The Effect of Serotonergic Modulation on Intestinal Permeability and Visceral Hypersensitivity in Healthy Individuals and Irritable Bowel Syndrome (IBS) Patients

Summary

Serotonin, 5-hydroxytryptamin (5-HT), plays an important role in regulating the gastrointestinal functions. In this study we will modulate the serotonin system with acute tryptophan depletion (ATD) and administration of 5-hydroxytryptophan (5-HTP). ATD is based on ingestion of an amino acid drink devoid of the precursor of serotonin and hence caused a decreased serotonin level. 5-hydroxy-tryptophan is the direct precursor of serotonin and its administration, an increased serotonin level is expected. During these interventions, gut permeability and visceral sensitivity will be measured in healthy individuals and patients with irritable bowel syndrome, which is characterized by altered permeability and visceral hypersensitivity.

Timeline

Start

2009-04

Primary completion

2011-05

Completion

2011-05

Publications

• Results Keszthelyi D, Troost FJ, Jonkers DM, van Eijk HM, Lindsey PJ, Dekker J, Buurman WA, Masclee AA. Serotonergic reinforcement of intestinal barrier function is impaired in irritable bowel syndrome. Aliment Pharmacol Ther. 2014 Aug;40(4):392-402. doi: 10.1111/apt.12842. Epub 2014 Jun 18.
• Results Keszthelyi D, Troost FJ, Jonkers DM, Kruimel JW, Leue C, Masclee AA. Decreased levels of kynurenic acid in the intestinal mucosa of IBS patients: relation to serotonin and psychological state. J Psychosom Res. 2013 Jun;74(6):501-4. doi: 10.1016/j.jpsychores.2013.01.008. Epub 2013 Feb 15.
• Results Keszthelyi D, Troost FJ, Jonkers DM, van Donkelaar EL, Dekker J, Buurman WA, Masclee AA. Does acute tryptophan depletion affect peripheral serotonin metabolism in the intestine? Am J Clin Nutr. 2012 Mar;95(3):603-8. doi: 10.3945/ajcn.111.028589. Epub 2012 Feb 1.

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Indications