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Gastroenterology. 1996 Nov;111(5):1281-90.

Distinct 5-HT receptors mediate the peristaltic reflex induced by mucosal stimuli in human and guinea pig intestine.

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  • 1Department of Physiology, Medical College of Virginia, Richmond, USA.

Abstract

BACKGROUND & AIMS:

The role of 5-hydroxytryptamine (5-HT) in regulating the peristaltic reflex in humans is unknown. The neural pathways subserving peristalsis induced by mucosal stimulation were characterized in human jejunum and guinea pig colon.

METHODS:

Compartmented flat-sheet preparations that enable measurement of 5-HT and sensory transmitter release into one compartment and mechanical responses in adjacent compartments were used.

RESULTS:

Mucosal stimuli (2-8 brush strokes) caused concomitant release of 5-HT and calcitonin gene-related peptide (CGRP) into the compartment where stimulation was applied in both species; in contrast, muscle stretch caused release of CGRP only. CGRP release as well as ascending contraction and descending relaxation of circular muscle induced by mucosal stimulation were inhibited by a selective 5-HT4 antagonist in human jejunum and by selective 5-HT4 and 5-HT3 antagonists in guinea pig colon. The effects of the 5-HT3 and 5-HT4 antagonists in guinea pig colon were additive. A selective 5-HT1P antagonist mimicked the effect of the 5-HT4 antagonist. The CGRP antagonist human CGRP8-37 inhibited ascending and descending responses in both species.

CONCLUSIONS:

5-HT released by mucosal stimulation initiates a peristaltic reflex by activating 5-HT4/5-HT1P receptors on sensory CGRP neurons in human intestine and 5-HT4/5-HT1P and 5-HT3 receptors in guinea pig colon.

PMID:
8898642
[PubMed - indexed for MEDLINE]
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