antigen specificity, CD4+ T lymphocyte, cytokine production, memory T lymphocyte, dendritic cell, T cell depletion
To determine whether strong CD4+ T cell immunity could be induced to a nonmutated self protein that is important for tumorigenesis, we selectively targeted the xenogencic form of survivin, a survival protein overexpressed in tumors, to maturing dendritic cells in lymphoid tissues. Dendritic cell targeting via the DEC205 receptor in the presence of anti-CD40 and poly(I:C) as maturation stimuli, induced strong human and mouse survivin-specific CD4+ T cell responses, as determined by IFN-γ, TNF-α, and IL-2 production, as well as the development of lytic MHC class II-restricted T cells and memory. Immunity was enhanced further by depletion of CD25+foxp3+ cells before vaccination. anti-DEC205-human survivin was superior in inducing CD4+ T cell responses relative to other approaches involving survivin plasmid DNA or survival peptides with adjuvants. However, we were unable to induce CD8 + T cell immunity to survivin by two doses of DEC205-targeted survivin or the other strategies. Therefore, significant CD4+ T cell immunity to a self protein that is overexpressed in most human cancers can be induced by DEC205 targeting of the Ag in its xenogeneic form to maturing DCs.
Charalambous, A., M. Oks, G. Nchinda, S. Yamazaki, and R. M. Steinman. 2006. "Dendritic Cell Targeting of Survivin Protein in a Xenogeneic Form Elicits Strong CD4+ T Cell Immunity to Mouse Survivin." Journal of Immunology 177 (12): 8410-8421