Switching CAR T cells on and off: a novel modular platform for retargeting of T cells to AML blasts

Blood Cancer Journal - Tập 6 Số 8 - Trang e458-e458
Marc Cartellieri1, Anja Feldmann1, Stefanie Koristka1, Claudia Arndt1, Simon Loff1, Armin Ehninger2, Malte von Bonin3, Elham Pishali Bejestani3, Gerhard Ehninger2, Michael Bachmann4
1University Cancer Center (UCC), Carl Gustav Carus University Hospital TU-Dresden, Tumorimmunology, Dresden, Germany
2GEMoaB Monoclonals GmbH, Dresden, Germany
3University Hospital Carl Gustav Carus, Medical Clinic and Policlinic I, Dresden, Germany
4Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Dresden, Germany

Tóm tắt

AbstractThe adoptive transfer of CD19-specific chimeric antigen receptor engineered T cells (CAR T cells) resulted in encouraging clinical trials in indolent B-cell malignancies. However, they also show the limitations of this fascinating technology: CAR T cells can lead to even life-threatening off-tumor, on-target side effects if CAR T cells crossreact with healthy tissues. Here, we describe a novel modular universal CAR platform technology termed UniCAR that reduces the risk of on-target side effects by a rapid and reversible control of CAR T-cell reactivity. The UniCAR system consists of two components: (1) a CAR for an inert manipulation of T cells and (2) specific targeting modules (TMs) for redirecting UniCAR T cells in an individualized time- and target-dependent manner. UniCAR T cells can be armed against different tumor targets simply by replacement of the respective TM for (1) targeting more than one antigen simultaneously or subsequently to enhance efficacy and (2) reducing the risk for development of antigen-loss tumor variants under treatment. Here we provide ‘proof of concept’ for retargeting of UniCAR T cells to CD33- and/or CD123-positive acute myeloid leukemia blasts in vitro and in vivo.

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