黄芩苷对肝癌细胞SMMC-7721JAK-STAT-号通路STAT3的影响

目的:探讨黄芩苷对肝癌细胞SMMC-7721JAK-STAT信号通路STAT3的影响.方法:将肝癌细胞SMMC-7721分为4组:对照组、黄芩苷组、AG490组、黄芩苷+AG490组.应用RT-PCR法检测各组肝癌细胞SMMC-7721中STAT3 mRNA表达,Western blot法检测肝癌细胞SMMC-7721...     

AG490联合健择对人胰腺癌细胞生长的影响

目的:探讨Janus激酶(JAK)特异性抑制剂AG490联合化疗药物健择对人胰腺癌细胞系SW1990的生长增殖及STAT3转导通路的影响和其机制.方法:人胰腺癌细胞系SW1990分为对照组、AG490组、健择组及AG490 健择处理组.培养48 h后,MTT法检测细胞增殖状态,流式细胞仪检测细胞凋亡.Western blot和RT-PCR检测STAT3,Cyclin D1,Bcl-xL,Bax,Survivin的表达情况.结果:AG490组和健择组的细胞增殖明显低于对照组(2.20±0.25,2.30±0.220 vs 3.78±0.42,P<0.05),凋亡率明显高于对照组(35.40%±3.08%,34.64%±1.38% vs 16.49%±1.45%,P<0.05)。并且,AG490 健择组细胞增殖(1.49±0.15)明显低于明显低于AG490或健择组(P<0.05),而凋亡率(43.80%±1.57%)则明显高于AG490或健择组(P<0.05).AG490处理SW1990 48 h后,p-STAT3表达明显低于对照组(13.83%±0.64% vs 79.87%±1.43%,P<0.05),同时Cyclin D1(mRNA:15.63%±0.59% vs 43.83%±0.64%,P<0.05:蛋白:17.50%±0.92% vs 49.87%±1.27%,P<0.05),Bcl-xL(mRNA:13.93%±0.21% vs 75.70%±0.46%,P<0.05:蛋白:34.17%±1.70% vs 83.93%±0.80%,P<0.05)和Survivin(mRNA:58.27%±0.42% vs 82.93%±1.68%,P<0.05:蛋白:13.23%±1.03% vs 18.60±1.08%,P<0.05)表达也明显降低,而Bax的表达则明显增高(mRNA:10.33%±1.18% vs 5.43%±0.70%,P<0.05:蛋白:13.07%±1.04% vs 6.23%±2.40%,P<0.05),健择处理组上述指标与对照组相似.结论:阻断STAT3信号转导通路可以抑制人胰腺癌细胞增殖,促进其凋亡,健择联合AG490能起协同作用.AG490联合健择可能为胰腺癌治疗提供新的思路.     

黄芩苷对肝癌细胞GJIC及Cx26、Cx43表达的影响

目的:探讨黄芩苷对肝癌细胞缝隙连接细胞间通讯(gap junction intercellular communication,GJIC)及细胞间隙连接蛋白26(connexion26,Cx26)、细胞间隙连接蛋白43(connexion43,Cx43)表达的影响.方法:人肝癌细胞株SMMC-7721分为黄芩苷10、20、40mg/L组和对照组.划痕染料示踪技术检测GJIC的变化.用RT-PCR法检测肝癌细胞Cx26、Cx43基因表达,用Westernblot法检测Cx26蛋白表达,用免疫细胞化学检测Cx43蛋白表达.结果:对照组细胞的染料局限于划痕两侧的细胞内,无明显的荧光染料传输现象.随着黄芩苷浓度的增强,LY染料传输范围逐渐增大.黄芩苷10、20、40mg/L各浓度组Cx26mRNA表达水平与对照组比较显著提高(0.148±0.111,10.253±0.222,17.283±0.024vs0.138±0.111;P<0.05).Cx26蛋白表达量与对照组比较明显增加(0.516±0.029,0.759±0.020,1.019±0.076vs0.367±0.029;P<0.05).黄芩苷各浓度组Cx43mRNA表达量与对照组比较无显著变化.而Cx43蛋白的表达水平与对照组比较明显增加(5.512±0.003,5.844±0.046,6.216±0.015vs4.316±0.032;P<0.05).结论:黄芩苷促进肝癌细胞Cx26及Cx43表达,导致肝癌细胞GJIC功能的恢复,这很可能是黄芩苷抑制肿瘤生长的分子机制之一.     

