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The Relationship of Endocannabinoidome Lipid Mediators With Pain and Psychological Stress in Women With Fibromyalgia: A Case-Control Study

  • Niclas Stensson
    Correspondence
    Address reprint requests to Niclas Stensson, PhD, Department of Medical and Health Sciences, Pain and Rehabilitation Centre, University Hospital, Hälsans Hus SE 581 85, 58185 Linköping, Sweden.
    Affiliations
    Pain and Rehabilitation Centre, Department of Medical and Health Sciences, Linköping University, Linköping, Sweden.
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  • Nazdar Ghafouri
    Affiliations
    Pain and Rehabilitation Centre, Department of Medical and Health Sciences, Linköping University, Linköping, Sweden.
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  • Malin Ernberg
    Affiliations
    Department of Dental Medicine, Karolinska Institute and Scandinavian Centre for Orofacial Neurosciences, Huddinge, Sweden.
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  • Kaisa Mannerkorpi
    Affiliations
    Physiotherapy, Section of Health and Rehabilitation, Department of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.

    Centre for Person Centred Care, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
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  • Eva Kosek
    Affiliations
    Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden.

    Stockholm Spine Centre, Löwenströmska Hospital, Stockholm, Sweden.
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  • Björn Gerdle
    Affiliations
    Pain and Rehabilitation Centre, Department of Medical and Health Sciences, Linköping University, Linköping, Sweden.
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  • Bijar Ghafouri
    Affiliations
    Pain and Rehabilitation Centre, Department of Medical and Health Sciences, Linköping University, Linköping, Sweden.
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      Abstract

      Characterized by chronic widespread pain, generalized hyperalgesia, and psychological stress, fibromyalgia (FM) is difficult to diagnose and lacks effective treatments. Endocannabinoids—arachidonoylethanolamide (AEA), 2-arachidonoylglycerol (2-AG), and the related oleoylethanolamide (OEA), palmitoylethanolamide (PEA), and stearoylethanolamide (SEA)—are endogenous lipid mediators with analgesic and anti-inflammatory characteristics, in company with psychological modulating properties (eg, stress and anxiety), and are included in a new emerging “ome,” the endocannabinoidome. This case-control study compared the concentration differences of AEA, OEA, PEA, SEA, and 2-AG in 104 women with FM and 116 healthy control subjects. All participants rated their pain, anxiety, depression, and current health status. The relationships between the lipid concentrations and the clinical assessments were investigated using powerful multivariate data analysis and traditional bivariate statistics. The concentrations of OEA, PEA, SEA, and 2-AG were significantly higher in women with FM than in healthy control subjects; significance remained for OEA and SEA after controlling for body mass index and age. 2-AG correlated positively with FM duration and body mass index, and to some extent negatively with pain, anxiety, depression, and health status. In FM, AEA correlated positively with depression ratings. The elevated circulating levels of endocannabinoidome lipids suggest that these lipids play a role in the complex pathophysiology of FM and might be signs of ongoing low-grade inflammation in FM. Although the investigated lipids are significantly altered in FM, their biological roles are uncertain with respect to the clinical manifestations of FM. Thus plasma lipids alone are not good biomarkers for FM.

      Perspective

      This study reports about elevated plasma levels of endocannabinoidome lipid mediators in FM. The lipids’ suitability to work as biomarkers for FM in the clinic were low; however, their altered levels indicate that a metabolic asymmetry is ongoing in FM, which could serve as a baseline during explorative FM pain management.

      Key words

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