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Systematic Multi-Level Analyses Decode the Arthritis-Neurodegeneration Axis With In Vivo Validation
Jinwen Wang1, Wenhui Xie2, Lei Yang3
1Department of Orthopedics, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 5, 2026
Summary
Arthritis, including osteoarthritis and rheumatoid arthritis, increases neurodegenerative disease risk. The study identifies RNF40 as a potential mediator, highlighting complex joint-brain connections in disease development.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- The relationship between arthritis and neurodegenerative diseases is complex and not fully understood.
- Investigating the directionality and potential mediators of this association is crucial for understanding disease mechanisms.
Purpose of the Study:
- To investigate the links between osteoarthritis (OA) and rheumatoid arthritis (RA) with five neurodegenerative outcomes.
- To identify potential biological mediators connecting arthritis and neurodegeneration.
Main Methods:
- Population survival analysis using UK Biobank data.
- Mendelian randomization to assess genetic links and causality.
- Transcriptomic mapping and colocalization analyses.
- Mouse models of arthritis and Parkinson's disease.
Main Results:
- Osteoarthritis is associated with increased risks of Alzheimer's disease, Parkinson's disease, and autonomic nervous system disorders.
- Rheumatoid arthritis is linked to a higher risk of Alzheimer's disease.
- Mendelian randomization suggests a protective genetic effect of RA on PD, with no evidence of reverse causation.
- Shared genes between RA and PD were identified, prioritizing Ring Finger Protein 40 (RNF40).
- Mouse models showed that arthritis can attenuate dopaminergic injury, and RNF40 plays a context-dependent role in arthritis and Parkinsonian pathology.
Conclusions:
- Arthritis types are associated with increased risks for specific neurodegenerative diseases.
- RNF40 is a potential mediator in the arthritis-neurodegeneration pathway, with context-dependent effects.
- This study provides insights into the shared biological pathways linking inflammatory arthritis and neurodegenerative vulnerability.