Influenza B Virus-Specific CD8+ T-lymphocytes Strongly Cross-React With Viruses of the Opposing Influenza B Lineage

J Gen Virol. 2015 Aug;96(8):2061-2073. doi: 10.1099/vir.0.000156. Epub 2015 Apr 21.

Abstract

Influenza B viruses fall in two antigenically distinct lineages (B/Victoria/2/1987 and B/Yamagata/16/1988 lineage) that co-circulate with influenza A viruses of the H3N2 and H1N1 subtypes during seasonal epidemics. Infections with influenza B viruses contribute considerably to morbidity and mortality in the human population. Influenza B virus neutralizing antibodies, elicited by natural infections or vaccination, poorly cross-react with viruses of the opposing influenza B lineage. Therefore, there is an increased interest in identifying other correlates of protection which could aid the development of broadly protective vaccines. blast analysis revealed high sequence identity of all viral proteins. With two online epitope prediction algorithms, putative conserved epitopes relevant for study subjects used in the present study were predicted. The cross-reactivity of influenza B virus-specific polyclonal CD8+ cytotoxic T-lymphocyte (CTL) populations obtained from HLA-typed healthy study subjects, with intra-lineage drift variants and viruses of the opposing lineage, was determined by assessing their in vitro IFN-γ response and lytic activity. Here, we show for the first time, to the best of our knowledge, that CTLs directed to viruses of the B/Victoria/2/1987 lineage cross-react with viruses of the B/Yamagata/16/1988 lineage and vice versa.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Amino Acid Sequence
  • Antibodies, Viral / immunology
  • CD8-Positive T-Lymphocytes / chemistry
  • CD8-Positive T-Lymphocytes / immunology*
  • Cross Reactions*
  • Epitopes, T-Lymphocyte / genetics
  • Epitopes, T-Lymphocyte / immunology
  • Female
  • Humans
  • Influenza B virus / classification
  • Influenza B virus / genetics
  • Influenza B virus / immunology*
  • Influenza, Human / immunology*
  • Influenza, Human / virology
  • Male
  • Middle Aged
  • Molecular Sequence Data
  • Phylogeny
  • Sequence Homology, Amino Acid
  • Viral Proteins / chemistry
  • Viral Proteins / genetics
  • Young Adult

Substances

  • Antibodies, Viral
  • Epitopes, T-Lymphocyte
  • Viral Proteins