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The classical pathway triggers pathogenic complement activation in membranous nephropathy.

Larissa Seifert1,2, Gunther Zahner1,2, Catherine Meyer-Schwesinger2,3

  • 1III. Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.

Nature Communications
|January 28, 2023
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Summary
This summary is machine-generated.

Membranous nephropathy (MN) involves complement activation, primarily through the classical pathway. Targeting complement component C3 shows promise for treating this autoimmune kidney disease.

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Area of Science:

  • Nephrology
  • Immunology
  • Autoimmune Diseases

Background:

  • Membranous nephropathy (MN) is an antibody-mediated autoimmune kidney disease.
  • The initiation pathways and pathogenic role of complement activation in MN are not well understood.

Purpose of the Study:

  • To investigate the complement pathways involved in MN pathogenesis.
  • To assess the therapeutic potential of targeting complement in MN.

Main Methods:

  • Analysis of renal biopsies from MN patients for complement components.
  • Proximity ligation assays to visualize complement assembly.
  • Utilizing an antigen-specific autoimmune mouse model of MN.
  • Complement component C3 silencing using RNA interference.

Main Results:

  • All three complement pathways (alternative, classical, lectin) are present in MN renal biopsies.
  • Classical pathway activation is dominant, correlating with C1q-binding IgG subclasses.
  • Complement-deficient mice exhibit reduced glomerular damage and proteinuria.
  • C3 silencing significantly attenuates disease progression in a mouse model.

Conclusions:

  • Complement is primarily activated via the classical pathway in MN.
  • Targeting complement component C3 presents a potential therapeutic strategy for MN.