Abstract
CAR-T therapy has shown successful in the treatment of certain types of hematological malignancy, while the efficacy of CAR-T cell in treating solid tumors has been limited due to the exhaustion of CAR-T caused by the tumor microenvironment in solid tumors. Therefore, improving the exhaustion of CAR-T cell is one of the inspiring strategies for CAR-T treatment of solid tumors. As an important regulator in T cell immunity, the transcription factor RUNX3 not only negatively regulates the terminal differentiation T-bet gene, reducing the ultimate differentiation of T cells, but also increases the residency of T cells in non-lymphoid tissues and tumors. By overexpressing RUNX3 in CAR-T cells, we found that increasing the expression of RUNX3 maintained the low differentiation of CAR-T cells, further improving the exhaustion of CAR-T cells during antigen stimulation. In vitro, we found that RUNX3 could reduce the release of cytokines while maintaining CAR-T cells function. In re-challenge experiments, CAR-T cells overexpressing RUNX3 (Runx3-OE CAR-T) were safer than conventional CAR-T cells, while RUNX3 could also maintain the anti-tumor efficacy of CAR-T cells in vivo. Collectively, we found that Runx3-OE CAR-T cells can improve CAR-T phenotype and reduce cytokines release while maintaining CAR-T cells function, which may improve the safety of CAR-T therapy in clinical trials.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This work is supported by grants from the National Natural Science Foundation of China (81903157, to CC. Zhang.)
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Cheng Qian and Chengcheng Zhang designed the research study. Xiuxiu Zhu performed the research. Wuling Li and Jiadong Gao conducted the flow cytometry tests. Junjie Shen and Yanmin Xu cultivated CAR-T cells. Xiuxiu Zhu wrote the paper.
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The CAR-T cells and detection methods of this experiment came from Chongqing Institute of Precision Medicine and Biotechnology Co., Ltd. The authors declare no conflict interests.
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Zhu, X., Li, W., Gao, J. et al. RUNX3 improves CAR-T cell phenotype and reduces cytokine release while maintaining CAR-T function. Med Oncol 40, 89 (2023). https://doi.org/10.1007/s12032-022-01913-7
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DOI: https://doi.org/10.1007/s12032-022-01913-7