Triple-negative breast cancer (TNBC) is a very aggressive malignant type of tumor that currently lacks effective targeted therapies. In hematological malignancies, chimeric antigen receptor T (CAR-T) cells have shown very significant antitumor ability; however, in solid tumors, the efficacy is poor. In order to apply CAR-T cells in the treatment of TNBC, in this study, constitutively activated IL-7 receptor (C7R) that has been reported is used to enhance the antitumor function of constructed CAR-T cells by ourselves. Using in vitro coincubation experiments with target cells and in vivo antitumor experiments in mice, we found that the coexpressed C7R can significantly improve the activation, cell proliferation, and cytotoxicity of CAR-T cells. In addition, the in vivo experiments suggested that the enhanced CAR-T cells displayed significant antitumor activity in a TNBC subcutaneous xenograft model, in which in vivo, the survival time of CAR-T cells was prolonged. Together, these results indicated that CAR-T cells that coexpress C7R may be a novel therapeutic strategy for TNBC.
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