Plasma secretin, CCK, and pancreatic secretion in response to dietary fat in the rat

G. M. Green, S. Taguchi, J. Friestman, W. Y. Chey, R. A. Liddle

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

The role of fat in regulation of pancreatic secretion was studied in conscious rats by measuring pancreatic secretion and plasma cholecystokinin (CCK) and secretin responses to intraluminal infusion of fat, protein, or trypsin inhibitor via the duodenum. In rats with pancreatic juice continuously returned to the intestine, intraduodenal infusion of 20% emulsified fat (Liposyn), 10% casein, and 0.4% ovomucoid trypsin inhibitor (OMTI) stimulated equivalent increases of approximately threefold in pancreatic protein output. Proglumide reduced fat-stimulated pancreatic protein secretion by >90% but did not inhibit the response to OMTI. Fat significantly increased plasma CCK from basal levels of 0.5 pM to 2-3 pM, but it was a weaker stimulant of CCK secretion than casein (peak CCK levels > 10 pM) or OMTI (peak CCK levels 5-6 pM). Fat significantly stimulated secretin release (21.7 pM) compared with casein (6.8 pM), OMTI (4.4 pM), and NaCl (3.5 pM). The inhibition of fat-stimulated pancreatic secretion by proglumide indicates that the small amounts of CCK released by fat are necessary for a normal pancreatic response, suggesting that this response may be the result of potentiation between secretin and small amounts of CCK.

Original languageEnglish (US)
Pages (from-to)19/6
JournalAmerican Journal of Physiology - Gastrointestinal and Liver Physiology
Volume256
Issue number6
StatePublished - 1989

ASJC Scopus subject areas

  • Physiology
  • Hepatology
  • Gastroenterology
  • Physiology (medical)

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