Abstract
Intravenous infusions of glucagon-like peptide-1(7-36) amide (GLP-1; 35 pmol min-1 kg-1 for 10 min) produced a significant rise in mean heart rate, without significant change in mean aortic blood pressure, together with a significant rise in mean arterial plasma insulin, but not in plasma pancreatic glucagon or pancreatic polypeptide concentration, in conscious calves given exogenous glucose (30-60 micromol min-1 kg-1 i.v.). The insulinotropic effect was eliminated in the presence of exogenous amino acids (0.03 mmol min-1 kg-1 i.v.). It was not affected predictably by blocking the synthesis of nitric oxide or by the simultaneous administration of the established incretin factor gastrin-releasing peptide (GRP). Whereas GLP-1 produced a statistically significant rise in plasma insulin concentration in these animals, it was much less effective than GRP in this respect, when given by continuous i.v. infusion.
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