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The effect and mechanism of action of capsaicin on gastric acid output

  • Original Article—Alimentary Tract
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Abstract

Background

Capsaicin has beneficial pharmacological properties, such as the ability to improve appetite and digestion. However, capsaicin has been reported to suppress gastric acid output, but to increase secretion; no consensus as to its effects on gastric acid output has been reached, and the underlying mechanisms remain to be elucidated.

Methods

Rat gastric lumen was perfused with capsaicin. Basal acid output and gastric acid secretion stimulated by vagal nerve activation and bethanecol, a muscarinic receptor agonist, were measured. After intravenous infusion of calcitonin gene-related peptide (CGRP), the measurements were repeated. The secretion of gastrin, somatostatin, and histamine was measured in isolated vascularly perfused rat stomach after vagal nerve and bethanecol stimulation, and under the influence of capsaicin.

Results

Capsaicin administration had no effect on basal gastric acid output, but inhibited acid secretion resulting from vagal stimulation. Capsaicin had no effect on acid secretion resulting from stimulation with bethanecol. Administration of high-dose CGRP inhibited basal acid output and gastric acid secretion from both vagal nerve and bethanecol stimulation. Low-dose CGRP inhibited gastric acid secretion because of vagal stimulation, but had no effect on basal secretion or acid secretion following stimulation with bethanecol. Capsaicin administration inhibited the stimulated gastrin and histamine secretion and reversed the suppression of somatostatin secretion mediated by vagal stimulation. However, capsaicin had no effect on stimulated gastrin secretion, suppression of somatostatin secretion, or stimulated histamine secretion because of bethanecol.

Conclusions

Capsaicin inhibited gastric acid output, and the mechanism underlying this effect appears to involve vagal nerve inactivation.

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Authors and Affiliations

  1. Division of Gastroenterology and Hepatology, Department of Medicine, Nihon University School of Medicine, 30-1 Oyaguchi Kamimachi, Itabashi-ku, Tokyo, 173-8610, Japan

    Kazuhiro Imatake, Teruaki Matsui & Mitsuhiko Moriyama

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  1. Kazuhiro Imatake
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  2. Teruaki Matsui
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  3. Mitsuhiko Moriyama
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Correspondence to Kazuhiro Imatake.

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Imatake, K., Matsui, T. & Moriyama, M. The effect and mechanism of action of capsaicin on gastric acid output. J Gastroenterol 44, 396–404 (2009). https://doi.org/10.1007/s00535-009-0018-x

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  • DOI: https://doi.org/10.1007/s00535-009-0018-x

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