二甲双胍对AGS胃癌细胞生长侵袭的抑制作用

目的:研究应用安全性较好的二甲双胍对胃癌细胞的抑制作用,初步探讨可能机制.方法:以二甲双胍联合或不联合5-氟尿嘧啶干预AGS细胞作为实验组,无药物组作对照.干预24、48、72 h应用MTT检测细胞增殖,干预48 h流式细胞术检测凋亡、线粒体膜电位,72 h通过细胞划痕实验反映迁移能力改变.药物作用24 h抽提细胞RNA以RT-PCR检测相关基因转录改变.结果:AGS细胞相对活力明显降低(24、48、72h:F=99.32,127.30,235.72,均P<0.01),并具有浓度-时间依赖性,联合应用5-氟尿嘧啶显示协同作用(24h:t=2.97,P<0.05;48、72h:t=4.61,6.02,均P<0.01).线粒体膜电位下降(t=12.43,P<0.01),凋亡增加(t=8.32,P<0.01),平均迁移速率明显减慢(12、24、48 h:t=9.13,13.77,14.21,均P<0.01),cyclin D1、Bcl-2、MMP-2、MMP-9 mRNA均减少,Bax增加.结论:二甲双胍能够抑制AGS胃癌细胞增殖、迁移,促进凋亡,与5-氟尿嘧啶联合应用具有协同抑制作用.     

二甲双胍对人胰腺癌细胞迁移的抑制作用

目的:研究二甲双胍对胰腺癌细胞迁移的影响,并初步探讨可能机制.方法:体外培养人胰腺癌细胞株Bxpc-3,予二甲双胍进行干预作为实验组(M组),无药物组作为对照组(C组).MTT检测二甲双胍对Bxpc-3细胞存活率的影响,细胞划痕实验检测划痕愈合率,RT-PCR检测MMP-2、MMP-9 mRNA的表达,Elisa检测细胞培养上清液MMP-2、MMP-9蛋白的分泌量.结果:与对照组相比,MTT结果示二甲双胍可以抑制人胰腺癌细胞株Bxpc-3的增殖,并呈时间-浓度依赖性(F=8.991,124,114.61,P<0.01);划痕实验示二甲双胍干预组12、24、48h与对照组相比划痕愈合率显著下降(t=7.683,9.013,10.471,P<0.01);RT-PCR示二甲双胍干预组MMP-2、MMP-9mRNA的表达显著降低(t=16.563,28.494,P<0.01);Elisa示二甲双胍干预组MMP-2、MMP-9蛋白分泌明显下降(t=9.428,13.542,P<0.01).结论:二甲双胍能显著抑制人胰腺癌细胞株Bxpc-3的增殖及迁移,其主要机制可能与抑制MMP-2、MMP-9活性有关.     

表没食子儿茶素没食子酸酯诱导细胞凋亡蛋白酶途径依赖的人胃癌细胞株MKN45凋亡

背景：表没食子儿茶素没食于酸酯（EGCG）可诱导人胃癌细胞株MKN45凋亡，但其凋亡信号的传导途径尚不清楚。目的：研究EGCG诱导人胃癌细胞株MKN45凋亡的作用是否通过细胞凋亡蛋白酶（caspsse-3）依赖途径，为其临床应用提供进一步的理论依据。方法：采用四甲摹偶氮唑蓝（MTT）比色法检测EGCG和caspase-3抑制剂z-DEVD-fmk作用后MKN45细胞的存活率：采用Annexin V-FITC＋PI双染色法检测EGCG和caspase-3抑制剂作用后MKN45细胞的凋亡率：采用酶联免疫吸附测定（ELISA）检测EGCG和caspase-3抑制剂作用后MKN45细胞内caspase-3活性的改变。结果：EGCG可诱导MKN45细胞凋亡，且细胞内caspase-3活性显著升高。而caspase-3抑制剂干预后，EGCG抑制MKN45细胞生长的作用明显减弱，细胞凋亡率下降，caspase-3活性显著下降。结论：EGCG可诱导MKN45细胞凋亡，该作用可被caspase-3抑制剂显著抑制，提示EGCG诱导MKN45细胞凋亡的作用是通过caspase-3依赖途径的。     

