Abstract
Blockade of the interaction of the immune checkpoint receptor programmed cell death protein (PD)-1 and its ligand PD-L1 has been found to be a promising cancer treatment. Our previous studies identified that nABPD1 competed with PD-L1 to bind PD-1. The aim of this study was to evaluate the efficacy and safety of anti-tumor immunotherapy of ICIK cells conjugated with peptides in vivo and in vitro. Here, we synthesized the nABPD1 derivatives SBP1 and SBP2 and showed that their binding efficiency to PD-1-positive improving cytokine-induced killer (ICIK) cells was 98 and 82%, respectively. The cytotoxicity of ICIK cells to T-cell acute lymphoblastic leukemia (T-ALL) cells was increased by conjugating with SBP1 or SBP2, which was 2 times higher than that of ICIK cells alone. Furthermore, mice experiments showed that the fluorescence intensity of leukemia cells in T-ALL xenograft models was reduced by more than 95%, indicating that the peptides enhanced the therapeutic effect in vivo, while morphological evaluations showed that the peptides had no toxicity to important organs. Therefore, peptide-cell conjugates (PCCs) may be a novel method to improve the efficacy of cancer immunotherapy by blocking PD-1 in T-ALL patients.
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Acknowledgements
We thank Yingxia Wu and Chuying Zhang (staff in the Instrument and Equipment Center, School of Life Sciences, Sun Yat-sen University, China) for their support in the process of using flow cytometry and confocal microscopy.
Funding
This research was funded by the Programs of Guangdong Science and Technology Department (No. 2016B030231001; No. 2017B020230002) and the Natural Science Foundation of China (31871413, 32100627), and the GuangDong Basic and Applied Basic Research Foundation (No. 2022A1515110025).
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Wang, Q., Huang, H., Liang, P. et al. Development of PD-1 blockade peptide-cell conjugates to enhance cellular therapies for T-cell acute lymphoblastic leukemia. Med Oncol 41, 14 (2024). https://doi.org/10.1007/s12032-023-02235-y
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DOI: https://doi.org/10.1007/s12032-023-02235-y