Identification of novel avian influenza virus derived CD8+ T-cell epitopes

PLoS One. 2012;7(2):e31953. doi: 10.1371/journal.pone.0031953. Epub 2012 Feb 23.

Abstract

Avian influenza virus (AIV) infection is a continuing threat to both humans and poultry. Influenza virus specific CD8+ T cells are associated with protection against homologous and heterologous influenza strains. In contrast to what has been described for humans and mice, knowledge on epitope-specific CD8+ T cells in chickens is limited. Therefore, we set out to identify AIV-specific CD8+ T-cell epitopes. Epitope predictions based on anchor residues resulted in 33 candidate epitopes. MHC I inbred chickens were infected with a low pathogenic AIV strain and sacrificed at 5, 7, 10 and 14 days post infection (dpi). Lymphocytes isolated from lung, spleen and blood were stimulated ex vivo with AIV-specific pooled or individual peptides and the production of IFNγ was determined by ELIspot. This resulted in the identification of 12 MHC B12-restricted, 3 B4-restricted and 1 B19-restricted AIV- specific CD8+ T-cell epitopes. In conclusion, we have identified novel AIV-derived CD8+ T-cell epitopes for several inbred chicken strains. This knowledge can be used to study the role of CD8+ T cells against AIV infection in a natural host for influenza, and may be important for vaccine development.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • CD8-Positive T-Lymphocytes / cytology*
  • CD8-Positive T-Lymphocytes / virology
  • Cell Line
  • Chickens
  • Epitopes, T-Lymphocyte / chemistry*
  • Flow Cytometry / methods
  • Histocompatibility Antigens Class I / chemistry
  • Influenza A Virus, H5N1 Subtype / metabolism*
  • Influenza in Birds / metabolism
  • Interferon-gamma / metabolism
  • Leukocytes, Mononuclear / virology
  • Lung / virology
  • Lymphocytes / cytology
  • Lymphocytes / virology
  • Peptides / chemistry

Substances

  • Epitopes, T-Lymphocyte
  • Histocompatibility Antigens Class I
  • Peptides
  • Interferon-gamma