siRNA靶向沉默PcG蛋白EZH2对人胃癌细胞株MKN45增殖和侵袭力的影响

背景：PcG蛋白是一组转录抑制因子,其核心成分EZH2在胃癌组织中表达增高,并与胃癌的进展相关。目的：应用RNA干扰（RNAi）技术研究EZH2对人胃癌细胞株MKN45增殖和侵袭力的影响,从细胞水平探讨EZH2参与胃癌发生的机制。方法：使用EZH2小干扰RNA（siRNA）转染MKN45细胞,以实时逆转录聚合酶链反应（RT-PCR）和蛋白质印迹法检测EZH2mRNA和蛋白表达,CCK-8（Cell Counting Kit-8）实验检测细胞增殖情况,流式细胞仪分析细胞周期．MatrigelTM侵袭实验检测细胞侵袭力。结果：EZH2siRNA能有效抑制MKN45细胞的EZH2mRNA和蛋白表达。与阴性对照siRNA组相比,EZH2siRNA组MKN45细胞增殖抑制率为14．7％（P＜0．05）,侵袭能力显著降低[穿过Transwell小室膜细胞数：（38．5±3．4）个／HPF对（92．7±9．7）个／HPF,P＜0．05）,细胞周期阻滞于G0／G1和G2／M期。结论：EZH2siRNA可抑制人胃癌细胞的增殖和侵袭力,证实EZH2通过促进细胞增殖和侵袭在胃癌发生中发挥作用。     

siRNA沉默Annexin-1基因对膀胱癌T24细胞生物学特性的影响

目的观察RNA干扰技术沉默Annexin-1基因表达对膀胱癌T24细胞增殖能力的影响。方法针对Annexin-1基因不同部位设计并化学合成3对不同的靶向小干扰RNA(siRNA),脂质体介导瞬时转染膀胱癌T24细胞,转染后应用半定量RT-PCR和Western印迹法检测Annexin-1mRNA和蛋白的改变,透射电镜观察细胞凋亡情况,用MTT法检测沉默Annexin-1表达对膀胱癌T24细胞增殖的影响。结果转染siRNA后膀胱癌T24细胞Annexin-1mRNA和蛋白水平显著下降(P0.05),转染siRNA沉默Annexin-1基因表达后膀胱癌T24细胞出现典型凋亡细胞,增殖能力显著下降(P0.05)。结论 RNA干扰Annexin-1基因后其mRNA和蛋白水平显著下降,诱导了膀胱癌T24细胞凋亡,并且抑制细胞的增殖。     

ZNF278 siRNA抑制胃癌细胞株AGS增殖的实验研究

背景：ZNF278属C2H2型锌指蛋白,为参与生长发育的重要转录因子,其异常表达可能参与肿瘤发生。目的：研究ZNF278siRNA对胃癌细胞株AGS增殖和周期的影响。方法：以蛋白质印迹法检测正常胃上皮细胞株GES-1和胃癌细胞株AGS中ZNF278表达。构建ZNF278siRNA片段,并转染胃癌AGS细胞,转染阴性对照siRNA和RPMll640分别作为阴性对照组和空白对照组。以定量RT-PCR和蛋白质印迹法分别检测ZNF278mRNA和蛋白表达,利用MTT和细胞计数法检测细胞增殖情况,流式细胞术检测细胞周期变化。结果：胃癌AGS细胞中ZNF278表达明显高于正常胃上皮细胞GES-1。ZNF278siRNA转染胃癌ACTS细胞后,ZNF278mRNA和蛋白表达均明显下调,而阴性对照组与空白对照组无明显差异。MTT法示ZNF278siRNA组AGS细胞增殖率显著低于阴性对照组（0．64±0．03对0．81±0．03,P〈0．01）,细胞计数法示细胞数量亦显著降低[（4．11±0．35）×10^5对（5．78±0．50）×10^5,P〈0．01],流式细胞术显示ZNF278siRNA组G0／G1期细胞明显增加而s期细胞明显减少（P〈0．05）。结论：转染ZNF278siRNA可抑制胃癌AGS细胞增殖,细胞周期阻滞于G0／G1期。     

