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Saturday, December 20, 2014

Study Provides More Evidence that Gulf War Illness and CFS/ME are different conditions

The journal article below, published earlier this year, provides more evidence that Gulf War Illness and Chronic Fatigue Sydrome/Myalgic Encephalitis (CFS/ME) are different conditions.

This study, by Dr. Svetlana Khaiboullina et al,  demonstrates that pro-inflammatory cytokines show different profiles in the two conditions.  Cytokines are small proteins released by cells; pro-inflammatory cytokines are related to the body's inflammation response.  They can be found and measured in certain body fluids.

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SOURCE:

http://www.sciencedirect.com/science/article/pii/S1043466614006024

ARCHIVED ARTICLE:


Volume 72, Issue 1, March 2015, Pages 1–8

Cytokine expression provides clues to the pathophysiology of Gulf War illness and myalgic encephalomyelitis

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Highlights

Gulf War illness (GWI) is characterized by a Th1/Th17 shift.
Th1, Th2 and inflammatory cytokines characterize myalgic encephalomyelitis (ME).
Cytokine importance by Random Forest were IL-7, IL-4, TNF-α, IL-13, and IL-17F.
GWI and ME have distinct cytokine profiles despite similar symptomology.

Abstract

Gulf War illness (GWI) is a chronic disease of unknown etiology characterized by persistent symptoms such as cognitive impairment, unexplained fatigue, pervasive pain, headaches, and gastrointestinal abnormalities. Current reports suggest that as many as 200,000 veterans who served in the 1990–1991 Persian Gulf War were afflicted. Several potential triggers of GWI have been proposed including chemical exposure, toxins, vaccines, and unknown infectious agents. However, a definitive cause of GWI has not been identified and a specific biological marker that can consistently delineate the disease has not been defined. 
Myalgic encephalomyelitis (ME) is a disease with similar and overlapping symptomology, and subjects diagnosed with GWI typically fit the diagnostic criteria for ME. For these reasons, GWI is often considered a subgroup of ME. 
To explore this possibility and identify immune parameters that may help to understand GWI pathophysiology, we measured 77 serum cytokines in subjects with GWI and compared these data to that of subjects with ME as well as healthy controls. Our analysis identified a group of cytokines that identified ME and GWI cases with sensitivities of 92.5% and 64.9%, respectively. The five most significant cytokines in decreasing order of importance were IL-7, IL-4, TNF-α, IL-13, and IL-17F. When delineating GWI and ME cases from healthy controls, the observed specificity was only 33.3%, suggesting that with respect to cytokine expression, GWI cases resemble control subjects to a greater extent than ME cases across a number of parameters. 
These results imply that serum cytokines are representative of ME pathology to a greater extent than GWI and further suggest that the two diseases have distinct immune profiles despite their overlapping symptomology.

Keywords

  • Cytokines
  • Gulf War illness
  • Myalgic encephalomyelitis
  • Cytokines
  • Random forest: interleukin-7
Corresponding author at: Department of Biochemistry and Molecular Biology, University of Nevada School of Medicine, 1664 N Virginia St, MS 0330, Reno, NV, USA. Tel.: +1 775 682 8278; fax: +1 775 682 8258.
1
Current address: Institute of Fundamental Medicine and Biology, Kazan Federal University, Russian Federation.

Small Fiber Peripheral Neuropathy Found to Underlie Pain in Some Gulf War Illness Patients

The following journal article about diagnosable small-fiber peripheral neuropathy (SFPN) underlying chronic pain and multi-system symptoms, is based in part on Gulf War Illness research funded under the treatment-focused Gulf War Illness Congressionally Directed Medical Research Program (CDMRP) and Fiscal Year 2009 funding.  [GW093049]

This CDMRP vignette with Dr. Oaklander provides additional insight into the CDMRP-funded research project:  http://cdmrp.army.mil/pubs/video/gwi/klein_oaklander_video_text.shtml

In another study reported earlier this year (M. Li et al, "Self-reported post-exertional fatigue in Gulf War veterans: roles of autonomic testing," http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3882719), SFPN was also found in some -- but not a majority -- of Gulf War Illness patients. 