尼美舒利和5-氟尿嘧啶联用对胃癌细胞的协同抑制作用及机制

目的 体外研究选择性环氧合酶-2（COX-2）抑制剂尼美舒利和5-氯尿嘧啶（5-FU）对胃癌细胞的抑制作用及机制。方法 以胃癌细胞株MKN45、MKN28为研究对象．观察尼美舒利和5-FU单独或联合应用对细胞增殖、凋亡和细胞周期的影响。应用MTT法检测细胞增殖，流式细胞仪检测细胞凋亡（FITC-Annexin-V/PI双标记）和细胞剧期，RT-PCR观察朋药前后COX-2 mRNA在两株细胞中的表达，Western免疫印迹法观察经两种药物单独和联合作用48h后细胞内凋亡相关蛋白Bax和Bcl-2的表达。结果 在MKN45和MKN28细胞中均可观察到不同水平的COX-2 mRNA表达，尼美舒利和5FU联合应用可明显抑制COX-2 mRNA表达。尼美舒利可抑制两株细胞的增殖并诱导凋亡。尼美舒利和5-FU具有协同抑制细胞增殖及诱导凋亡的作用，该作用与两种药物作用顺序无关，但在联用时作用最强。两药协同抑制增殖的作用主要通过协同杀伤和诱导凋亡而实现。5-FU增强了凋亡诱导蛋白Bax的表达，而尼美舒利则减少凋亡抑制蛋白Bcl-2的表达。两药联用可明显抑制胃癌细胞株生长。结论 选择性环氧合酶-2抑制剂尼美舒利和5-FU通过抑制COX-2 mRNA的表达硬增强Bax／Bcl-2的表达比率诱导胃癌细胞凋亡．从而对胃癌细胞起到协同抑制增殖的作用。     

二甲双胍联合COX-2选择性抑制剂塞来昔布对胃癌SGC-7901细胞增殖凋亡的影响

目的探讨二甲双胍联合环氧化酶-2(COX-2)选择性抑制剂塞来昔布对胃癌SGC-7901细胞增殖凋亡的影响及其机制。方法以不同浓度的二甲双胍和塞来昔布处理体外培养的SGC-7901细胞,MTT法检测细胞的存活率。联合实验分为:对照组(未加药)、二甲双胍组(加入浓度为10 mmol/L二甲双胍)、塞来昔布组(加入浓度为100μmol/L塞来昔布)和联合组(加入浓度为10 mmol/L二甲双胍和100μmol/L塞来昔布),药物作用72 h后,采用MTT法检测细胞的存活率,流式细胞仪检测细胞的周期变化和凋亡率,Western blotting检测PCNA、Cyclin D1、Bax和Bcl-2蛋白的表达。结果二甲双胍和塞来昔布均能够呈时间-剂量依赖性抑制SGC-7901细胞增殖。与对照组相比,各加药组细胞的存活率均明显降低(P0.05),且联合组细胞的存活率明显低于二甲双胍和塞来昔布单药处理组(P0.05)。二甲双胍和塞来昔布均可使SGC-7901细胞在G_0/G_1期所占百分比增加,S期百分比减少(P0.05),但二甲双胍对G_2期细胞无明显影响(P0.05),而塞来昔布可使G_2期细胞所占百分比降低(P0.05);两药联用可增强单药处理组对G_0/G_1期的阻滞(P0.05)。二甲双胍和塞来昔布单药处理组细胞的凋亡率明显高于对照组(P0.05),联合用药后细胞的凋亡率明显高于单药处理组(P0.05)。二甲双胍和塞来昔布均能使SGC-7901细胞中PCNA、Cyclin D1和Bcl-2表达降低,而Bax表达升高(P0.05);联合用药后,细胞中PCNA、Cyclin D1、Bax和Bcl-2的表达变化明显高于二甲双胍和塞来昔布的单药作用(P0.05)。结论二甲双胍和COX-2选择性抑制剂塞来昔布联合作用可协同抑制胃癌SGC-7901细胞增殖,促进细胞凋亡,其作用机制可能与下调PCNA、Cyclin D1、Bcl-2和上调Bax表达有关。     