细胞周期依赖性蛋白激酶对体外培养人肝癌细胞侵袭力的影响

目的:探讨CDKs对体外培养的人肝癌细胞SMMC-7721侵袭力的影响及其分子机制.方法:将细胞分为A、B两组(A组用终浓度为0μmol/L Roscovitine.B组用终浓度为32μmol/L Roscovitine,均培养24 h),采用流式细胞术检测PACDKs特异性抑制剂Roscovitine干预后的人肝癌细胞SMMC-7721的细胞周期,并用Transwell小室、划痕实验、PCR技术分别检测处于不同细胞周期下的人肝癌细胞侵袭能力、水平运动能力及uPA、MMP-9mRNA表达.结果:经终浓度为32μmol/L的Roscovitine干预24 h后的人肝癌细胞SMMC-7721处于G0/G1期细胞比例迅速升高(72.19%±0.47%vs 59.22%±0.54%,P<0.05),细胞侵袭能力下降,穿膜细胞数明显减(71.40±5.59 vs 149.60±16.36,P<0.05);细胞水平运动能力明显下降(P<0.05);uPA mRNA的表达下降、但MMP-9mRNA的表达却无明显变化.结论:Roscovitine干预使人肝癌细胞SMMC-7721侵袭能力和水平运动能力下降,其机制可能与肝癌细胞周期时相分布发生改变和uPAmRNA的表达下降有关.     

VEGF促进肝癌SMMC-7721细胞侵袭性的自分泌机制

目的:探讨促血管内皮生长因子(VEGF)对人肝癌细胞SMMC-7721侵袭力以及对该细胞中基质金属蛋白酶9(MMP-9)的影响,初步研究VEGF对肿瘤侵袭和转移的影响及可能的作用机制.方法:使用VEGF体外培养人肝癌SMMC-7721细胞,通过细胞体外侵袭实验检测细胞侵袭能力的改变,再分别使用30μg/L、10μg/LVEGF培养人肝癌SMMC-7721细胞,以正常培养人肝癌SMMC-7721细胞为空白对照组.使用半定量RT-PCR和Western blot法对3组细胞中MMP-9的mRNA和蛋白表达水平进行分析.结果:细胞体外侵袭实验显示,外加VEGF培养后,细胞侵袭力明显增强(P0.01);MMP-9mRNA和蛋白的表达在外加VEGF组中要明显高于空白对照组(0.479±0.025,0.665±0.024vs 0.315±0.022;0.521±0.026,0.662±0.026vs 0.366±0.025,均P<0.01),且高浓度和低浓度组之间也有明显差别.结论:肝癌SMMC-7721细胞系中存在有自分泌机制,VEGF可通过自分泌机制上调肝癌细胞的MMP-9表达,进而促进肿瘤的浸润转移.     

葡萄糖调节蛋白78在棕榈酸诱导肝癌细胞凋亡过程中的作用

目的探讨葡萄糖调节蛋白(GRP)78在棕榈酸(PA)诱导肝癌细胞凋亡中的作用。方法选取人肝癌细胞SMMC-7721,分为对照组和PA组;采用光学显微镜观察两组细胞死亡情况,采用反转录PCR检测两组GRP78 mRNA表达;同时将肝癌细胞分为对照组、空白载体组和GRP78载体转染组,其中GRP78载体转染组转染高表达GRP78质粒,空白载体组转染空白质粒,采用Western印迹检测GRP78蛋白表达情况,采用流式细胞术检测细胞凋亡情况。结果肝癌细胞SMMC-7721在PA刺激下,24 h后死亡细胞明显增多;PA组肝癌细胞SMMC-7721 GRP78 mRNA相对表达量为(3.014±0.447),明显高于对照组的1.012±0.322(P<0.05);GRP78载体转染组GRP78蛋白相对表达量明显高于对照组和空白载体组,细胞凋亡率明显低于对照组和空白载体组(均P<0.05)。结论高表达GRP78可抑制PA诱导的肝癌细胞凋亡。     

