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Palmitoylethanolamide and stearoylethanolamide levels in the interstitium of the trapezius muscle of women with chronic widespread pain and chronic neck-shoulder pain correlate with pain intensity and sensitivity
Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medical and Health Sciences, Rehabilitation Medicine. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Anaesthetics, Operations and Specialty Surgery Center, Pain and Rehabilitation Center. Östergötlands Läns Landsting, Heart and Medicine Center, Occupational and Environmental Medicine Center.
Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Anaesthetics, Operations and Specialty Surgery Center, Pain and Rehabilitation Center.
Linköping University, Department of Medical and Health Sciences, Division of Community Medicine. Linköping University, Faculty of Health Sciences.
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2013 (English)In: Pain, ISSN 0304-3959, E-ISSN 1872-6623, Vol. 154, no 9, 1649-1658 p.Article in journal (Refereed) Published
Abstract [en]

Chronic widespread pain (CWP) is a complex condition characterized by central hyperexcitability and altered descending control of nociception. However, nociceptive input from deep tissues is suggested to be an important drive. N-Acylethanolamines (NAEs) are endogenous lipid mediators involved in regulation of inflammation and pain. Previously we have reported elevated levels of the 2 NAEs, the peroxisome proliferator-activated receptor type-alpha ligand N-palmitoylethanolamine (PEA) and N-stearoylethanolamine (SEA) in chronic neck/shoulder pain (CNSP). In the present study, the levels of PEA and SEA in women with CWP (n = 18), CNSP (n = 34) and healthy controls (CON, n = 24) were investigated. All subjects went through clinical examination, pressure pain threshold measurements and induction of experimental pain in the tibialis anterior muscle. Microdialysis dialysate of the trapezius was collected before and after subjects performed a repetitive low-force exercise and analyzed by mass spectrometry. The levels of PEA and SEA in CNSP were significantly higher post exercise compared with CWP, and both pre and post exercise compared with CON. Levels of both NAEs decreased significantly pre to post exercise in CWP. Intercorrelations existed between aspects of pain intensity and sensitivity and the level of the 2 NAEs in CWP and CNSP. This is the first study demonstrating that CNSP and CWP differ in levels of NAEs in response to a low-force exercise which induces pain. Increases in pain intensity as a consequence of low-force exercise were associated with low levels of PEA and SEA in CNSP and CWP. These results indicate that PEA and SEA have antinociceptive roles in humans.

Place, publisher, year, edition, pages
Elsevier , 2013. Vol. 154, no 9, 1649-1658 p.
Keyword [en]
N-Acylethanolamines, Cannabinoid, Palmitoylethanolamide, Pain, Microdialysis, Myalgia, Widespread pain
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-97651DOI: 10.1016/j.pain.2013.05.002ISI: 000323600000022OAI: oai:DiVA.org:liu-97651DiVA: diva2:650005
Note

Funding Agencies|Swedish Council for Working Life and Social Research||Swedish Research Council||IngaBritt and Arne Lundberg foundation||

Available from: 2013-09-19 Created: 2013-09-19 Last updated: 2017-12-06

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Ghafouri, NazdarGhafouri, BijarLarsson, BrittStensson, NiclasGerdle, Björn

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