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Huang, Kuan-Wei; Hsu, Fu-Fei; Qiu, Jiantai Timothy; Chern, Guann-Jen; Lee, Yi-An; Chang, Chih-Chun; Huang, Yu-Ting; Sung, Yun-Chieh; Chiang, Cheng-Chin; Huang, Rui-Lin; Lin, Chu-Chi; Dinh, Trinh Kieu; Huang, Hsi-Chien; Shih, Yu-Chuan; Alson, Donia; Lin, Chun-Yen; Lin, Yung-Chang; Chang, Po-Chiao; Lin, Shu-Yi; Chen, Yunching
Science advances, 01/2020, Volume: 6, Issue: 3Journal Article
While immunotherapy holds great promise for combating cancer, the limited efficacy due to an immunosuppressive tumor microenvironment and systemic toxicity hinder the broader application of cancer immunotherapy. Here, we report a combinatorial immunotherapy approach that uses a highly efficient and tumor-selective gene carrier to improve anticancer efficacy and circumvent the systemic toxicity. In this study, we engineered tumor-targeted lipid-dendrimer-calcium-phosphate (TT-LDCP) nanoparticles (NPs) with thymine-functionalized dendrimers that exhibit not only enhanced gene delivery capacity but also immune adjuvant properties by activating the stimulator of interferon genes (STING)-cGAS pathway. TT-LDCP NPs delivered siRNA against immune checkpoint ligand PD-L1 and immunostimulatory IL-2-encoding plasmid DNA to hepatocellular carcinoma (HCC), increased tumoral infiltration and activation of CD8 T cells, augmented the efficacy of cancer vaccine immunotherapy, and suppressed HCC progression. Our work presents nanotechnology-enabled dual delivery of siRNA and plasmid DNA that selectively targets and reprograms the immunosuppressive tumor microenvironment to improve cancer immunotherapy.
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