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Updated: Sep 7, 2025
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Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
Published on: June 8, 2022
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C3 glomerulopathy: Understanding an ultra-rare complement-mediated renal disease
Amanda K Heiderscheit1,2, Jill J Hauer1, Richard J H Smith1,2
1Molecular Otolaryngology and Renal Research Laboratories, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA.
Summary
C3 glomerulopathy (C3G) is a kidney disease marked by C3 complement protein deposits. Understanding its causes, like autoantibodies or genetic mutations, is key for patient care and developing new treatments.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- C3 glomerulopathy (C3G) is defined by dominant C3 complement component deposition in glomeruli.
- Pathophysiology involves alternative complement pathway dysregulation in the fluid phase and kidney.
Purpose of the Study:
- To highlight the clinical features of C3G.
- To emphasize the need for evaluating complement dysregulation drivers.
- To discuss current treatment limitations and future therapeutic directions.
Main Methods:
- Diagnosis via renal biopsy and immunofluorescence microscopy.
- Clinical evaluation for complement dysregulation indices.
- Identification of autoantibodies and genetic mutations.
Main Results:
- C3G shows dominant C3 deposition in glomeruli.
- Autoantibodies against C3/C5 convertases are common drivers.
- Half of patients reach end-stage renal disease within 10 years.
- High recurrence risk post-transplantation.
Conclusions:
- C3G management requires understanding complement dysregulation.
- Current treatments are symptomatic, lacking specificity.
- Emerging anti-complement therapies offer future hope.
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