E2 ModeratePreliminaryPEM not requiredCross-SectionalPeer-reviewedMachine draft
Reduction of Glucocorticoid Receptor Function in Chronic Fatigue Syndrome.
Lynn, Megan, Maclachlan, Laura, Finkelmeyer, Andreas et al. · Mediators of inflammation · 2018 · DOI
Quick Summary
This study looked at how the body's stress hormone system (glucocorticoid receptor) works in ME/CFS patients compared to healthy people. Researchers took blood samples and tested how well a stress hormone called dexamethasone could reduce inflammation markers. They found that ME/CFS patients had some differences in how their immune system responded, but the stress hormone system itself seemed to work similarly to healthy controls.
Why It Matters
This study investigates a proposed mechanism (stress hormone dysregulation) that could explain some ME/CFS symptoms like immune dysfunction and fatigue. Understanding whether the glucocorticoid system is truly dysfunctional in ME/CFS versus other factors is important for developing targeted treatments and distinguishing ME/CFS from other conditions.
Observed Findings
- CFS patients had reduced LPS-induced IL-6 and TNF-α production compared to both control groups.
- CFS patients showed reduced suppression of TNF-α in response to high-dose dexamethasone compared to healthy controls.
- Cortisol levels before and after dexamethasone administration did not differ significantly between CFS patients and healthy controls.
- Cortisol levels were more variable in CFS patients than in healthy controls.
- Childhood adversity scores negatively correlated with ex vivo glucocorticoid receptor function in the combined group.
Inferred Conclusions
- Glucocorticoid receptor dysregulation does not appear to be a primary aetiological factor in CFS based on cortisol and immune suppression data.
- Childhood trauma and comorbid depression are important confounding variables in endocrine studies of CFS that may obscure true biological relationships.
- Immune abnormalities in CFS (reduced baseline cytokine production and impaired dexamethasone response) exist independent of major glucocorticoid signalling defects.
Remaining Questions
- How does childhood adversity mechanistically influence the observed immune and endocrine findings in ME/CFS?
- Are the immune abnormalities in CFS driven by factors other than glucocorticoid receptor dysfunction?
What This Study Does Not Prove
This study does not prove that glucocorticoid receptor dysregulation causes ME/CFS, nor does it establish that stress hormone abnormalities are a primary driver of the illness. The cross-sectional design cannot determine causality, and the confounding influence of childhood trauma and depression limits conclusions about the direct role of GR function in ME/CFS pathogenesis.
Tags
Symptom:Fatigue
Biomarker:CytokinesBlood Biomarker
Method Flag:PEM Not DefinedSmall SampleExploratory Only
Metadata
- DOI
- 10.1155/2018/3972104
- PMID
- 29983634
- Review status
- Machine draft
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 8 April 2026
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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