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Original Article

Effect of Dopamine on Bethanechol-Stimulated Gastric Antral Motility in Dogs with Gastric Fistula

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Pages 945-951 | Received 02 Nov 1981, Accepted 06 Apr 1982, Published online: 19 Feb 2010
 

Abstract

The purpose of the present study was to evaluate the effect of dopamine on gastric antral motility in conscious dogs with gastric fistula, using intraluminal strain-gauge transducers. Infusion of bethanechol increased the motility with regard to both frequency and strength. Dopamine, an endogenous catecholamine, was used alone and in conjunction with selective blockade of adrenergic and dopaminergic receptors. The stimulated antral motility was dose-dependently inhibited by dopamine. The effect was significantly blocked by the peripherally acting dopaminergic blocker domperidone. The α-adrenoceptor blocker phentolamine reduced the effect of dopamine to some extent, but the reduction was not of statistical significance. The dopamine-inhibited motility was not altered by the β1-adrenoceptor blocker practolol or the β1 + β2-adrenoceptor blocker propranolol. This indicates that dopamine acts on gastric antral motility predominantly through dopaminergic receptors. β-Adrenergic receptors, which are active in the impairment of gastric acid secretion, do not seem to be involved in the motility response. Dose-response investigations with five increasing doses of bethanechol and one dose of dopamine showed inhibition of a non-competitive type.

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