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Related Experiment Videos

Circulating immune complexes in mixed connective tissue disease.

J T Halla, J E Volanakis, R E Schrohenloher

    Arthritis and Rheumatism
    |May 1, 1979
    PubMed
    Summary
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    This study found that 94% of patients with mixed connective tissue disease have circulating immune complexes. These immune complexes, particularly those detected by the Raji cell radioassay, correlate with disease activity and help distinguish MCTD from other rheumatic conditions.

    Area of Science:

    • Rheumatology
    • Immunology

    Background:

    • Mixed connective tissue disease (MCTD) is an autoimmune disorder.
    • Circulating immune complexes (CICs) are implicated in the pathogenesis of autoimmune diseases.

    Purpose of the Study:

    • To investigate the presence and characteristics of CICs in patients with MCTD.
    • To assess the correlation of CIC levels with disease activity.
    • To differentiate MCTD from other rheumatic diseases based on CIC profiles.

    Main Methods:

    • Sera from MCTD patients were analyzed using three distinct assays: monoclonal rheumatoid factor radioimmunoassay, C1q-binding assay, and Raji cell radioassay.
    • Disease activity was assessed in conjunction with CIC levels.

    Main Results:

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  • Evidence of CICs was detected in 94% of MCTD patients by at least one assay.
  • The Raji cell radioassay identified CICs in 88% of patients, followed by the C1q-binding assay (50%) and monoclonal rheumatoid factor radioimmunoassay (45%).
  • CIC levels, particularly from Raji cell and C1q-binding assays, correlated with disease activity.

    • Conclusions:

    • Circulating immune complexes are prevalent in mixed connective tissue disease.
    • Specific CIC detection methods and their levels offer potential as clinical tools for monitoring disease activity.
    • The CIC reactivity pattern in MCTD is distinct from rheumatoid arthritis, scleroderma, and polymyositis, supporting MCTD's unique status.