苦参素注射液联合顺铂对人肝癌SMMC-7721细胞凋亡相关基因c-myc、bcl-2和bax表达的影响

目的探讨苦参素注射液(MI)联合顺铂(DDP)对人肝癌SMMC-7721细胞凋亡相关基因c-myc、bcl-2和bax表达的影响。方法分别采用MI、顺铂及MI联合顺铂干预SMMC-7721细胞。TUNEL法检测细胞凋亡率,半定量RT-PCR法检测c-myc、bcl-2和bax mRNA表达,二步法免疫组化检测c-myc、bcl-2和bax蛋白表达。结果苦参素组、顺铂组和联合用药组细胞凋亡率显著上升,与对照组(不干预)比较差异有统计学意义(P<0.05或P<0.01),联合用药具有单纯相加或协同作用;联合用药组的细胞凋亡率显著增加,bax mRNA和蛋白表达显著升高,c-myc、bcl-2 mRNA和蛋白表达显著减少,与DDP单药组比较差异有统计学意义(P<0.05或P<0.01)。结论苦参素注射液联合顺铂具有单纯相加或协同诱导肝癌SMMC-7721细胞凋亡作用,其机制可能与bax基因表达上调和c-myc、bcl-2基因表达下调有关。     

质粒PLXSN介导bcl-2基因对癫痫大鼠海马神经细胞凋亡的保护作用

选择28只雄性Wistar大鼠随机分为正常对照组、生理盐水组、空质粒组和bcl-2组.24 h后用红藻氨酸(KA)局部注射诱导癫痫模型,以TUNEL方法检测凋亡细胞在大鼠海马CA3区的表达,采用免疫组织化学方法和半定量RT-PCR技术检测bcl-2蛋白及bcl-2 mRNA的表达.结果 显示,生理盐水组与空质粒组CA3区有大量凋亡细胞,给予PLXSN-bcl-2基因后凋亡细胞数明显减少.与空质粒组比较,bcl-2组海马CA3区bcl-2阳性细胞百分比及bcl-2 mRNA表达均明显升高.认为质粒PLXSN介导bcl-2基因转入脑内,对KA致癫痫大鼠海马神经元凋亡有抑制作用,起到脑保护作用.     

细胞凋亡与肠黏膜缺血再灌注损伤的关系

选择SD大鼠20只,随机分成两组,对照组和实验组各10只.实验组单纯分离肠系膜上动脉(SMA),不做阻断;实验组夹闭SMA 60 min,再灌注120 min,缺血前10 min经肠系膜上动脉注入生理盐水0.5 ml.采用HE染色观察及chiu评分法判断小肠黏膜形态学损伤程度,PCR法检测大肠杆菌易位情况,TUNEL染色检测肠黏膜上皮细胞凋亡发生率,RT-PCR法检测bax、bcl-2 mRNA表达情况,用免疫组化SP法检测bax和bcl-2蛋白的表达.发现与对照组比较,实验组肠黏膜上皮bax基因与蛋白表达显著上调,bcl-2基因与蛋白表达显著下调,肠黏膜上皮细胞凋亡指数显著升高,肠黏膜组织损伤严重,chiu评分显著升高,门静脉血大肠杆菌易位率显著升高.认为肠缺血再灌注可导致肠黏膜上皮细胞bax上调、bcl-2下调,从而使蛋白相应变化,导致细胞凋亡增加;肠黏膜上皮细胞凋亡可导致肠黏膜屏障的破坏,通透性增加,细菌易位增加.     

气虚血瘀证大鼠血管平滑肌细胞bcl-2及bax相关凋亡因子的表达

目的 观察气虚血瘀证大鼠血管平滑肌细胞的凋亡及bcl-2、bax相关凋亡因子的表达.方法 采用饥饿、疲劳、寒冷、惊吓等综合因素方法复制气虚血瘀证大鼠模型,观察大鼠胸主动脉血管内膜形态学,检测血管平滑肌细胞的凋亡指数及bcl-2、bax蛋白的表达.结果 气虚血瘀大鼠血管内膜明显增殖,血管平滑肌细胞bcl-2蛋白表达增高(96.15±0.02 vs 21.13±0.05);bax蛋白表达降低(1.05±0.12 vs 68.06±0.06);bcl-2/bax增高(2.92±0.67 vs 0.01±0.01)(P<0.05).结论 气虚血瘀证大鼠存在血管平滑肌细胞增殖和凋亡严重失调等病理生理基础.     