NRF2/PI3K通路介导肝癌细胞SMMC-7721出现索拉非尼耐药的机制研究

目的探讨NRF2PI3K通路介导肝癌细胞SMMC-7721出现索拉非尼耐药的机制研究。方法建立肝癌细胞系SMMC-7721耐药细胞株SMMC-7721-SR,构建NRF2-siRNA转染肝癌细胞,并给与10μmol/L索拉非尼处理48 h。采用CCK-8法检测细胞活力,采用流式细胞仪检测细胞凋亡,Western blot检测NRF2、Keap1、ARE、p-PI3K和p-Akt蛋白表达水平。Real-Time PCR检测NRF2、Keap1、ARE、p-PI3K和p-Akt基因表达水平。结果索拉非尼明显抑制肝癌细胞SMMC-7721的存活率,促进肝癌细胞SMMC-7721凋亡发生(P0.05)。索拉非尼对SMMC-7721细胞促凋亡作用明显强于SMMC-7721-SR细胞(P0.05)。SMMC-7721-SR细胞中NRF2蛋白水平及mRNA表达明显高于SMMC-7721细胞,Keap1、ARE、PI3K和Akt蛋白水平及mRNA表达明显增加(P0.05)。索拉非尼明显上调SMMC-7721细胞中NRF2蛋白水平及mRNA表达(P0.05)。抑制NRF2 mRNA表达并给予索拉非尼处理后,SMMC-7721-SR细胞存活率明显降低,凋亡率显著升高,Keap1、ARE、p-PI3K和p-Akt蛋白水平及mRNA表达明显降低(P0.05)。结论索拉非尼激活NRF2后诱导肝癌细胞SMMC-7721出现耐药;抑制NRF2可逆转肝癌细胞SMMC-7721对索拉非尼的耐药情况。     

XPD对SMMC-7721肝癌细胞中DNp73和GADD45β的调控及意义

目的:观察人剪切修复基因人类着色性干皮病D组基因(xeroderma pigmentosum group D,XPD)转染至人肝癌细胞株SMMC-7721细胞后XPD、DNp73和GADD45β基因的表达变化以及对肝癌细胞生长的影响.方法:实验分4组:重组质粒SMMC-7721-pEGFP-N2-XPD(XPD组)、空载质粒SMMC-7721-pEGFP-N2组(N2组),脂质体组和SMMC-7721细胞空白对照组.应用Lipofectamine2000脂质体瞬时转染,逆转录聚合酶链反应(RT-PCR)和蛋白印迹(Western blot)法检测转XPD基因后,人肝癌细胞株SMMC-7721细胞中DNp73以及GADD45β的mRNA和蛋白质的表达量变化,并用四甲基偶氮唑盐(MTT)法检测细胞增殖的活力,流式细胞仪检测细胞凋亡的变化.结果:荧光显微镜下,XPD组和N2组细胞中观察到绿色荧光蛋白表达,说明转染成功;RT-PCR检测显示:XPD组中DNp73 mRNA相对表达量较其他3组显著下调,XPD和GADD45βmRNA相对表达量较其他3组明显上调(均P<0.01);Western blot检测显示:XPD、DNp73以及GADD45β蛋白相对表达量在各组间的差异与其mRNA各组间差异一致;MTT检测示:SMMC-7721细胞空白对照组、脂质体组、N2组、XPD组的吸光度(A)值分别为0.633±0.012,0.623±0.009,0.628±0.016,0.384±0.011,XPD组低于其他3组,差异均有统计学意义(均P<0.01),表明转染XPD后SMMC-7721细胞的增殖能力减弱.流式细胞仪检测SMMC-7721肝癌细胞凋亡:转染XPD的SMMC-7721细胞凋亡显著,凋亡率达56.53%,而其他3组均未见明显凋亡.结论:XPD基因在肝癌的发生发展中起抑制作用,癌基因DNp73的表达随XPD表达增加而降低,抑癌基因GADD45β则随XPD表达增加而增加,提示两者可能在XPD抑制肝癌细胞的生长机制中起重要作用.     

