The many roads to mitochondrial dysfunction in neuroimmune and neuropsychiatric disorders.
Morris, Gerwyn, Berk, Michael · BMC medicine · 2015 · DOI
Quick Summary
This paper examines how mitochondria—the energy-producing parts of our cells—can become damaged in several conditions including ME/CFS. The authors found that while the specific causes may differ between patients, most people with these conditions share a common problem: their bodies produce too many harmful molecules called reactive oxygen species, which damage cells and trigger inflammation. This damage to mitochondria may explain why patients struggle with energy production and fatigue.
Why It Matters
This study is important because it identifies chronic oxidative stress and inflammation as potential common mechanisms underlying mitochondrial dysfunction in ME/CFS, even though the disease may have multiple entry points. Understanding these shared pathological pathways could guide development of targeted treatments and help explain the exercise intolerance and post-exertional malaise characteristic of ME/CFS.
Observed Findings
Chronic oxidative stress (elevated reactive oxygen and nitrogen species and/or reduced glutathione) is present in study cohorts across multiple diagnoses including ME/CFS.
Chronic systemic inflammation with elevated pro-inflammatory cytokines co-occurs with oxidative stress in these conditions.
Mitochondrial dysfunction and impaired ATP production are characteristic of many chronic illnesses not classified as primary mitochondrial diseases.
Findings of mitochondrial dysfunction in ME/CFS are less consistent than in MS, suggesting diagnostic heterogeneity.
Inferred Conclusions
Oxidative stress and pro-inflammatory cytokines appear to work together through specific molecular mechanisms to damage mitochondria and impair energy production.
While primary causes may differ between individuals with ME/CFS, converging pathways involving oxidative stress represent a common mechanism of mitochondrial dysfunction.
What determines which patients with ME/CFS develop mitochondrial dysfunction versus those without evidence of this abnormality?
Are oxidative stress and inflammation the primary cause of mitochondrial damage, or do they represent secondary responses to an underlying trigger?
What This Study Does Not Prove
This review does not establish whether oxidative stress and inflammation are primary causes of mitochondrial dysfunction or secondary consequences of the disease process. It also does not prove that all ME/CFS patients have mitochondrial dysfunction—the abstract notes findings are 'less consistent' in ME/CFS compared to conditions like MS, suggesting heterogeneity in the patient population. The paper cannot determine whether correcting oxidative stress would reverse mitochondrial damage or improve clinical outcomes.
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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