Rheumatoid factors: good or bad for you?

Area of Science:

• Immunology
• Autoimmunity

Background:

• Rheumatoid factors (RFs) are autoantibodies linked to rheumatoid arthritis, but also found transiently in healthy individuals.
• RF production by B cells requires dual activation signals: B-cell receptor engagement and pathogen-associated molecular pattern recognition via Toll-like receptors (TLRs).
• These autoantibodies bridge innate and adaptive immune responses.

Purpose of the Study:

• To review current knowledge on RF induction.
• To examine the beneficial or detrimental roles of RFs in healthy individuals and chronic disease.

Main Methods:

• Literature review.
• Examination of current knowledge on RF induction and function.

Main Results:

• Low-affinity, polyreactive IgM RFs likely benefit host defense by aiding immune complex clearance and antigen presentation.
• High-affinity RFs, prevalent in chronic disease, may promote autoantibody production and vasculitis through immune complex deposition.

Conclusions:

• The impact of RFs (beneficial or detrimental) is context-dependent.
• Factors influencing RF effects include RF type, quantity, TLR-perpetuated responses, and stimulation of other immune cells.