Clinical Rheumatology

, Volume 29, Issue 12, pp 1403–1412 | Cite as

Abnormal overexpression of mastocytes in skin biopsies of fibromyalgia patients

  • Ignacio Blanco
  • Nana Béritze
  • Mario Argüelles
  • Victoriano Cárcaba
  • Fernando Fernández
  • Sabina Janciauskiene
  • Katerina Oikonomopoulou
  • Frederick J. de Serres
  • Enrique Fernández-Bustillo
  • Morley D. Hollenberg
Original Article

Abstract

Formalin-fixed, paraffin-embedded skin tissue sections were collected from a matched cohort of 63 fibromyalgia syndrome (FMS) patients and 49 volunteers from the general population with both alpha1-antitrypsin (AAT) normal and deficiency variants. These tissues were examined for the expression of the broad-spectrum inhibitor AAT, the serine proteinases elastase and tryptase, the proinflammatory cytokines MCP-1 and TNFα, the endothelium biomarker VEGF, and the inflammation/nociception-related receptor PAR2. The most relevant finding of the study was a significantly increased number of mast cells (MCs) in the papillary dermis of all FMS patients (greater than or equal to five to 14 per microscopic high power field) compared to zero to one in controls (p < 0.001). MCs strongly stained with tryptase, AAT and PAR2 antibodies, exhibited a spindle-like shape and were uniformly distributed around blood vessels and appendages. MCP-1 and VEGF expressed weak/moderate positivity in most samples, with a higher expression in controls than in FMS patients (p < 0.001 and 0.051, respectively). No differences in elastase and TNFα were found between both groups. Moreover, no histological differences were found between samples from AAT deficiency and normal AAT phenotypes. Our results indicate that FMS is a MC-associated condition. MCs are present in skin and mucosal surfaces throughout the human body, and are easily stimulated by a number of physical, psychological, and chemical triggers to degranulate, releasing several proinflammatory products which are able to generate nervous peripheral stimuli causing CNS hypersensitivity, local, and systemic symptoms. Our findings open new avenues of research on FMS mechanisms and will benefit the diagnosis of patients and the development of therapeutics.

Keywords

Alpha 1-antitrypsin Fibromyalgia Mast cell Skin biopsy Tryptase 

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Copyright information

© Clinical Rheumatology 2010

Authors and Affiliations

  • Ignacio Blanco
    • 1
  • Nana Béritze
    • 2
  • Mario Argüelles
    • 2
  • Victoriano Cárcaba
    • 1
  • Fernando Fernández
    • 3
  • Sabina Janciauskiene
    • 4
  • Katerina Oikonomopoulou
    • 5
    • 6
  • Frederick J. de Serres
    • 7
  • Enrique Fernández-Bustillo
    • 8
  • Morley D. Hollenberg
    • 9
  1. 1.Department of Internal MedicineValle del Nalón HospitalLangreoSpain
  2. 2.Department of PathologyCabueñes HospitalGijónSpain
  3. 3.Department of SurgeryValle del Nalón HospitalLangreoSpain
  4. 4.Department of Respiratory MedicineHannover Medical SchoolHannoverGermany
  5. 5.Department of Physiology & PharmacologyUniversity of CalgaryCalgaryCanada
  6. 6.Department of MedicineUniversity of CalgaryCalgaryCanada
  7. 7.Center for the Evaluation of Risks to Human ReproductionNational Institute of Environmental Health SciencesResearch Triangle ParkUSA
  8. 8.Biostatistics UnitCentral University Hospital of AsturiasOviedoSpain
  9. 9.Department of Physiology & PharmacologyMedicine University of Calgary Faculty of Medicine CalgaryCalgaryCanada

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