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Renal manifestations of hepatitis C infection
1Department of Veterans Affairs Medical Center, Lexington, Kentucky, USA.
Insights
Hepatitis C infection frequently causes kidney disease, often presenting as renal insufficiency or nephrotic syndrome. Current treatments like interferon show limited success, prompting research into new therapies for this significant health concern.
Area of Science:
- Nephrology
- Hepatology
- Immunology
Background:
- Hepatitis C virus (HCV) infection is a significant contributor to renal disease.
- Renal complications can be the initial clinical presentation of HCV infection.
- Approximately 50% of patients exhibit renal insufficiency, and up to 25% develop nephrotic syndrome.
Purpose of the Study:
- To review the clinical presentation and pathogenesis of hepatitis C-associated renal disease.
- To discuss current and emerging treatment strategies.
- To highlight the prognosis and potential progression to end-stage renal failure.
Main Methods:
- Review of existing literature on hepatitis C-associated renal disease.
- Analysis of pathogenetic mechanisms, focusing on immune complex deposition.
- Evaluation of treatment outcomes for interferon alpha-2b and other modalities.
Main Results:
- Membranoproliferative glomerulonephritis is the most common renal pathology.
- Immune complex deposition in the glomeruli is the suspected pathogenetic mechanism.
- Interferon alpha-2b offers limited efficacy, with frequent non-response and relapse rates.
Conclusions:
- Hepatitis C-associated renal disease is a serious complication with varied presentations.
- Current therapies have suboptimal outcomes, necessitating further research.
- A significant proportion of patients may require dialysis due to end-stage renal failure.
Abstract:
Hepatitis C is an important cause of renal disease, and renal complications may be the presenting manifestation of hepatitis C infection. About half of patients present with evidence of renal insufficiency, and up to one quarter present with nephrotic syndrome. Others present with proteinuria or evidence of diminished renal function. The pathogenesis of hepatitis C-associated renal disease remains incompletely defined, but most evidence suggests that glomerular injury results from deposition of circulating immune complexes in the subendothelium and mesangium. Membranoproliferative glomerulonephritis, with or without cryoglobulinemia, is the most common renal lesion. Interferon alpha-2b is currently the treatment of choice. However, success is limited, with many patients failing to respond or suffering relapse upon discontinuation of therapy. Studies of newer treatment modalities, such as longer courses of interferon or the use of ribavirin or immunosuppressive agents, are underway. Hepatitis C-associated renal disease may progress to end-stage renal failure requiring dialysis in about 10% of patients.