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C3 Glomerulopathy.

Magdalena Riedl1,2, Paul Thorner3,4, Christoph Licht5,6,7

  • 1Cell Biology Program of the Research Institute, The Hospital for Sick Children, 555 University Avenue, Toronto, ON, M5G 1X8, Canada.

Pediatric Nephrology (Berlin, Germany)
|April 9, 2016
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Summary
This summary is machine-generated.

Membranoproliferative glomerulonephritis is now classified as C3 glomerulopathy (C3G) or immune complex-GN, based on complement alternative pathway (AP) dysregulation. This advances understanding and treatment for C3G, a rare kidney disease.

Keywords:
C3 GlomerulopathyC3 Nephritic factorComplementDense deposit diseaseEculizumabMembranoproliferative glomerulonephritis

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Area of Science:

  • Nephrology
  • Immunology
  • Complement System Biology

Background:

  • Membranoproliferative glomerulonephritis (MPGN) classification evolved due to new insights into disease mechanisms.
  • Distinguishing between C3 glomerulopathy (C3G) and immune complex-GN (IC-GN) is crucial for understanding MPGN.
  • The complement alternative pathway (AP) plays a central role in the pathogenesis of C3G.

Purpose of the Study:

  • To detail the re-classification of MPGN based on pathomechanisms.
  • To highlight the role of complement AP dysregulation in C3G.
  • To discuss the diagnostic criteria and implications of the new classification.

Main Methods:

  • Review of recent advances in understanding MPGN pathology.
  • Analysis of pathogenetic mechanisms involving the complement alternative pathway.
  • Electron microscopy for differentiating C3G subtypes (C3 glomerulonephritis and dense deposit disease).

Main Results:

  • MPGN re-classified as C3G and IC-GN based on complement AP role.
  • C3G characterized by predominant glomerular C3 deposition due to AP dysregulation.
  • Mutations or autoantibodies affecting AP regulators found in up to 80% of C3G patients.
  • Electron microscopy identifies C3 glomerulonephritis and dense deposit disease within C3G.

Conclusions:

  • The new classification signifies a major advancement in understanding MPGN pathogenesis.
  • Understanding C3G and IC-GN mechanisms opens avenues for targeted therapies.
  • Despite heterogeneous outcomes, 50% of C3G patients progress to end-stage renal disease.