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- W1503001978 abstract "Adoptive immunotherapy involving the transfer of autologous tumor or virus-reactive T lymphocytes has demonstrated its effectiveness in the eradication of cancer and virally infected cells. Clinical trails and in vitro studies have focused on CD8+ cytotoxic T-cell receptor (TCR) alphabeta lymphocytes since these cells directly kill virally infected- and tumor cells after antigen-specific recognition via their TCR alphabeta. However, increasing evidence suggests that induction of sustained immunity against cancer and viral infections depends on the presence of tumor- or virus-specific CD4+ T lymphocytes, which are restricted by MHC class II. Here, we show that these MHC class II-restricted CD4+ T lymphocytes can efficiently be redirected to MHC class I-restricted tumor cells by retroviral introduction of an HLA-A1/MAGE-A1-specific chimeric two-chain TCR ValphaCalphazeta/VbetaCbetazeta (tcTCR/zeta). However, TCR-transduced CD4+ T lymphocytes were only able to specifically bind to HLA-A1/MAGE-A1 complexes and respond to HLA-A1+/MAGE-A1+ melanoma cells when the CD8alpha gene was cointroduced. These CD4+/CD8alpha+/TCR(POS) T lymphocytes produce IFN-gamma, TNFalpha and IL-2 when specifically stimulated via the introduced TCR with immobilized HLA-A1/MAGE-A1 complexes or HLA-A1+/MAGE-A1+ melanoma cells. Furthermore, introduction of the CD8alpha gene into TCR(POS) T lymphocytes rendered these T lymphocytes cytotoxic for HLA-A1+/MAGE-A1+ melanoma cells. These results demonstrate that human CD4+ T lymphocytes when genetically grafted with an HLA-A1/MAGE-A1-specific TCR and CD8alpha are induced to kill and produce cytokines upon specific interaction with the relevant melanoma cells. Hence, CD4+ T lymphocytes, in addition to CD8+ T lymphocytes, may be critical effector cells for adoptive immuno-gene therapy to generate a sustained tumor-specific immune response in cancer patients." @default.
- W1503001978 created "2016-06-24" @default.
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- W1503001978 date "2004-10-21" @default.
- W1503001978 modified "2023-10-14" @default.
- W1503001978 title "Redirecting human CD4+ T lymphocytes to the MHC class I-restricted melanoma antigen MAGE-A1 by TCR αβ gene transfer requires CD8α" @default.
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- W1503001978 doi "https://doi.org/10.1038/sj.gt.3302388" @default.
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