Abstract
The effects of pituitary adenylate cyclase activating polypeptide (PACAP) and related peptides on phagocytosis of fluorescent latex beads by mouse peritoneal macrophages were examined using flow cytometry (FCM). PACAP38, PACAP27 and vasoactive intestinal peptide (VIP) enhanced phagocytosis in a dose-dependent manner. Relative potencies of related peptides at a concentration of 10−6M were PACAP38 > PACAP27 > VIP > secretin > glucagon > (peptide with NH2-terminal histidine and COOH-terminal methionine amide, in short PHM). PACAP(6-38) was as effective as PACAP38. PACAP(6-27) enhanced phagocytosis more effectively than did PACAP27. PACAP(28-38) slightly enhanced phagocytosis. The present result suggest that PACAP38 is one of the mediators that the nervous system uses to modulate the immune system.
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