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PACAP (1-38) free acid is an endogenous neuropeptide. PACAP (1-38) free acid potently stimulates antral motility and somatostatin secretion, inhibits the secretion of gastrin and stimulates the release of vasoactive intestinal polypeptide, gastrin releasing peptide and substance P. PACAP (1-38) free acid also enhances N-methyl-D-aspartate receptor function and expression of brain-derived neurotrophic factor through RACK1[1][2].

[1] Torn?e K, et al. PACAP 1-38 as neurotransmitter in the porcine antrum. Regul Pept. 2001 Sep 15;101(1-3):109-21. DOI:10.1016/s0167-0115(01)00276-2
[2] Yaka R, et al. Pituitary adenylate cyclase-activating polypeptide (PACAP(1-38)) enhances N-methyl-D-aspartate receptor function and brain-derived neurotrophic factor expression via RACK1. J Biol Chem. 2003 Mar 14;278(11):9630-8. DOI:10.1074/jbc.M209141200