Synergistic effect of A23187 and a phorbol ester on amylase secretion from rabbit pancreatic acini.

The combination of the ionophore A23187 and the phorbol ester 12-O-tetradecanoyl-phorbol-13-acetate (TPA) stimulates amylase secretion from rabbit pancreatic acini up to a level equal to, or slightly higher than when carbachol is used as stimulant. Each of the two compounds alone gives only a minor stimulation. This synergistic effect of A23187 and TPA supports a role of protein kinase C in pancreatic enzyme secretion.