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2017 ; 7
(1
): 10713
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A TCR-based Chimeric Antigen Receptor
#MMPMID28878363
Walseng E
; Köksal H
; Sektioglu IM
; Fåne A
; Skorstad G
; Kvalheim G
; Gaudernack G
; Inderberg EM
; Wälchli S
Sci Rep
2017[Sep]; 7
(1
): 10713
PMID28878363
show ga
Effector T cells equipped with engineered antigen receptors specific for cancer
targets have proven to be very efficient. Two methods have emerged: the Chimeric
Antigen Receptors (CARs) and T-cell Receptor (TCR) redirection. Although very
potent, CAR recognition is limited to membrane antigens which represent around 1%
of the total proteins expressed, whereas TCRs have the advantage of targeting any
peptide resulting from cellular protein degradation. However, TCRs depend on
heavy signalling machinery only present in T cells which restricts the type of
eligible therapeutic cells. Hence, an introduced therapeutic TCR will compete
with the endogenous TCR for the signalling proteins and carries the potential
risk of mixed dimer formation giving rise to a new TCR with unpredictable
specificity. We have fused a soluble TCR construct to a CAR-signalling tail and
named the final product TCR-CAR. We here show that, if expressed, the TCR-CAR
conserved the specificity and the functionality of the original TCR. In addition,
we demonstrate that TCR-CAR redirection was not restricted to T cells. Indeed,
after transduction, the NK cell line NK-92 became TCR positive and reacted
against pMHC target. This opens therapeutic avenues combing the killing
efficiency of NK cells with the diversified target recognition of TCRs.
|Cell Line, Tumor
[MESH]
|Cytokines/metabolism
[MESH]
|Cytotoxicity, Immunologic
[MESH]
|Flow Cytometry
[MESH]
|Gene Expression
[MESH]
|Gene Order
[MESH]
|Genetic Vectors/genetics
[MESH]
|Histocompatibility Antigens Class I/immunology/metabolism
[MESH]