Histamine release induced by human natriuretic peptide from rat peritoneal mast cells

We have been interested in the effects of some popular peptides on tracheal smooth muscle. Previously, we reported that atrial natriuretic peptide (ANP), brain natriuretic peptide (BNP) and C-type natriuretic peptide (CNP) had dose-dependent relaxant effects on guinea pig tracheal smooth muscle. In this study, we compared the effects of ANP, BNP and CNP on histamine release from rat peritoneal mast cells. ANP and BNP were more potent than CNP, dose-dependently increasing histamine release at a concentration of 10(-7) M or higher. CNP induced histamine release at a concentration of 10(-6) M or higher. Extracellular calcium inhibited the histamine release induced by all 3 peptides. In conclusion, the effects of these 3 peptides in rat peritoneal mast cells demonstrated adverse reactions for respiratory diseases, although our previous results showed that these peptides caused relaxation of guinea pig tracheal smooth muscle. We should note that the drugs have different actions in each organ.