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Glomerulonephritis and IgA deficiency.

M A French, J R Shortland, R A Coward

    Clinical Nephrology
    |April 1, 1987
    PubMed
    Summary
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    Selective IgA deficiency is linked to a mild glomerulonephritis characterized by IgM deposits. This condition may stem from respiratory infections or dietary factors, warranting further investigation as a distinct entity.

    Area of Science:

    • Nephrology
    • Immunology
    • Pathology

    Background:

    • Selective IgA deficiency is a primary immunodeficiency.
    • Glomerulonephritis can manifest with diverse immunological findings.

    Purpose of the Study:

    • To describe a series of patients with selective IgA deficiency and glomerulonephritis.
    • To investigate the immunological basis of this glomerulonephritis.

    Main Methods:

    • Case series analysis of three patients.
    • Renal biopsy with direct immunofluorescence and immunoperoxidase staining.
    • Serum immune complex assays (polyethylene glycol precipitation).
    • Detection of antibodies (milk precipitins).

    Main Results:

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    • All patients had selective IgA deficiency (<0.05 g/l).
    • Histopathology revealed mesangial proliferative glomerulonephritis with irregular glomerular capillary loop thickening and paramesangial deposits.
    • Immunofluorescence showed glomerular IgM and vascular C3 deposition.
    • Immune complex assays detected IgM and IgG, and one patient had milk precipitins.
    • Recurrent upper respiratory tract infections were noted in all patients.

    Conclusions:

    • Glomerular IgM deposition in these patients is potentially linked to IgA deficiency.
    • The IgM immune complexes might arise from responses to dietary antigens (e.g., bovine proteins) or infections.
    • The observed glomerulonephritis shares features with IgM-associated glomerulonephritis, suggesting a possible distinct clinicopathological entity requiring further study.