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Related Experiment Videos

Overlapping IgA and membranous nephropathy.

J C Jennette, W J Newman, J A Diaz-Buxo

    American Journal of Clinical Pathology
    |July 1, 1987
    PubMed
    Summary
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    This study reports on three US patients with overlapping IgA nephropathy and membranous nephropathy, characterized by hematuria and significant proteinuria. Renal biopsies revealed distinct glomerular lesions and immune deposits, suggesting a potential shared pathogenic mechanism.

    Area of Science:

    • Nephrology
    • Immunopathology
    • Glomerular Diseases

    Background:

    • IgA nephropathy (IgAN) and membranous nephropathy (MN) are distinct glomerular diseases.
    • Overlapping features of IgAN and MN are rarely reported, with only four cases previously documented in Japan.

    Observation:

    • This report details three patients from the United States exhibiting concurrent IgA nephropathy and membranous nephropathy.
    • All patients presented with hematuria and nephrotic-range proteinuria.
    • Renal biopsies showed characteristic glomerular lesions, including mesangial and subepithelial electron-dense deposits, with specific IgA and IgG immunostaining patterns.

    Findings:

    • Biopsies revealed focal proliferative glomerular lesions.
    • Distinct immunofluorescence findings included intense mesangial IgA staining and extensive granular capillary wall IgG staining.

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  • Electron microscopy confirmed large mesangial and numerous subepithelial electron-dense deposits.

    • Implications:

    • The findings suggest a possible shared or coexisting pathogenic pathway for IgAN and MN in some individuals.
    • Further research is warranted to elucidate the underlying mechanisms of these overlapping glomerular diseases.
    • Understanding these overlaps may lead to improved diagnostic and therapeutic strategies for patients with complex kidney conditions.