共轭三烯酸抑制肝癌细胞体外增殖和凋亡诱导的作用

目的: 探讨共轭三烯酸抑制肝癌细胞体外增殖的作用机制.方法:采用细胞增殖试验(MTT法)、克隆形成试验、Brdu掺入实验(20 g/L, 12 h)研究共轭三烯酸对人正常肝细胞L-02, 人肝癌细胞系SMMC-7721和鼠肝癌细胞系Hepa1-6的体外增殖抑制作用;Hoechst33342荧光染色, 流式细胞术检测细胞凋亡和细胞周期分布.结果: 共轭三烯酸处理后, 肿瘤细胞增殖活性降低(SMMC-7721: 1.5±2.6 vs 1.9±12.3, P<0.05;Hepa1-6: 1.0±1.5 vs 1.2±9.7, P<0.05), 克隆形成下降(SMMC-7721: 149.3±3.1 vs 191.7±5.8, P<0.05;Hepa1-6: 32.7±3.1 vs 61.3±4.2, P<0.05), Brdu标记指数降低(SMMC-7721: 42.3%±1.5% vs 63.6%±0.7%, P<0.05;Hepa1-6: 59.5%±0.7% vs 79.6%±1.6%, P<0.05), 凋亡细胞增多(SMMC-7721: 48.9%±0.7% vs 9.9%±0.4%, P<0.05;Hepa1-6: 65.1%±1.1% vs 15.9%±0.7%, P<0.05);凋亡指数升高(SMMC-7721: 16.3%±0.7% vs 3.3%±0.4%, P<0.05;Hepa1-6: 21.7%±1.1% vs 5.3%±0.4%, P<0.05), G0/G1期细胞数增加(SMMC-7721: 48.4%±1.8% vs 38.0%±2.1%, P<0.01;Hepa1-6: 53.4%±2.1% vs 41.1%±0.7%, P<0.01), S期细胞数减少(SMMC-7721: 32.2%±2.9% vs 37.2%±1.9%, P<0.05;Hepa1-6: 28.3%±0.9% vs 39.9%±0.9%, P<0.01).结论:共轭三烯酸对肿瘤细胞的增殖有显著抑制作用, 其作用机制可能为抑制肿瘤细胞DNA合成, 诱导肿瘤细胞凋亡及细胞周期阻滞.     

肺腺癌细胞中STAT3表达和活性变化对细胞生长及药物敏感性的影响

目的探讨STAT3表达和活性变化对细胞生长及化疗药物敏感性的影响。方法采用AG490处理细胞、SOCS3基因转染A549细胞后,Western blot检测STAT3蛋白酪氨酸磷酸化水平变化;MTT法检测细胞增殖情况;不同浓度泰素处理细胞后观察细胞对药物的敏感性。结果AG490处理细胞、SOCS3基因转染细胞后,Western blot证实其能显著抑制STAT3蛋白酪氨酸磷酸化水平（P〈0．01）;MTT法结果示细胞增殖明显受到抑制;细胞对泰素敏感性增高。结论AG490、SOCS3能抑制A549细胞中STAT3活性,抑制A549细胞增殖并增加其对化疗药物的敏感性。     

AG490对胃癌细胞株SGC-7901细胞周期、凋亡和STAT3表达的影响

背景：JAK2酪氨酸激酶特异性抑制剂AG490可抑制胃癌细胞生长,但目前对其作用机制还知之甚少。目的：探讨AG490对胃癌细胞株SGC-7901细胞周期、凋亡和STAT3 mRNA表达的影响。方法：以不同浓度AG490处理胃癌细胞株SGC-7901,流式细胞术检测细胞周期和凋亡情况,RT-PCR法检测STAT3 mRNA表达。结果：胃癌细胞株SGC-7901经AG490作用48 h后,100μmol/L组的S期、G2/M期细胞比例显著增加（P〈0.01）,1μmol/L组和10μmol/L组仅G2/M期细胞比例显著下降（P〈0.05）。AG490作用48h后,各浓度组的细胞凋亡率均显著增加（P〈0.01）。AG490作用24 h和48 h后,各浓度组的STAT3 mRNA表达均无明显变化（P〉0.05）。结论：AG490可影响胃癌细胞株SGC-7901的细胞周期并诱导细胞凋亡,但不影响STAT3 mRNA的表达。     