siRNA沉默Livin基因对胃癌细胞生长、凋亡的影响

目的:观察小分子干扰RNA(siRNA)沉默Livin基因在胃癌BGC-823细胞中的表达, 并探讨Livin基因对胃癌细胞生长、凋亡的影响.方法:自行设计两条针对Livin基因的siRNA:Livin-sh-1和Livin-sh-2, 以此构建相应的表达载体并分别转染至对数生长期胃癌BGC-823细胞, 经G418筛选后分别采用半定量RTPCR检测不同siRNA实验分组细胞BGC-823mRNA水平变化, 四氮唑盐比色法(MTT)检测细胞增殖、流式细胞仪检测胃癌细胞的凋亡.结果:siRNA对照组与空siRNA载体组Livinα/β mRNA表达差别无显著性; 但转染siRNA组Livin α/β mRNA表达显著低于空白对照组和空siRNA载体组(Livin α:0.11±0.07 vs 0.37±0.10, 0.34±0.08; Livin β:0.13±0.04 vs 0.43±0.09, 0.45±0.11, 均P<0.05). 空白对照组与空siRNA载体组相比, 24、48、96 h和1 wk时细胞生长未受影响; 而siRNA组在转染后24 h和48 h细胞生长未受影响, 但在96 h和1 wk时则被明显抑制( P<0.01). 转染siRNA组的细胞的凋亡率与空白对照组和转染空siRNA载体组相比显著增加(14.85%±1.35% vs 4.51%±0.36%, 6.13%±0.71%, 均P<0.05).结论:siRNA沉默Livin基因能抑制胃癌细胞的生长, 促进胃癌细胞的凋亡, Livin基因有可能成为胃癌治疗的新靶点.     

沉默USP9X对肝癌HepG2细胞周期和自噬的作用机制

目的探讨沉默USP9X对肝癌HepG2细胞周期和自噬的作用机制。方法采用siRNA技术沉默USP9X在肝癌HepG2细胞株中的表达,实验分为siRNA组和阴性对照(NC)组;采用MTT法检测细胞增殖率;采用流式细胞术检测细胞周期分布;采用western blot检测细胞中USP9X、LC3-II以及Beclin-1蛋白的表达。结果转染siRNA后,siRNA组中USP9X蛋白表达明显低于NC组(0.44±0.15 vs.1.00±0.00,P0.05);MTT结果表明在HepG2细胞株在沉默24 h、48 h和72 h室的细胞增殖率分别为0.0873±0.0131、0.1047±0.0128和0.1203±0.0148,分别明显低于NC组的0.1113±0.0083、0.1333±0.0062和0.1610±0.0080(P0.05);流式细胞术结果表明在siRNA组中,处于G0-G1期的HepG2细胞数量明显高于NC组(72.32%±1.53%vs.56.30%±3.47%,P0.05),处于S期的HepG2细胞数量明显低于NC组(20.53%±0.66%vs.37.73%±1.82%,P0.05);western blot结果表明siRNA组中的Beclin-1和LC3-II蛋白表达明显高于NC组(1.47±0.19 vs.1.00±0.00,1.48±0.11 vs.1.00±0.00,均P0.05)。结论 USP9X基因沉默可通过阻滞细胞周期进程和诱导细胞自噬进而有效抑制肝癌HepG2细胞的过度增殖。     

