STEAP, a prostate tumor antigen, is a target of human CD8+ T cells

Cancer Immunology, Immunotherapy : CII
Pedro M S AlvesK Kosmatopoulos

Abstract

STEAP is a recently identified protein shown to be particularly overexpressed in prostate cancer and also present in numerous human cancer cell lines from prostate, pancreas, colon, breast, testicular, cervical, bladder and ovarian carcinoma, acute lymphocytic leukemia and Ewing sarcoma. This expression profile renders STEAP an appealing candidate for broad cancer immunotherapy. In order to investigate if STEAP is a tumor antigen that can be targeted by specific CD8(+) T cells, we identified two high affinity HLA-A*0201 restricted peptides (STEAP(86-94) and STEAP(262-270)). These peptides were immunogenic in vivo in HLA-A*0201 transgenic HHD mice. Peptide specific murine CD8 T cells recognized COS-7 cells co-transfected with HHD (HLA-A*0201) and STEAP cDNA constructs and also HLA-A*0201(+) STEAP(+) human tumor cells. Furthermore, STEAP(86-94) and STEAP(262-270) stimulated specific CD8(+) T cells from HLA-A*0201(+) healthy donors, and these peptide specific CD8(+) T cells recognized STEAP positive human tumor cells in an HLA-A*0201-restricted manner. Importantly, STEAP(86-94)-specific T cells were detected and reactive in the peripheral blood mononuclear cells in NSCLC and prostate cancer patients ex vivo. These results show tha...Continue Reading

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Oct 13, 2006·Cancer Immunology, Immunotherapy : CII·Andrea MarrariLicia Rivoltini
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