Study Links Rheumatoid Arthritis to Accelerated Brain Aging
A new preprint study combining brain MRI, blood biomarkers, and immune cell gene expression found that rheumatoid arthritis (RA) patients show structural brain changes consistent with aging approximately 6.5 years beyond their actual age. The research drew on two independent patient cohorts from Gothenburg (n=71) and Glasgow (n=50), comparing them against healthy controls using a validated brain-age prediction model. The findings suggest that chronic systemic inflammation in RA may drive neurodegeneration, raising questions about long-term cognitive and neurological risk in this patient population.
Researchers used structural MRI, circulating neurodegeneration biomarkers, and peripheral monocyte transcriptomics to assess whether rheumatoid arthritis accelerates brain aging across two independent cohorts. Applying a brain-age prediction model trained on healthy individuals from the IXI imaging dataset, they found RA patients had a corrected brain-age gap of +6.5 years (95% CI: 4.2–8.8 years, p < 0.0001) compared to healthy controls. The effect was substantially stronger in patients over 60, who also showed ventricular enlargement and reduced frontal and parietal lobe volumes. Blood levels of brain-derived tau and glial fibrillary acidic protein (GFAP)—established markers of neuronal and glial injury—were elevated in RA patients. The accelerated brain-age gap was further associated with altered transcriptional signatures in myeloid immune cells, pointing to a potential mechanistic link between peripheral inflammation and central nervous system aging. The study is notable for replicating findings across two geographically distinct cohorts, strengthening the internal consistency of the results. As a preprint posted to bioRxiv, the work has not yet undergone formal peer review.
What's missing
The study does not report whether RA disease duration, severity, or treatment type (e.g., biologics, DMARDs) modulate the brain-age gap, which are important clinical confounders. It is also unclear whether the accelerated brain aging translates into measurable cognitive decline or dementia risk in these patients. As a preprint, the findings have not yet been peer-reviewed. The cross-sectional design prevents causal inference about whether RA causes accelerated brain aging or whether shared underlying factors explain the association.
What different sources said
- bioRxivCenter
Neurostructural and molecular evidence of advanced brain aging in rheumatoid arthritis
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