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Hepatitis-B-associated glomerulonephritis: pathology, pathogenesis, and clinical course
V S Venkataseshan1, K Lieberman, D U Kim
1Mount Sinai School of Medicine, New York, NY.
Insights
Hepatitis B-associated glomerulonephritis (HBGN) is a kidney disease linked to chronic Hepatitis B virus (HBV) infection. This study details the clinicopathologic findings and outcomes in 12 patients, highlighting the importance of accurate diagnosis for prognosis and treatment.
Area of Science:
- Nephrology
- Hepatology
- Immunology
Background:
- Hepatitis B-associated glomerulonephritis (HBGN) is a distinct kidney disease frequently observed in regions with high Hepatitis B virus (HBV) prevalence.
- It affects both children and adults who are chronic HBV carriers, regardless of overt liver disease history.
- Diagnosis relies on serologic evidence of HBV, immune complex glomerulonephritis, HBV antigen localization in kidneys, and clinical history.
Purpose of the Study:
- To present clinicopathologic and follow-up findings in 12 patients diagnosed with HBGN.
- To analyze renal biopsy results using light microscopy, electron microscopy, and immunohistochemical methods.
- To investigate the morphological changes and the presence of HBV antigens in kidney tissues.
Main Methods:
- Analysis of 15 renal biopsies and 1 autopsy kidney specimen from 12 patients (7 children, 5 adults) with HBGN.
- Examination by light microscopy, electron microscopy, and immunohistochemical staining.
- Detection of HBV antigens (HBsAg, HBcAg, HBeAg) and immune deposits (immunoglobulins, complement components) in renal tissues.
Main Results:
- Commonly observed glomerular patterns included membranous glomerulonephritis (MGN), mesangiocapillary glomerulonephritis (MCGN), and proliferative glomerulonephritis.
- Electron microscopy revealed electron-dense deposits in glomeruli and occasionally along tubular basement membranes, with evidence of viral particles.
- Immunohistochemistry confirmed the presence of HBV antigens and immune deposits in the renal lesions.
- Follow-up biopsies showed disease transformation and partial resolution of lesions in some cases.
Conclusions:
- HBGN exhibits diverse histological patterns, characterized by immune complex deposition containing HBV antigens.
- Accurate differentiation of HBGN from other glomerulonephritides is crucial for appropriate management and improved patient outcomes.
- The study underscores the significance of integrating serological, histological, and immunohistochemical findings for diagnosing and understanding HBGN.
Abstract:
Hepatitis-B-associated glomerulonephritis (HBGN) is a distinct entity occurring frequently in hepatitis-B-prevalent areas of the world. The disease affects both adults and children who are chronic hepatitis-B-virus (HBV) carriers with or without a history of overt liver disease. The diagnosis is established by serologic evidence of HBV antigens/antibodies, presence of an immune complex glomerulonephritis, immunohistochemical localization of 1 or more HBV antigens, and pertinent clinical history, when available. In this study we present clinicopathologic and follow-up findings in 12 patients (7 children, 5 adults) with hepatitis-B-associated glomerulonephritis. Twelve patients provided 15 renal biopsies and 1 specimen of kidney tissue, obtained at autopsy; these were examined by light microscopy, electron microscopy, and immunohistochemical methods. Membranous glomerulonephritis (MGN) with or without mesangial proliferation was noted in 7 biopsies, mesangiocapillary (membranoproliferative) glomerulonephritis (MCGN) in 5 biopsies, and proliferative glomerulonephritis with or without membranous changes in 2 biopsies. Tubulointerstitial changes were minimal except in 3 adults, in whom they were attributable to arterionephrosclerosis. Ultrastructural findings included the presence of considerable amounts of focal or diffuse granular electron-dense deposits in the glomeruli, in the subepithelial, subendothelial, and mesangial locations, occasionally destroying or replacing the lamina densa of the basement membrane. Variable mesangial proliferation was also observed, with interposition, with focal irregular reduplication of the basement membranes and rare clusters of spherical particles, probably representing viral particles in the deposits. In addition, granular deposits along tubular basement membranes were seen in 1 case. The glomerular deposits stained for 2 or more immunoglobulins, the predominant one being IgG, and variably also for complement components (C3, C4 and C1q). Hepatitis B viral antigens (HBsAg, HBcAg, HBeAg) were demonstrated using acid elution techniques in the deposits in all biopsies where frozen tissue was available, singly or in a variety of combinations and intensities. There were deposits of IgG, C3, C1q, and HBsAg along the tubular basement membranes in 1 case. Follow-up biopsies in 2 cases, 2 and 5 years apart, showed a transformation from a diffuse MGN to MCGN with segmental membranous features. Follow-up biopsy after 3 years in the third patient, who went into clinical remission, revealed partially resolving glomerular lesions. Renal lesions secondary to chronic liver disease, parasitic diseases, certain tropical nephropathies, and lupus nephritis are some of the diseases that may morphologically resemble HBGN. Recognition and differentiation of HBGN from other entities may have significant prognostic and therapeutic implications.(ABSTRACT TRUNCATED AT 400 WORDS)