乙型肝炎病毒表面抗原大蛋白致HepG2细胞凋亡的蛋白质组学分析

目的 研究乙型肝炎病毒(hepatitits B virus,HBV)表面抗原大蛋白(large envelope protein,LHB)对HepG2细胞凋亡的影响,并以蛋白质组学方法探讨其机制.方法 以腺病毒表达载体pShuttle-IRES-hrGFP-1克隆HBV LHB基因,经重组、包装后获得重组腺病毒Ad-LHB,与空载体重组腺病毒Ad-GFP分别感染HepG2细胞,采用Annexin V-FITC细胞凋亡检测试剂盒、JC-1细胞凋亡线粒体膜电位检测试剂盒和碘化丙啶(PI)染色检测细胞凋亡情况.Ad-LHB及Ad-GFP分别感染HepG2细胞,提取细胞总蛋白,各取600μg蛋白样品进行双相电泳,R350染色,以双相电泳图像分析软件ImageMaster 2D Platinum确定差异蛋白点,Ettan斑点自动挖胶系统切取差异蛋白,脱色酶解后进行MALDI-TOF-TOF MS鉴定并分析.结果 Ad-LHB感染导致HepG2细胞凋亡明显增加.双向电泳及扫描分析显示Ad-LHB与Ad-GFP感染的HepG2细胞共有39个蛋白差异.质谱分析并确定其中的33种共36个蛋白,这些差异蛋白质有9种与细胞凋亡密切相关,其中,CAPN2、eIF3K和PPP2CB在Ad-LHB感染HepG2细胞表达增高,SERPINH1、LASP1、PRDX1、DHRS2、LDHA和PSMA4在Ad-LHB感染HepG2细胞表达降低.结论 HBV LHB可致HepG2细胞凋亡,多种细胞凋亡相关蛋白参与此过程.

Proteomics analysis of the apoptotic effects of hepatitis B virus large envelope protein on HepG2 cells

Objective To assess the effects of hepatitis B virus(HBV) large envelope protein (LHB) on the apoptosis of HepG2 cells and explore the possible mechanism by proteomic approaches.Methods LHB gene was cloned into pShuttle-IRES-hrGFP-1,and the recombinant adenovirus either barboring LHB(Ad-LHB) or empty vector(Ad-GFP) were separately generated.Annexin V-FITC apoptosis detection kit,JC-1 mitochondrial membrane potential assay kit and propidium iodide(PI) staining kit were employed combined with flow cytometry to detect the apoptotic cells infected with Ad-LHB or control of Ad-GFP.The cellular proteins were collected after infection of HepG2 cells by Ad-LHBs or Ad-GFP,and a total of 600 μg proteins were submitted to two-dimensional gel electrophoresis(2-DE) and stained with R350.The gel images were captured by ImageScanner Ⅱ Imaging System,the differentially expressed proteins were identified by ImageMaster 2D Platinum analysis software and picked up by Ettan Spot Picker.After enzyme digestion,the protein samples were analyzed by MALDI-TOF-TOF MS.Results HepG2 cells infected with Ad-LHB were much more prone to apoptosis.There were thirty nine differentially expressed proteins were determined by 2-DE between HepG2 cells infected with Ad-LHB and Ad-GFP,and they were identified ultimately and categorized into thirty three kinds of proteins by MALDI-TOF-TOF MS.Among these proteins,nine were found to be closely related to cell apoptosis,in which CAPN2,eIF3K and PPP2CB were higher expressed in Ad-LHB infected HepG2 cells,and SERPINH1,LASP1,PRDX1,DHRS2,LDHA and PS-MA4 were lower expressed in Ad-LHB infected HepG2 cells.Conclusion LHB could induce apoptosis of HepG2 cells,and several apoptosis-related proteins participated in this process.