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Aim: To determine if silencing PD-1 on tumor-infiltrating lymphocytes (TILs) and its ligand-1 (PD-L1) on cancer cells will enhance the cytotoxicity of TILs. Materials &amp; methods: Lipid-coated calcium phosphate nanoparticles were synthesized to deliver siRNAs against PD-1 and PD-L1 to TILs and breast cancer MCF-7 cells. The downregulation of PD-1/PD-L1 expressions was determined by real-time PCR and western blotting assays. The killing efficacy of TILs to MCF-7 cells was determined by cytotoxic T lymphocyte assay. Results: Lipid-coated calcium phosphate nanoparticles effectively delivered siRNAs and silenced PD-1 and PD-L1sh expression. The knockdown of either gene or both greatly improved the cytotoxicity of TILs. Conclusion: Silencing PD-1 and PD-L1 is an effective approach to increase TIL cytotoxicity to cancer cells.

Silencing PD-1 and PD-L1 with nanoparticle-delivered small interfering RNA increases cytotoxicity of tumor-infiltrating lymphocytes