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Original Article
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Volume 328:465-470 February 18, 1993 Number 7
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Membranoproliferative Glomerulonephritis Associated with Hepatitis C Virus Infection
Richard J. Johnson, David R. Gretch, Hideaki Yamabe, Jaime Hart, Carlos E. Bacchi, Peter Hartwell, William G. Couser, Lawrence Corey, Mark H. Wener, Charles E. Alpers, and Richard Willson

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ABSTRACT

Background and Methods Hepatitis C virus (HCV) infection causes both acute and chronic liver disease and is also associated with mixed cryoglobulinemia. Whether HCV is also associated with renal disease, as is the hepatitis B virus, is not known. We describe the clinical, pathologic, virologic, and immunologic features of eight patients with HCV infection who were referred to nephrologists for glomerulonephritis. Four patients were treated with interferon alfa.

Results All eight patients had proteinuria, and seven had decreased renal function. Renal biopsy in all patients revealed membranoproliferative glomerulonephritis, characterized by the deposition of IgG, IgM, and C3 in glomeruli. Electron microscopy of the biopsy specimens showed cryoglobulin-like structures in three of four patients. All eight patients had HCV RNA detected in their serum, elevated serum aminotransferase concentrations, and hypocomplementemia, and the majority had cryoglobulins and circulating immune complexes in their serum. Cryoprecipitates from the three patients who were tested contained HCV RNA and IgG anti-HCV antibodies to the nucleocapsid core antigen (HCVc or c22-3). IgM rheumatoid factors, present in all patients, bound anti-HCV IgG in all six patients tested. Four patients received interferon alfa for 2 to 12 months; all had evidence of decreased HCV replication and improvement of their renal and liver disease.

Conclusions Chronic HCV infection is associated with cryoglobulinemia and membranoproliferative glomerulonephritis. The pathogenesis is unknown, but may relate to deposition within glomeruli of immune complexes containing HCV, anti-HCV IgG, and IgM rheumatoid factors.


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From the Divisions of Nephrology and Gastroenterology, Departments of Medicine (R.J.J., J.H., P.H., W.G.C., L.C., M.H.W., R.W.), Laboratory Medicine (D.R.G., L.C., M.H.W.), and Pathology (C.E.B., C.E.A.), University of Washington Medical Center, Seattle, and the Division of Nephrology, Department of Medicine, Hirosaki University School of Medicine, Hirosaki, Japan (H.Y.).

Address reprint requests to Dr. Johnson at the Division of Nephrology, BB-1257 Health Sciences, University of Washington Medical Center, Seattle, WA 98195.

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