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Active Heymann nephritis in complement component C6 deficient rats

P L Leenaerts1, B M Hall, B J Van Damme

  • 1Department of Nephrology, University Hospital Gasthuisberg, University of Leuven, Belgium.

Kidney International
|June 1, 1995
PubMed
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The membrane attack complex (MAC) does not significantly contribute to renal injury in active Heymann nephritis (AHN). Instead, the growth of immune deposits correlates with proteinuria, suggesting secondary damage mechanisms in this autoimmune kidney disease.

Area of Science:

  • Nephrology
  • Immunology
  • Pathology

Background:

  • Active Heymann nephritis (AHN) is an autoimmune kidney disease causing proteinuria.
  • The role of the membrane attack complex (MAC), specifically C5b-9, in AHN pathogenesis was previously unclear.
  • Data suggested MAC involvement, similar to passive Heymann nephritis.

Purpose of the Study:

  • To investigate the role of the membrane attack complex (MAC) in the development of renal injury and proteinuria in active Heymann nephritis (AHN).
  • To determine if complement deficiency impacts the progression of AHN.
  • To explore the relationship between immune deposit size and proteinuria levels.

Main Methods:

  • Induced AHN in complement component C6-deficient rats (unable to form MAC) and normal rats.

Related Experiment Videos

  • Monitored autoantibody titers, proteinuria, and performed renal biopsies with immunofluorescence and electron microscopy.
  • Assessed the effect of exogenous complement administration in deficient rats.

    • Main Results:

    • Both C6-deficient and normal rats developed comparable high titers of anti-Fx1A autoantibodies and similar proteinuria.
    • Renal biopsy findings, including Ig and C3 deposits and subepithelial electron-dense deposits, were identical between groups.
    • No significant difference in disease progression or severity was observed between complement-deficient and normal rats.
    • A strong positive correlation (r=0.94) was found between the size of subepithelial immune deposits and the level of proteinuria.

    Conclusions:

    • The membrane attack complex (MAC) does not play a major role in the pathogenesis of active Heymann nephritis (AHN).
    • The growth and size of immune deposits are strongly associated with proteinuria.
    • Secondary mechanisms, triggered by the expansion of immune deposits, likely damage glomerular permselectivity in AHN.