小干扰RNA抑制胃癌细胞环氧合酶-2的表达

目的 观察瞬时转染环氧合酶-2特异性小干扰RNA(COX-2 siRNA)对胃癌细胞增殖与凋亡的影响,探讨COX-2在胃癌发生中的作用和RNA干扰方法 对肿瘤的治疗作用.方法 以胃癌细胞系SGC7901为研究对象,瞬时转染COX-2 siRNA,转染后72 h用RT-PCR方法 分别检测COX-2siRNA组、无意义siRNA组及空白对照组的COX-2 mRNA表达;免疫组化法与Western blot检测3组细胞的COX-2蛋白质的表达;流式细胞仪检测3组的细胞周期和凋亡情况.转染后1周内每天同一时间用噻唑蓝比色分析法(MTr)检测3组癌细胞的活力并计算癌细胞的相对生存率.结果 COX-2siRNA对胃癌细胞中COX-2 mRNA及蛋白表达均有明显抑制作用,胃癌细胞增殖受到抑制,凋亡增加,但细胞周期分布无明显变化.结论 在胃癌细胞中,COX-2表达的抑制可降低胃癌细胞的增殖速度,促进肿瘤细胞凋亡,COX-2在胃癌的发生中可能具有重要作用.     

体外RNA干扰抑制RegⅣ基因表达对胃癌细胞增殖及凋亡的影响

目的:拟探讨RegⅣ基因在胃癌细胞中的表达及干扰该基因对胃癌细胞增殖和凋亡的影响.方法:应用实时定量PCR方法检测九株胃癌细胞株中RegⅣ基因的mRNA表达. 针对RegⅣ基因设计三条小干扰RNA片段(siRNA1、siRNA2、siRNA3), 瞬时转染高表达胃癌细胞株, 实时定量PCR方法检测转染后RegⅣ基因的mRNA的表达水平, CCK-8法检测细胞增殖能力, 流式细胞仪检测细胞凋亡.结果:以永生化正常胃黏膜细胞株GES-1作为参照, 除MKN-45和SNU-1胃癌细胞株外, 其余胃癌细胞株中RegⅣ表达水平均升高5倍以上, 尤以SNU-16细胞株明显, 其RegⅣ的表达水平高出GES-1细胞数千倍, 遂选用SNU-16细胞进行RNA干扰. 合成的三对siRNA对RegⅣ基因表达均有明显抑制作用, 抑制率分别为79.3%、77.4%和60.4%. 选用siRNA1干扰SNU-16细胞株后96 h和120 h, 其细胞增殖率受到明显抑制( P = 0.0057, 0.0173). 流式细胞仪检测显示72 h细胞凋亡率明显增加( P =0.0231).结论:干扰RegⅣ基因具有抑制胃癌细胞增殖,促进凋亡的作用, RegⅣ基因可能成为胃癌基因靶向治疗的分子靶点.     

RNA干扰真核表达载体对前列腺癌细胞CXCR4基因表达的抑制作用

目的 研究RNA干扰(RNAi)真核表达载体对前列腺癌细胞趋化因子CXC受体4(CXCR4)基因的抑制作用.方法 构建针对CXCR4基因的RNA干扰质粒表达载体,采用脂质体法转染前列腺癌PC-3m、LNCaP细胞系,半定量逆转录聚合酶链反应(RT-PCR)、Western blot法检测其对CXCR4 mRNA及蛋白表达的影响.结果 构建的重组真核表达载体在前列腺癌PC-3m、LNCaP细胞系中均抑制了CXCR4 mRNA及蛋白表达.与空白载体组细胞作对照,PC-3m细胞中小干扰RNA(siRNA)对CXCR4 mRNA的抑制率24、48 h分别为(87.8±10.2)%、(56.1±9.3)%,LNCaP细胞中siRNA对CXCR4 mRNA的抑制率分别为(56.9±8.8)%、(49.2±11.2)%,siRNA对PC-3m和LNCaP细胞蛋白抑制率,于24 h,前者为(64.7±6.7)%,后者为(58.7±11.6)%,与阴性载体转染组细胞比较,两组差异有统计学意义(P＜0.05).结论 RNA干扰真核表达载体可以有效地抑制两种前列腺癌细胞PC-3m、LNCaP细胞中CXCR4基因的表达.     

