Effect of short-chain fatty acids on contractile activity and fluid flow in rat colon in vitro

Squires, Paul E. and Rumsey, R .D. E. and Edwards, C. A. and Read, N. W. (1992) Effect of short-chain fatty acids on contractile activity and fluid flow in rat colon in vitro. American Journal of Physiology - Gastrointestinal and Liver Physiology, 262 (5 25-5). G813-G817. ISSN 0002-9513

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Item Type:Article
Item Status:Live Archive

Abstract

The effect of short-chain fatty acids (SCFAs) on the contractile activity and fluid output of the large bowel of the rat was studied using an isolated segment of cecum and colon, mounted in vitro. The rate of contractile activity per minute in the proximal, mid, and distal regions of the colon was depressed by luminal infusion of associated SCFAs either as a mixture (acetic, propionic, and butyric) or individually (100 mM/pH = 4.1, in each case). Dose responses were observed for the individual fatty acids, with the 100 mM solutions eliciting a more prominent reduction in colonic motor activity than that induced by 10 mM. Neither the Na salt of the fatty acids nor an acidified Krebs solution (pH = 4.1) inhibited contractile activity or fluid output. No reduction in the rate of contractile activity was observed in the cecum with any test solutions, except 100 mM butyric acid. The data suggest that SCFAs inhibit smooth muscle contractility and resultant fluid transit.

Keywords:acetic acid, butyric acid, propionic acid, short chain fatty acid, animal tissue, article, cecum, colon motility, colon secretion, controlled study, dose response, fluid transport, intestine fluid, large intestine, male, nonhuman, priority journal, rat, strain gauge transducer, Animal, Body Fluids, Colon, Fatty Acids, Gastrointestinal Motility, In Vitro, Isotonic Solutions, Osmolar Concentration, Rats, Rats, Inbred Strains
Subjects:C Biological Sciences > C700 Molecular Biology, Biophysics and Biochemistry
B Subjects allied to Medicine > B120 Physiology
Divisions:College of Science > School of Life Sciences
ID Code:14574
Deposited On:25 Jul 2014 10:32

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