title: NK cells are the crucial antitumor mediators when STAT3-mediated immunosuppression is blocked in hepatocellular carcinoma.
abstract: STAT3 is highly activated in a wide variety of cancers and functions to promote tumor survival. We previously reported that blocking STAT3 activation inhibited human hepatocellular carcinoma (HCC) growth in vitro, but whether this treatment also triggered antitumor immune responses in vivo remained unknown. In this study, we found that blocking the STAT3 pathway in HCC cells dramatically inhibited murine HCC growth in vivo and prolonged survival of tumor-bearing mice. Importantly, the presence of STAT3-blocked HCC augmented NK cell cytotoxicity against HCC and increased expression of molecules associated with NK cell activation and cytotoxicity. In T cell-deficient nude mice, a unique NK cell-mediated antitumor function against STAT3-blocked HCC was suggested. NK cells were shown to be necessary and sufficient in NK or T cell depletion experiments, or by adoptively transferring NK cells. Furthermore, regulatory T cells and immunosuppressive IL-10 and TGF-β cytokines were reduced in mice bearing STAT3-blocked HCC cells, suggesting that these factors may be involved in HCC-induced NK cell suppression. These findings indicate that blocking STAT3 in HCC cells can initiate innate immunity in vivo.
authors.affiliation: Institute of Immunopharmacology and Immunotherapy, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China; and.
authors.forename: Qiangjun
authors.initials: Q
authors.lastname: Sui
authors.affiliation: Institute of Immunopharmacology and Immunotherapy, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China; and zhangj65@sdu.edu.cn tzg@ustc.edu.cn.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Institute of Immunopharmacology and Immunotherapy, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China; and.
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Sun
authors.affiliation: Institute of Immunopharmacology and Immunotherapy, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China; and.
authors.forename: Cai
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Institute of Immunopharmacology and Immunotherapy, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China; and.
authors.forename: Qiuju
authors.initials: Q
authors.lastname: Han
authors.affiliation: Institute of Immunopharmacology and Immunotherapy, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China; and Institute of Immunology, School of Life Sciences, University of Science and Technology of China, Hefei 230027, China zhangj65@sdu.edu.cn tzg@ustc.edu.cn.
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Tian
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000276:immunology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D007108:Immune Tolerance / Q000276:immunology*; D007113:Immunity, Innate; D016753:Interleukin-10 / Q000096:biosynthesis; D007694:Killer Cells, Natural / Q000276:immunology* / Q000637:transplantation; D008113:Liver Neoplasms / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology; D008212:Lymphocyte Depletion; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D009838:Oligodeoxyribonucleotides / Q000494:pharmacology; D050796:STAT3 Transcription Factor / Q000037:antagonists & inhibitors* / Q000235:genetics; D050378:T-Lymphocytes, Regulatory / Q000276:immunology; D016212:Transforming Growth Factor beta / Q000096:biosynthesis
chemical_list: C556062:IL10 protein, mouse; D009838:Oligodeoxyribonucleotides; D050796:STAT3 Transcription Factor; C494087:Stat3 protein, mouse; D016212:Transforming Growth Factor beta; D016753:Interleukin-10