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Toward the development of multi-epitope p53 cancer vaccines: Anin vitroassessment of CD8+T cell responses to HLA class I-restricted wild-type sequence p53 peptides

Authors
Publisher
Elsevier Inc.
Publication Date
Volume
125
Issue
1
Identifiers
DOI: 10.1016/j.clim.2007.05.015
Keywords
  • P53
  • Cd8+T Cells
  • Immune Response
  • Head And Neck Cancer
  • Elispot
Disciplines
  • Medicine

Abstract

Abstract Wild-type sequence (wt) p53 peptides are attractive candidates for broadly applicable cancer vaccines. Six HLA-A2 or HLA-A24-restricted wt p53 peptides were evaluated for their ex vivo immunogenicity and their potential for use in cancer vaccines. Peripheral blood mononuclear cells (PBMC) obtained from HLA-A⁎0201 + and/or HLA-A⁎2402 + normal donors and subjects with squamous cell carcinoma of the head and neck (SCCHN) were analyzed for p53 peptide-specific reactivity in ELISPOT IFN-γ assays. CD8 + T cells in 7/10 normal donors (HD) and 11/23 subjects with SCCHN responded to at least one of the wt p53 peptides. CD8 + T cell precursors responsive to wt p53 epitopes were detected in the circulation of most subjects with early disease, and an elevated blood Tc 1/Tc 2 ratio distinguished wt p53 peptide responders from non-responders. The identification of multiple wt p53 peptides able to induce cytolytic T lymphocytes in most subjects with cancer promotes the development of multi-epitope p53 vaccines.

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