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In The Literature: A Promising New Antigen Target in Multiple Myeloma
Methods
We generated a retroviral construct of a CS1-specific CAR and engineered primary human T cells expressing the CAR. We then tested the capacity of CS1-CAR T cells to eradicate human multiple myeloma tumor cells in vitro, ex vivo and in vivo using orthotopic MM xenograft mouse models.
Results: In vitro, compared to mock-transduced T cells, upon recognizing CS1 positive MM cells, CS1-CAR-tranduced T cells secreted more IFN-γ as well as IL-2, expressed higher levels of the activation marker CD69, showed higher capacity for degranulation, and displayed enhanced cytotoxicity. Ectopically forced expression of CS1 in MM cells with low CS1 expression enhanced recognition and killing by CAR T cells. Ex vivo, CS1-CAR T cells also showed similarly enhanced activities when responding to primary MM cells. More importantly, in orthotopic MM xenograft mouse models, adoptive transfer of human primary T cells expressing CS1-CAR efficiently suppressed the growth of human MM.1S and IM9 myeloma cells and significantly prolonged mouse survival.
Conclusions: CS1 is a promising antigen that can be targeted by CAR-expressing T cells for treatment of MM.
Souce: Clinical Cancer Research
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