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Pituitary adenylate cyclase-activating polypeptide (PACAP) is present in gastric mucosa, but its direct effect on parietal cells is unknown. We examined this using 14C-aminopyrine uptake in elutriated rabbit cells. PACAP-27 had no effect on basal cells but significantly increased the response to histamine (10(-4) M) at 10(-9) M and to carbachol (10(-4) M) in the presence of ranitidine (10(-4) M) at 10(-7) M and 10(-8) M. PACAP (6-38), an antagonist of PACAP, inhibited the effect of PACAP-27 on carbachol-stimulated cells. Vasoactive intestinal peptide had no significant effect. In conclusion, PACAP-27 has a direct additive effect on stimulated rabbit parietal cells in vitro.
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