丙戊酸钠对肝癌SMMC-7721细胞增殖和细胞周期的影响及机制

目的:探讨丙戊酸钠(VPA)对人肝癌SMMC-7721细胞增殖、细胞周期及对p21WAF1/CIP1mRNA表达的影响.方法:实验分为空白对照组、PBS组、VPA0.2mmol/L组、VPA1.0mmol/L组和VPA5.0mmol/L组.不同浓度VPA干预人肝癌SMMC-7721细胞24h、48h和72h,采用MTT法检测细胞存活率,流式细胞仪检测细胞周期;干预72h后,用Real-timePCR法检测VPA干预72h后p21WAF1/CIP1mRNA的表达情况.结果:与空白对照组及PBS组比较,不同浓度的VPA作用24h,48h及72h时组肝癌SMMC-7721细胞增殖均出现了不同程度抑制(请将具体数据列出来P<0.05),随着VPA药物浓度升高,细胞增殖抑制作用逐渐增强,随作用时间延长,抑制程度逐渐增强(P<0.05).随药物浓度升高,G1期细胞比例逐渐增多,S期细胞比例逐渐减少,细胞发生G0/G1期阻滞.VPA干预肝癌SMMC-7721细胞72h后,VPA组p21WAF/CIP1mRNA表达较空白对照组及PBS组表达明显升高(请将具体数据列出来P<0.01).结论:VPA可抑制人肝癌SMMC-7721细胞的增殖,且呈时间及剂量依赖性,并诱导出现G0/G1细胞周期阻滞,同时上调p21WAF1/CIP1mRNA的表达.     

STAT3在对乙酰氨基酚所致小鼠肝损伤后肝细胞再生中的作用

目的探讨STAT3在对乙酰氨基酚(APAP)致小鼠肝细胞损伤后肝细胞增殖中的作用。方法体外培养小鼠正常肝细胞AML12,APAP(1、2.5、5、10、20 mmol/L)刺激12、24或48 h,等体积PBS作为对照组。筛选出最佳刺激浓度和作用时间后,AG490(10、50、100μmol/L)作用AML12。CCK8法检测AML12细胞活力。RT-PCR检测AML12中PCNA、CyclinD1、Ki67的mRNA表达水平。Western Blot法检测STAT3、p-STAT3及PCNA、CyclinD1表达水平。计量资料多组间比较采用单因素方差分析,进一步两两比较采用LSD-t检验。结果APAP作用24 h及48 h后,与对照组比较,各浓度组AML12细胞活力均降低(P值均<0.05);APAP浓度为2.5 mmol/L时,细胞活力分别为0.717±0.027、0.752±0.014,与对照组比较差异均有统计学意义(P值均<0.05),能够满足后续实验条件。与对照组比较,24 h APAP(2.5 mmol/L)组PCNA、CyclinD1及Ki67 mRNA的表达均降低(P值均<0.01);与24 h APAP组比较,48 h APAP(2.5 mmol/L)组PCNA、CyclinD1及Ki67 mRNA的表达均升高(P<0.01),因此选择APAP 2.5 mmol/L、刺激时间48 h来模拟体外损伤AML12细胞后肝细胞再生的模型。加入AG490,与对照组比较,10、50μmol/L AG490组细胞活力变化无统计学意义,余各组细胞活力均降低(P值均<0.01);与APAP组比较,AG490(50μmol/L)+APAP组和AG490(100μmol/L)+APAP组细胞活力降低(P值均<0.01),因此选择50μmol/L AG490作为后续实验处理浓度。与对照组比较,APAP组p-STAT3的蛋白水平升高(P<0.01),而AG490组、APAP+AG490组降低(P值均<0.05);与APAP组比较,APAP+AG490组PCNA、CyclinD1蛋白水平及PCNA、CyclinD1、Ki67 mRNA表达均降低(P值均<0.05)。结论STAT3参与APAP诱导小鼠肝细胞损伤后的细胞增殖,而AG490作为STAT3抑制剂通过抑制STAT3磷酸化从而抑制APAP肝损伤后肝细胞增殖。     

