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Effects of dietary amines on the gut and its vasculature

  • Kenneth J. Broadley (a1), M. Akhtar Anwar (a1), Amy A. Herbert (a1), Martina Fehler (a1), Elen M. Jones (a1), Wyn E. Davies (a1), Emma J. Kidd (a1) and William R. Ford (a1)...

Abstract

Trace amines, including tyramine and β-phenylethylamine (β-PEA), are constituents of many foods including chocolate, cheeses and wines and are generated by so-called ‘friendly’ bacteria such as Lactobacillus, Lactococcus and Enterococcus species, which are found in probiotics. We therefore examined whether these dietary amines could exert pharmacological effects on the gut and its vasculature. In the present study we examined the effects of tyramine and β-PEA on the contractile activity of guinea-pig and rat ileum and upon the isolated mesenteric vasculature and other blood vessels. Traditionally, these amines are regarded as sympathomimetic amines, exerting effects through the release of noradrenaline from sympathetic nerve endings, which should relax the gut. A secondary aim was therefore to confirm this mechanism of action. However, contractile effects were observed in the gut and these were independent of noradrenaline, acetylcholine, histamine and serotonin receptors. They were therefore probably due to the recently described trace amine-associated receptors. These amines relaxed the mesenteric vasculature. In contrast, the aorta and coronary arteries were constricted, a response that was also independent of a sympathomimetic action. From these results, we propose that after ingestion, trace amines could stimulate the gut and improve intestinal blood flow. Restriction of blood flow elsewhere diverts blood to the gut to aid digestion. Thus, trace amines in the diet may promote the digestive process through stimulation of the gut and improved gastrointestinal circulation.

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Copyright

Corresponding author

*Corresponding author: Professor Kenneth J. Broadley, fax +44 2920 874149, email broadleykj@cardiff.ac.uk

References

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Keywords

Effects of dietary amines on the gut and its vasculature

  • Kenneth J. Broadley (a1), M. Akhtar Anwar (a1), Amy A. Herbert (a1), Martina Fehler (a1), Elen M. Jones (a1), Wyn E. Davies (a1), Emma J. Kidd (a1) and William R. Ford (a1)...

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