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A quantitative assay for IgA rheumatoid factor

W J Koopman, R E Schrohenloher, A Solomon

    Journal of Immunological Methods
    |January 1, 1982
    PubMed
    Summary
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    A new radioimmunoassay detects IgA rheumatoid factor (RF) in bodily fluids. Elevated IgA RF levels are found in rheumatoid arthritis patients, correlating with IgM RF.

    Area of Science:

    • Immunology
    • Rheumatology
    • Biochemistry

    Background:

    • Rheumatoid arthritis (RA) is an autoimmune disease characterized by joint inflammation.
    • Rheumatoid factor (RF) is a common autoantibody found in RA patients, primarily IgM RF.
    • The role and detection of IgA RF in RA pathogenesis require further investigation.

    Purpose of the Study:

    • To develop and validate a sensitive assay for quantifying human IgA RF in biological samples.
    • To assess the diagnostic significance of IgA RF in rheumatoid arthritis.
    • To explore the relationship between IgA RF and IgM RF in RA patients.

    Main Methods:

    • Development of a solid-phase radioimmunoassay (RIA) for human IgA RF detection.
    • Assay validation for sensitivity (nanogram quantities) and specificity.

    Related Experiment Videos

  • Measurement of IgA RF concentrations in serum and synovial fluid from RA patients and healthy controls.

    • Main Results:

    • The developed RIA accurately detected nanogram levels of IgA RF in biological fluids.
    • Significantly higher IgA RF concentrations were observed in sero-positive RA patients compared to sero-negative patients and controls.
    • IgA RF levels in paired sera and synovial fluids were comparable in RA patients.
    • A moderate correlation (r = 0.673) was found between IgA RF and IgM RF levels in RA sera, with wide variations in their ratio.

    Conclusions:

    • The developed RIA is a valuable tool for measuring IgA RF in clinical and research settings.
    • Elevated IgA RF is a potential biomarker for rheumatoid arthritis.
    • The variable ratio of IgA RF to IgM RF suggests distinct roles or production sites for these autoantibodies in RA.