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Immunologic studies in IgA nephropathy

A J Woodroffe, A A Gormly, P E McKenzie

    Kidney International
    |September 1, 1980
    PubMed
    Summary
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    Circulating immune complexes (CIC) were found in over 40% of IgA nephropathy patients, often coinciding with hematuria. These immune complexes may be triggered by common environmental antigens, suggesting new insights into IgA nephropathy pathogenesis.

    Area of Science:

    • Nephrology
    • Immunology
    • Pathogenesis of Kidney Disease

    Background:

    • Primary IgA nephropathy is a common cause of glomerulonephritis.
    • The role of immune complexes in IgA nephropathy pathogenesis is not fully understood.
    • Previous studies have suggested a link between immune complex deposition and disease activity.

    Purpose of the Study:

    • To investigate the presence and characteristics of circulating immune complexes (CIC) in patients with primary IgA nephropathy.
    • To explore the potential correlation between CIC, clinical manifestations (e.g., hematuria), and serum IgA levels.
    • To identify potential antigens involved in the formation of CIC in IgA nephropathy.

    Main Methods:

    • Solid-phase Clq radioimmunoassay used to detect CIC in 78 patients with primary IgA nephropathy.

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  • Characterization of CIC size and immunoglobulin composition (IgA, IgG, IgM).
  • Correlation analysis between CIC detection, macroscopic hematuria, and serum IgA concentrations.

    • Main Results:

    • Circulating immune complexes (CIC) were detected in 43.6% of patients.
    • Intermediate-sized CIC (9-17S) containing IgA and IgG were identified.
    • CIC presence correlated with episodes of macroscopic hematuria but not with elevated serum IgA levels.
    • Similar CIC findings were observed in Henoch Schonlein purpura and IgA glomerulonephritis associated with liver disease.
    • Elevated antibody titers to exogenous antigens (respiratory pathogens, gut flora, BSA) suggest their involvement.

    Conclusions:

    • Circulating immune complexes are frequently present in primary IgA nephropathy and correlate with hematuria.
    • Exogenous antigens, possibly from respiratory or gut flora, may play a role in CIC formation and IgA nephropathy pathogenesis.
    • Defects in mucosal antigen exclusion or reticuloendothelial system function are proposed mechanisms for CIC deposition.