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The impact of the GLP-1 receptor agonist lixisenatide on postprandial glucose disposition was examined in conscious dogs to identify mechanisms for its improvement of meal tolerance in humans and examine the tissue disposition of meal-derived carbohydrate. Catheterization for measurement of hepatic balance occurred ≈16 days before study. After being fasted overnight, dogs received a subcutaneous injection of 1.5 μg/kg lixisenatide or vehicle (saline, control; n = 6/group). Thirty minutes later, they received an oral meal feeding (93.4 kJ; 19% protein, 71% glucose polymers, and 10% lipid). Acetaminophen was included in the meal in four control and five lixisenatide dogs for assessment of gastric emptying. Observations continued for 510 min; absorption was incomplete in lixisenatide at that point. The plasma acetaminophen area under the curve (AUC) in lixisenatide was 65% of that in control (P &lt; 0.05). Absorption of the meal began within 15 min in control but was delayed until ≈30-45 min in lixisenatide. Lixisenatide reduced (P &lt; 0.05) the postprandial arterial glucose AUC ≈54% and insulin AUC ≈44%. Net hepatic glucose uptake did not differ significantly between groups. Nonhepatic glucose uptake tended to be reduced by lixisenatide (6,151 ± 4,321 and 10,541 ± 1,854 μmol·kg(-1)·510 min(-1) in lixisenatide and control, respectively; P = 0.09), but adjusted (for glucose and insulin concentrations) values did not differ (18.9 ± 3.8 and 19.6 ± 7.9 l·kg(-1)·pmol(-1)·l(-1), lixisenatide and control, respectively; P = 0.94). Thus, lixisenatide delays gastric emptying, allowing more efficient disposal of the carbohydrate in the feeding without increasing liver glucose disposal. Lixisenatide could prove to be a valuable adjunct in treatment of postprandial hyperglycemia in impaired glucose tolerance or type 2 diabetes.

Effect of the glucagon-like peptide-1 receptor agonist lixisenatide on postprandial hepatic glucose metabolism in the conscious dog