表皮生长因子对小鼠前列腺细胞bcl-2、bax和c-myc基因表达水平的影响

目的探讨外源性表皮生长因子(EGF)对小鼠前列腺细胞bcl-2、bax和c-myc基因表达水平的影响。方法对两组各20例经不同剂量EGF处理的以及20例空白对照昆明种雄鼠前列腺标本采用流式细胞术检测细胞bcl-2、bax和c-myc基因表达水平。结果经EGF处理后,bcl-2的标记率和表达量均有明显升高(P<0.05),大剂量EGF处理后c-myc的标记率和表达量也明显升高(P<0.05),bax的表达量也有一定升高(P<0.05)。结论EGF可调控前列腺细胞bcl-2、bax和c-myc基因表达水平,促使增殖基因c-myc和抑制凋亡基因bcl-2的高表达是小鼠前列腺增生的重要原因。     

丹红对大鼠重症急性胰腺炎相关性心肌损害的防治作用

目的: 研究重症急性胰腺炎(SAP)时大鼠心肌损害和心肌组织凋亡基因表达的变化及意义,探讨中药制剂丹红注射液对SAP相关性心肌损害的防治作用.方法: SD大鼠72只随机分为正常对照组(A组,n = 24)、SAP模型对照组(B组, n = 24)和丹红治疗组(C组, n = 24). 采用腹腔注射L-Arg的方法制造SAP模型. 检测血清CTnI、CK-MB含量, 光镜、电镜下观察心肌组织的病理变化,免疫组化法检测术后6、12、18 h各时点心肌bcl-2、bax基因的表达产物.结果: 与A组相比, B组血清CTnI、CK-MB明显升高[CTnI(μg/L): 6 h: 2.18±0.07 vs 0.19±0.02, 12 h: 3.32±0.31 vs 0.21±0.05, 18 h:3.81±0.48 vs 0.20±0.08, 均P<0.05; CK-MB(U/L): 6 h: 3028.8±542.2 vs 178.0±42.2, 12 h:3511.7±1172.2 vs 176.4±39.8, 18 h:4921.2±1822.3 vs 185.2±41.6, 均P<0.05]. 与B组相比, C组血清CTnI、CK-MB也明显降低(均P<0.05). 与A组相比, B组bax表达(PU)产物明显升高(6 h: 4.58±1.07 vs 1.10±0.08, 12 h:8.02±0.31 vs 1.15±0.09, 18 h: 8.81±0.68 vs1.20±0.06, 均P<0.05); bcl-2/ bax比值明显降低(6 h: 0.55±0.11 vs 1.17±0.07, 12 h: 0.33±0.08vs 1.23±0.13, 18 h: 0.43±0.15 vs 0.98±0.19,均P<0.05). 与B组相比, C组bax表达产物明显降低; bcl-2表达产物明显升高(6 h: 3.15±0.92vs 1.25±0.16, 12 h: 4.93±0.52 vs 1.87±0.20,18 h: 4.63±0.82 vs 3.41±0.83, 均P<0.05);bcl-2/ bax比值明显升高(均P<0.05). 光镜、镜下可见SAP大鼠的心肌组织存在明显的变性、坏死等病理变化, C组心肌组织病理损伤明显减轻.结论: SAP可诱发心肌损害, 与心肌组织bcl-2基因表达降低、bax基因表达上调有关. 丹红注射液对SAP合并心脏损害的具有保护作用,其作用机制与下调bax基因在心肌组织中的表达, 上调心肌组织bcl-2基因的表达有关.     

