E2 ModeratePreliminaryPEM ?Cross-SectionalPeer-reviewedMachine draft
Anticardiolipin antibodies in the sera of patients with diagnosed chronic fatigue syndrome.
Hokama, Yoshitsugi, Campora, Cara Empey, Hara, Cynthia et al. · Journal of clinical laboratory analysis · 2009 · DOI
Quick Summary
Researchers tested blood samples from ME/CFS patients and found abnormal antibodies called anticardiolipin antibodies (ACAs) in 95% of the samples. These antibodies mistakenly attack cardiolipin, a substance found in cell membranes. The study suggests that something in the immune system may be going wrong in ME/CFS, possibly affecting how cells produce energy.
Why It Matters
Discovering immune markers like anticardiolipin antibodies in ME/CFS patients could help explain the biological basis of the disease and may eventually support earlier or more accurate diagnosis. If confirmed in larger studies with controls, this finding could open new research directions into autoimmune and metabolic mechanisms in ME/CFS.
Observed Findings
- Anticardiolipin antibodies (IgM isotype) were detected in 95% of ME/CFS patient serum samples
- Immunoglobulin G isotypes were also detected in a subset of samples
- Immunoglobulin A isotypes were detected in a subset of samples
- Enzyme-linked immunoassay procedure was used to identify and measure the antibodies
Inferred Conclusions
- Anticardiolipin antibodies are present at high frequency in ME/CFS patient sera
- Mitochondrial membrane alterations and/or metabolic dysfunction may be involved in ACA expression in ME/CFS
- Future research should investigate the relationship between ACAs and mitochondrial function in this population
Remaining Questions
- Do anticardiolipin antibodies appear at similar frequencies in healthy control populations and other disease states?
- Do these antibodies have a functional role in ME/CFS pathology, or are they merely a biomarker of immune dysregulation?
- What specific mitochondrial membrane alterations or metabolic changes correlate with ACA presence in ME/CFS patients?
- Do ACA levels correlate with disease severity or symptom progression?
What This Study Does Not Prove
This study does not prove that anticardiolipin antibodies cause ME/CFS or that they are responsible for the illness. The study lacks a control group (healthy individuals or other patient populations), so we cannot determine whether these antibodies are specific to ME/CFS or are also present in other conditions. The finding is correlational, not causal.
Tags
Symptom:Fatigue
Biomarker:AutoantibodiesBlood Biomarker
Method Flag:Weak Case DefinitionNo ControlsExploratory Only
Metadata
- DOI
- 10.1002/jcla.20325
- PMID
- 19623655
- Review status
- Machine draft
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 8 April 2026