DA 4626 is H2-receptor antagonism. The compound which was investigated in a wider concentration range, behaved as simple competitive antagonists, yielding apparent KB values comparable with those estimated in conventional H2-receptor assays.
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),