Abstract
We investigated a possible role of endogenous cholecystokinin-pancreozymin (CCK-PZ) in the mechanism of exocrine pancreatic secretion after excluding pancreatic juice from the intestine in rats. Fasting plasma immunoreactive CCK-PZ was determined in normal rats, in rats with pancreatic duct ligation, and in sham-operated rats. The mean fasting plasma CCK-PZ concentration of rats with pancreatic duct ligation, 25.1 +/- 2.0 pM, was significantly greater (p less than 0.001) than those of normal and sham-operated rats, 14.3 +/- 1.7 and 11.5 +/- 2.2 pM, respectively. Whereas mean postprandial plasma CCK-PZ concentrations of normal and sham-operated rats were significantly greater (p less than 0.001) than their fasting levels, no significant increase occurred in the rats with pancreatic duct ligation after a meal. The mean fasting plasma CCK-PZ concentration of rats with pancreatic duct ligation was comparable to the mean postprandial CCK-PZ level of normal and sham-operated rats. To determine a possible role of circulating endogenous CCK-PZ on the pancreatic secretion, anesthetized rats were prepared with ligation of pylorus and cannulation of pancreatic duct. After diversion of pancreatic juice began, pancreatic secretion including...Continue Reading
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