Survivin is a tumor-associated antigen (TAA) that has significant potential for use as a cancer vaccine target. To identify
survivin epitopes that might serve as targets for CTL-mediated, anti-tumor responses, we evaluated a series of survivin peptides
with predicted binding to mouse H2-K
b and human HLA-A*0201 antigens in peptide-loaded dendritic cell (DC) vaccines. H2-K
b-positive, C57BL/6 mice were vaccinated using syngeneic, peptide-loaded DC2.4 cells. Splenocytes from vaccinated mice were
screened by flow cytometry for binding of dimeric H2-K
b:Ig to peptide-specific CD8+ T cells. Two survivin peptides (SVN
57–64 and SVN
82–89) generated specific CD8+ T cells. We chose to focus on the SVN
57–64 peptide because that region of the molecule is 100% homologous to human survivin. A larger peptide (SVN
53–67), containing multiple class I epitopes, and a potential class II ligand, was able to elicit both CD8+ CTL and CD4+ T cell
help. We tested the SVN
53–67 15-mer peptide in a therapeutic model using a peptide-loaded DC vaccine in C57BL/6 mice with survivin-expressing GL261 cerebral
gliomas. This vaccine produced significant CTL responses and helper T cell-associated cytokine production, resulting in a
significant prolongation of survival. The SVN
53–67 vaccine was significantly more effective than the SVN
57–64 core epitope as a cancer vaccine, emphasizing the potential benefit of incorporating multiple class I epitopes and associated
cytokine support within a single peptide.
Keywords Dendritic cell - Glioma - Peptide - Survivin - Tumor antigen - Vaccine