胰岛素样生长因子-Ⅰ对重症急性胰腺炎大鼠小肠黏膜上皮细胞bax和bcl-2 mRNA表达的影响

目的:研究外源性胰岛素样生长因子-Ⅰ(insulin-like growth factor-Ⅰ,IGF-Ⅰ)对重症急性胰腺炎(severe acute pancreatitis,SAP)大鼠小肠黏膜上皮细胞凋亡及凋亡相关基因bax、bcl-2 mRNA表达的影响,探讨其对肠道屏障保护作用的机制.方法:72只♂Wistar大鼠按照随机数字表法分为假手术组(SO组,n=24)、重症急性胰腺炎组(SAP组,n=24)、IGF-Ⅰ治疗组(IGF-Ⅰ组,n=24).各组动物分别于术后6、12、24 h各处死8只,检测血浆淀粉酶,观察小肠组织病理学变化,TUNEL法检测小肠黏膜上皮细胞凋亡,RT-PCR检测小肠上皮细胞中bax和bcl-2mRNA的表达.结果:与SAP组各时相点相比,IGF-Ⅰ治疗组大鼠小肠黏膜上皮细胞凋亡指数显著降低(6h:13.88±1.73 vs 19.00±2.78;12 h:10.13±1.55 vs 17.63±1.60;24 h:9.50±1.07 vs 17.25±2.76;均P<0.05),小肠组织病理变化明显改善:小肠组织中bax mRNA的表达在IGF-Ⅰ组的各时相点较SAP组明显减弱(6 h:1.10±0.02vs 1.19±0.04;12 h:0.97±0.04 vs 1.16±0.02;24 h:0.87±0.03 vs 1.14±0.03,均P<0.05);bcl-2 mRNA的表达在IGF-Ⅰ组各时相点与SAP组相比明显增强(6 h:0.65±0.02 vs 0.57±0.02;12 h:0.69±0.04 vs 0.57±0.01;24 h:0.72±0.02 vs 0.58±0.01,均P<0.05).结论:外源性IGF-Ⅰ可以减轻SAP时肠黏膜的损伤.     

三棱、莪术抗大鼠肝纤维化的作用机理探讨

目的 观察肝纤维化大鼠的肝细胞凋亡和肝组织中的bax、bcl-2蛋白表达情况,探讨其抗肝纤维化的作用机理.方法 以腹腔注射猪血清制备大鼠肝纤维化模型,三棱、莪术灌胃处理大鼠.以HE染色观察大鼠肝脏组织病理变化,TUNEL法检测细胞凋亡,免疫组化法检测bax、bcl-2蛋白表达.结果 三棱、莪术能改善肝脏组织病理学变化,降低肝纤维化大鼠的细胞凋亡、bax蛋白表达,提高bcl-2蛋白表达.结论 三棱、莪术通过调节细胞凋亡相关蛋白表达,抑制细胞凋亡,起到抗肝纤维化作用.     

HBV X基因转染对HepG2肝癌细胞凋亡的影响及其机制

目的:研究HBV X基因转染对HepG2肝癌细胞凋亡及凋亡相关因子表达的影响.方法:用脂质体转染法将HBx真核表达载体pcDNA3/HBx瞬时转入HepG2细胞,以未转染的HepG2细胞及转染空载体pcDNA3的细胞为对照.RT-PCR法检测HBx基因的表达;MTT法检测各组细胞的增殖活性;TUNEL法检测各组的凋亡情况.β-actin为内参,半定量RT-PCR法检测凋亡相关基因Bax、Bcl-xL、c-myc的表达量变化.结果:pcDNA3-X转染HepG2细胞后,RT-PCR扩增出HBV X片段,空质粒组及正常对照组均未扩增出相应片段.HepG2细胞转染HBx基因后,相对于对照组细胞增殖能力明显下降,凋亡增多,差异有显著性意义(P＜0.01);转染HBx的细胞Bax、Bcl-xL、c-myc mRNA相对表达量较转染空质粒组和未转染质粒组明显增高,差异有显著性意义(P＜0.05).结论:成功将HBx基因转染入HepG2细胞,并在细胞中表达,转染HBx基因可同时上调Bax、Bcl-xL、c-myc mRNA表达,促进HepG2细胞凋亡,抑制增殖.     

雷公藤内酯醇诱导胰腺癌细胞凋亡及对5-脂氧合酶和凋亡基因表达的影响

目的 探讨雷公藤内酯醇(TL)在胰腺癌化学预防和治疗中的应用价值.方法 采用人胰腺癌细胞株SW1990作为研究对象,MTT法和吖啶橙(AO)染色分别检测SW1990细胞的增殖和凋亡,采用半定量RT-PCR法检测5-脂氧合酶(5-LOX) mRNA、bcl-2 mRNA和bax mRNA的表达.结果 10 μg/ml的TL对SW1990细胞生长的抑制率达30%以上,0.1 μg/ml TL处理24 h后,SW1990细胞凋亡指数达38.5%,显著高于对照组的14.97%.5-LOX、bcl-2、bax mRNA表达从0.7160 ± 0.0251,0.2446 ± 0.0311和0.0260 ± 0.0065分别变化为0.2400 ± 0.0316,0.0700 ± 0.0158和0.0700 ± 0.0158.结论 TL能抑制胰腺癌细胞增殖和诱导细胞凋亡,其凋亡机制可能与下调5-LOX mRNA和bcl-2 mRNA、上调bax mRNA基因表达有关.     

