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Chu, J; Deng, Y; Benson, D M; He, S; Hughes, T; Zhang, J; Peng, Y; Mao, H; Yi, L; Ghoshal, K; He, X; Devine, S M; Zhang, X; Caligiuri, M A; Hofmeister, C C; Yu, J
Leukemia, 04/2014, Volume: 28, Issue: 4Journal Article
Multiple myeloma (MM) is an incurable hematological malignancy. Chimeric antigen receptor (CAR)-expressing T cells have been demonstrated successfully in the clinic to treat B-lymphoid malignancies. However, the potential utility of antigen-specific CAR-engineered natural-killer (NK) cells to treat MM has not been explored. In this study, we determined whether CS1, a surface protein that is highly expressed on MM cells, can be targeted by CAR NK cells to treat MM. We successfully generated a viral construct of a CS1-specific CAR and expressed it in human NK cells. In vitro, CS1-CAR NK cells displayed enhanced MM cytolysis and interferon-γ (IFN-γ) production, and showed a specific CS1-dependent recognition of MM cells. Ex vivo, CS1-CAR NK cells also showed similarly enhanced activities when responding to primary MM tumor cells. More importantly, in an aggressive orthotopic MM xenograft mouse model, adoptive transfer of NK-92 cells expressing CS1-CAR efficiently suppressed the growth of human IM9 MM cells and also significantly prolonged mouse survival. Thus, CS1 represents a viable target for CAR-expressing immune cells, and autologous or allogeneic transplantation of CS1-specific CAR NK cells may be a promising strategy to treat MM.
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