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Reduced Intraepidermal Nerve Fiber Density in Skin of Fibromyalgia Patients

  [ 8 votes ]   [ 1 Comment ]
By Michalis L. Kosmidis, et al. • www.ProHealth.com • October 14, 2014


Editor's comment: Intraepidermal nerve fibers are the nerve fibers located within the outermost layers of skin. This study supports several other recent studies showing that a subset of fibromyalgia patients have small fiber neuropathy.

Reduction of Intraepidermal Nerve Fiber Density (IENFD) in the skin biopsies of patients with fibromyalgia: A controlled study.

Abstract:

OBJECTIVES: Fibromyalgia (FM) is one of the most common chronic pain syndromes. Various pathogenetic mechanisms have been implicated but none is proven. Our scope was to determine if Intraepidermal Nerve Fiber Density (IENFD) is reduced in the skin of FM patients, as observed in patients with painful small fiber sensory neuropathy (SFSN).

DESIGN, SETTING AND PARTICIPANTS: We prospectively studied 46 FM patients (5 men and 41 women), aged 29 to 76 (mean: 52.5) years, diagnosed according to the ACR 2010 criteria, and 34 controls (18 women and 16 men) aged 19 to 84 (mean: 31.7) years. IENFD was measured using published guidelines and immune markers were sought immunocytochemically. In 30 FM patients, pain intensity was assessed with the Neuropathic Pain Symptom Inventory (NPSI), a scale validated for neuropathic pain.

RESULTS: 15 of 46 (32.6%) FM patients had reduced IENFD [range: 0.6-12.5fibers/mm (mean: 4.83 SD: 2.5)], compared to healthy controls [2.8-11.5fibers/mm (mean: 7.35, SD: 1.85)] (p<0.0001). No significant correlation was noticed between NPSI scores and IENFD. No difference in the Langerhans cells, the major Antigen Presenting Cells (APCs) in the epidermis, or in IL-6 staining, was noted between FM and controls. IENFD was equally reduced in a subset of FM patients who also had another autoimmune disease.

CONCLUSION: This is one of the largest series of FM patients demonstrating a significant reduction of IENFD in their skin biopsies. The findings indicate that in a subset of FM patients, the pain syndrome is, at least partially, of neuropathic origin. Skin biopsy may prove a useful tool and a potential biomarker in future studies of FM patients.

Copyright © 2014. Published by Elsevier B.V.

Source: Journal of the Neurological Sciences, September 28, 2014. By Michalis L. Kosmidis, Loukia Koutsogeorgopoulou, Harry Alexopoulos, Ioanna Mamali, Panagiotis G. Vlachoyiannopoulos, Michalis Voulgarelis, Haralampos M. Moutsopoulos, Athanasios G. Tzioufas and Marinos C. Dalakas. Neuroimmunology Unit, Department of Pathophysiology, Faculty of Medicine, National and Kapodistrian University of Athens, Athens, Greece.




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Article Comments Post a Comment

Evidence confirms FM is biological
Posted by: SiSiRN
Oct 16, 2014
This study is yet another to suggest small nerve fiber density is reduced in the skin of FM patients. I hope this will lead to robust research into the involvement of the immune system, nociception, and glial cells (as discussed in our book Integrative Therapies for Fibromyalgia, Chronic Fatigue Syndrome, and Myofascial Pain. Evidence immune and SFN biomarkers are mounting. This makes it undeniable that fibromyalgia is a biological illness.
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