Inhibitory effect of antisense vascular endothelial growth factor 165 eukaryotic expression vector on proliferation of hepatocellular carcinoma cells

AIM: To construct antisense VEGF(165) eukaryotic expression vector PCDNA(3)-as-VEGF(165) and to study its expression and effect on the proliferation of hepatocarcinoma SMMC-7721 cells. METHODS: VEGF(165) cDNA was inserted into polylinker sites of eukaryotic expression vector PCDNA(3) to construct PCDNA(3)-as-VEGF(165). Then the vector was transferred into human hepatocarcinoma cell strain SMMC-7721 with cation lipofectamine 2000 mediated methods to evaluate the expression of VEGF protein and the inhibitory effect on the proliferation of hepatocarcinoma SMMC-7721 cells. RESULTS: The detection indicated the presence of VEGF cDNA in normally cultured SMMC-7721 cells by PCR. VEGF mRNA expression was notably decreased in SMMC-7721 cells by RT-PCR after PCDNA(3)-as-VEGF(165) transfection. The expression of VEGF protein was dramatically inhibited (142.01+/-7.95 vs 1 625.52+/-64.46 pg/ml(-1), P<0.01) 2 days after transfection, which correlated with the dose of PCDNA(3)-as-VEGF(165)5 gene. VEGF protein was most expressed in PCDNA(3) transferred SMMC-7721 cells but few in PCDNA(3)-as-VEGF(165) transferred cells by immunohistochemical staining. The apoptotic rate of hepatocarcinoma SMMC-7721 cells was significantly promoted (17.98+/-0.86% vs 4.86+/-0.27%, P<0.01) and the survival rate was notably decreased (80.99+/-3.20% vs 93.52+/-3.93%, P<0.05) due to antisense VEGF(165) by flow cytometry (FCM). The transfection of antisense VEGF(165) gene resulted in the inhibitory effect on the proliferation of hepatocarcinoma cells by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) and the death of all hepatocarcinoma cells on day 6 after transfection. CONCLUSION: It is confirmed that antisense VEGF(165) can inhibit the expression of VEGF protein, interfere with the proliferation and induce the apoptosis of hepatocarcinoma cells in our study. Antisense VEGF(165) gene therapy may play an important role in the treatment of human hepatocarcinoma.     

Biological impact of hepatitis B virus X-hepatitis C virus core fusion gene on

AIM: To investigate the biological impact of hepatitis B virus X- hepatitis C virus core (HBV X-HCV C) fusion gene on hepatoma cells.METHODS: The recombinant adenoviruses AdXC,Ad-X and Ad-C expressing HBV X-HCV C fusion gene,HBVX gene and HCV C gene were constructed,respectively.Hepatoma cells were infected with different recombinant adenoviruses.MTT,colonyforming experiment,FCM,TUNEL assay were performed to observe the biological impact of the HBV X-HCV C fusion gene on liver cells.RESULTS: MTT showed that the Ad-XC group cells grew faster than the other group cells.Colony-forming experiment showed that the colony-forming rate for the Ad-XC group cells was significantly higher than that for the other group cells.FCM analysis showed that Ad-XC/Ad-X/Ad-C infection enhanced the progression of GIS phase in the HepG2 cell cycle.The apoptosis index of the Ad-XC,Ad-X,Ad-C group cells was significantly lower than that of the AdO and control group cells.Semi-quantitative RT-PCR showed that the expression level of c-myc was the highest in AdXC infected cells.Tumor formation was found at the injected site of mice inoculated with Ad-XC-infected LO2 cells,but not in control mice.CONCLUSION: Ad-XC,Ad-X and Ad-C facilitate the proliferation activity of HepG2 cells and inhibit their apoptosis in vitro.The effect of Ad-XC is significantly stronger than that of Ad-X and Ad-C.Up-regulation of c-myc may be one of the mechanisms underlying the synergism of HBVX and HCV C genes on hepatocarcinogenesis in athymic nude mice.     

