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Neoantigens in osteoarthritic cartilage
Tomohiro Kato1, Yang Xiang, Hiroshi Nakamura
1Institute of Medical Science, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan. t3kato@marianna-u.ac.jp
Current Opinion in Rheumatology
|August 18, 2004
Summary
Osteoarthritis involves immune responses, with specific autoantigens potentially driving inflammation and cartilage damage. Autoimmunity in osteoarthritis may also alter the function of joint molecules.
Area of Science:
- Immunology
- Rheumatology
- Pathophysiology
Background:
- Osteoarthritis (OA) was traditionally viewed as degenerative, but immunologic mechanisms are increasingly recognized.
- Synovial inflammation and the pro-inflammatory cytokine interleukin-1 (IL-1) play significant roles in OA pathophysiology.
- Immune responses in OA suggest the involvement of specific driving antigens.
Purpose of the Study:
- To review and discuss autoantigens implicated in osteoarthritis.
- To explore the role of these autoantigens in triggering and perpetuating synovitis and cartilage destruction.
- To highlight the immunologic underpinnings of osteoarthritis.
Main Methods:
- Literature review of studies on autoantigens in osteoarthritis.
- Analysis of proteomic data comparing osteoarthritis and rheumatoid arthritis.
- Examination of experimental models investigating the effects of autoantigens.
Main Results:
- Several autoantigens and autoantibodies, including cartilage intermediate layer protein, have been identified in osteoarthritis.
- Proteomic studies show comparable numbers of autoantigens in osteoarthritis and rheumatoid arthritis, with some specific to osteoarthritis.
- Immunization with cartilage intermediate layer protein in mice led to tendon calcification, suggesting autoimmunity modulates molecular functions.
Conclusions:
- Osteoarthritis-specific autoantigens may drive chronic synovitis, cytokine production, and protease activity, leading to chondrocyte and cartilage damage.
- Autoimmunity can contribute to joint component damage by altering the functions of target molecules.
- These findings underscore the importance of immunologic factors in osteoarthritis pathogenesis.