Phenotypic characteristics of peripheral immune cells of Myalgic encephalomyelitis/chronic fatigue syndrome via transmission electron microscopy: A pilot study. — CFSMEATLAS
Phenotypic characteristics of peripheral immune cells of Myalgic encephalomyelitis/chronic fatigue syndrome via transmission electron microscopy: A pilot study.
Jahanbani, Fereshteh, Maynard, Rajan D, Sing, Justin Cyril et al. · PloS one · 2022 · DOI
Quick Summary
Researchers used a powerful microscope to examine immune cells from people with ME/CFS and found several abnormalities. They observed that immune cells from ME/CFS patients died more frequently when activated, had swollen energy-producing structures (mitochondria), and in one severely ill patient, contained unusual fat-like accumulations. These cellular changes suggest that ME/CFS involves real, measurable damage to immune system function.
Why It Matters
This study provides direct ultrastructural evidence of immune cell dysfunction in ME/CFS, potentially explaining why patients have impaired immune responses and post-exertional symptom worsening. The findings suggest ME/CFS involves measurable cellular pathology rather than being purely functional, which may inform future diagnostic tests and therapeutic targets.
Observed Findings
T cells from ME/CFS patients showed over 2-fold increase in apoptotic and necrotic cell death after stimulation
Stimulated T cells from ME/CFS patients demonstrated higher frequency of swollen mitochondria
The extremely severe ME/CFS patient's stimulated PBMCs contained large intracellular giant lipid droplet-like organelles
Stimulated cells from ME/CFS patients showed slight increase in platelet aggregation
Cellular abnormalities were present in unstimulated and particularly pronounced in stimulated cells
Inferred Conclusions
ME/CFS involves extensive morphological alterations in immune cell ultrastructure and mitochondrial phenotype
Increased T cell death in response to activation may contribute to immune dysfunction in ME/CFS
Mitochondrial abnormalities and possible lipid storage disorders may represent pathogenic mechanisms in ME/CFS
Platelet activity may play a role in ME/CFS pathophysiology and potentially correlate with disease severity
Remaining Questions
Are the observed cellular abnormalities present in all ME/CFS patients or only in specific subgroups, and do they correlate with disease severity?
What This Study Does Not Prove
This pilot study cannot establish whether the observed cellular abnormalities cause ME/CFS symptoms or result from the disease. The very small sample size and lack of age/sex-matched controls for all conditions limit generalizability. The findings are descriptive morphology and do not prove a specific disease mechanism or identify therapeutic interventions.