Antinuclear antibodies in rheumatic disease: a proposal for a function-based classification

Area of Science:

• Immunology
• Rheumatology
• Autoimmunity

Background:

• Antinuclear antibodies (ANAs) are autoantibodies targeting nuclear components.
• While some ANAs are normal, others indicate rheumatic diseases, aiding diagnosis and prognosis.
• The link between ANAs and specific disease manifestations is often unclear due to ubiquitous intracellular antigen expression.

Purpose of the Study:

• To explore the complex role of ANAs in rheumatic diseases.
• To propose a function-based classification of ANAs.
• To provide a framework for understanding ANA serology and disease associations.

Main Methods:

• Review of existing literature on ANAs in normal individuals and rheumatic diseases.
• Analysis of the role of specific ANAs (e.g., anti-DNA, anti-Sm, anti-HMGB1) in disease pathogenesis and potential protective effects.
• Conceptual development of a function-based classification system for ANAs.

Main Results:

• ANAs have diverse roles, with some promoting disease (e.g., anti-DNA in lupus nephritis) and others potentially offering protection (e.g., anti-HMGB1).
• Specific ANAs can induce immune abnormalities via mechanisms like type I interferon induction.
• A function-based classification can categorize ANAs by their presence in health/disease and their immunomodulatory capacity.

Conclusions:

• A function-based classification of ANAs is proposed to better understand their clinical significance.
• This framework can elucidate serological features and the relationship between ANA expression and disease manifestations in rheumatic diseases.
• Further research is needed to fully integrate this classification into clinical practice.