Signal transducer and activator of transcription 3 is involved in the cardioprotective signalling pathway activated by insulin therapy at reperfusion

OBJECTIVE: To evaluate the significance of the JAK-STAT pathway in insulin-induced cardioprotection from reperfusion injury. METHODS: In isolated perfused rat hearts subjected to insulin therapy (0.3 mU/ml) +/- AG490 (5 microM, JAK-STAT inhibitor), the phosphorylation state of STAT3 and Akt was determined after 15 min of reperfusion. Infarct size was measured after 120 min of reperfusion. Isolated cardiac myocytes from wild type (WT) and cardiac specific STAT3 deficient mice were treated with insulin at reoxygenation following simulated ischemia (SI, 26 h). Cell viability was measured after 120 min of reoxygenation following SI, whereas phosphorylation state of Akt was measured after 15 min of reoxygenation following SI. RESULTS: Insulin given at reperfusion led to phosphorylation of STAT3 and Akt both of which were inhibited by AG490. AG490 also blocked the insulin-dependent decrease in infarct size, supporting a role for JAK-STAT in cardioprotection. In addition, insulin protection from SI was blocked in myocytes from the STAT3 deficient mice, or in WT mice treated with AG490. Furthermore, insulin failed to phosphorylate Akt in the STAT3 deficient cardiomyocytes. CONCLUSION: Insulin-induced cardioprotection at reperfusion occurs through activation of STAT3. Inhibiting STAT3 by AG490, or STAT3 depletion in cardiac myocytes affects activation of Akt, suggesting close interaction between STAT3 and Akt in the cardioprotective signalling pathway activated by insulin treatment at reperfusion.     

siRNA沉默Cyclin E基因对肝癌HepG2、SMMC-7721和BEL-7402细胞增殖和侵袭能力的影响

目的:观察siRNA沉默Cyclin E基因表达对肝癌HepG2、SMMC-7721和BEL-7402细胞增殖和侵袭能力的影响.方法:构建2个靶向Cyclin E基因siRNA载体,转染人肝癌HepG2、SMMC-7721和BEL-7402细胞.RT-PCR、Western blot检测转染后HepG2、SMMC-7721和BEL-7402细胞Cyclin E基因mRNA和蛋白表达水平.CCK-8试验、软琼脂克隆形成实验检测HepG2、SMMC-7721和BEL-7402细胞增殖、克隆形成能力.流式细胞术、transwell试验分别检测HepG2、SMMC-7721和BEL-7402细胞周期和侵袭能力.结果:构建的2个Cyclin E基因siRNA载体插入序列与所设计序列均一致;转染HepG2、SMMC-7721和BEL-7402细胞后,干扰1组、干扰2组与空白对照组和阴性对照组比较,C y c l i n E m R N A和蛋白表达量均显著降低(P<0.05),细胞生长速度延缓,软琼脂细胞集落形成数、穿透细胞数均显著降低(P<0.05),S和G2/M期细胞比例减少,G0/G1期细胞比例增加.结论:沉默肝癌细胞Cyclin E表达水平,可有效抑制细胞生长、增殖和侵袭能力.     

Expression of angiostatin cDNA in human hepatocellular carcinoma cell line SMMC-7721 and its effect on implanted carcinoma in nude mice

AIM: To transfect murine angiostatin cDNA into human hepatocellular carcinoma cell line SMMC-7721 and to investigate its effects on implanted carcinoma in nude mice. METHODS: A eukaryotic expression vector of pcDNA3.1-mAST containing murine angiostatin was constructed. Then pcDNA3.1-mAST plasmid was transfected into cell line SMMC-7721 by Lipofectamine. The resistant clone was screened by G418 filtration and identified by RT-PCR and Western blotting. Nude mice were divided into three groups of 10 each. Mice in blank control group were only injected with SMMC-7721 cells. Mice in vector control group were injected with SMMC-7721 cells transfected with pcDNA3.1 (+) vector, whereas mice in angiostatin group were injected with SMMC-7721 cells transfected with pcDNA3.1-mAST plasmid. Volume, mass and microvessel density (MVD) of the tumors in different groups were measured and compared. RESULTS: Murine angiostatin cDNA was successfully cloned into the eukaryotic expression vector pcDNA3.1 (+). pcDNA3.1-mAST was successfully transfected into SMMC-7721 cell line and showed stable expression in this cell line. No significant difference was observed in the growth speed of SMMC-7721 cells between groups transfected with and without angiostatin cDNA. Tumor volume, mass and MVD in the angiostatin group were significantly lower than those in the blank control group and vector control group (P<0.01). The inhibitory rate of tumor reached 78.6%. Mass and MVD of the tumors only accounted for 34.6% and 48.9% respectively of those in the blank control group. CONCLUSION: Angiostatin cDNA could be stably expressed in human hepatocellular carcinoma cell line SMMC-7721 without obvious inhibitory effects on the growth of SMMC-7721 cells. When implanted into nude mice, SMMC-7721 cells transfected with angiostatin cDNA show a decreased tumorigenic capability. It suggests that angiostatin can inhibit tumor growth through its inhibition on angiogenesis in tumors.     

