Brenu, E W, Hardcastle, S L, Atkinson, G M et al. · Auto- immunity highlights · 2013 · DOI
This review examined how natural killer (NK) cells—a type of white blood cell that fights infections and abnormal cells—work differently in ME/CFS patients. The researchers found that people with ME/CFS often have unusual numbers of NK cells or reduced ability to fight infections, which may help explain why patients suffer from persistent symptoms and recurrent infections. Understanding these immune cell problems could eventually lead to better treatments.
NK cell dysfunction represents a measurable biological abnormality in ME/CFS that could objectively validate patient experiences of immune dysfunction and recurrent infections. Identifying specific NK cell defects may enable development of biomarkers for diagnosis, disease stratification by severity, and targeted immunotherapeutic interventions. This work bridges immune science and clinical ME/CFS, providing evidence that symptoms have biological underpinnings rather than psychosomatic origins.
This review does not prove that NK cell dysfunction causes ME/CFS or that correcting NK cell function will cure the disease. As a systematic review synthesizing existing studies, it cannot establish causation, and heterogeneity across studies prevents definitive conclusions about which specific NK abnormalities are primary versus secondary to other disease mechanisms. The findings do not rule out multi-system involvement or the possibility that NK dysfunction is one of several concurrent immune problems.
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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