An IgM-mediated immune response directed against nitro-bovine serum albumin (nitro-BSA) in chronic fatigue syndrome (CFS) and major depression: evidence that nitrosative stress is another factor underpinning the comorbidity between major depression and CFS. — CFSMEATLAS
An IgM-mediated immune response directed against nitro-bovine serum albumin (nitro-BSA) in chronic fatigue syndrome (CFS) and major depression: evidence that nitrosative stress is another factor underpinning the comorbidity between major depression and CFS.
Maes, Michael, Mihaylova, Ivana, Kubera, Marta et al. · Neuro endocrinology letters · 2008
Quick Summary
This study looked for signs of damage from harmful molecules called nitrosative stress in people with ME/CFS and depression. Researchers found that people with ME/CFS and depression had higher levels of immune antibodies (IgM) attacking damaged proteins, suggesting their bodies are being harmed by these harmful molecules more than healthy people. The study also found a connection between this damage and leaky gut, where bacteria products leak through the intestinal barrier.
Why It Matters
This study provides biological evidence that ME/CFS and depression share a common underlying mechanism involving cellular damage from harmful molecules, rather than being separate conditions. If validated, identifying and treating nitrosative stress could offer a new therapeutic target benefiting patients with both conditions, and may help explain why these illnesses often occur together.
Observed Findings
Serum IgM antibodies against nitro-BSA were significantly elevated in CFS, partial CFS, and MDD patients compared to healthy controls, with highest levels in full CFS.
A strong positive correlation existed between anti-nitro-BSA IgM levels and symptoms of muscle pain and tension on the FibroFatigue scale.
A strong positive correlation was found between anti-nitro-BSA IgM titers and markers of increased gut permeability (serum IgM and IgA against gram-negative bacterial lipopolysaccharides).
Both CFS and MDD groups showed evidence of nitrosative damage to proteins and related immune activation.
Inferred Conclusions
Both CFS and MDD are accompanied by increased intestinal permeability that allows bacterial products and proteins like BSA to enter circulation.
Nitrosative stress damages these circulating proteins, creating new immune targets (neoepitopes) that the body mounts an IgM antibody response against.
Nitrosative stress is a shared pathogenic mechanism contributing to the overlap and comorbidity between CFS and MDD.
The correlation between anti-nitro-BSA IgM and symptoms suggests this immune response may be relevant to disease manifestations.
Remaining Questions
Does the IgM response against nitro-BSA actually contribute to disease pathology, or is it merely a marker of damage?
What This Study Does Not Prove
This study does not prove that nitrosative stress causes ME/CFS or depression—it only shows an association. The cross-sectional design means we cannot determine whether the immune response is a cause or consequence of illness. The small sample size and lack of longitudinal follow-up limit the ability to generalize findings or establish temporal relationships.
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 →