Abstract
The effect of the phorbol ester 12- O-tetradeconyl-phorbol-13-acetate (TPA) on noradrenaline (NA) and acetylcholine (ACh)-evoked amylase secretion in isolated segments of rat pancreas was investigated. TPA alone evoked a relatively small increase in amylase output. However, when combined with either noradrenaline or ACh, the phorbol ester markedly enhanced the secretagogue-induced amylase secretion. These effects were dose related. TPA also enhanced the amylase secretion evoked by either the Ca 2+ ionophore A23187 or dibutyryl cyclic AMP. This potentiation by TPA of noradrenaline, ACh, Ca 2+ ionophore A23187 and dibutyryl cyclic AMP-evoked amylase output may suggest the existence of a third pathway controlling enzyme secretion in the pancreas.
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