双萘酰亚胺类化合物诱导SMMC-7721细胞凋亡的研究

目的 观察双萘酰亚胺类化合物(C8)对人肝癌细胞株SMMC-7721细胞的作用. 方法 四甲基偶氮唑盐法检测C8对SMMC 7721细胞的抑制情况;流式细胞术检测细胞周期和凋亡率;Western blot检测Bcl 2蛋白表达量;流式细胞术分析细胞内Bcl 2蛋白量;酶联免疫法检测Caspase9和Caspase 3表达量. 结果 C8抑制SMMC 7721细胞增殖,半数抑制浓度为15 umol/L.C8作用浓度在10,15、20 umol/L时,SMMC 7721细胞的凋亡比例分别为16.8%、29.4%和35.8%,对照组为2.1%,SMMC 7721细胞的凋亡率明显高于对照组,P<0.01.细胞内Bcl-2蛋白表达水平下降.酶联免疫检测结果表明Caspase 9和Caspase 3被活化.结论 C8可诱导人肝癌SMMC 7721细胞的凋亡,为抗肿瘤药物的研究提供新的化合物.     

Adhesion of different cell cycle human hepatoma cells to endothelial cells and roles of integrin β1

AIM: To investigate the adhesive mechanical properties of different cell cycle human hepatoma cells (SMMC-7721)to human umbilical vein endothelial cells (ECV-304),expression of adhesive molecule integrinβ1 in SMMC-7721cells and its contribution to this adhesive course.METHODS: Adhesive force of SMMC-7721 cells to endothelialcells was measured using micropipette aspiration technique.Synchronous G1 and S phase SMMC-7721 cells wereachieved by thymine-2-deoxyriboside and colchicinessequential blockage method and double thymine-2-deoxyriboside blockage method, respectively. Synchronousrates of SMMC-7721 cells and expression of integrinβ1 inSMMC-7721 cells were detected by flow cytometer.RESULTS: The percentage of cell cycle phases of generalSMMC-7721 cells was 11.01% in G2/M phases, 53.51% inG0/G1 phase, and 35.48% in S phase. The synchronous ratesof G1 and S phase SMMC-7721 cells amounted to 74.09%and 98.29%, respectively. The adhesive force of SMMC-7721cells to endothelial cells changed with the variations ofadhesive time and presented behavior characteristics ofadhesion and de-adhesion. S phase SMMC-7721 cells had higheradhesive forces than G1 phase cells [(307.65±92.10)× 10-10Nvs (195.42±60.72)×10-10N, P＜0.01]. The expressivefluorescent intensity of integrinβ1 in G1 phase SMMC-7721cells was depressed more significantly than the values ofS phase and general SMMC-7721cells. The contribution ofadhesive integrinβ1 was about 53% in this adhesive course.CONCLUSION: SMMC-7721 cells can be synchronizedpreferably in G1 and S phases with thymine-2-deoxyribosideand colchicines. The adhesive molecule integrinβ1 expressesa high level in SMMC-7721 cells and shows differences invarious cell cycles, suggesting integrin β1 plays an importantrole in adhesion to endothelial cells. The change of adhesiveforces in different cell cycle SMMC-7721 cells indicatesthat S phase cells play predominant roles possibly whilethey interact with endothelial cells.