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C3 nephritic factor can be associated with membranous glomerulonephritis
Olivier Niel1, Aymeric Dallocchio, Marie-Christine Thouret
1Inserm U1091, Genetics of Renal Development and Diseases, UNS Université Nice Sophia Antipolis, 28, avenue de Valrose, 06000, Nice, France, o.r.p.niel@free.fr.
Pediatric Nephrology (Berlin, Germany)
|November 15, 2014
Summary
C3 nephritic factor (C3NeF) can occur with membranous glomerulonephritis in children. Early immunosuppressive therapy improves kidney function and blood pressure, though complement abnormalities may persist.
Area of Science:
- Nephrology
- Immunology
- Pediatrics
Background:
- C3 nephritic factor (C3NeF) is an IgG autoantibody targeting the C3 convertase, leading to complement dysregulation.
- C3NeF is typically associated with dense deposit disease and membranoproliferative glomerulonephritis, causing low C3 levels and renal dysfunction.
- Standard treatments for C3NeF-associated kidney disease have variable efficacy and high rates of transplant recurrence.
Observation:
- This study reports C3NeF in two unrelated children with membranous glomerulonephritis (MGN) types 3-4.
- The patients presented with proteinuria, hypertension, and hematuria, common symptoms of glomerulonephritis.
Findings:
- Adequate immunosuppressive therapy significantly reduced proteinuria and normalized blood pressure in these patients.
- Long-term renal function remained stable under treatment, indicating a favorable mid-term outcome.
- Despite clinical improvement, underlying complement anomalies associated with C3NeF persisted for several years.
Implications:
- C3NeF should be considered in the differential diagnosis of pediatric glomerulonephritis, including MGN.
- Early and adequate immunosuppressive treatment can lead to favorable clinical outcomes in children with C3NeF-associated MGN.
- The persistence of complement abnormalities highlights the need for long-term monitoring and potential future therapeutic strategies.
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