes research

Disturbed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math>-Cell Function in Mice with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-Cell Specific Overexpression of Human Islet Amyloid Polypeptide

Disturbedα-Cell Function in Mice withβ-Cell Specific Overexpression of Human Islet Amyloid Polypeptide