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Laboratory of Tumor Immunology and Biology, Division of Basic Science, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
Prostate-specific Ag (PSA), which is expressed in a majority of prostate cancers, is a potential target for specific immunotherapy. Previous studies have shown that two 10-mer PSA peptides (designated PSA-1 and PSA-3) selected to conform to human HLA class I-A2 motifs can elicit CTL responses in vitro. A longer PSA peptide (30-mer) designated PSA-OP (oligoepitope peptide), which contains both the PSA-1 and PSA-3 HLA-A2 epitopes and an additional potential CTL epitope (designated PSA-9) for the HLA-class I-A3 allele, was investigated for the ability to induce cytotoxic T cell activity. T cell lines from different HLA-A2 and HLA-A3 donors were established by in vitro stimulation with PSA-OP; the CTL lines lysed PSA-OP as well as PSA-1- or PSA-3-pulsed C1R-A2 cells, and PSA-OP and PSA-9-pulsed C1R-A3 cells, respectively. The CTL lines derived from the PSA-OP peptide also lysed PSA-positive prostate cancer cells. PSA-OP-derived T cell lines also lysed recombinant vaccinia-PSA-infected targets but not targets infected with wild-type vaccinia. PSA-OP did not bind HLA-A2 and HLA-A3 molecules. The decrease in cytotoxicity in the presence of protease inhibitors suggests that the PSA-OP is cleaved into shorter peptides, which in turn can interact with HLA-class I molecules and, as a consequence, induce CTL-mediated lysis. We have also demonstrated that it is possible to induce CTL responses in HLA-A2.1/Kb transgenic mice by immunization with PSA-OP with adjuvant. These studies thus provide evidence that oligopeptides such as PSA-OP may be useful candidates for peptide-based cancer vaccines.
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