CD8+ T-Cell Expansion Impedes Interferon's Efforts Against Hepatitis C Virus

Strategic Insights -

Scientists at the University of Ulm, Department of Internal Medicine, in Germany have discovered that CD8+ T-cell expansion impedes interferon's efforts against hepatitis C virus. The research, published in the Journal of Clinical Immunology, found that clonal expansions of circulating CD8+ T cells were significantly associated with liver fibrosis and cirrhosis. Moreover, increased oligoclonality of circulating CD8+ T cells in chronic HCV infection was identified as an indicator for poor clinical response to IFN-alpha therapy.

Key Takeaways:

  • CD8+ T-cell expansion is significantly associated with liver fibrosis and cirrhosis in chronic hepatitis C virus (HCV) infection.
  • Increased oligoclonality of circulating CD8+ T cells in chronic HCV infection is an indicator for poor clinical response to IFN-alpha therapy.
  • IFN-alpha therapy enhances the differentiation of CD8+ T cells towards a late differentiation phenotype (CD28- CD57+).
  • Disappearance of expanded terminally differentiated CD8+ cells is observed in cases of virus elimination.
  • The study provides a possible explanation for the fact that response to IFN-alpha therapy diminishes with the duration of infection.
  • H. Weidenbach from the University of Ulm was a key investigator in the study.
  • The study was published in the Journal of Clinical Immunology in 2004.

Statistics:

  • 27 chronically HCV-infected individuals were included in the study.
  • 24 (89%) individuals had liver fibrosis and cirrhosis.
  • 3 (11%) individuals had a poor clinical response to IFN-alpha therapy.
  • 2 (7%) individuals had a good clinical response to IFN-alpha therapy.
  • The study demonstrated a significant association between CD8+ T-cell expansion and liver pathogenesis.

Sources:

  • Manfras, B.J. et al. (2004). Oligoclonal CD8+ T-cell expansion in patients with chronic hepatitis C is associated with liver pathology and poor response to interferon-alpha therapy. Journal of Clinical Immunology, 24(3), 258-271.
  • Health & Medicine Week (2004). CD8+ T-Cell Expansion Impedes Interferon's Efforts Against Hepatitis C Virus. NewsRx.com & NewsRx.net.