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Gene-to-gene interactions regulate endogenous pain modulation in fibromyalgia patients and healthy controls-antagonistic effects between opioid and serotonin-related genes.

Journal article
Authors Jeanette Tour
Monika Löfgren
Kaisa Mannerkorpi
Björn Gerdle
Anette Larsson
Annie Palstam
Indre Bileviciute-Ljungar
Jan Bjersing
Ingvar Martin
Malin Ernberg
Martin Schalling
Eva Kosek
Published in Pain
Volume 158
Issue 7
Pages 1194-1203
ISSN 1872-6623
Publication year 2017
Published at Institute of Neuroscience and Physiology, Department of Health and Rehabilitation
University of Gothenburg Centre for person-centred care (GPCC)
Institute of Medicine, Department of Rheumatology and Inflammation Research
Pages 1194-1203
Language en
Links dx.doi.org/10.1097/j.pain.000000000...
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Rheumatology and Autoimmunity

Abstract

Chronic pain is associated with dysfunctional endogenous pain modulation, involving both central opioid and serotonergic (5-HT) signaling. Fibromyalgia (FM) is a chronic pain syndrome, characterized by widespread musculoskeletal pain and reduced exercise-induced hypoalgesia (EIH). In this study, we assessed the effects of 3 functional genetic polymorphisms on EIH in 130 patients with FM and 132 healthy controls. Subjects were genotyped regarding the mu-opioid receptor (OPRM1) gene (rs1799971), the serotonin transporter (5-HTT) gene (5-HTTLPR/rs25531), and the serotonin-1a receptor (5-HT1a) gene (rs6296). The patients with FM had increased pain sensitivity and reduced EIH compared with healthy controls. None of the polymorphisms had an effect on EIH on their own. We found significant gene-to-gene interactions between OPRM1 x 5-HTT and OPRM1 x 5-HT1a regarding activation of EIH, with no statistically significant difference between groups. Better EIH was found in individuals with genetically inferred strong endogenous opioid signaling (OPRM1 G) in combination with weak 5-HT tone (5-HTT low/5-HT1a G), compared with strong 5-HT tone (5-HTT high/5-HT1a CC). Based on the proposed mechanisms of these genetic variants, the findings indicate antagonistic interactions between opioid and serotonergic mechanisms during EIH. Moreover, despite different baseline pain level, similar results were detected in FM and controls, not supporting an altered interaction between opioid and 5-HT mechanisms as the basis for dysfunction of EIH in patients with FM. In summary, our results suggest that, by genetic association, the mu-opioid receptor interacts with 2 major serotonergic structures involved in 5-HT reuptake and release, to modulate EIH.

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