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C3 deposits worsens the prognosis in type iii extracapillary glomerulonephritis
Marina Sánchez-Agesta Martínez1, Cristina Rabasco Ruiz1, Rafael Sánchez Sánchez2
1UGC de Nefrología, Hospital Universitario Reina Sofía, Córdoba, España.
Insights
C3 deposits in Type iii extracapillary glomerulonephritis (PEGN) indicate a poorer renal prognosis and increased mortality. This finding highlights the role of complement activation in PEGN pathogenesis.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Type iii extracapillary glomerulonephritis (PEGN) is a significant cause of rapidly progressive glomerulonephritis, often linked to anti-neutrophil cytoplasmic antibodies (ANCAs).
- Emerging research suggests complement activation is a key factor in PEGN development.
- The prognostic significance of C3 deposits in PEGN requires further investigation.
Purpose of the Study:
- To evaluate the prognostic value of C3 deposits identified by immunofluorescence in patients with PEGN.
- To correlate C3 deposition with renal disease progression and patient mortality.
Main Methods:
- A cohort of 72 patients diagnosed with PEGN between 1995 and 2015 was analyzed.
- Patients were categorized based on the presence or absence of C3 deposits via immunofluorescence staining.
- Renal survival and mortality rates were compared between groups over a mean follow-up of 73 months, alongside clinical and histological variables.
Main Results:
- C3 deposits were detected in 30.5% (22/72) of PEGN patients.
- Patients with C3 deposits exhibited higher initial serum creatinine levels (P=0.050).
- Ten-year renal survival was significantly lower in patients with C3 deposits (36.9%) compared to those without (64.4%) (P=0.005).
- Ten-year mortality was substantially higher in the C3 deposit group (77%) versus the C3-negative group (49.3%).
Conclusions:
- PEGN characterized by C3 deposits is associated with adverse renal outcomes and increased mortality.
- These findings support the role of alternative complement pathway activation in driving renal injury in PEGN.
- C3 deposition serves as a potential biomarker for predicting prognosis in PEGN patients.
Introduction:
Type iii extracapillary glomerulonephritis (PEGN) is a common cause of rapidly progressive glomerulonephritis and it is usually associated with circulating anti-neutrophil cytoplasmic antibodies (ANCAs). Recent evidence points to complement activation as an important factor in the pathogenesis of PEGN. The aim of the present study was to assess the value of C3 deposits in the prognosis of PEGN.
Methods:
All patients diagnosed of PEGN from 1995 to 2015 (n=72) were included in this study. Progression of renal disease in patients with positive staining for C3 by immunofluorescence was compared with those with negative staining. Mean follow up was 73 months. Progression to end-stage renal disease in relation to clinical and histological variables was analyzed.
Results:
Positive staining for C3 was observed in 22 out of the 72 patients (30.5%). At the time of diagnosis, patients with C3 deposits had higher serum creatinine concentration than those without C3 staining (5.00 vs. 3.85mg/dl, P=0.050). Renal survival at 10 years was 36.9% in patients with positive C3 staining vs. 64.4% in patients with negative staining (P=0.005). Mortality at 10 years was higher in patients with C3 deposits than in patients without deposits (77 vs. 49.3%).
Conclusions:
Thus, our study shows that PEGN with deposits of C3 is associated with worse renal prognosis and greater mortality. These results would support the hypothesis that activation of the alternative pathway complement may play an important role in the generation of renal injury associated with PEGN.
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