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Cramp, M.E. et al.

Hepatitis C virus-specific T-cell reactivity during interferon and ribavirin treatment in chronic hepatitis C.

BACKGROUND & AIMS: The role of virus-specific T-helper lymphocyte reactivity in determining the therapeutic response in chronic hepatitis C virus (HCV) infection is not fully understood. METHODS: We studied CD4(+) T lymphocyte proliferation together with interferon (IFN)-gamma and interleukin (IL)-10 production from peripheral blood mononuclear cells in response to 4 HCV antigens (core, NS3, NS4, and NS5) in 25 patients with chronic hepatitis C undergoing antiviral therapy with IFN alone or in combination with ribavirin, prospectively, before, during, and after treatment. RESULTS: HCV-specific T-cell reactivity was uncommon at baseline but increased markedly during antiviral therapy, peaking around treatment weeks 4-8. Resolution of hepatitis C viremia was significantly more likely in patients who developed HCV-specific T-cell proliferation with increased IFN-gamma production. The main difference in T-cell reactivity of patients treated with IFN plus ribavirin was a significantly lower production of IL-10, whereas lymphocyte proliferation was similar to that in patients receiving IFN monotherapy. CONCLUSIONS: Treatment-induced control of hepatitis C viremia is associated with the development of HCV-specific T-cell responses with enhanced IFN-gamma and low IL-10 production. The greater efficacy of combination therapy with IFN-alpha plus ribavirin may be related to its ability to suppress HCV-specific IL-10 production.[1]

References

Hepatitis C virus-specific T-cell reactivity during interferon and ribavirin treatment in chronic hepatitis C. Cramp, M.E., Rossol, S., Chokshi, S., Carucci, P., Williams, R., Naoumov, N.V. Gastroenterology (2000) [Pubmed]

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