Oxidative and Nitrosative Stress and Immune-Inflammatory Pathways in Patients with Myalgic Encephalomyelitis (ME)/Chronic Fatigue Syndrome (CFS). — CFSMEATLAS
Oxidative and Nitrosative Stress and Immune-Inflammatory Pathways in Patients with Myalgic Encephalomyelitis (ME)/Chronic Fatigue Syndrome (CFS).
Morris, Gerwyn, Maes, Michael · Current neuropharmacology · 2014 · DOI
Quick Summary
This study proposes that ME/CFS involves a harmful cycle where the body's immune system becomes overactive and produces damaging molecules called oxidative stress. These problems can be triggered by infections, gut bacteria leaking into the bloodstream, or problems with the energy-producing parts of cells called mitochondria. Once started, this cycle feeds on itself, causing brain inflammation, reduced blood flow to the brain, and damage to cells throughout the body.
Why It Matters
Understanding that ME/CFS may involve interconnected cycles of immune activation and oxidative damage could explain why the condition is so persistent and multifaceted. This framework suggests that breaking these cycles—through targeting infections, reducing oxidative stress, or modulating immune function—might be therapeutic approaches worth investigating.
Observed Findings
Patients with ME/CFS show evidence of elevated oxidative and nitrosative stress markers
Multiple potential sources of chronic immune activation exist in ME/CFS including infections and mitochondrial dysfunction
The condition is associated with neuroinflammation and reduced brain blood flow/metabolism
Oxidative damage to lipids and DNA has been documented in ME/CFS patients
Signatures of secondary autoimmune responses directed against damaged cellular components are present
Inferred Conclusions
Chronic oxidative and nitrosative stress combined with immune-inflammatory activation may be central to ME/CFS pathogenesis
Multiple triggers can initiate self-sustaining pathological cycles that perpetuate the disease
These interconnected mechanisms may explain the complexity and persistence of symptoms
Breaking these cycles at multiple points might be necessary for therapeutic benefit
Remaining Questions
Which triggering factors are primary versus secondary, and do they differ between ME/CFS patients?
Can interventions targeting oxidative stress or immune activation reverse the self-perpetuating cycles?
What This Study Does Not Prove
This is a theoretical review that synthesizes existing knowledge rather than presenting new experimental results, so it does not provide direct empirical proof of causation. The study does not establish which triggering factors are primary versus secondary, or whether O&NS and immune activation are causes or consequences of ME/CFS. It also does not demonstrate that targeting these pathways will effectively treat the disease.
Why do these pathological cycles persist chronically in ME/CFS when the immune system typically resolves acute threats?
Are there biomarkers that can reliably measure the activity of these O&NS and immune-inflammatory pathways to track disease progression and treatment response?