Peptide-pulsed dendritic cells induce the hepatitis C viral epitope-specific responses of naïve human T cells

Sasmita Mishra, Phyllis T. Losikoff, Alyssa A. Self, Frances Terry, Matthew T. Ardito, Ryan Tassone, William D. Martin, Anne S. De Groot, Stephen H. Gregory

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Hepatitis C virus (HCV) is a major cause of liver disease. Spontaneous resolution of infection is associated with broad, MHC class I- (CD8+) and class II-restricted (CD4+) T cell responses to multiple viral epitopes. Only 20% of patients clear infection spontaneously, however, most develop chronic disease. The response to chemotherapy varies; therapeutic vaccination offers an additional treatment strategy. To date, therapeutic vaccines have demonstrated only limited success in clinical trials. Vector-mediated vaccination with multi-epitope-expressing DNA constructs provides an improved approach. Highly-conserved, HLA-A2-restricted HCV epitopes and HLA-DRB1-restricted immunogenic consensus sequences (ICS, each composed of multiple overlapping and highly conserved epitopes) were predicted using bioinformatics tools and synthesized as peptides. HLA binding activity was determined in competitive binding assays. Immunogenicity and the ability of each peptide to stimulate naïve human T cell recognition and IFN-γ production were assessed in cultures of total PBMCs and in co-cultures composed of peptide-pulsed dendritic cells (DCs) and purified T lymphocytes, cell populations derived from normal blood donors. Essentially all predicted HLA-A2-restricted epitopes and HLA-DRB1-restricted ICS exhibited HLA binding activity and the ability to elicit immune recognition and IFN-γ production by naïve human T cells. The ability of DCs pulsed with these highly-conserved HLA-A2- and -DRB1-restricted peptides to induce naïve human T cell reactivity and IFN-γ production ex vivo demonstrates the potential efficacy of a multi-epitope-based HCV vaccine targeted to dendritic cells.

Original languageEnglish
Pages (from-to)3285-3292
Number of pages8
JournalVaccine
Volume32
Issue number26
DOIs
StatePublished - May 30 2014

Keywords

  • Dendritic cell
  • EpiMatrix
  • Epitope
  • HCV
  • T cell
  • Vaccine

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