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[Hepatitis B virus, the main cause of membranous nephropathy in China]
Abstract:
To investigate the role of hepatitis B virus in the pathogenesis of membranous nephropathy (MN) in China, we studied 67 MN patients (excluding lupas nephritis V) with immunoperoxidase technique. In 46 (68.2%) of the 67 MN patients, HBV antigens (HBsAg, HBcAg and HBeAg) were detected in their glomeruli, and HBsAg, the dominant antigen was detected in 45 patients (67.2%). HBV-Ag was detected less frequently in the older MN group (33.3%) (> 50 years old) than in the two younger MN groups (73.1%, 75%) (< 30 years old, 30-50 years old) (P < 0.05). 30 randomly selected MsPGN patients were studied as controls. HBV antigens were detected in only 3 out of the 30 MsPGN patients. The HBV antigen positivity rate of the MN group was significantly higher than that of the MsPGN group (P < 0.01). The results suggested that HBV may be the main cause of MN in China, especially in those younger than 50 years, but not of MsPGN. HBsAg containing immune complexs (IC) may play an important role in the pathogenesis of HBV-MN.
Insights
Hepatitis B virus (HBV) is strongly linked to membranous nephropathy (MN) in China, particularly in patients under 50. HBV antigens were found in most MN patients but rarely in controls, suggesting HBV causes MN.
Area of Science:
- Nephrology
- Virology
- Immunopathology
Background:
- Membranous nephropathy (MN) is a significant cause of nephrotic syndrome.
- The etiology of MN, especially in China, requires further elucidation.
- Hepatitis B virus (HBV) infection is prevalent in China.
Purpose of the Study:
- To investigate the role of hepatitis B virus (HBV) in the pathogenesis of membranous nephropathy (MN) in Chinese patients.
- To determine the prevalence of HBV antigens in the glomeruli of MN patients.
- To compare HBV antigen detection rates between MN patients and control groups.
Main Methods:
- Studied 67 MN patients (excluding lupus nephritis V) and 30 patients with mesangial proliferative glomerulonephritis (MsPGN) as controls.
- Utilized the immunoperoxidase technique to detect HBV antigens (HBsAg, HBcAg, HBeAg) in renal glomeruli.
- Analyzed antigen detection rates based on patient age groups.
Main Results:
- HBV antigens were detected in the glomeruli of 68.2% of MN patients, with HBsAg being the dominant antigen (67.2%).
- HBV antigen positivity was significantly higher in MN patients (P < 0.01) compared to MsPGN controls (3/30).
- Younger MN patients (<50 years) showed higher HBV antigen detection rates (73.1%, 75%) than older patients (>50 years, 33.3%) (P < 0.05).
Conclusions:
- HBV is suggested to be a primary cause of MN in China, especially in individuals under 50 years old.
- HBV is not a significant cause of mesangial proliferative glomerulonephritis (MsPGN).
- HBsAg-containing immune complexes likely play a crucial role in the pathogenesis of HBV-associated MN.