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Pituitary adenylate cyclase-activating peptide (PACAP) (1-27) is a PACAP receptor agonist with IC50 values of 3, 2, and 5 nM, respectively, for rat PAC1, rat VPAC1, and human VPAC2 recombinant receptors expressed in CHO cells. It binds to PACAP receptors in rat brain membrane (IC50 = 9.55 nM) and to SH-SY5Y and SK-N-MC human neuroblastoma and T47D human breast cancer cells (IC50s = 1.1, 1.9, and 0.9 nM, respectively). PACAP (1-27) stimulates cAMP accumulation in H-SY5Y, SK-N-MC, and T47D cells (EC50s = 0.19, 0.22, and 0.17 nM, respectively). In vivo, in newborn pigs, PACAP (1-27) (1 μM) induces vasodilation of pial arterioles by 36%.

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