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Inhibition of major histocompatibility complex Class I antigen presentation by hepatitis C virus core protein in

James O'Beirne1, Jon Mitchell, Farzin Farzaneh

  • 1Department of Liver Studies and Transplantation, Kings College London, Denmark Hill Campus, London SE59PJ, UK.

Virology
|May 5, 2009
PubMed

Insights

Hepatitis C virus core protein hinders dendritic cells from activating CD8+ T cells by interfering with MHC class I presentation. This mechanism may explain how the virus persists in infected individuals.

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Hepatitis C virus (HCV) infection often leads to chronic disease, partly due to immune evasion.
  • Dendritic cells (DCs) are crucial for initiating adaptive immune responses, particularly CD8+ T cell priming.
  • The HCV core protein's role in modulating DC function and T cell responses requires further elucidation.

Purpose of the Study:

  • To investigate the impact of Hepatitis C virus core (HCVcore) protein expression in myeloid dendritic cells (DCs) on their ability to prime CD8+ T cells.
  • To determine if HCVcore protein affects the surface expression of MHC class I/peptide complexes.
  • To understand the mechanism by which HCVcore protein might contribute to immune persistence.

Main Methods:

  • Expression of full-length (HCVcore(191)) and truncated (HCVcore(152)) HCVcore proteins in mouse myeloid DCs via mRNA electroporation.
  • Analysis of surface H-2K(b)/SIINFEKL complex levels using flow cytometry.
  • Assessment of DC priming capacity for CD8+ T cells specific for the SIINFEKL peptide, under conditions of endogenous antigen processing versus direct peptide loading.

Main Results:

  • Full-length HCVcore(191), localized to the endoplasmic reticulum, significantly reduced surface H-2K(b)/SIINFEKL complex levels.
  • Truncated HCVcore(152), with broader subcellular localization, did not show this effect.
  • DCs expressing HCVcore(191) exhibited impaired CD8+ T cell priming when processing endogenous antigens, but not when MHC class I was directly loaded with peptide.

Conclusions:

  • HCVcore protein interferes with the MHC class I antigen processing pathway in DCs.
  • This interference impairs the ability of DCs to stimulate antigen-specific CD8+ T cells.
  • The mechanism of immune evasion mediated by HCVcore protein may contribute to the persistence of Hepatitis C virus infection.

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