IFN-γ Induces Gastric Cancer Cell Proliferation and Metastasis Through Upregulation of Integrin β3-Mediated NF-κB Signaling  Yuan-Hua Xu, Zheng-Li Li,

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IFN-γ Induces Gastric Cancer Cell Proliferation and Metastasis Through Upregulation of Integrin β3-Mediated NF-κB Signaling  Yuan-Hua Xu, Zheng-Li Li, Sheng-Feng Qiu  Translational Oncology  Volume 11, Issue 1, Pages 182-192 (February 2018) DOI: 10.1016/j.tranon.2017.11.008 Copyright © 2017 The Authors Terms and Conditions

Figure 1 IFN-γ enhances proliferation and inhibits apoptosis in gastric cells. (A) SGC-7901 and MGC-803 cells were treated with different concentrations of IFN-γ for 24hours and then assayed by CCK-8. (B) SGC-7901 and MGC-803 cell apoptosis was determined by flow cytometry analysis. Quantitative results for apoptosis cell rates are shown. Bars indicate the mean±SEM, ⁎P<.05 versus control group. Translational Oncology 2018 11, 182-192DOI: (10.1016/j.tranon.2017.11.008) Copyright © 2017 The Authors Terms and Conditions

Figure 2 IFN-γ promotes gastric cell migration and invasion. (A) Migrated cells were counted in nine random fields from each treatment. The photographs were taken at the magnification of ×40. Quantitative results for wound healing data are shown. (B) The invasion ability of cells was quantified by counting the number of cells that invaded the underside of the porous polycarbonate membrane. The photographs were taken at the magnification of ×200. Quantitative results for invasion data are shown. (C) Western blots were performed to detect protein levels of MMP-2 and MMP-9. GAPDH was used as a control. Bars indicate the mean±SEM, ⁎P<.05 versus control group. Translational Oncology 2018 11, 182-192DOI: (10.1016/j.tranon.2017.11.008) Copyright © 2017 The Authors Terms and Conditions

Figure 3 IFN-γ activates NF-κB signaling pathway and dose-dependently upregulates integrin β3. (A) Western blots were performed to detect protein levels of NF-κB along with their phosphorylation. GAPDH was used as a control. (B) Immunofluorescence assay was used to detect the translocation of NF-κB/ p65. The photographs were taken at the magnification of ×200. Quantitative results for relative nuclear mRNA level are shown. (C) The expression of integrin β3 was detected by Western blots. GAPDH was used as a control. Bars indicate the mean±SEM, ⁎P<.05 versus control group. Translational Oncology 2018 11, 182-192DOI: (10.1016/j.tranon.2017.11.008) Copyright © 2017 The Authors Terms and Conditions

Figure 4 IFN-γ enhances proliferation, migration, and invasion and inhibits apoptosis partially through the upregulation of integrin β3. SGC-7901 cells were transfected with integrin β3 siRNA or nonspecific control siRNA. (A) The mRNA level of integrin β3 was experimented by qRT-PCR. GAPDH was used as a control. (B) CCK-8 assay was performed to determine cell viability. (C) Cell apoptosis was determined by flow cytometry analysis. Quantitative results for apoptosis cell rates are shown. (D) Migrated cells were counted in nine random fields from each treatment. The photographs were taken at the magnification of ×40. Quantitative results for wound healing data are shown. (E) The invasion ability of cells was quantified by counting the number of cells that invaded the underside of the porous polycarbonate membrane. The photographs were taken at the magnification of ×200. Quantitative results for invasion data are shown. (F) Western blots were performed to detect protein levels of integrin β3, MMP-2, and MMP-9. GAPDH was used as a control. Bars indicate the mean±SEM, #P<.05 versus control group, ⁎P<.05 versus integrin β3 siRNA group. Translational Oncology 2018 11, 182-192DOI: (10.1016/j.tranon.2017.11.008) Copyright © 2017 The Authors Terms and Conditions

Figure 5 IFN-γ activates NF-κB signaling pathway partially through the upregulation of integrin β3. SGC-7901 cells were transfected with integrin β3 siRNA or nonspecific control siRNA. (A) Western blots were performed to detect protein levels of NF-κB along with their phosphorylation. GAPDH was used as a control. (B) Immunofluorescence assay was used to detect the translocation of NF-κB/ p65. The photographs were taken at the magnification of ×200. Quantitative results for relative nuclear mRNA level are shown. Bars indicate the mean±SEM, #P<.05 versus control group, ⁎P<.05 versus integrin β3 siRNA group. Translational Oncology 2018 11, 182-192DOI: (10.1016/j.tranon.2017.11.008) Copyright © 2017 The Authors Terms and Conditions

Figure 6 IFN-γ increases tumor proliferation and inhibits cell apoptosis in mice through the upregulation of integrin β3. After the transfection with integrin β3 siRNA, different groups of SGC-7901 cells were inoculated subcutaneously into the right axilla of nude mice. All mice were sacrificed on day 28, and the tumors were obtained. (A) The tumor volume was calculated. (B) The expression of Ki-67 was determined by immunohistochemistry assay, and the TUNEL assay in tumor issue was performed. The photographs were taken at the magnification of ×200. (C) Western blots were performed to detect protein levels of integrin β3, p65, p-p65, IκBα, and p-IκBα. GAPDH was used as a control. Bars indicate the mean±SEM, #P<.05 versus control group, ⁎P<.05 versus integrin β3 siRNA group. Translational Oncology 2018 11, 182-192DOI: (10.1016/j.tranon.2017.11.008) Copyright © 2017 The Authors Terms and Conditions

Figure 7 IFN-γ promotes tumor metastasis in mice through the upregulation of integrin β3. After the transfection with integrin β3 siRNA, different groups of SGC-7901 cells were injected from tail vein; mice were sacrificed on day 21, and the lung tissues were removed and weighed. (A) The lung/total weight and tumor nodules were detected. (B) A representative histological view of the liver sections was photographed, and the expression of NF-κB/ p65 was determined by immunohistochemistry assay. The photographs were taken at the magnification of ×200. (C) Western blots were performed to detect protein levels of integrin β3, MMP-2, MMP-9, and NF-κB. GAPDH was used as a control. Bars indicate the mean±SEM, #P<.05 versus control group, ⁎P<.05 versus integrin β3 siRNA group. Translational Oncology 2018 11, 182-192DOI: (10.1016/j.tranon.2017.11.008) Copyright © 2017 The Authors Terms and Conditions