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Extrahepatic manifestations of HCV where do we stand?
1National Research Center, Internal Medicine Department, Center of Excellence for Medical Research, Egypt.
Insights
Hepatitis C virus (HCV) infection frequently causes extrahepatic manifestations (EHM) through immune system alterations and cryoglobulinemia. Antiviral treatments are key, but longer follow-ups are needed to assess long-term clinical impact.
Area of Science:
- Hepatology
- Immunology
- Virology
Background:
- Hepatitis C virus (HCV) infection is linked to extrahepatic manifestations (EHM) in 40-70% of patients.
- HCV's lymphotropic nature, particularly B-cell tropism, triggers immunological alterations, immune complex formation, and cryoglobulinemia.
Purpose of the Study:
- To explore the mechanisms behind HCV-associated extrahepatic manifestations.
- To evaluate the role of cryoglobulinemia in EHM development.
- To assess the efficacy of antiviral treatments in managing EHM.
Main Methods:
- Review of existing literature on HCV, EHM, and cryoglobulinemia.
- Analysis of immunological pathways involved in HCV pathogenesis.
- Comparison of treatment outcomes between interferon and direct-acting antiviral eras.
Main Results:
- Cryoglobulinemia is a primary driver for many HCV-associated EHMs like vasculitis, glomerulonephritis, arthritis, and neuropathies.
- Direct viral cytopathic effects can also cause EHMs, independent of cryoglobulinemia.
- Antiviral therapies, from interferon to direct-acting antivirals, are the primary treatment for EHM, with similar clinical efficacy despite differing virological response rates.
Conclusions:
- HCV-associated EHMs stem from immune dysregulation and cryoglobulinemia, with direct viral effects being less common.
- Antiviral treatment is the cornerstone for managing HCV and its related EHM.
- Longer-term clinical evaluation and follow-up are essential to fully understand treatment effectiveness and disease progression.
Abstract:
Hepatitis C virus (HCV) infection has been associated as up 40-70% of patients with extrahepatic manifestations (EHM) and 36 different syndromes. These could be attributed to the fact that HCV is lymphotropic, particularly B lymphotropic, and not merely hepatotropic, and could trigger immunological alterations indirectly by exerting a chronic stimulus on the immune system with production of immunoglobulins having rheumatoid activity forming immune complexes and production of cryoglobulins. Cryoglobulinemoa plays a pivotal role in producing most EHM of HCV such as vasculitis, glomerulonephritis, arthritis and neuropathies. Less frequently; while less frequently, the direct viral cytopathic effect could lead to EHMs independent of cryoglobulinemia. The mainstay of treatment of EMH has been antivirals, since interferon era to direct-acting drugs era, with no differences between the two eras, despite the better virological response. Longer evaluation of virological response and clinical investigation with longer follow-ups are necessary.
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