And, these 91outcomes articles describe published journal articles on SFPN in fibromyalgia, a neurological condition that includes chronic widespread pain as a core symptom:  

http://www.91outcomes.com/2013/08/boston-researcher-finds-nerve-damage-in.html

http://www.91outcomes.com/2012/12/small-fiber-neuropathy-found-in.html

It is becoming clear that differential diagnosis for pain in Gulf War veterans with chronic pain should include comprehensive testing for the possible presence of SFPN.

This 2010 91outcomes article discusses testing available (at that time) for SFPN:  http://www.91outcomes.com/2010/01/new-test-for-small-fiber-peripheral.html?q=SFPN

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SOURCE:  Molecular Pain, Dr. Anne L. Oaklander et al, published December 15, 2014

http://www.molecularpain.com/content/10/S1/O12/

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Open AccessOral presentation

Small-fiber polyneuropathy (SFPN), a common underlying diagnosis in syndromes involving unexplained chronic pain and multi-system symptoms

Anne Louise Oaklander12*Heather Downs1Zeva Daniela Herzog1 and Max Klein1
  • *Corresponding author: Anne L Oaklander 


1Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
2Departments of Pathology (Neuropathology), Massachusetts General Hospital, Boston, MA 02114, USA
For all author emails, please log on.


Molecular Pain 2014, 10(Suppl 1):O12  doi:10.1186/1744-8069-10-S1-O12
The electronic version of this article is the complete one and can be found online at: http://www.molecularpain.com/content/10/S1/O12

Published:15 December 2014
© 2014 Oaklander et al; licensee BioMed Central Ltd. 
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.


Background

Syndromes involving unexplained chronic widespread pain (CWP) and multi-system symptoms are common, with 1-5% prevalence for fibromyalgia alone. They more often affect females and cause disability and high costs [1-3]. Other common syndromes include chronic fatigue, seronegative Lyme, and Gulf War Illness. Fragmentary syndromes include TMJD, POTS, CRPS, irritable bowel). These syndromes are particularly devastating in children and young adults, where they interfere with education and development and disrupt entire families [4-6]. SFPN is known to cause CWP and multi-system complaints in older adults. Unlike the syndromes above, SFPN can be objectively diagnosed by measuring innervation in lower-leg skin biopsies, and autonomic functions testing (AFT) of heart rate, blood pressure and sweating [7]. SFPN has several established causes including diabetes, infections, cancer, and toxins. Many causes are diagnosable, treatable, and sometimes curable [8]. Our work suggests that unrecognized SFPN contributes to several syndromes involving CWP and multi-organ symptoms.

Materials and methods

With IRB permission, we retrospective analyzed the medical records of 41 patients with onset of unexplained CWP and multisymptoms before age 21; most had objective testing for SFPN [9]. We also prospectively studied 27 adult patients with fibromyalgia and 30 healthy volunteers using history, examination, skin biopsies and AFT [10].

Results

Retrospective chart review identified definite (in 59%) and probable SFPN (in 17%) among the young patients with onset before age 21 [9]. We characterized the clinical features, diagnostic, and treatment options for this new early-onset SFPN. Studying children, who lacked the typical causes of late-onset SFPN, implicated autoimmune causality in most. Among patients treated with immunomodulatory therapies, pain and other symptoms improved in 2/3 [9]. Among adults with fibromyalgia, 41% of skin biopsies from subjects with fibromyalgia vs. 3% of biopsies from controls were diagnostic for SFPN, and symptom and examination scores were higher in fibromyalgia subjects than in controls (all P ≤ 0.001) [10]. All fibromyalgia patients diagnosed with SFPN then had blood tests for all known causes [8]. None had diabetes but 62% had test-results consistent with dysimmunity, and some had genetic causes [10]. Other laboratories have now also linked fibromyalgia to SFPN [11-15].

Conclusions

Some patients with unexplained widespread pain and multi-system syndromes such as fibromyalgia have objectively diagnosable SFPN. SFPN can affect children and young adults, not just older adults. Multiple lines of evidence suggest that early-onset SFPN has novel causes that can be treated. The prevalence of SFPN among TMJD patients is unstudied.

Disclosures

None of the authors have any conflicts of interest.

Acknowledgements

Supported in part by the NIH (NINDS K24NS059892, Department of Defense grant GW093049, and donations from the Bradley, Collman, and Cheever Powell family foundations.

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