siRNA靶向沉默YAP1对卵巢癌细胞skov3增殖凋亡的影响

目的探讨小干扰RNA(si RNA)靶向沉默Yes相关蛋白(YAP)1基因表达对人卵巢癌细胞skov3增殖凋亡的影响。方法采用脂质体Lipofectamine~(TM)2000将靶向干扰YAP1的siRNA转染至对数生长期skov3细胞(siYAP1组),同时设不行转染处理的对照组和转染随机序列siRNA的转染对照组(si Control组),转染48 h后采用实时定量PCR(qPCR)检测各组的YAP1 mRNA水平;采用水溶性四氮唑(WST-1)法评价各组转染后的增殖情况,分别采用AnnexinⅤ-FITC/PI双染流式细胞术及qPCR检测转染后凋亡率及凋亡相关蛋白(抗凋亡蛋白Bcl-2、Mcl-1和促凋亡蛋白Bid、Bax)的mRNA水平,PI单染流式细胞术检测转染后的细胞周期分布情况。结果 qPCR法检测发现si YAP1组转染48 h后的YAP1 mRNA水平为(0.141±0.018),低于对照组和siControl组(均P<0.05),提示在skov3细胞中靶向沉默YAP1成功;skov3细胞经siRNA靶向沉默YAP1表达后的生长增殖受明显抑制、凋亡形态明显改变及发生G0/G1期细胞周期阻滞,与对照组和siControl组相比,siYAP1组的增殖抑制率、凋亡率、促凋亡蛋白水平及G0/G1期细胞比例均升高,而促凋亡蛋白水平及S期细胞比例均降低(P<0.05);对照组和siControl组增殖、凋亡及细胞周期相关指标的差异无统计学意义(P>0.05)。结论通过siRNA在基因水平上沉默YAP1表达可抑制skov3细胞的增殖并诱发凋亡和细胞周期阻滞,在卵巢癌的靶向治疗中可能有一定前景。     

生存素siRNA表达质粒对MGC-803细胞增殖的影响

目的:应用siRNA表达载体介导的RNAi技术,观察 RNA干扰沉默生存素基因对胃癌MGC-803细胞增殖的影响．方法:用脂质体介导将生存素siRNA表达质粒转染 MGC-803细胞,通过倒置显微镜观察转染后细胞形态学的变化,四甲基偶氮唑蓝(MTT)法检测细胞增殖活性,流式细胞术分析细胞周期的变化,逆转录聚合酶链式反应(RT-PCR)方法检测生存素mRNA的表达水平．结果:生存素siRNA表达质粒转染组MGC-803细胞变圆、浮起,生存素siRNA表达质粒明显下调MGC-803 细胞内生存素mRNA的表达,与空白对照组相比降低了48．2％,阻断细胞周期在G1期(77．4％),显著抑制细胞增殖,siRNA转染组细胞吸光度比空白组显著降低 (24 h:0．272±0．048 vs 0．576±0．018;48 h:0．270±0．060 vs 0．809±0．027;72 h:0．143±0．046 vs 1．015±0．075;均 P<0．01)．转染24,48和72 h后的抑制率分别为53．4％, 66．7％和86.3％．结论:应用siRNA表达载体介导的RNAi技术,可有效下调生存素在MGC-803细胞中的表达,并在体外抑制细胞的增殖．     

Ubiquitin-specific protease 22 enhances intestinal cell proliferation and tissue regeneration after intestinal ischemia reperfusion injury

