The ileum and carbohydrate-mediated feedback regulation of postprandial pancreaticobiliary secretion in normal humans

N. K. Jain, M. Boivin, A. R. Zinsmeister, E. P. DiMagno

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We investigated the effect of perfusing carbohydrate into the ileum on postprandial pancreaticobiliary secretion and the relationships among carbohydrate in the ileum, pancreaticobiliary secretion, and gastric emptying. Eighteen healthy volunteers were intubated with a multilumen oroileal tube. A metal labeled with 111In-diethylenetriamine-pentaacetic acid (400 calories; 60% carbohydrate, 20% protein, 20% fat) was then infused into the stomach, and a carbohydrate solution (rice starch + glucose) was perfused into the terminal ileum at rates (mg/min) of 0 (saline; n = 6), 12.5 (n = 4), 25 (n = 4), 50 (n = 2), and 100 (n = 2). To prevent digestion of the carbohydrate in the ileum, an amylase inhibitor (3.3 mg/ml) was added to the perfusate used in half of the subjects. Postprandially, we measured outputs of amylase, trypsin, and bile acids in the duodenum, the amount of carbohydrate in the ileum, and gastric emptying. During the second postprandial hour the rate of gastric emptying was inversely related to the amount of carbohydrate in the ileum (p < 0.01) and was directly correlated with pancreaticobiliary secretion (p < 0.05). However, as the amount of unabsorbed carbohydrate in the ileum increased, the ratio of amylase to trypsin secretion increased (p < 0.005). Postprandially carbohydrate in the ileum induces changes of upper-gut function that should increase digestion and absorption of carbohydrate since gastric emptying (and delivery of carbohydrate to the duodenum) slows and pancreatic amylase secretion increases relative to trypsin secretion and gastric emptying.

Original languageEnglish (US)
Pages (from-to)495-505
Number of pages11
JournalPancreas
Volume6
Issue number5
StatePublished - 1991

Fingerprint

Ileum
Carbohydrates
Gastric Emptying
Amylases
Trypsin
Duodenum
Digestion
Pentetic Acid
Bile Acids and Salts
Starch
Stomach
Healthy Volunteers
Metals
Fats
Glucose

Keywords

  • Amylase
  • Amylase inhibitor
  • Bile acids
  • Starch
  • Trypsin

ASJC Scopus subject areas

  • Endocrinology
  • Gastroenterology

Cite this

Jain, N. K., Boivin, M., Zinsmeister, A. R., & DiMagno, E. P. (1991). The ileum and carbohydrate-mediated feedback regulation of postprandial pancreaticobiliary secretion in normal humans. Pancreas, 6(5), 495-505.

The ileum and carbohydrate-mediated feedback regulation of postprandial pancreaticobiliary secretion in normal humans. / Jain, N. K.; Boivin, M.; Zinsmeister, A. R.; DiMagno, E. P.

In: Pancreas, Vol. 6, No. 5, 1991, p. 495-505.

Research output: Contribution to journalArticle

Jain, NK, Boivin, M, Zinsmeister, AR & DiMagno, EP 1991, 'The ileum and carbohydrate-mediated feedback regulation of postprandial pancreaticobiliary secretion in normal humans', Pancreas, vol. 6, no. 5, pp. 495-505.
Jain, N. K. ; Boivin, M. ; Zinsmeister, A. R. ; DiMagno, E. P. / The ileum and carbohydrate-mediated feedback regulation of postprandial pancreaticobiliary secretion in normal humans. In: Pancreas. 1991 ; Vol. 6, No. 5. pp. 495-505.
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