Cited by 202Fibromyalgia and Chronic Fatigue Syndrome ResearchLong-Term Effects of COVID-19Functional Brain Connectivity Studies

A formal analysis of cytokine networks in chronic fatigue syndrome

Open access
Broderick, Gordon, Fuite, Jim, Kreitz, Andrea, Vernon, Suzanne D., Klimas, Nancy, Fletcher, Mary Ann·2010·Brain Behavior and Immunity

Abstract

Chronic Fatigue Syndrome (CFS) is a complex illness affecting 4 million Americans for which no characteristic lesion has been identified. Instead of searching for a deficiency in any single marker, we propose that CFS is associated with a profound imbalance in the regulation of immune function forcing a departure from standard pre-programmed responses. To identify these imbalances we apply network analysis to the co-expression of 16 cytokines in CFS subjects and healthy controls. Concentrations of IL-1a, 1b, 2, 4, 5, 6, 8, 10, 12, 13, 15, 17 and 23, IFN-γ, lymphotoxin-α (LT-α) and TNF-α were measured in the plasma of 40 female CFS and 59 case-matched controls. Cytokine co-expression networks were constructed from the pair-wise mutual information (MI) patterns found within each subject group. These networks differed in topology significantly more than expected by chance with the CFS network being more hub-like in design. Analysis of local modularity isolated statistically distinct cytokine communities recognizable as pre-programmed immune functional components. These showed highly attenuated Th1 and Th17 immune responses in CFS. High Th2 marker expression but weak interaction patterns pointed to an established Th2 inflammatory milieu. Similarly, altered associations in CFS provided indirect evidence of diminished NK cell responsiveness to IL-12 and LT-α stimulus. These observations are consistent with several processes active in latent viral infection and would not have been uncovered by assessing marker expression alone. Furthermore this analysis identifies key sub-networks such as IL-2:IFN-γ:TNF-α that might be targeted in restoring normal immune function.

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Crossref · 10.1016/j.bbi.2010.04.012

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  • Enforcing documented co-regulatory structure to the 8 exercise-responsive markers confirmed elevated expression in ME/CFS at rest of IL-1β, IL-4, IL-5, and IL-6.

    “For example, enforcing documented co-regulatory structure to the 8 exercise responsive markers identified in this data and described above confirmed elevated expression in ME/CFS at rest of IL-1β, IL-4, IL-5 and IL-6 as reported previously by our group4.”
  • Controlling for documented regulatory mechanisms suggests IL-10, IL-17, and IFN-γ may be lower in ME/CFS subjects at rest in the context of joint marker expression, whereas previously reported unchanged on average.

    “Indeed, controlling in the context of documented regulatory mechanisms suggests here that IL-10, IL-17 and IFN-γ expression, previously reported as unchanged on average between groups4, may in fact be lower in ME/CFS subjects at rest in the context of joint marker expression.”
  • In previous work, relatively high intragroup variability in cytokine expression was observed (MAD/median > 0.50), especially in the ME/CFS group.

    “In this same previous work, relatively high intragroup variability in cytokine expression was observed (Median absolute deviation / median > 0.50), especially in the ME/CFS group.”

    From Leveraging Prior Knowledge of Endocrine Immune Regulation in the Therapeutically-relevant Phenotyping of Women with Chronic Fatigue Syndrome (2019) · cites this paper as [4]

    The Results (§3.2; page unavailable) use within-group cytokine variability to construct networks, but do not quantify variability in expression or say it was especially high in CFS. Searches for the median absolute deviation-to-median ratio and the claimed intragroup comparison found no supporting passage in our copy. (LLM, conf=0.72)

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1 retracted

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3 of the 83 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. [9]Bunke H 2000 Graph matching: Theoretical foundations, algorithms, and applications Proc. Vision Interface 2000 Montreal May 14–17 82 88
  2. [40]Maher K Klimas NG Fletcher MA Jason LA Fennell PA Taylor RR 2003 Immunology Handbook of Chronic Fatigues John Wiley & Sons Hoboken 124 151

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Authors
Broderick, G., Fuite, J., Kreitz, A., Vernon, S. D., Klimas, N., & Fletcher, M. A.
Affiliations
  • University of Alberta (CA)
  • Solve ME/CFS Initiative (US)
  • Veterans Health Administration (US)
  • University of Miami (US)
Corresponding author
Broderick, Gordon
Venue
Brain Behavior and Immunity
Publisher
Elsevier BV
Published
2010-10
Volume
24
Issue
7
Pages
1209-1217
ISSN
0889-1591 (ISSN-L)
OpenAlex
W1981982266
Cited by
202
References
83
Citations by year
2026: 1 · 2025: 7 · 2024: 5 · 2023: 8 · 2022: 10 · 2021: 20 · 2020: 11 · 2019: 20 · 2018: 9 · 2017: 9 · 2016: 12 · 2015: 22 · 2014: 13 · 2013: 16 · 2012: 18
FWCI
12.00
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior and Immunity (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • NSUWorks (Nova Southeastern University) (submittedVersion)
Funders
  • National Institute on Alcohol Abuse and Alcoholism (R21AA016636, R21AA016635)
  • National Institute of Allergy and Infectious Diseases (R01AI065723)
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 › Cognitive Neuroscience › Functional Brain Connectivity Studies
Keywords
chronic fatigue syndrome, immune dysregulation, Th2 immune response, IL-12, lymphotoxin, viral latency, network topology, network hubs, interleukin-2, interferon-gamma, TNF-α
MeSH terms
Adult, Female, Humans, Interferon-gamma, Interleukins, Killer Cells, Natural, Lymphotoxin-alpha, Middle Aged, Tumor Necrosis Factor-alpha, Signal Transduction, Biomarkers, Fatigue Syndrome, Chronic, Case-Control Studies, Cytokines, Th1 Cells, Models, Immunological, Th17 Cells

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