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- W2137627847 abstract "Cancer cells display novel phosphopeptides in association with MHC class I and II molecules. In this study, we evaluated two HLA-A2-restricted phosphopeptides derived from the insulin receptor substrate (IRS)-2 and the cell-cycle regulator CDC25b. These proteins are both broadly expressed in multiple malignancies and linked to cancer cell survival. Two phosphopeptides, termed pIRS-21097-1105 and pCDC25b38-46, served as targets of strong and specific CD8 T-cell memory responses in normal human donors. We cloned T-cell receptor (TCR) cDNAs from murine CD8 T-cell lines specific for either pIRS-21097-1105 or pCDC25b38-46. Expression of these TCRs in human CD8 T cells imparted high-avidity phosphopeptide-specific recognition and cytotoxic and cytokine-secreting effector activities. Using these cells, we found that endogenously processed pIRS-21097-1105 was presented on HLA-A2(+) melanomas and breast, ovarian, and colorectal carcinomas. Presentation was correlated with the level of the Ser(1100)-phosphorylated IRS-2 protein in metastatic melanoma tissues. The highest expression of this protein was evident on dividing malignant cells. Presentation of endogenously processed pCDC25b38-46 was narrower, but still evident on HLA-A2(+) melanoma, breast carcinoma, and lymphoblastoid cells. Notably, pIRS-21097-1105-specific and pCDC25b38-46-specific TCR-expressing human CD8 T cells markedly slowed tumor outgrowth in vivo. Our results define two new antigens that may be developed as immunotherapeutic agents for a broad range of HLA-A2(+) cancers." @default.
- W2137627847 created "2016-06-24" @default.
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- W2137627847 date "2014-11-30" @default.
- W2137627847 modified "2023-10-16" @default.
- W2137627847 title "MHC-Restricted Phosphopeptides from Insulin Receptor Substrate-2 and CDC25b Offer Broad-Based Immunotherapeutic Agents for Cancer" @default.
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- W2137627847 doi "https://doi.org/10.1158/0008-5472.can-14-0043" @default.
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