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Glucagon-like peptide-1 (GLP-1), an insulinotropic gastrointestinal peptide that is primarily produced by intestinal endocrine L-cells, stimulates satiety. Ghrelin, a hormone that is produced predominantly by the stomach stimulates hunger. There are two forms of ghrelin: active ghrelin and inactive des-acyl ghrelin. After depriving mice of food for 24 h, we demonstrated that the systemic administration of liraglutide (100   μ  g/kg), a human GLP-1 analog that binds to the GLP-1 receptor, increased (1.4-fold) the plasma levels of active GLP-1 and suppressed the plasma levels of active and des-acyl ghrelin after 1 h. Despite the elevated plasma levels of active GLP-1 (11-fold), liraglutide had no effect on the plasma levels of active or des-acyl ghrelin after 12 h. These findings demonstrated that liraglutide suppresses the plasma levels of active and des-acyl ghrelin independently of active GLP-1 levels in fasted mice, suggesting a novel  in vivo  biological effect of liraglutide beyond regulating plasma GLP-1.

Liraglutide Suppresses the Plasma Levels of Active and Des-Acyl Ghrelin Independently of Active Glucagon-Like Peptide-1 Levels in Mice