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Complement receptors in pathological human renal glomeruli.

R Matre, B M Iversen, S Thunold

    Scandinavian Journal of Immunology
    |January 1, 1978
    PubMed
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    Glomerular complement receptors (GCR) bind complement-containing complexes in the kidneys. Reduced GCR activity was observed in kidney biopsies with immunoglobulin and C3 deposits, suggesting a role in kidney disease pathogenesis.

    Area of Science:

    • Nephrology
    • Immunology
    • Pathology

    Background:

    • Glomerular complement receptors (GCR) are involved in immune complex processing within the kidneys.
    • Understanding GCR function is crucial for diagnosing and treating kidney diseases characterized by immune deposits.

    Purpose of the Study:

    • To investigate the localization and activity of glomerular complement receptors (GCR) in human kidney tissue.
    • To determine the relationship between GCR activity and the presence of immune deposits in various kidney conditions.

    Main Methods:

    • Demonstration of GCR by adsorbing C3-coated sheep erythrocytes to human kidney cryostat sections.
    • Immunofluorescence and haemadsorption tests on the same tissue sections to correlate C3 deposits with GCR activity.
    • Evaluation of GCR activity in normal, diseased (with in vivo deposits), and sclerotic glomeruli.

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    Main Results:

    • GCR activity was reduced in glomeruli with in vivo immunoglobulin and C3 deposition along capillary walls.
    • Reduced GCR activity was observed in most biopsies with mesangial deposits (14/19), while five showed normal activity.
    • C3 deposits corresponded to areas of reduced complement receptor activity, with normal adsorption occurring in areas without C3.
    • Sclerotic glomeruli exhibited no GCR activity.

    Conclusions:

    • Glomerular complement receptors (GCR) are localized to the epithelium and play a role in binding complement-containing complexes.
    • Reduced GCR activity is associated with the presence of immune deposits in glomeruli, indicating their involvement in kidney pathology.
    • GCR function may be impaired in conditions leading to glomerular damage and sclerosis.