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Related Experiment Videos

A solid-phase, polyclonal IgM-RF binding assay for circulating immune complexes.

G Glikmann, S E Svehag, H Nielsen

    Acta Pathologica Et Microbiologica Scandinavica. Section C, Immunology
    |April 1, 1979
    PubMed
    Summary

    A new assay detects circulating immune complexes (IC) using IgM-RF binding. This method shows significant differences in IC levels in patients with SLE, sarcoidosis, glomerulonephritis, and acute myocardial infarction.

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    Area of Science:

    • Immunology
    • Clinical Chemistry

    Background:

    • Circulating immune complexes (IC) are implicated in various autoimmune and inflammatory diseases.
    • Accurate detection of IC is crucial for diagnosis and monitoring disease activity.

    Purpose of the Study:

    • To describe a novel polyclonal IgM-RF-binding assay (pRF-BA) for detecting circulating immune complexes (IC).
    • To evaluate the assay's sensitivity, variability, and diagnostic utility in patient cohorts.

    Main Methods:

    • The pRF-BA utilizes competitive binding of heat-treated iodinated IgG (deltaIgG) and naturally occurring IC to solid-phase IgM-RF.
    • Assay sensitivity was determined, and coefficient of variation was calculated.
    • One hundred and six patient sera and 30 normal control sera were analyzed for IC occurrence.

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    Main Results:

    • The assay demonstrated a sensitivity limit of 300-400 ng deltaIgG/ml.
    • Significant differences in IC levels were observed between normal controls and patients with SLE, sarcoidosis, and glomerulonephritis (p < 0.01).
    • Approximately 40% of acute myocardial infarction (AMI) patients showed positive IC reactions 5-10 days post-infarction, with kinetics correlating to ASAT enzyme levels.

    Conclusions:

    • The pRF-BA is a sensitive and reproducible method for detecting circulating immune complexes.
    • The assay shows potential for differentiating disease states and monitoring conditions like AMI.
    • Further studies can explore the clinical application of pRF-BA in various pathological conditions.