Model of rapid gastrointestinal transit in dogs

Effects of muscarinic antagonists and a nitric oxide synthase inhibitor

T. Chiba, Adil Eddie Bharucha, G. M. Thomforde, L. J. Kost, S. F. Phillips

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Our aims were to establish a canine model of rapid gastrointestinal transit, and to test the effects of muscarinic receptor antagonists (atropine, pirenzepine, AF-DX116, and darifenacin), and an NOS inhibitor, L-nitro-N-arginine (L-NNA) in this model. For gastric emptying and small bowel transit, 99mTc-labelled DTPA were added to a meal of skimmed milk (236 mL) that contained 2.4 g of magnesium hydroxide. Regional colonic transit was measured by 111In-labelled beads placed in a capsule that released isotope in the proximal colon. Scintiscans were taken at regular intervals and indices of transit were calculated. Drugs were administrated intravenously. Gastric emptying, small bowel and colonic transit were rapid. Atropine and darifenacin (a selective M3 antagonist) delayed gastric emptying and colonic transit, the selective M1 and M2 muscarinic antagonists did not. The muscarinic blockers did not slow small bowel transit. L-NNA delayed small bowel and colonic transit but did not slow gastric emptying. A model suitable for the preclinical study of antidiarrhoeals was established. M3 receptors are important in the control of gastric emptying and colonic transit, and NOS inhibition slowed small bowel and colonic transit.

Original languageEnglish (US)
Pages (from-to)535-541
Number of pages7
JournalNeurogastroenterology and Motility
Volume14
Issue number5
DOIs
StatePublished - 2002

Fingerprint

Gastrointestinal Transit
Muscarinic Antagonists
Gastric Emptying
Nitric Oxide Synthase
Dogs
Atropine
Arginine
Magnesium Hydroxide
Antidiarrheals
Pirenzepine
Pentetic Acid
Muscarinic Receptors
Isotopes
Cholinergic Agents
Capsules
Meals
Canidae
Colon
Milk
Pharmaceutical Preparations

Keywords

  • L-nitro-N-arginine
  • Muscarinic receptor antagonists
  • Rapid gut transit
  • Scintigraphy

ASJC Scopus subject areas

  • Physiology
  • Gastroenterology
  • Neuroscience(all)

Cite this

Model of rapid gastrointestinal transit in dogs : Effects of muscarinic antagonists and a nitric oxide synthase inhibitor. / Chiba, T.; Bharucha, Adil Eddie; Thomforde, G. M.; Kost, L. J.; Phillips, S. F.

In: Neurogastroenterology and Motility, Vol. 14, No. 5, 2002, p. 535-541.

Research output: Contribution to journalArticle

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