Potent, selective peptide agonist for the neuropeptide Y Y5 receptor (IC50 values for inhibition of NPY binding to human Y5, Y1, Y2 and Y4 receptors are 0.24, 530, > 500, and 51 nM respectively, Ki at Y5 = 0.1 - 0.15 nM). Stimulates food intake in vivo.
Pancreatic Polypeptide, rat, is an agonist of the NPY receptor with high affinity at NPYR4. Pancreatic polypeptide (PP) is a 36-amino acid, C-terminally amidated peptide, and a member of the PP-fold peptide family, produced and secreted by the PP cells.
Endogenous high affinity agonist for human NPY Y4 receptor (Ki = 0.056 nM). Believed to play an important role in the function of the gastrointestinal tract.
PACAP (1-38), a novel neuropeptide isolated from the bovine hypothalamus is more active than vasoactive intestinal peptide (VIP) in stimulating adenylate cyclase (EC50=7 nM). PACAP 1-38 (10-9 M) increased substance P (SP), gastrin releasing peptide (GRP),
This GIP fragment has potent insulinotropic activity in the isolated, perfused rat pancreas but greatly reduced somatostatinotropic activity in the isolated perfused rat stomach. The site responsible for insulinotropic activity apparently lies between residues 19 and 30 of GIP.