胱抑素C基因真核表达载体的构建及在转染的人主动脉平滑肌细胞中的表达

目的克隆人胱抑素C基因及构建胱抑素C基因真核表达载体并研究其在人血管平滑肌细胞中的表达。方法培养人脐静脉内皮细胞系,并从中提取总RNA,采用逆转录聚合酶链反应扩增胱抑素C基因,构建其真核表达载体,双酶切及聚合酶链反应鉴定阳性克隆,转染人血管平滑肌细胞,逆转录聚合酶链反应及Western blot法检测其表达情况。结果成功克隆人胱抑素C基因及构建其真核表达载体,转染后成功高表达。结论克隆人胱抑素C基因及构建其真核表达载体成功,转染人血管平滑肌细胞获得其高表达。     

胃癌相关基因GCRG213正反义真核表达载体的构建及鉴定

目的:构建胃癌相关基因GCRG213正、反义真核表达载体．方法:从pGEM-T质粒上扩增出的胃癌相关基因GCRG213的DNA片段,两端分别引入限制性内切酶KpnI,BamHI和EcoRI, BamHI识别位点．按正向、反向克隆入真核表达载体pcDNA3．1( )．测序正确的重组子pcDNA3．1-a(含GCRG213正向克隆), pcDNA3．1-b(含GCRG213反向克隆)和空载体经脂质体转染人胃癌细胞系MKN45细胞, G418筛选获得稳定转染的细胞株,采用半定量RT-PCR及Wlestern blot比较转染不同质粒的 MKN45细胞中GCRG213在mRNA和蛋白质水平上的表达差异．结果:经测序证实,GCRG213正向克隆和反向克隆正确插入真核表达载体 pcDNA3．1( ),组成重组子pcDNA3．1-a(含正向克隆),pcDNA3．1-b(含反向克隆)．重组子 pcDNA3．1-a,pcDNA3．1-b和空载体经脂质体转染人胃癌细胞系MKN45细胞,G418筛选获得稳定转染的细胞株．与对应的空载体比较,RT-PCR结果显示转染pcDNA3．1-a的 MKN45细胞中其mRNA的表达上调35．4％,而转染pcDNA3．1-b的MKN45细胞中其mRNA 的表达下调32．1％;Western blot结果显示转染 pcDNA3．1-a的MKN45细胞中其蛋白的表达上调49．4％,而转染pcDNA3．1-b的MKN45细胞中其蛋白的表达下调50．3％．结论:成功构建胃癌相关基因GCRG213正、反义真核表达载体．     

弓形虫抗原与霍乱毒素A2/B亚基复合基因在小鼠体内诱导的免疫反应

目的　观察弓形虫主要表面抗原SAG1、SAG2 与霍乱毒素A2 /B亚基复合基因真核质粒经肌肉免疫小鼠所诱导的免疫反应。方法　将SAG1基因、SAG2 基因及CTXA2 /B基因定向连接插入真核表达质粒pcDNA3.1,经酶切及测序,获得pcDNA3.1 SAG1 SAG2 及pcDNA3.1 SAG1 SAG2 CTXA2 /B的重组子;碱裂解法大量制备经肌肉注射免疫BALB/c鼠,每只鼠经后腿肌肉注射质粒10 0 μg ,每2周免疫1次,共3次,以PcDNA3.1空质粒注射组及PBS组为对照,分别于每次免疫前断尾取血和免疫后4周取小鼠脾脏测定T淋巴细胞增殖活性及NK细胞活性,ELISA法测定IgG抗体。结果　免疫组小鼠的IgG抗体水平明显提高,NK细胞杀伤活性和T细胞增殖活性也明显增强。免疫鼠抗攻击感染的时间延长。结论　含有霍乱毒素的复合基因免疫小鼠后体液免疫和细胞免疫水平均有提高。     

白色念珠菌sap2基因真核表达质粒的构建及免疫原性研究

目的构建以白色念珠菌SAP2蛋白编码基因sap2为目的基因的真核重组表达质粒,并对其免疫原性进行分析。方法RT-PCR法自白色念珠菌标准菌株ATCC64550中获取sap2基因,插入真核表达载体pcDNA3.1中,将真核表达经质粒大抽提并定量后免疫BALB/c小鼠,ELISA法检测抗体产生水平,流式细胞仪检测细胞免疫。结果RT-PCR法克隆出全长为1 197 bp的sap2基因;用构建的pcDNA3.1-SAP2免疫小鼠,能诱导产生效价为1∶1 600的IgG抗体,同时CD4^＋T和CD8^＋T细胞百分比增高。结论成功获取了白色念珠菌sap2蛋白基因,真核表达质粒能够诱导动物的体液免疫和细胞免疫。     

