A comparison of sex-specific immune signatures in Gulf War illness and chronic fatigue syndrome
Open accessAbstract
Background: Though potentially linked to the basic physiology of stress response we still have no clear understanding of Gulf War Illness (GWI), a debilitating condition presenting complex immune, endocrine and neurological symptoms. Here we compared male (n = 20) and female (n = 10) veterans with GWI separately against their healthy counterparts (n = 21 male, n = 9 female) as well as subjects with chronic fatigue syndrome/ myalgic encephalomyelitis (CFS/ME) (n = 12 male, n = 10 female). Methods: Subjects were assessed using a Graded eXercise Test (GXT) with blood drawn prior to exercise, at peak effort (VO2 max) and 4-hours post exercise. Using chemiluminescent imaging we measured the concentrations of IL-1a, 1b, 2, 4, 5, 6, 8, 10, 12 (p70), 13, 15, 17 and 23, IFNγ, TNFα and TNFβ in plasma samples from each phase of exercise. Linear classification models were constructed using stepwise variable selection to identify cytokine co-expression patterns characteristic of each subject group. Results: Classification accuracies in excess of 80% were obtained using between 2 and 5 cytokine markers. Common to both GWI and CFS, IL-10 and IL-23 expression contributed in an illness and time-dependent manner, accompanied in male subjects by NK and Th1 markers IL-12, IL-15, IL-2 and IFNγ. In female GWI and CFS subjects IL-10 was again identified as a delineator but this time in the context of IL-17 and Th2 markers IL-4 and IL-5. Exercise response also differed between sexes: male GWI subjects presented characteristic cytokine signatures at rest but not at peak effort whereas the opposite was true for female subjects. Conclusions: Though individual markers varied, results collectively supported involvement of the IL-23/Th17/IL-17 axis in the delineation of GWI and CFS in a sex-specific way.
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Female sex hormones play an important role in the onset, persistence, and symptom burden of ME/CFS.
“Since women are at higher risk of ME/CFS than men5,18, it is thought that female sex hormones play an important role in the onset, persistence, and symptom burden of this illness19.”
From Leveraging Prior Knowledge of Endocrine Immune Regulation in the Therapeutically-relevant Phenotyping of Women with Chronic Fatigue Syndrome (2019) · cites this paper as [19]
The Discussion suggests that sex hormones may modulate immune responses in CFS, and the Conclusions support a role for endocrine modulation of immunity. Neither section addresses whether female sex hormones affect ME/CFS onset, persistence, or symptom burden; those specific parts of the claim are unsupported. (LLM, conf=0.86)
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Plasma cytokine levels reveal deficiencies in IL-8 and gamma interferon in Long-COVIDPreprint
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Pharmaceutical Interventions in Chronic Fatigue Syndrome: A Literature-based Commentary
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Self-citationAcute leucocyte, muscle damage, and stress marker responses to high-intensity functional training
Gomes, J. H., Mendes, R. R., Franca, C. S., Silva‐Grigoletto, M. E. D., da Silva, D. R. P., Antoniolli, Â. R., Silva, A. M. D. O. E., & Quintans‐Júnior, L. J. (2020) · PLoS ONE · doi:10.1371/journal.pone.0243276 · Cited by 34 · see citing works
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Self-citationTracking post-infectious fatigue in clinic using routine Lab tests
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Self-citationA Neuroimmune Model of Gulf War Illness
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Pathophysiology in a model of Gulf War Illness: Contributions of pyridostigmine bromide and stress
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Fatigue in primary Sjögren’s syndrome: A proteomic pilot study of cerebrospinal fluid
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Self-citationRetractedRelationship satisfaction, communication self-efficacy, and chronic fatigue syndrome-related fatigue
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Myalgic Encephalomyelitis or What? The International Consensus Criteria
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Adaptive Immune Responses Associated with the Central Nervous System Pathology of Gulf War Illness
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HERV activation segregates ME/CFS from fibromyalgia while defining a novel nosologic entityPreprint
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The impact of post-traumatic stress on quality of life and fatigue in women with Gulf War Illness
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Self-citationAnti-Inflammatory Effects of β-Glucan in Cancer Related Fatigue
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Self-citationRetractedAn analysis of 2‐day cardiopulmonary exercise testing to assess unexplained fatigue
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When the How Outweighs the What: the Pivotal Importance of Context
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Self-citationPTSD and Immunological Correlations Of Attention and Working Memory in Gulf War Illness
Jeffrey, M. G. (2020) · NSUWorks (Nova Southeastern University)
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Self-citationEsteban, D. J., Conrad, B., Cullinan, A., Luong, S., Albaum, J. A., & WILK, V. (2026) · MicrobiologyOpen · doi:10.1002/mbo3.70333
- Authors
- Smylie, A. L., Broderick, G., Fernandes, H., Razdan, S., Barnes, Z., Collado, F., Sol, C., Fletcher, M. A., & Klimas, N.
- Affiliations
- University of Alberta (CA)
- University of Miami (US)
- Miami VA Healthcare System (US)
- Nova Southeastern University (US)
- Corresponding author
- Broderick, Gordon
- Venue
- BMC Immunology
- Published
- 2013-06-25
- Volume
- 14
- Issue
- 1
- Pages
- 29-29
- ISSN
- 1471-2172 (ISSN-L)
- PMC
- PMC3698072
- OpenAlex
- W2115959705
- Cited by
- 71
- References
- 61
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 6 · 2023: 1 · 2022: 2 · 2021: 7 · 2020: 8 · 2019: 14 · 2018: 4 · 2017: 8 · 2016: 9 · 2015: 5 · 2014: 3 · 2013: 2
- FWCI
- 4.50
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- BMC Immunology (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- NSUWorks (Nova Southeastern University) (submittedVersion)
- Funders
- U.S. Department of Defense
- U.S. Department of Veterans Affairs
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Fibromyalgia and Chronic Fatigue Syndrome Research
- Health Sciences › Medicine › Neurology › Long-Term Effects of COVID-19
- Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
- Keywords
- Gulf War illness, chronic fatigue syndrome, sex differences, cytokine signature, IL-10, IL-17, Th1/Th2 immune response, exercise response, veterans, plasma cytokines
- MeSH terms
- Adult, Female, Humans, Male, Middle Aged, Sex Characteristics, Cohort Studies, Fatigue Syndrome, Chronic, Case-Control Studies, Cytokines, Persian Gulf Syndrome, Gulf War
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