Physiologic Release of Secretin Measured in Peripheral and Portal Venous Blood of Dogs

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Abstract
The effect of food on circulating levels of secretin, measured by radioimmunoassay, was studied in 7 dogs. Significant postprandial increases in secretin were found in portal and peripheral plasma of dogs fasted for 18h. Basal levels of secretin were significantly lower in dogs fasted for 72 h when compared with dogs after an 18-hour fast. After the prolonged fast, food caused a significant release of secretin, measured peripherally. We conclude that secretin is released by a physiologic stimulus (food) and that circulating levels of secretin are depressed after prolonged starvation.

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