5-oxoETE triggers nociception in constipation-predominant irritable bowel syndrome through MAS-related G protein–coupled receptor D

Bautzova, T. et al. (2018) 5-oxoETE triggers nociception in constipation-predominant irritable bowel syndrome through MAS-related G protein–coupled receptor D. Science Signaling, 11(561), eaal2171. (doi: 10.1126/scisignal.aal2171) (PMID:30563864) (PMCID:PMC6411128)

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Irritable bowel syndrome (IBS) is a common gastrointestinal disorder that is characterized by chronic abdominal pain concurrent with altered bowel habit. Polyunsaturated fatty acid (PUFA) metabolites are increased in abundance in IBS and are implicated in the alteration of sensation to mechanical stimuli, which is defined as visceral hypersensitivity. We sought to quantify PUFA metabolites in patients with IBS and evaluate their role in pain. Quantification of PUFA metabolites by mass spectrometry in colonic biopsies showed an increased abundance of 5-oxoeicosatetraenoic acid (5-oxoETE) only in biopsies taken from patients with IBS with predominant constipation (IBS-C). Local administration of 5-oxoETE to mice induced somatic and visceral hypersensitivity to mechanical stimuli without causing tissue inflammation. We found that 5-oxoETE directly acted on both human and mouse sensory neurons as shown by lumbar splanchnic nerve recordings and Ca2+ imaging of dorsal root ganglion (DRG) neurons. We showed that 5-oxoETE selectively stimulated nonpeptidergic, isolectin B4 (IB4)–positive DRG neurons through a phospholipase C (PLC)– and pertussis toxin–dependent mechanism, suggesting that the effect was mediated by a G protein–coupled receptor (GPCR). The MAS-related GPCR D (Mrgprd) was found in mouse colonic DRG afferents and was identified as being implicated in the noxious effects of 5-oxoETE. Together, these data suggest that 5-oxoETE, a potential biomarker of IBS-C, induces somatic and visceral hyperalgesia without inflammation in an Mrgprd-dependent manner. Thus, 5-oxoETE may play a pivotal role in the abdominal pain associated with IBS-C.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hughes, Dr David I
Authors: Bautzova, T., Hockley, J. R.F., Perez-Berezo, T., Pujo, J., Tranter, M. M., Desormeaux, C., Barbaro, M. R., Basso, L., Le Faouder, P., Rolland, C., Malapert, P., Moqrich, A., Eutamene, H., Denadai-Souza, A., Vergnolle, N., Smith, E. S. J., Hughes, D. I., Barbara, G., Dietrich, G., Bulmer, D. C., and Cenac, N.
College/School:College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience
Journal Name:Science Signaling
Publisher:American Association for the Advancement of Science
ISSN (Online):1937-9145
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Science Signalling 11(561): eaal2171
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
737031Determining the role of calretinin-RorB spinal interneurons in modulating mechanical painDavid I HughesBiotechnology and Biological Sciences Research Council (BBSRC)BB/P007996/1INP - CENTRE FOR NEUROSCIENCE