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HLA-A2-restricted T-cell epitopes specific for prostatic acid phosphatase

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Abstract

Prostatic acid phosphatase (PAP) has been investigated as the target of several antigen-specific anti-prostate tumor vaccines. The goal of antigen-specific active immunotherapies targeting PAP would ideally be to elicit PAP-specific CD8+ effector T cells. The identification of PAP-specific CD8+ T-cell epitopes should provide a means of monitoring the immunological efficacy of vaccines targeting PAP, and these epitopes might themselves be developed as vaccine antigens. In the current report, we hypothesized that PAP-specific epitopes might be identified by direct identification of pre-existing CD8+ T cells specific for HLA-A2-restricted peptides derived from PAP in the blood of HLA-A2-expressing individuals. 11 nonamer peptides derived from the amino acid sequence of PAP were used as stimulator antigens in functional ELISPOT assays with peripheral blood mononuclear cells from 20 HLA-A2+ patients with prostate cancer or ten healthy blood donors. Peptide-specific T cells were frequently identified in both groups for three of the peptides, p18–26, p112–120, and p135–143. CD8+ T-cell clones specific for three peptides, p18–26, p112–120, and p299–307, confirmed that these are HLA-A2-restricted T-cell epitopes. Moreover, HLA-A2 transgenic mice immunized with a DNA vaccine encoding PAP developed epitope-specific responses for one or more of these three peptide epitopes. We propose that this method to first identify epitopes for which there are pre-existing epitope-specific T cells could be used to prioritize MHC class I-specific epitopes for other antigens. In addition, we propose that the epitopes identified here could be used to monitor immune responses in HLA-A2+ patients receiving vaccines targeting PAP to identify potentially therapeutic immune responses.

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Acknowledgments

This work was supported for BMO, TPF, LEJ and DGM by NIH (K23 RR16489) and the US Army Medical Research and Materiel Command (DAMD 17-03-1-0050 and W81XWH-07-1-0038). This work was supported for KLK and MLD by grants from the NIH (K24 CA85218 and R01 CA75163), and for LF by R01 CA136753.

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Correspondence to Douglas G. McNeel.

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Olson, B.M., Frye, T.P., Johnson, L.E. et al. HLA-A2-restricted T-cell epitopes specific for prostatic acid phosphatase. Cancer Immunol Immunother 59, 943–953 (2010). https://doi.org/10.1007/s00262-010-0820-6

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  • DOI: https://doi.org/10.1007/s00262-010-0820-6

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