Biomedical Science Letters (대한의생명과학회지)

The Korean Society for Biomedical Laboratory Sciences (대한의생명과학회)
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PD-L1 Targeted Immunoliposomes with PD-L1 siRNA and HDAC Inhibitor for Anti-Lung Cancer Immunotherapy

  • Se-Yun, Hong (Department of Biomedical Laboratory Science, Konyang University) ;
  • Seong-Min, Lee (Department of Biomedical Laboratory Science, Konyang University) ;
  • Pyung-Hwan, Kim (Department of Biomedical Laboratory Science, Konyang University) ;
  • Keun-Sik, Kim (Department of Biomedical Laboratory Science, Konyang University)
  • Received : 2022.10.14
  • Accepted : 2022.11.28
  • Published : 2022.12.31
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Abstract

Immunotherapy, which uses an immune mechanism in the body, has received considerable attention for cancer treatment. Suberoylanilide hydroxamic acid (SAHA), also known as a histone deacetylase inhibitor (HDACi), is used as a cancer treatment to induce active immunity by increasing the expression of T cell-induced chemokines. However, this SAHA treatment has the disadvantage of causing PD-L1 overexpression in tumor cells. In this study, we prevented PD-L1 overexpression by blocking the PD-1/PD-L1 pathway using PD-L1 siRNA. We designed two types of liposomes, the neutral lipid 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholin (POPC) for SAHA, and 1,2-dioleoyl-3-trimethylammoniumpropane (DOTAP) for siRNA. To effectively target PD-L1 in cancer cells, we conjugated PD-L1 antibody with liposomes containing SAHA or PD-L1 siRNA. These immunoliposomes were also evaluated for cytotoxicity, gene silencing, and T-cell-induced chemokine expression in human non-small cell lung cancer A549 cells. It was confirmed that the combination of the two immunoliposomes increased the cancer cell suppression efficacy through Jurkat T cell induction more than twice compared to SAHA alone treatment. In conclusion, this combination of immunoliposomes containing a drug and nucleic acid has promising therapeutic potential for non-small-cell lung carcinoma (NSCLC).

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF-2021R1F1A1062932).

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