In vivo expansion, persistence, and function of peptide vaccine-induced CD8 T cells occur independently of CD4 T cells

Deepak Assudani, Hyun Il Cho, Nicholas DeVito, Norma Bradley, Esteban Celis

Research output: Contribution to journalArticle

44 Scopus citations


Significant efforts are being devoted toward the development of effective therapeutic vaccines against cancer. Specifically, well-characterized subunit vaccines, which are designed to generate antitumor cytotoxic CD8 T-cell responses. Because CD4 T cells participate at various stages of CD8 T-cell responses, it is important to study the role of CD4 T cells in the induction and persistence of antitumor CD8 T-cell responses by these vaccines. Recent evidence points to the requirement of CD4 T cells for the long-term persistence of memory CD8 T cells, which in the case of cancer immunotherapy would be critical for the prevention of tumor recurrences. The purpose of the present study was to assess whether CD4 T cells are necessary for the generation and maintenance of antigen-specific CD8 T cells induced by subunit (peptide or DNA) vaccines. We have used a vaccination strategy that combines synthetic peptides representing CD8 T-cell epitopes, a costimulatory anti-CD40 antibody and a Toll-like receptor agonist (TriVax) to generate large numbers of antigen-specific CD8 T-cell responses. Our results show that the rate of decline (clonal contraction) of the antigen-specific CD8 T cells and their functional state is not affected by the presence or absence of CD4 T cells throughout the immune response generated by TriVax. We believe that these results bear importance for the design of effective vaccination strategies against cancer.

Original languageEnglish (US)
Pages (from-to)9892-9899
Number of pages8
JournalCancer Research
Issue number23
Publication statusPublished - Dec 1 2008
Externally publishedYes


ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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