Fe-NTA诱导的氧应激通过调节Bcl-2家族蛋白及线粒体膜电位影响人肝星状细胞和肝细胞的凋亡

目的研究Fe-NTA诱导的氧应激对人肝星状细胞(hepatic stellate cell,HSC)和人肝细胞凋亡的影响,并明确其机制与Bcl-2家族蛋白及细胞线粒体膜电位变化的关系.方法采用人肝星状细胞株及人肝细胞株张氏肝,取不同浓度的次氮基三乙酸铁(FeNTA)处理产生氧应激,测定超氧化物歧化酶(superoxide dismutase,SOD)和丙二醛(malondialdehyde,MDA);用Annexin V-FITC+PI双染色法测定Fe-NTA作用后两种细胞的凋亡率;用比色法检测细胞内Caspase 3活性的改变;用阳离子荧光染料JC-1染色,检测细胞内线粒体膜电位的改变;用RT-PCR检测抗凋亡基因Bcl-2和凋亡基因Bax的mRNA表达情况;用免疫印迹技术检测Bcl-2和Bax的蛋白表达情况.结果铁负载产生氧应激后,两种细胞中SOD水平均下降,MDA含量均升高,与对照组比较有显著差异;Fe-NTa诱导的氧应激不能使HSC发生凋亡,亦未能使HSC线粒体膜电位下降,反而使细胞内Caspase 3活性逐渐降低,抗凋亡基因Bcl-2的mRNA与蛋白表达水平升高,Bax的mRNA与蛋白表达水平降低;Fe-NTa诱导的氧应激使肝细胞发生凋亡增多,肝细胞内Caspase 3活性逐渐升高,同时线粒体膜电位下降,抗凋亡基因Bcl-2的mRNA与蛋白表达水平降低;Bax的mRNA与蛋白表达水平升高.结论 Fe-NTA诱导的氧应激通过调节Bcl-2家族蛋白及线粒体膜电位影响人肝星状细胞和肝细胞的凋亡,通过上调Bcl-2表达及下调Bax表达、维持线粒体膜电位不致崩溃、降低Caspase 3活性而抑制肝星状细胞的凋亡,而对人肝细胞起到相反的作用,诱导肝细胞凋亡.     

表没食子儿茶素没食子酸酯对人胃癌细胞株MKN45诱导凋亡作用的研究

目的了解表没食子儿茶素没食子酸酯（EGCG）是否诱导人胃癌细胞株MKN45凋亡及其凋亡信号传导途径，为其临床应用提供进一步的理论依据。方法用四甲基偶氮唑蓝（MTT）比色法检测EGCG对MKN45细胞生长的抑制作用；膜连蛋白V-异硫氰基荧光素（Annexin V-FITE）＋碘化丙啶（PI）方法测定EGCG作用后MKN45细胞的凋亡率；酶联免疫吸附测定（ELISA）检测EGCG对MKN45细胞内castmse-3活性的影响；Rhodamine123染色检测EGCG作用后MKN45细胞内线粒体膜电位的改变情况。结果EGCG作用后MKN45细胞发生凋亡，随着EGCG作用时间的延长及浓度的增加．凋亡率增加。在EGCG作用8h后MKN45细胞内的caspase-3的活性开始升高，并于作用12h后活性明显升高。线粒体的膜电位于EGCG作用4h后就开始明显下降，并与时间和浓度正相关。结论EGCG可以诱导人胃癌细胞株MKN45细胞凋亡，且与作用时间及浓度正相关。EGCG对MKN45细胞凋亡的诱导是通过线粒体途径发生的．     

苦荞麦总黄酮对软脂酸诱导的EA.hy926细胞Bcl-2表达的影响

目的研究苦荞麦总黄酮对软脂酸诱导的人脐静脉血管内皮细胞株(EA.hy926)Bcl-2表达的影响。方法苦荞麦总黄酮作用于高浓度软脂酸刺激下的EA.hy926细胞,RT-PCR技术检测Bcl-2 mRNA表达水平,免疫组织化学方法检测Bcl-2蛋白的表达情况。结果与对照组相比,模型组细胞Bcl-2 mRNA及蛋白表达显著降低(P<0.01);与模型组相比较,苦荞麦总黄酮组与二甲双胍组细胞Bcl-2 mRNA和蛋白表达水平明显升高(P<0.01);苦荞麦总黄酮组与二甲双胍组之间无显著差异(P>0.05)。结论苦荞麦总黄酮可以促进EA.hy926细胞Bcl-2基因及蛋白的表达发挥抑制凋亡的作用。     

