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

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Assudani, D; Cho, H-I; DeVito, N; Bradley, N; Celis, E

Published Date

  • December 1, 2008

Published In

Volume / Issue

  • 68 / 23

Start / End Page

  • 9892 - 9899

PubMed ID

  • 19047170

Pubmed Central ID

  • PMC2679655

Electronic International Standard Serial Number (EISSN)

  • 1538-7445

Digital Object Identifier (DOI)

  • 10.1158/0008-5472.CAN-08-3134


  • eng

Conference Location

  • United States