Glucose-dependent Insulinotropic Polypeptide (GIP) (1-42) is an endogenous 42-amino acid peptide incretin hormone that induces insulin secretion.1,2 It is expressed in intestinal neuroendocrine K cells and the submandibular gland and is released into circulation postprandially. GIP (1-42) inhibits histamine, pentagastrin, and insulin-induced gastric acid and pepsin secretion, increases glucose-induced insulin release, and stimulates gastric emptying in rats.3
References:
[1]. Fehmann, H.-C., and G?ke, B.Characterization of GIP(1-30) and GIP(1-42) as stimulators of proinsulin gene transcriptionPeptides16(6)1149-1152(1995).
[2]. Siskos, A.P., Katsila, T., Balafas, E., et al.Simultaneous absolute quantification of the glucose-dependent insulinotropic polypeptides GIP1-42 and GIP3-42 in mouse plasma by LC/ESI-MS/MS: Preclinical evaluation of DP-IV inhibitorsJ. Proteome Res.8(7)3487-3496(2009).
[3]. Rossowski, W.J., Zacharia, S., Mungan, Z., et al.Reduced gastric acid inhibitory effect of a pGIP(1-30)NH2 fragment with potent pancreatic amylase inhibitory activityRegul. Pept.39(1)9-17(1992).
















