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[Clinicopathological study of Henoch-Schönlein purpura nephritis with special reference to C3c deposits]
Insights
Glomerular C3c deposits in Henoch-Schönlein purpura nephritis (HSPN) are linked to clinical outcomes in children. Complement activation appears early in HSPN, influencing disease progression and proteinuria duration.
Area of Science:
- Nephrology
- Pediatric Nephrology
- Immunology
Background:
- Henoch-Schönlein purpura nephritis (HSPN) is a common childhood vasculitis affecting the kidneys.
- Glomerular C3c deposits are a characteristic finding in HSPN, but their clinical significance requires further elucidation.
- Understanding the role of complement activation in HSPN is crucial for predicting disease course.
Purpose of the Study:
- To evaluate the association between glomerular C3c deposits and clinical manifestations in pediatric HSPN patients.
- To investigate the relationship between C3c deposits, proteinuria, hematuria, and histological findings.
- To determine if C3c deposits indicate early complement activation in HSPN.
Main Methods:
- Clinicopathological analysis of 51 children (aged 7-15) with HSPN.
- Histological assessment using light and electron microscopy.
- Comparative study of C3c-positive versus C3c-negative patient groups.
Main Results:
- Crescent formation and subepithelial electron-dense deposits correlated with proteinuria and hematuria duration.
- Glomerular C3c deposits were significantly more prevalent in patients with heavy proteinuria (65%) compared to mild proteinuria (30%).
- C3c-positive patients showed a tendency for prolonged proteinuria/hematuria, with earlier biopsies performed in those with global C3c deposits.
Conclusions:
- Glomerular C3c deposits appear to influence the clinical course of pediatric HSPN.
- Complement activation is likely generated in the early stages of HSPN.
- C3c deposition may serve as a biomarker for disease activity and duration in children with HSPN.
Abstract:
The aim of this study was to evaluate glomerular C3c deposits of Henoch-Schönlein purpura nephritis (HSPN) in children. Fifty-one patients aged 7-15 years (20 males and 31 females) were studied. On histological investigation, crescent formation seen under light microscopy and subepithelial electron dense deposits (EDD) under electron microscopy were found to be related to the degree of proteinuria and the duration of proteinuria and/or hematuria. A comparative clinicopathological study was performed on C3c-positive patients (n = 22) and C3c-negative patients (n = 25). Histological findings, such as crescent formation and subepithelial EDD, had no relation to glomerular C3c-deposits. At renal biopsy, C3c deposits were positive in 65 % of patients with heavy proteinuria ( > 100mg/kg/day), and in 30% of mild proteinuria patients ( < 50mg/kg/day). The difference between the two groups was statistically significant (p < 0.05). The duration of proteinuria and/or hematuria in C3c-positive patients had a tendency to persist in comparison with that in C3c-negative cases. Renal biopsies on many cases of C3c-negarive patients were performed following the lapse of three months, while the biopsies on patients showing global (+) C3c deposits (n = 15) were conducted within the three-month period. These results suggest that glomerular C3c deposits influence the clinical conditions of patients with HSPN, and complement activation is generated in the early stage of HSPN.