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To assess direct evidence of adrenergic stimulation in pancreatic amylase secretion, effects of catecholamines on amylase release and intracellular cyclic AMP accumulation were examined with rat dispersed pancreatic acini. We first carried out control studies with CCK-8 and carbamylcholine to evaluate the usefulness of the material for the examination of amylase secretion, and examined VIP-induced cyclic AMP accumulation to assess the agonist evoked intracellular response. As a result, significant effects of CCK-8, carbamylcholine and VIP were observed, which confirmed that dispersed pancreatic acini used in this study were useful in examining exocrine pancreatic secretion. However, catecholamines failed to stimulate amylase release from pancreatic acini, although a significant increase in intracellular cyclic AMP accumulation was observed. Thus the present study strongly suggests that direct involvement of catecholamine is unlikely in pancreatic amylase secretion, in contrast to results reported previously.

An In Vitro Evaluation of Adrenergic Action on Rat Pancreatic Amylase Secretion: Lack of Stimulatory Effect.