Detection of hepatitis C virus core protein in the glomeruli of patients with membranous glomerulonephritis
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K Okada1, Y Takishita, H Shimomura
1Department of Pediatrics, School of Medicine, University of Tokushima, Japan.
Insights
Hepatitis C virus (HCV) infection can cause membranous glomerulonephritis. Researchers found HCV proteins in glomeruli, suggesting immune complex deposition drives kidney disease in some patients.
Area of Science:
- Nephrology
- Virology
- Immunology
Background:
- Membranous glomerulonephritis (MGN) is a leading cause of nephrotic syndrome in adults.
- Hepatitis C virus (HCV) infection is a known extrahepatic manifestation associated with various renal diseases.
- The specific mechanisms linking HCV to MGN require further elucidation.
Observation:
- Two Japanese patients with HCV infection presented with MGN.
- Renal biopsies showed characteristic histological changes of MGN, including IgG and C3 deposition.
- HCV RNA and core proteins were detected in patient sera and glomeruli, respectively.
Findings:
- HCV RNA was found free and in immune complexes in patient sera.
- HCV core proteins were identified within the glomeruli of both patients.
- Absence of cryoglobulins and rheumatoid factors in both patients.
Implications:
- Chronic HCV infection may directly cause MGN through immune complex deposition involving viral proteins.
- This finding highlights the importance of screening for HCV in patients with unexplained MGN.
- Further research into HCV-associated glomerulonephritis could lead to targeted therapies.
Abstract:
Two Japanese patients suffered from membranous glomerulonephritis associated with hepatitis C virus (HCV) infection. Renal histologic changes were characterized by granular deposits of IgG and C3 along the capillary wall and numerous subepithelial deposits in glomeruli. Hypocomplementemia was present in one patient, but both cryoglobulins and rheumatoid factors were absent. HCV RNA was detected in both their sera by RT-PCR, both free and in the form of circulating immune complexes. The HCV core protein was found in the glomeruli from both patients by indirect immunofluorescence. These results suggest that in some patients chronic HCV infection causes membranous glomerulonephritis through immune complex deposition involving HCV proteins.