Alternative titles and symbols : Insulinotropic polypeptide receptor, glucose-dependent;
Description : Gastric inhibitory polypeptide (GIP; 137240), also called glucose-dependent insulinotropic
polypeptide, is a 42-amino acid polypeptide synthesized by K cells of the duodenum
and small intestine. It was originally identified as an activity in gut extracts that
inhibited gastric acid secretion and gastrin release, but subsequently was demonstrated
to stimulate insulin release potently in the presence of elevated glucose. The insulinotropic
effect on pancreatic islet beta-cells was then recognized to be the principal physiologic
action of GIP. Together with glucagon-like peptide-1, GIP is largely responsible for
the secretion of insulin after eating. It is involved in several other facets of the
anabolic response (summary by Usdin et al., 1993).;