Kwak, Gijung Kirn, Dongkyu Nam, Gi-hoon Wang, Sun Young Kim, In-San Kim, Sun Hwa Kwon, Ick-Chan Yeo, Yoon 2024-01-20T00:31:28Z 2024-01-20T00:31:28Z 2021-09-05 2017-10 1936-0851 https://pubs.kist.re.kr/handle/201004/122215 Programmed cell death protein-1 (PD-1) is a prominent immune checkpoint receptor interacting with its ligand, programmed cell death protein ligand-1 (PD-L1, B7-Hi). The PD-1/PD-L1 interaction induces functional exhaustion of tumor-reactive cytotoxic T cells and, thus, interferes with antitumor T-cell immunity. In addition, PD-1/PD-L1 interaction promotes tumorigenesis via the mTOR. signaling pathway in a group of cancers including melanoma. Based on the dual functions of PD-1/PD-L1 interactions in tumor progression, we hypothesize that siRNA targeting PD-L1 (siPD-L1) will suppress melanoma growth, acting on both immune checkpoint and intrinsic tumorigenesis pathways. We tested this hypothesis by delivering siPD-L1 with a polymeric carrier ("pd") consisting of disulfide-cross-linked polyethylenimine (CLPEI) and dermatan sulfate (DS), which we previously found to have a specific interaction with CD146-positive B16F10 melanoma cells. The siPD-L1/pd suppressed the expression of PD-Ll in the interferon-gamma (IFN-gamma)-challenged B16F10 melanoma cells in a cell type dependent manner and attenuated the expression of tumor-specific genes in B16F10 cells. siPD-Ll/pd suppressed the B16F10 melanoma growth in C57BL/6 immune-competent mice with increased tumor-specific immunity. siPD-Ll/pd also suppressed melanoma growth in immune-compromised nude mice. Both animals showed a positive correlation between PD-L1 and p-S6k (a marker of mTOR pathway activation) expression in tumors. These results indicate that the siPD-L1/pd complex attenuates melanoma growth in both T-cell-dependent and independent mechanisms. English AMER CHEMICAL SOC OVARIAN-CANCER ANTITUMOR IMMUNITY SIGNALING PATHWAY PD-L1 EXPRESSION GENE DELIVERY TUMOR-GROWTH LUNG-CANCER IFN-GAMMA IN-VIVO PROGRESSION Programmed Cell Death Protein Ligand-1 Silencing with Polyethylenimine-Dermatan Sulfate Complex for Dual Inhibition of Melanoma Growth Article 10.1021/acsnano.7b04717 1 ACS NANO, v.11, no.10, pp.10135 - 10146 ACS NANO 11 10 10135 10146 scie scopus 000413992800057 2-s2.0-85033370647 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article OVARIAN-CANCER ANTITUMOR IMMUNITY SIGNALING PATHWAY PD-L1 EXPRESSION GENE DELIVERY TUMOR-GROWTH LUNG-CANCER IFN-GAMMA IN-VIVO PROGRESSION siRNA delivery polyelectrolyte carrier immune checkpoint blockade mTOR pathway PD-L1 B16F10 melanoma