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Rheumatoid factors: host resistance or autoimmunity?
1Department of Medicine, The McGill University Hospital Centre, The Montreal General Hospital, Montreal, Quebec, Canada.
Clinical Immunology (Orlando, Fla.)
|July 26, 2002
Summary
Rheumatoid factors (RFs) are autoantibodies crucial for immune defense against pathogens. While typically transient, sustained RF levels are linked to autoimmune diseases, highlighting a complex balance in host defense.
Area of Science:
- Immunology
- Autoimmunity
- Infectious Disease Immunology
Background:
- Rheumatoid factors (RFs) are autoantibodies targeting IgG, present in circulation of healthy individuals and patients with autoimmune conditions.
- High RF levels are associated with rheumatoid arthritis, Sjogren's syndrome, and hepatitis C-related cryoglobulinemia.
- RFs are typically induced by infections as a secondary immune response, but usually resolve.
Purpose of the Study:
- To review the literature on the origin, structure, binding specificities, and roles of RFs in disease.
- To discuss the dual role of RFs in host defense and potential contribution to autoimmune responses.
- To consider the balance between host defense and autoimmunity in the context of RFs.
Main Methods:
- Literature review of research on rheumatoid factors.
- Analysis of RFs' role in immune response, host defense, and disease pathogenesis.
- Discussion of RFs' origin, structure, and binding specificities.
Main Results:
- RF-committed B-cells are frequent in circulation.
- RFs contribute to pathogen defense via antigen presentation and immune complex clearance.
- Sustained RFs are implicated in chronic autoimmune conditions.
Conclusions:
- RFs play a significant role in host defense against infections.
- The persistence of RFs may contribute to autoimmune diseases.
- Understanding the RFs' role requires balancing host defense mechanisms with autoimmune risks.