runt相关转录因子3及其甲基化在人胃癌细胞中的表达及调节因素的初步研究

目的检测不同分化程度胃癌细胞株runt相关转录因子3（RUNX3）基因及其甲基化表达，观察RUNX3 mRNA再表达对胃癌细胞株生物学特性的影响。方法5-氮杂脱氧胞苷（5-AZA-dC）化学处理法和甲基化敏感性聚合酶链反应（MSP法）检测胃癌细胞RUNx3基因的甲基化状态；采用四甲基偶氮唑盐（MTT）实验检测5-氟尿嘧啶（5-FU）对5-AZA-dC处理前、后细胞株的生长抑制率，流式细胞术检测转化生长因子p1（TGF-p1）诱导凋亡的作用。结果①RUNX3在人胃癌细胞SGC7901、MKN45、BGC823中表达，而在MKN28中表达沉默，DNA异常甲基化仅存在于MKN28细胞；②5-AZA-dC处理后，MKN28细胞生长速度显著慢于未处理组，不同浓度5-FU对5-AZA-dC处理后MKN28的生长抑制率显著高于未处理组（P〈0．05）；③TGF-β1诱导5-AZA-dC处理前后MKN28细胞的早期凋亡具有时效性（P〈0．05），两者联用具有协同凋亡作用（P〈0．05）。结论DNA异常甲基化是MKN28细胞RUNX3表达沉默的重要机制；RUNX3甲基化可被去甲基化剂5-AZA-dC有效逆转；RUNx3mRNA的再表达可增强MKN28细胞对5-FU的敏感性和对TGF-β1诱导细胞凋亡的能力。     

二甲双胍对缺氧/复氧导致的乳鼠心肌细胞凋亡的影响

目的通过建立乳鼠心肌细胞缺氧/复氧损伤模型,观察二甲双胍对乳鼠心肌细胞凋亡的影响。方法选用原代培养72 h的乳鼠心肌细胞,随机分为4组:空白对照组、二甲双胍组、缺氧/复氧组、二甲双胍+缺氧/复氧组。流式细胞术检测各组细胞的凋亡率,荧光定量PCR检测各组细胞caspase-3 mRNA表达,酶联免疫法检测各组细胞胞浆内细胞色素C(CytC)的含量。结果与空白对照组相比,缺氧/复氧组细胞凋亡、caspase-3 mRNA表达、胞浆CytC的含量均明显增高(P0.05)。与缺氧/复氧组相比,二甲双胍+缺氧/复氧组细胞凋亡率、caspase-3 mRNA表达、CytC含量均明显降低(P0.05)。结论二甲双胍可以抑制caspase-3表达,进而减轻缺氧/复氧所致的心肌细胞凋亡,其机制可能与抑制mPTP的开放,减少线粒体内CytC的释放有关。     

Apoptotic effect of Epigallocatechin-3-gallate on the human gastric cancer cell line MKN45 via activation of the mitochondrial pathway

To investigate whether Epigallocatechin-3-gallate （EGCG） can induce apoptosis of the gastric cancer cell line MKN45 and its apoptotic pathway.METHODS： To determine this, apoptotic rates of MKN45 cells after EGCG treatment with or without caspase-3 inhibitor were evaluated by Annexin V-FITC ＋ PI staining The influence of EGCG on the activity of caspase-3 in the MKN45 cells was determined by ELISA. By Rhodamine123 staining, the membrane potential change of the mitochondrion was also investigated, and mRNAs and protein expression of the bcl-2 family were analyzed by RT-PCR and Western blot.RESULTS： EGCG can induce apoptosis of MKN45 cells in time- and dose-dependent manner. Eight hours after EGCG treatment, the activity of caspase-3 in the MKN45 increased, especially 12 h after treatment. The mitochondrial membrane potential was significantly weakened 4 h after EGCG insult. The mRNA and protein expression levels of pro-apoptotic members, such as Bax, Bid and Bad, were upregulated gradually as treated time increased. Moreover, the mRNA and protein expression levels of anti-apoptotic members, such as Bcl-xL and Bcl-2, were inhibited. CONCLUSION： These data support that EGCG can induce apoptosis of the human gastric cancer cell line MKN45, and the effect is in a time- and dose-dependent manner. The apoptotic pathway triggered by EGCG in MKN45 is mitochondrial-dependent.     