BACKGROUND Intestinal ischemia reperfusion(I/R) injury is a serious but common pathophysiological process of many diseases, resulting in a high mortality rate in clinical practice. Ubiquitin-specific protease 22(USP22) acts as regulator of cell cycle progression, proliferation, and tumor invasion. Depleted USP22 expression has been reported to contribute to arrested cell cycle and disrupted generation of differentiated cell types in crypts and villi. However, the role of USP22 in intestinal damage recovery has not been investigated. Therefore, elucidation of the underlying mechanism of USP22 in intestinal I/R injury may help to improve the tissue repair and patient prognosis in clinical practice.AIM To investigate the role of USP22 in intestinal cell proliferation and regeneration after intestinal I/R injury.METHODS An animal model of intestinal I/R injury was generated in male Sprague-Dawley rats by occlusion of the superior mesenteric artery followed by reperfusion.Chiu's scoring system was used to grade the damage to the intestinal mucosa. An in vitro model was developed by incubating rat intestinal epithelial IEC-6 cells in hypoxia/reoxygenation conditions in order to simulate I/R in vivo. siRNA and overexpression plasmid were used to regulate the expression of USP22. USP22,Cyclin D1, and proliferating cell nuclear antigen(PCNA) expression levels were measured by Western blot analysis and immunohistochemistry staining. Cell survival(viability) and cell cycle were evaluated using the Cell Counting Kit-8and flow cytometry, respectively.RESULTS USP22 expression was positively correlated with the expression levels of PCNA and Cyclin D1 both in vivo and in vitro, which confirmed that USP22 was involved in cell proliferation and intestinal regeneration after intestinal I/R injury. Decreased levels of Cyclin D1 and cell cycle arrest were observed in the USP22 knockdown group(P < 0.05), while opposite results were observed in the USP22 overexpression group(P < 0.05). In addition, increased expression of USP22 was related to improved intestinal pathology or IEC-6 cell viability after I/R or hypoxia/reoxygenation. These results suggested that USP22 may exert a protective effect on intestinal I/R injury by regulating cell proliferation and facilitating tissue regeneration.CONCLUSION USP22 is correlated with promoting intestinal cell proliferation and accelerating intestinal tissue regeneration after intestinal I/R injury and may serve as a potential target for therapeutic development for tissue repair during intestinal I/R injury.     

RNA干扰DNA甲基转移酶1对人胰腺癌PaTu8988细胞增殖和凋亡的影响

目的 观察以DNA甲基转移酶1(DNA methy transferas 1,DNMT1)基因为靶基因的RNA干扰对人胰腺癌PaTu8988细胞增殖及凋亡的影响.方法 设计、合成针对DNMT1基因的siRNA和阴性对照siRNA(N-siRNA).实验分为空白对照组、脂质体组(仅予脂质体)、N-siRNA组(转染30 nmol N-siRNA)、siRNA组(转染30 nmol siRNA).siRNA转染48 h后,实时PCR法检测DNMT1 mRNA水平;WST-8法检测细胞增殖;流式细胞技术检测细胞凋亡.结果 siRNA组DNMT1 mRNA的抑制率为(86.0±4.3)%,明显高于N-siRNA组的(40.1±2.2)%和空白对照组的0(P＜0.01);细胞存活率为(47.6±5.6)%,明显低于N-siRNA组的(68.1±4.1)%和空白对照组的100%(P＜0.01);细胞凋亡率为(14.94±2.89)%,明显高于空白对照组的(7.51±1.12)%、脂质体组的(7.06±0.39)%、N-siRNA组的(8.84±1.44)%(均P＜0.01).结论 siRNA能特异、有效地抑制人胰腺癌PaTu8988细胞DNMT1mRNA的表达,同时抑制细胞增殖、促进细胞凋亡.     

