USP10对KLF4蛋白的调控及对肝细胞癌侵袭的影响  

Regulation of KLF4 protein by USP10 and its effect on hepatocellular carcinoma invasion

作　　者：陆路 黎东明 王学国 冉博 王太成 赵红岩 李鹏 Lu Lu;Li Dongming;Wang Xueguo;Ran Bo;Wang Taicheng;Zhao Hongyan;Li Peng(Dept of Hepatobiliary Pancreatic Surgery,The Second Affiliated Hospital of Hainan Medical College,Haikou 570100)

机构地区：[1]海南医学院第二附属医院肝胆胰腺外科,海口570100

出　　处：《安徽医科大学学报》2024年第7期1181-1187,共7页Acta Universitatis Medicinalis Anhui

基　　金：海南省基础与应用基础研究计划项目(编号:821MS0833)。

摘　　要：目的探究泛素特异蛋白酶10(USP10)对肝细胞癌(HCC)中Krüppe样因子4(KLF4)蛋白的调控及对HCC细胞增殖与侵袭的影响。方法采用Western blot实验检测USP10和KLF4在人正常肝细胞系L02和HCC细胞系HepG2、HUH7、HCCLM3等中的表达差异。选取HCCLM3和HUH7细胞,将过表达或沉默USP10的慢病毒颗粒(oe-USP10或sh-USP10)转染入细胞中,并将其记为oe-USP10组和oe-NC组。免疫共沉淀(Co-IP)实验检测HCCLM3或HUH7细胞中USP10是否可与KLF4直接结合。加入蛋白酶体抑制剂MG132,再次使用Co-IP检测转染oe-USP10或sh-USP10的HCCLM3和HUH7细胞中KLF4蛋白的泛素化水平。将过表达KLF4的pcDNA3.1载体质粒及其阴性对照质粒(pc-KLF4或pc-NC)共转染入HCCLM3和HUH7的sh-USP10组或sh-NC组细胞中,并将细胞记为sh-NC+pc-NC组、sh-USP10+pc-NC组、sh-NC+pc-KLF4组和sh-USP10+pc-KLF4组,采用CCK-8法检测HCCLM3和HUH7中各组细胞的增殖活力,Transwell实验检测各组细胞的侵袭能力。结果与L02细胞比较,USP10和KLF4在HepG2、HUH7、HCCLM3等细胞中蛋白表达均降低(P<0.05)。在HCCLM3和HUH7细胞中,USP10蛋白可直接与KLF4相互结合。同时,MG132处理后,HCCLM3和HUH7细胞中KLF4蛋白表达量呈时间依赖性增加。沉默USP10可增加HCCLM3与HUH7细胞中KLF4的泛素化,过表达USP10可降低上述细胞中KLF4的泛素化水平。与sh-NC+pc-NC组比较,sh-USP10+pc-NC组中HCCLM3和HUH7的增殖和侵袭能力均升高(P<0.01),而sh-NC+pc-KLF4组和sh-USP10+pc-KLF4组的HCCLM3或HUH7细胞增殖和侵袭能力均降低(P<0.05);与sh-USP10+pc-NC组比较,sh-USP10+pc-KLF4组细胞的增殖和侵袭能力均降低(P<0.05)。结论在HCC细胞中USP10通过去泛素化促进KLF4蛋白稳定性,进而抑制肿瘤细胞的增殖与侵袭。Objective To investigate the regulatory role of ubiquitin-specific protease 10(USP10)on the protein expression of Krüppel-like factor 4(KLF4)and its impact on the proliferation and invasion ability of hepatocellular carcinoma(HCC)cells.Methods The protein expression differences of USP10 and KLF4 in normal liver cell line L02 and HCC cell lines,including HepG2,HUH7,HCCLM3 were detected by immunoblotting(Western blot)methods.HCCLM3 and HUH7 cells were selected,and lentiviral particles overexpressing or silencing USP10(oe-USP10 or sh-USP10)was transfected into the cells,and they were designated as the oe-USP10 group and oe-NC group,respectively.Immunoprecipitation(Co-IP)experiments were conducted to examine whether USP10 could directly interact with KLF4 in HCCLM3 or HUH7 cells.The Co-IP assay was repeated in HCC cells transfected with oe-USP10 or sh-USP10,with the addition of the proteasome inhibitor MG132,which used to detect the ubiquitination level of KLF4 protein in the transfected HCC cells.The pcDNA3.1 vector containing overexpressed KLF4 or its negative control plasmid(pc-KLF4 or pc-NC)was co-transfected into cells of the sh-USP10 group or sh-NC group.These cells were designated as the sh-NC+pc-NC group,sh-USP10+pc-NC group,sh-NC+pc-KLF4 group,and sh-USP10+pc-KLF4 group.The cell proliferation activity of each group was measured using the CCK-8 assay,and the cell invasion ability was assessed using the Transwell assay.Results Compared to L02 cells,the protein expression of USP10 and KLF4 significantly decreased in HepG2,HUH7,HCCLM3,and other cells(P<0.05).In HCCLM3 and HUH7 cells,USP10 protein directly interacted with KLF4.Furthermore,treatment with MG132 resulted in a time-dependent increase in KLF4 protein expression in HCCLM3 and HUH7 cells.Silencing USP10 increased the ubiquitination of KLF4 in HCCLM3 or HUH7 cells,while overexpressing USP10 decreased the ubiquitination level of KLF4 in cells.Compared to the sh-NC+pc-NC group,both the proliferation activity and invasion ability of HCCLM3 and HUH7 cells s

关 键 词：肝细胞癌 泛素特异蛋白酶10 去泛素化 Krüppe样因子4 

分 类 号：R392.12[医药卫生—免疫学] R735.7[医药卫生—基础医学]