E2 ModeratePreliminaryPEM unclearMechanisticPeer-reviewedReviewed
Evidence of mitochondrial dysfunction and impaired redox signalling in a subgroup of patients with myalgic encephalomyelitis/chronic fatigue syndrome
Cara Tomas, Jessica Newton, Stuart Watson · The EPMA Journal · 2017 · DOI
Quick Summary
This UK study analyzed mitochondrial function in immune cells from ME/CFS patients using the Seahorse assay. They found reduced ATP production capacity, impaired electron transport chain function, and altered redox signaling in a subgroup of ME/CFS patients compared to healthy controls.
Why It Matters
Direct measurement of mitochondrial function in ME/CFS cells provides mechanistic support for the metabolic dysfunction hypothesis. It extends the Naviaux metabolomics findings by showing impaired energy production at the cellular level.
Observed Findings
- Reduced ATP production capacity in immune cells from ME/CFS subgroup
- Impaired electron transport chain function detected via Seahorse assay
- Altered redox signaling in affected patients compared to healthy controls
- Mitochondrial dysfunction present in subgroup only, not all ME/CFS patients
Inferred Conclusions
- Mitochondrial dysfunction occurs in a subset of ME/CFS patients and may contribute to energy metabolism impairment
- Redox signaling alterations suggest oxidative stress or metabolic imbalance in affected individuals
Remaining Questions
- Is mitochondrial dysfunction a primary pathogenic mechanism or secondary consequence of other biological processes in ME/CFS?
- What distinguishes the ME/CFS subgroup with mitochondrial impairment from those without detectable dysfunction?
- Do mitochondrial deficits correlate with specific ME/CFS symptoms or disease severity?
What This Study Does Not Prove
This small study identified mitochondrial dysfunction in a subgroup only. It is unknown whether mitochondrial impairment is a primary feature or secondary to other biological processes in ME/CFS.
Tags
Method Flag:PEM_UNCLEARSmall SampleEXPLORATORYBIOLOGICALLY_RELEVANTWeak Case DefinitionExploratory Only
Symptom:Fatigue
Biomarker:MetabolomicsBlood Biomarker
Metadata
- DOI
- 10.1007/s13167-017-0088-2
- Sample size
- 25 patients
- Control group
- Yes
- Review status
- Editor reviewed
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 7 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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