核抗原Mina53在人胃癌细胞中的作用及其意义探讨

背景:核抗原Mina53基因为原癌基因Myc的下游直接靶基因之一,在一些消化系统恶性肿瘤中呈高表达,并与肿瘤增殖、侵袭、转移或患者生存期相关。目的:研究Mina53在人胃癌细胞中的作用及其对胃癌发生、发展的意义。方法:选择Mina53表达水平较高的人胃癌细胞株SGC7901和AGS,应用RNA干扰技术下调其Mina53表达,以转染无关序列siRNA的细胞作为对照组。采用CCK-8实验检测细胞增殖,流式细胞术检测细胞周期和细胞凋亡,细胞侵袭和迁移实验检测细胞侵袭、迁移能力。结果:与相应对照组相比,Mina53 siRNA转染组SGC7901、AGS细胞增殖受抑(96 h相对增殖率:60%和68%),并发生明显细胞周期G1期阻滞(SGC7901细胞G1/G2:2.76±0.12对1.86±0.06,P<0.05;AGS细胞G1/G2:1.78±0.13对1.34±0.05,P<0.05),细胞凋亡率分别增加9.8%±1.2%和10.6%±1.5%(P<0.05),穿透Transwell小室基质胶细胞数(SGC7901细胞:11.67±0.88对24.33±1.45,P<0.05;AGS细胞:8.00±1.15对20.33±1.73,P<0.05)和穿透Transwell小室微孔膜细胞数(SGC7901细胞:7.00±1.53对14.67±2.03,P<0.05;AGS细胞:8.00±1.16对15.33±1.45,P<0.05)均显著减少。结论:Mina53对人胃癌细胞的增殖、细胞周期、细胞凋亡以及侵袭、迁移能力具有调控作用,可能影响胃癌的生长、浸润和转移,有望作为胃癌基因治疗的靶点。     

核糖体蛋白L5在胃癌中的表达及功能

目的:探讨核糖体蛋白L5(ribosomal protein L5,RPL5) 在胃癌细胞中的表达及对胃癌细胞生长的影响．方法:Western blot检测RPL5在胃癌细胞系中的表达, 构建RPL5特异性siRNA载体,转染细胞,Western blot进行鉴定,MTT方法和流式细胞术检测转染细胞的生长变化．结果:RPL5在胃癌细胞系AGS、MKN45、SGC7901、 MGC803中的表达均明显强于在GES-1和正常胃黏膜上皮中的表达．成功构建RPL5特异siRNA载体U6- RPL5A和U6-RPL5B,转染AGS细胞,进行稳定筛选,发现U6-RPL5A能显著抑制RPL5的表达,其相应的细胞系AGS-U6-RPL5A的生长速度减慢．细胞周期检测结果显示AGS-U6-RPL5A细胞中处于增殖期的细胞减少了约5％．结论:对RPL5功能的进一步深入研究可能会有助于胃癌的诊断和治疗．     

Capsaicin-induced cell death in a human gastric adenocarcinoma cell line

AIM: Capsaicin, a pungent ingredient found in red pepper, has long been used in spices, food additives, and drugs. Cell death induced by the binding of capsaicin was examined in a human gastric adenocarcinoma cell line (AGS cells). METHODS: By using XTT-based cytotoxicity assay, flow cytometry using the TUNEL method, and quantitation of DNA fragmentation, both cell death and DNA fragmentation were detected in AGS cells treated with capsaicin. By using Western blotting methods, capsaicin reduced the expression of Bcl-2, the antiapoptotic protein, in AGS cells in a concentration-dependent manner. RESULTS: After incubation of AGS cells with capsaicin for 24 h, cell viability decreased significantly in a dose-dependent manner. After incubation of AGS cells with capsaicin for 24 h, apoptotic bodies also significantly increased, and were again correlated with the dose of capsaicin. When the concentration of capsaicin was 1 mmol/L, the amount of DNA fragments also increased. Similar results were also in the lower traces. CONCLUSION: These results suggest that capsaicin-induced cell death might be via a Bcl-2 sensitive apoptotic pathway. Therefore, capsaicin might induce protection from gastric cancer.     

Capsaicin-induced cell death in a human gastric adenocarcinoma cell line

AIM: Capsaicin, a pungent ingredient found in red pepper,has long been used in spices, food additives, and drugs.Cell death induced by the binding of capsaicin was examined in a human gastric adenocarcinoma cell line (AGS cells).METHODS: By using XTT-based cytotoxicityassay, flow cytometry using the TUNEL method, and quantitation of DNA fragmentation, both cell death and DNA fragmentation were detected in AGS cells treated with capsaicin. By using Western blotting methods, capsaicin reduced the expression of Bcl-2, the antiapoptotic protein, in AGS cells in a concentration-dependent manner.RESULTS: After incubation of AGS cells with capsaicin for 24 h, cell viability decreased significantly in a dose-dependent manner. After incubation of AGS cells with capsaicin for 24 h, apoptotic bodies also significantly increased, and were again correlated with the dose of capsaicin. When the concentration of capsaicin was 1 mmol/L, the amount of DNA fragments also increased. Similar results werealso in the lower traces.CONCLUSION: These results suggest that capsaicininduced cell death might be via a Bcl-2 sensitive apoptotic pathway. Therefore, capsaicin might induce protection from gastric cancer.     