Astragalus extract inhibits destruction of gastric cancer cells to mesothelial cells by anti-apoptosis

AIM： To determine the inhibitory effect of Astragalus memebranaceushas on gastric cancer cell supernatant- induced apoptosis of human peritoneal mesothelial cells. METHODS： Human peritoneal mesothelial cell （HPMC） line HMrSV5 was co-incubated with gastric cancer cell supernatant （MKN45） and/or Astragalus memebranaceushas. Morphological changes in gastric cancer cells were observed under phase-contrast microscope. Quantitative cell damage was determined by MTT assay. Apoptosis was determined under transmission electron microscope and quantified by detectinr, acridine orange/ethidium bromide-stained （AO/EB） condensed nuclei under fluorescent microscope or by flow cytometry. Expressions of Bcl-2 and Bax were evaluated with immunostaining.     

Effect and mechanism of the Twist gene on invasion and metastasis of gastric carcinoma cells

AIM： To study the effect of the transfected Twist gene on invasion and metastasis of gastric carcinoma cells and the possible mechanisms involved. METHODS： Human gastric carcinoma MKN28 cells were stably transfected with Twist sense plasmid, and MKN45 cells were stably transfected with Twist antisense plasmid using the lipofectamine transfection technique. RT-PCR, Western blotting, EMSA, gelatin zymography assay, and in vitro invasion and migration assays were performed. Nude mice metastasis models were established by the abdominal cavity transfer method. RESULTS： Cell models （TwistS-MKN28） that steadily expressed high Twist protein were obtained. Compared with MKN28 and pcDNA3-MKN28 cells, adherence, migration and invasion ability of TwistS -MKN28 cells were clearly raised. The number of cancer nodules was increased significantly in the abdominal cavity and liver of nude mice inoculated with TwistS-MKN28 cells. Overexpression of Twist in MKN28 cells increased Tcf-4/ Lef DNA binding activity, and promoted expression of Tcf-4’s downstream target genes cyclin D1 and MMP-2. However, suppression of Twist （TwistAS-MKN45） inhibited MKN45 cell invasion and the expression of cyclin D1 was reduced. The activity of MMP-2 was also decreased. CONCLUSION： These results indicate that Twist promotes gastric cancer cell migration, invasion and metastasis, and Twist may play an important role in Wnt/ Tcf-4 signaling.     

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。     

厄洛替尼联合放疗对MKN45细胞株的影响

目的:观察厄洛替尼联合放疗对人胃癌MKN45细胞周期和凋亡的影响,了解厄洛替尼对放疗增敏的作用机制.方法:通过MTT法和集落形成实验,检测厄洛替尼和放射线对MKN45细胞的生长抑制作用,计算出半数抑制浓度(50%inhibitory concentration,IC50)和放射生物学参数平均致死剂量(mean lethal dose,D0)、准阈剂量(quasi-threshold,Dq)值,得出放射增敏比;流式细胞仪检测MKN45细胞经厄洛替尼及联合放射线处理后细胞的凋亡率及周期分布情况;Westernblot法检测厄洛替尼及联合放射线对MKN45细胞的Bax与Bcl-2蛋白表达的影响.结果:厄洛替尼及放射线均能抑制MKN45细胞的生长,随用药浓度或剂量的增高,抑制作用增强(P<0.01).厄洛替尼与放射线联合对MKN45细胞的抑制作用大于单药和单纯照射(P<0.01);两者联合使S期细胞比率明显降低,放射敏感的G2/M期和G0/G1期细胞比率明显增加(71.87±0.77vs60.72±0.26,P<0.01),细胞凋亡率增加;厄洛替尼联合放射线作用于细胞后,Bcl-2蛋白表达明显减少,Bax蛋白表达则明显增加.结论:厄洛替尼通过增加G2/M和G0/G1期细胞比率,降低Bcl-2、升高Bax蛋白表达,从而降低Bcl-2/Bax比率,增加细胞凋亡,以此提高MKN45细胞的放射敏感性.     

