title: HAb18G/CD147 promotes radioresistance in hepatocellular carcinoma cells: a potential role for integrin β1 signaling.
abstract: Radiotherapy has played a limited role in the treatment of hepatocellular carcinoma (HCC) due to the risk of tumor radioresistance. A previous study in our laboratory confirmed that CD147 interacts with integrin β1 and plays an important role in modulating the malignant properties of HCC cells. In this study, we further evaluated the role of CD147 in the radioresistance of HCC and as a potential target for improving radiosensitivity. Upon irradiation, the colony formation, apoptosis, cell-cycle distribution, migration, and invasion of SMMC-7721, CD147-knockout SMMC-7721, HepG2, and CD147-knockdown HepG2 cells were determined. A nude mouse xenograft model and a metastatic model of HCC were used to detect the role of CD147 in radioresistance in vivo. Deletion of HAb18G/CD147 significantly enhanced the radiosensitivity of SMMC-7721 and HepG2 cells, and knocking out HAb18G/CD147 in SMMC-7721 cells attenuated irradiation-enhanced migration and invasion. The knockout and antibody blockade of CD147 decreased the tumor growth and metastatic potentials of HCC cells under irradiation. CD147-deleted SMMC-7721 cells showed diminished levels of calpain, cleaved talin, active integrin β1, and decreased p-FAK (Tyr397) and p-Akt (Ser473) levels. FAK and PI3K inhibitors, as well as integrin β1 antibodies, increased the radiation-induced apoptosis of SMMC-7721 cells. Our data provide evidence for CD147 as an important determinant of radioresistance via the regulation of integrin β1 signaling. Inhibition of the HAb18G/CD147 integrin interaction may improve the efficiency of radiosensitivity and provide a potential new approach for HCC therapy.
authors.affiliation: Cell Engineering Research Center and Department of Cell Biology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China.
authors.forename: Jiao
authors.initials: J
authors.lastname: Wu
authors.affiliation: Cell Engineering Research Center and Department of Cell Biology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China. Department of Oncology, PLA 323 Hospital, Xi'an, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Oncology, PLA 323 Hospital, Xi'an, China.
authors.forename: Ya-Zheng
authors.initials: YZ
authors.lastname: Dang
authors.affiliation: Department of Oncology, PLA 323 Hospital, Xi'an, China.
authors.forename: Hong-Xiang
authors.initials: HX
authors.lastname: Gao
authors.affiliation: Cell Engineering Research Center and Department of Cell Biology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China. jiangjl@fmmu.edu.cn znchen@fmmu.edu.cn.
authors.forename: Jian-Li
authors.initials: JL
authors.lastname: Jiang
authors.affiliation: Cell Engineering Research Center and Department of Cell Biology, State Key Laboratory of Cancer Biology, Fourth Military Medical University, Xi'an, China. jiangjl@fmmu.edu.cn znchen@fmmu.edu.cn.
authors.forename: Zhi-Nan
authors.initials: ZN
authors.lastname: Chen
mesh_terms: D000818:Animals; D017209:Apoptosis; D051926:Basigin / Q000378:metabolism*; D063646:Carcinogenesis / Q000473:pathology; D006528:Carcinoma, Hepatocellular / Q000098:blood supply / Q000378:metabolism* / Q000473:pathology; D002465:Cell Movement; D002470:Cell Survival; D017353:Gene Deletion; D056945:Hep G2 Cells; D006801:Humans; D019012:Integrin beta1 / Q000378:metabolism*; D008113:Liver Neoplasms / Q000098:blood supply / Q000378:metabolism* / Q000473:pathology; D008819:Mice, Nude; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis; D009389:Neovascularization, Pathologic / Q000378:metabolism; D011836:Radiation Tolerance; D015398:Signal Transduction; D014410:Tumor Stem Cell Assay; D015854:Up-Regulation; D014965:X-Rays; D023041:Xenograft Model Antitumor Assays
chemical_list: D019012:Integrin beta1; D051926:Basigin