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Am J Physiol Gastrointest Liver Physiol 255: G12-G17, 1988;
0193-1857/88 $5.00
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AJP - Gastrointestinal and Liver Physiology, Vol 255, Issue 1 12-G17, Copyright © 1988 by American Physiological Society

ARTICLES

Effects of intraluminal nutrients on intestinal myoelectric activity in rabbits

T. Bouyssou, M. Pairet, M. Candau and Y. Ruckebusch
Department of Physiology, Ecole Nationale Veterinaire, Toulouse, France.

In the unanesthetized rabbit, intraluminal infusions of D- and L-methionine, L-tryptophan, D-glucose, D-xylose, and lactulose had a biphasic effect on small intestinal myoelectric activity. A phase of enhanced activity was followed by a phase of inhibition. The excitatory phase was mimicked by saline solutions equiosmolar to the test solutions. The subsequent inhibition was does dependent and significantly (P less than 0.01) longer for the passively absorbed D-methionine than for the L-stereoisomer. The inhibitory action of 10 mM D-glucose, 10 mM L-methionine, and 5 mM L-tryptophan was blocked by propranolol on the jejunum and by phenoxybenzamine on the ileum. We conclude that the initial excitatory phase induced by luminal amino acids and sugars may be dependent on an action on osmoreceptors, whereas the subsequent inhibitory phase may involve the sympathetic noradrenergic system.


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R. M. Gwynne and J. C. Bornstein
Local inhibitory reflexes excited by mucosal application of nutrient amino acids in guinea pig jejunum
Am J Physiol Gastrointest Liver Physiol, June 1, 2007; 292(6): G1660 - G1670.
[Abstract] [Full Text] [PDF]


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