Effect of Helicobacter pylori infection on expression of Bcl-2 family members in gastric adenocarcinoma

AIM: To investigate the effect of Helicobacter pylori (H pylori) infection on the expressions of Bcl-2 family members in gastric adenocarcinoma. METHODS: Gastric adenocarcinoma and resection margin tissues of 95 patients were studied. Semi-quantitative RT-PCR was used to measure Bid, Bax and Bcl-2 mRNA expressions. RESULTS: Expressions of Bid and Bax in gastric adenocarcinoma tissues without H pylori infection, with cagA- H pylori infection and cagA+ H pylori infection increased significantly in turn (Bid, 0.304, 0.422 and 0.855 respectively, P<0.05; Bax, 0.309, 0.650 and 0.979 respectively, P<0.05). Bcl-2 mRNA levels increased significantly in gastric adenocarcinoma tissues with cagA- H pylori infection and cagA+ H pylori infection, compared with those without H pylori infection (0.696 and 0.849 vs 0.411, P<0.05). Expressions of Bid, Bax and Bcl-2 in resection margin tissues without H pylori infection, with cagA- H pylori infection and cagA+ H pylori infection increased significantly in turn (Bid, 0.377, 0.686 and 0.939 respectively, P<0.05; Bax, 0.353, 0.645 and 1.001 respectively, P<0.05; Bcl-2, 0.371, 0.487 and 0.619 respectively, P<0.05). In H pylori negative specimens, expressions of Bid and Bax correlated negatively with that of Bcl-2 respectively in adenocarcinoma tissues (Bid vs Bcl-2, r=-0.409, P<0.05; Bax vs Bcl-2, r=-0.451, P<0.05). In H pylori positive specimens, expressions of Bid and Bax did not correlate with that of Bcl-2 in adenocarcinoma tissues (Bid vs Bcl-2, r=0.187, P>0.05; Bax vs Bcl-2, r=0.201, P>0.05), but correlated positively with that of Bcl-2 respectively in resection margin tissues (Bid vs Bcl-2, r=0.331, P<0.05; Bax vs Bcl-2, r=0.295, P<0.05). CONCLUSION: H pylori may enhance Bid, Bax and Bcl-2 mRNA levels and cause deregulation of these apoptosis-associated genes expressions, which may play a role during development of gastric adenocarcinoma induced by H pylori.     

Effects of AZT and RNA-protein complex （FA-2-b-β） extracted from Liang Jin mushroom on apoptosis of gastric cancer cells

To investigate the synergistic effects of 3′-azido-3′- deoxythymidine （AZT） and FA-2-b-β extracted from Ling Jin mushroom on apoptosis of gastric cancer cells MKN45 in vitro. METHODS： Ml-I- analysis was made to examine the inhibition rate of MKN45 cells treated with AZT （2.5, 5, 10 and 20 mg/L） and FA-2-b-13 （5, 10, 20 and 40 mg/L） singly and combinatively for 24, 48 and 72 h. Apoptotic effects were evaluated by morphological methods, DNA agarose gel electrophoresis and flow cytometry, respectively. Telomerase activity was estimated by TRAP- ELISA. The mRNA expression of caspase-3 and Bcl-2 were detected by RT-PCR. RESULTS： AZT and FA-2-b-13 could significantly inhibit MKN45 cell proliferation and induce its apoptosis. MKN45 cells were inhibited in dose- and time- dependent manner. The inhibition effect of AZT combined with FA-2- b-β was obviously better than that used singly （0.469 ＋ 0.022 vs 1.075 4- 0.055, P 〈 0.05, 0.325 4- 0.029 vs 0.469 ＋ 0.022 P 〈 0.01）. AZT used singly and combination of FA-2-b-β could decrease the activity of tumor cell telomerase, and AZT has synergistic function with FA- 2-b-β. A certain concentration of AZT could up-regulate the expression of caspase-3 mRNA （r = 0.9969, P 〈 0.01）, which was positively related to apoptosis rate, and could down-regulate the expression of Bcl-2 mRNA, which was negatively related to apoptosis rate （r = 0.926, P 〈 0.01）. Furthermore, the effect of AZT combined with FA-2-b-13 was significantly higher than that used singly. CONCLUSION： Combination of AZT and FA-2-b-β has an obviously synergetic effect in the gastric cancer cells MKN45, which has provided a new approach to the treatment of gastric cancer clinically.