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Related Experiment Video

Updated: Aug 2, 2025

Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
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Proteomic Analysis of Complement Proteins in Glomerular Diseases.

Sanjeev Sethi1, Lilian Monteiro P Palma2, Jason D Theis1

  • 1Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA.

Kidney International Reports
|April 18, 2023
PubMed
Summary

Complement activation drives glomerulonephritis (GN) progression. This study identified specific complement proteins and pathways in various GN types, revealing distinct patterns that could inform targeted therapies for kidney disease.

Keywords:
complementglomerulonephritiskidneylaser microdissectionmass spectrometry

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Area of Science:

  • Nephrology
  • Immunology
  • Proteomics

Background:

  • Complement activation is crucial in glomerulonephritis (GN) pathogenesis, leading to glomerular injury.
  • Routine kidney biopsy evaluation of complement pathways is limited, typically only assessing C3c and C1q.
  • Understanding specific complement involvement is key to deciphering GN progression.

Purpose of the Study:

  • To analyze complement proteins and pathways involved in GN pathogenesis using advanced techniques.
  • To identify specific complement deposition patterns across different types of GN.
  • To explore potential therapeutic targets within the complement system for GN treatment.

Main Methods:

  • Laser microdissection of glomeruli.
  • Mass spectrometry-based proteomic analysis of complement components.
  • Differential analysis of complement protein deposition in various GN subtypes.

Main Results:

  • C3 and C9 were the most abundant complement proteins, indicating activation of classical, lectin, alternative, and/or terminal pathways.
  • Specific C4A or C4B dominance was observed in different GN types, including membranous nephropathy, lupus nephritis, and monoclonal Ig deposition disease.
  • Significant deposition of complement regulatory proteins, Factor H-related protein-1 (FHR-1) and Factor H-related protein-5 (FHR-5), was detected in most GN cases.

Conclusions:

  • Glomerulonephritis exhibits variable complement pathway activation, protein deposition, and specific protein accumulation.
  • The identified complement profiles offer insights into the pathogenesis of distinct GN subtypes.
  • Targeting specific complement pathways presents a promising therapeutic strategy for managing GN.