干扰RNA靶向抑制埃兹蛋白对胃癌细胞增殖的影响

目的探讨埃兹蛋白(ezrin)对胃癌细胞生长和侵袭转移能力的影响。方法选取胃癌细胞系(AGS)作为研究材料,构建ezrin干扰载体,脂质体转染下调ezrin的表达,分别通过RT-PCR和Western blot法检测阻抑效应。以噻唑蓝比色法(MTT)检测细胞增殖。结果RT-PCR和Western blot结果显示,脂质体转染对ezrin mRNA和蛋白表达水平均有显著下调作用。下调ezrin蛋白后,AGS细胞的增殖受到显著抑制,与干扰前比较差异有统计学意义(P<0.01)。结论ezrin在胃癌生长过程中发挥重要作用,有可能成为抑制胃癌发生发展的新靶点。     

Changes of NF—kB,p53,Bcl—2 and caspase in apoptosis induced by JTE—522 in human gastric adenocarcinoma cell line AGS cells：role of reactive oxygen species

AIM:To identify whether JTE-522 can induce apoptosis in AGS cells and ROS also involved in the process,and to investigate the changes in NF-kB,p53,bcl-2 and caspase in the apoptosis process.METHODS:Cell culture,MTT,Electromicroscopy,agarose gel electrophoresis,lucigenin,western blot and electrophoretic mobility shift assay(EMSA)analysis were employed to investigate the effect of JTE-522 on cell proliferation and apoptosis in AGS cells and related molecular mechanisms.RESULTS:JTE-522 inhitied the growth of AGS cells and induced the apoptosis,Lucigenin assay showed thd generation of ROS in cells under incubation with JTE-522,The increased ROS generation might Contribute to the induction of AGS cells to apoptosis.EMSA and Western blot revealed that NF-kB activity was almost completely inhihbited by preventing the degradation of IKBα,Additionally,by using Western blot we confirmed that the level of bcl-2 was decreased,whtereas p53 showed a great inmcrease following JTE-522 treatment.Their changes were in a dose-dependent manner. CONCLUSION：These findings suggest that reactive oxygen species,NF-kB,p53,bcl-2 and caspase-3 may play an important role in the induction of apoptosis,in ags cells after treatment with JTE-522.     

siRNA干扰纤维蛋白原α链基因对人肝癌细胞增殖和凋亡的影响

背景：纤维蛋白原（FG）是由肝细胞合成、分泌的糖蛋白。除凝血和纤溶外,FG在细胞增殖、血管发生、肿瘤的发生、进展和转移中亦发挥重要作用。肝细胞癌患者血浆FG水平显著高于健康人。目的：观察以RNA干扰技术抑制FG仅链（FGA）基因对人肝癌细胞增殖和凋亡的影响。方法：构建FGAsiRNA干扰质粒,将重组质粒pU6．FGAsiRNA稳定转染入人肝癌细胞株HepG2,同时设置空质粒载体pU6转染组作为对照。以RT－PCR、蛋白质印迹法在mRNA和蛋白质水平验证干扰效果,以CCK－8实验和流式细胞术检测各组HepG2细胞的增殖和凋亡情况。结果：FGAsiRNA转染组HepG2细胞FGAmRNA和蛋白表达明显低于空载体转染组,细胞增殖显著受抑（P〈0．001）,细胞凋亡显著增加（P〈0．001）。结论：RNA干扰技术能有效下调人肝癌细胞的FGA表达,抑制肿瘤细胞生长增殖并促进其凋亡。FGA可能成为肝细胞癌治疗的潜在靶点之一。