Ⅱ型胶原蛋白基因cDNA序列分析及其真核表达载体的构建

目的构建人Ⅱ型胶原蛋白(hCⅡ)基因真核表达载体PcDNA3.1(+)/hCⅡ。方法提取患者关节软骨组织总RNA,应用RT-PCR方法扩增出CⅡ基因片段,测序鉴定正确后,插入真核表达载体PcDNA3.1(+)中构建hCⅡ基因真核表达载体PcDNA3.1(+)/hCⅡ,并进行PCR鉴定、酶切鉴定和序列分析。结果 PCR鉴定、酶切鉴定和序列分析表明CⅡ成功插入表达载体PcDNA3.1(+)。结论本研究成功构建了hCⅡ基因真核表达载体PcDNA3.1(+)/hCⅡ。     

Inhibition mechanism of a newly cloned candidate tumor suppressor gene JST during hepatocarcinogenesis and its abnormal expression in human hepatocellular carcinoma from Qidong liver cancer risk area, China

BACKGROUND/AIMS: To study inhibition effect of a newly cloned candidate tumor suppressor gene (JST) during hepatocarcinogenesis and its normal expression in human hepatocellular carcinoma from Qidong liver cancer risk area, China. METHODOLOGY: By preparing rabbit anti-human JST polyclonal antibody, constructing of JST frameshift mutant and exploring RT-PCR, in situ hybridization, immunohistochemistry, Western blot, Northern blot, cDNA expression microarray, co-immunoprecipitation and the tumorigenicity assay in vivo and in vitro, gene treatment, etc, JST gene expression and inhibition tumor growth effects were analyzed, including 150 pairs of HCC specimens and their adjacent para-cancerous tissues, 8 cases of normal liver tissues and QGY7701, HepG2, Hep3B cell line. Its relationship with the invasiveness of HCC from Qidong was also investigated. RESULTS: Our results showed that there is expression difference for JST between liver cancer and para-cancerous tissue and the results of RT-PCR, in situ hybridization, immunohistochemistry, Western blot, Northern blot suggested that it is a down-regulation gene. The labeling index (LI) of cancer tissue and para-cancerous tissue was (70.2+/-8.7) and (9.4+/-2.8) respectively (p<0.01), lower LI was closely related with invasiveness of HCC, decreased expression of JST was also shown by Western blotting. Results of RT-PCR showed the JST gene expression index (EI) of HCCs was lower than that of para-cancerous tissue and normal liver tissue and there are some sequence differences between cancer and para-cancerous tissues. Northern blot showed JST having down-regulation expression among 92.20% (138/150) of patients. Using in situ hybridization, the signal corresponding to JST mRNA was particularly weak in cytoplasm of HCC when compared with those of para-cancerous and normal liver tissues. Less expression of JST was also found to be correlated with high metastasis potentiality of HCC. JST overexpression inhibits DNA synthesis and apoptosis in QGY7701 cells. QGY7701 cell transfected with JST is more inhibited in soft agar than that of vector transfected control cells (p<0.01) or QGY7701 cells stably transfected with the JST frameshift mutant. The tumor formation is more inhibited in the QGY7701-pcDNA3.1-JST group than that in the QGY7701-pcDNA3.1, QGY7701-pcDNA3.1-JST frameshift mutant group. cDNA expression microarray showed expression differences of 10% (20/200,18 up-regulation; 2 up-regulation) tumor genes were considered significant between QGY7701-pcDNA3.1-JST and QGY7701-pcDNA3.1. Using a co-immunoprecipitation approach, intracellular binding of JST and p53 was found. Higher levels of p53 were detected following infection with pcDNA3.1-JST when compared with pcDNA3.1. Induction of FasL could be demonstrated in Hep3B and in HepG2 cells following transfection pcDNA3.1-JST, but not following transfection pcDNA3.1. CONCLUSIONS: JST is a putative tumor suppressor gene. Overexpression of JST gene may contribute to inhibiting the occurrence, advancement and invasiveness of HCC from Qidong, a high risk area in China.