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Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
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Comparison of dominant and nondominant C3 deposition in primary glomerulonephritis

Jiwon Ryu1, Eunji Baek1, Hyung-Eun Son1

  • 1Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.

Kidney Research and Clinical Practice
|February 7, 2023
PubMed

Insights

Patients with C3-dominant glomerulonephritis (C3D-GN) show more severe kidney damage and higher mortality than those with nondominant C3 deposition (C3ND-GN). This study highlights key pathological differences in interstitial and mesangial changes between these C3 deposition patterns.

Area of Science:

  • Nephrology
  • Immunology
  • Pathology

Background:

  • Alternative complement pathway dysregulation is implicated in glomerulonephritis (GN).
  • C3 deposition is a common finding in GN, with varying dominance.
  • Distinguishing C3-dominant GN (C3D-GN) from nondominant C3 deposition GN (C3ND-GN) may reveal distinct pathological and clinical features.

Purpose of the Study:

  • To investigate the pathological and clinical differences between primary GN with C3-dominant deposition (C3D-GN) and nondominant C3 deposition (C3ND-GN).

Main Methods:

  • Retrospective analysis of primary GN cases from the Korean GlomeruloNEphritis sTudy (KoGNET).
  • C3D-GN defined by immunofluorescence: C3 staining intensity at least two grades higher than C1q, C4, and immunoglobulins.
  • Permutation testing used for statistical analysis due to significant patient number disparity between groups (31 C3D-GN vs. 9,689 C3ND-GN).

Main Results:

  • C3D-GN patients had higher serum creatinine and a greater prevalence of estimated glomerular filtration rate <60 mL/min/1.72 m2.
  • Interstitial fibrosis and mesangial cellularity were significantly greater in C3D-GN.
  • While serum C3 levels were lower in C3D-GN, progression to end-stage renal disease and all-cause mortality were comparable between groups in this analysis.

Conclusions:

  • C3D-GN is associated with more severe renal injury progression and potentially higher mortality compared to C3ND-GN.
  • Pathological differences, including interstitial and mesangial changes, characterize C3D-GN.
  • Further research is warranted to elucidate the precise mechanisms and long-term outcomes in C3D-GN.
Abstract

Keywords:
Alternative pathwayComplement system C3 convertaseGlomerulonephritis

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