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• W185283559 startingPage "549" @default.
• W185283559 abstract "Abstract In contrast to other neoplasms, antigen-specific autologous cytolytic T cells have not been detected in patients with human pre-B–cell leukemias. The absence of efficient B7 family (B7-1/CD80; B7-2/CD86) -mediated costimulation has been shown to be a major defect in tumor cells' capacity to function as antigen-presenting cells. We show here the generation of autologous anti–pre-B–cell leukemia-specific cytolytic T-cell lines from the marrows of 10 of 15 patients with pre-B–cell malignancies. T-cell costimulation via CD28 is an absolute requirement for the generation of these autologous cytolytic T cells (CTL). Although costimulation could be delivered by either bystander B7 transfectants or professional antigen-presenting cells (indirect costimulation), optimal priming and CTL expansion required that the costimulatory signal was expressed by the tumor cell (direct costimulation). These anti–pre-B–cell leukemia-specific CTL lysed both unstimulated and CD40-stimulated tumor cells from each patient studied but did not lyse either K562 or CD40-stimulated allogeneic B cells. Cytolysis was mediated by the induction of tumor cell apoptosis by CD8+ T cells via the perforin-granzyme pathway. Although we were able to generate anti–leukemia-specific CTL from the bone marrow, we were unable to generate such CTL from the peripheral blood of these patients. These studies show that antigen-specific CTL can be generated from the bone marrow of patients with pre-B–cell leukemias and these findings should facilitate the design of adoptive T-cell–mediated immunotherapy trials for the treatment of patients with B-cell precursor malignancies." @default.
• W185283559 created "2016-06-24" @default.
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• W185283559 date "1997-07-15" @default.
• W185283559 modified "2023-10-03" @default.
• W185283559 title "Ex Vivo Generation of Human Anti–Pre-B Leukemia-Specific Autologous Cytolytic T Cells" @default.
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• W185283559 doi "https://doi.org/10.1182/blood.v90.2.549" @default.
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