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- W4377263775 abstract "Acute myeloid leukemia (AML) is a highly heterogeneous neoplastic disease with a poor prognosis that relapses even after its treatment with chimeric antigen receptor (CAR)-T cells targeting a single antigen. CD123 and CLL1 are expressed in most AML blasts and leukemia stem cells, and their low expression in normal hematopoietic stem cells makes them ideal targets for CAR-T. In this study, we tested the hypothesis that a new bicistronic CAR targeting CD123 and CLL1 can enhance antigenic coverage and prevent antigen escape and subsequent recurrence of AML. CD123 and CLL1 expressions were evaluated on AML cell lines and blasts. Then, in addition to concentrating on CD123 and CLL1, we introduced the marker/suicide gene RQR8 with a bicistronic CAR. Xenograft models of disseminated AML and in vitro coculture models were used to assess the anti-leukemia efficacy of CAR-T cells. The hematopoietic toxicity of CAR-T cells was evaluated in vitro by colony cell formation assays. It was demonstrated in vitro that the combination of rituximab and NK cells caused RQR8-mediated clearance of 123CL CAR-T cells. We have successfully established bicistronic 123CL CAR-T cells that can target CD123 and CLL1. 123CL CAR-T cells effectively cleared AML cell lines and blasts. They also demonstrated appreciable anti-AML activity in animal transplant models. Moreover, 123CL CAR-T cells can be eliminated in an emergency by a natural safety switch and don't target hematopoietic stem cells. The bicistronic CAR-T cells targeting CD123 and CLL1 may be a useful and secure method for treating AML." @default.
- W4377263775 created "2023-05-23" @default.
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- W4377263775 date "2023-08-01" @default.
- W4377263775 modified "2023-10-16" @default.
- W4377263775 title "Bicistronic CAR-T cells targeting CD123 and CLL1 for AML to reduce the risk of antigen escape" @default.
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- W4377263775 doi "https://doi.org/10.1016/j.tranon.2023.101695" @default.
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