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2016 ; 6
(8
): e458
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Switching CAR T cells on and off: a novel modular platform for retargeting of T
cells to AML blasts
#MMPMID27518241
Cartellieri M
; Feldmann A
; Koristka S
; Arndt C
; Loff S
; Ehninger A
; von Bonin M
; Bejestani EP
; Ehninger G
; Bachmann MP
Blood Cancer J
2016[Aug]; 6
(8
): e458
PMID27518241
show ga
The 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.