GLP-1(7-37) is an intestinal insulinotropic hormone that augments glucose induced insulin secretion.

GLP-1(7-37) is an intestinal insulinotropic hormone that augments glucose induced insulin secretion[1]. An intravenous (IV) infusion of GLP-1(7-37) at 0.5, 5, or 50 pmol/min/kg during the second hour of a 2-hour 11-mmol/L hyperglycemic clamp in Sprague-Dawley rats produces a dose-related enhancement of the glucose-induced increase in plasma insulin concentration. Infusion of GLP-1(7-37) (5 pmol/min/kg IV) during a hyperglycemic clamp at two sequentially increasing concentrations of glucose, 11 and 17 mmol/L, produces incremental increases in insulin of 600 and 1,200 pM, respectively. Similarly, infusion of GLP-1(7-37) in hyperinsulinemic, hyperglycemic Zucker diabetic fatty (ZDF) rats produces a transitory increase in plasma insulin concentration and normalizes the plasma glucose concentration. Infusion of GLP-1(7-37) in rats maintains at 11 mM glucose results in a sustained approximately twofold enhancement of the plasma insulin concentration. In rats infused with GLP-1(7-37) for 5 days at 15 pmol/min/kg, there is a small increase in basal plasma insulin concentration and no effect on glucose[2].

[1]. Sarrauste de Menthiere, C. et al. Structural requirements of the N-terminal region of GLP-1-[7-37]-NH2 for receptor interaction and cAMP production. European journal of medicinal chemistry 39, 473-480, doi:10.1016/j.ejmech.2004.02.002 (2004). [2]. Hargrove DM, et al. Glucose-dependent action of glucagon-like peptide-1 (7-37) in vivo during short- or long-term administration. Metabolism. 1995 Sep;44(9):1231-7.