This study was conducted in rats to investigate the influence of exogenously administered estradiol (ESD) and/or cholecystokinin (CCK) on components and secretions of the pancreatic acini. Intact male rats were treated for 14 d with exogenous administration of ESD, CCK, or ESD+CCK. After 14 d CCK treatment induced significant increases in DNA and RNA contents, and DNA/RNA ratio in the pancreas, indicating hyperplasia and hypertrophy of the pancreas, however, ESD treatment did not have these effects. Both ESD treatment and CCK treatment induced significant increases in amylase and trypsinogen contents in pancreatic acini and each decreased secretion from acini in response to CCK. Combined treatment with ESD plus CCK augmented these effects on enzyme contents and secretion. The results indicate that exogenous administration of CCK has trophic effects on the exocrine pancreas, increasing effects on enzyme contents and inhibitory effects on amylase secretion. In contrast, exogenous administration of ESD had no trophic effects on pancreas, but had increasing effects on enzyme contents and inhibitory effects on amylase secretion. The results suggest that the effects of exogenous ESD and CCK on pancreas are not similar to each other, but both ESD and CCK may be involved in regulating pancreatic exocrine functions.
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