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- W2912263706 abstract "Programmed cell death ligand 1 (PD-L1) on tumor cells suppresses anti-tumor immunity and has an unfavorable prognostic impact in ovarian cancer patients. We herein report the pathophysiological and therapeutic impacts of PD-L1 disruption in ovarian cancer. PD-L1 was genetically disrupted in the murine ovarian cancer cell line ID8 using clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9-mediated genome editing. PD-L1 knockout (KO) and control ovarian cancer cells were intraperitoneally inoculated into syngeneic mice, and survival and tumor dissemination were evaluated. Survival times were significantly longer in the PD-L1-KO ID8-inoculated groups than in their control groups, and its therapeutic benefit was enhanced in combination with the cisplatin treatment. Tumor weights and ascites volumes were significantly lower in the PD-L1-KO ID8 groups than in their control groups. Immunohistochemical and immunofluorescence analyses showed that intratumoral CD4+ T cells, CD8+ T cells, NK cells and CD11c+ M1 macrophages were significantly increased, whereas regulatory T cells were significantly decreased in the PD-L1-KO ID8 groups compared with those in their control groups. The intratumoral mRNA expression of interferon-γ, tumor-necrosis factor-α, interleukin (IL)-2, IL-12a, CXCL9 and CXCL10 was significantly stronger, while that of IL-10, vascular endothelial growth factor, CXCL1 and CXCL2 was significantly weaker in the PD-L1-KO ID8 groups. These results indicate that CRISPR/Cas9-mediated PD-L1 disruption on tumor cells promotes anti-tumor immunity by increasing tumor-infiltrating lymphocytes and modulating cytokine/chemokine profiles within the tumor microenvironment, thereby suppressing ovarian cancer progression. These results suggest that PD-L1-targeted therapy by genome editing may be a novel therapeutic strategy for ovarian cancer." @default.
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- W2912263706 date "2019-02-27" @default.
- W2912263706 modified "2023-10-17" @default.
- W2912263706 title "Programmed cell death ligand 1 <scp>d</scp> isruption by <scp>clustered regularly interspaced short palindromic repeats</scp> /Cas9‐genome editing promotes antitumor immunity and suppresses ovarian cancer progression" @default.
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- W2912263706 doi "https://doi.org/10.1111/cas.13958" @default.
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