曲古菌素A对人胰腺癌PaTu-8988细胞增殖和细胞周期的影响

目的 观察曲古菌素A(tfichostatin A,TSA)对人胰腺癌PaTu-8988细胞增殖及细胞周期的影响.方法 不同浓度(0.1、0.5、2.0 μmol/L)TSA处理人胰腺癌PaTu-8988细胞,并设空白对照组.采用WST-8法检测细胞存活率;流式细胞仪检测细胞周期的变化;实时定量PCR检测细胞周期相关基因p21和cyclin DI mRNA的表达.结果 对照组、TSA 0.1μmol/L、0.5μmol/L和2.0μmol/L组的细胞存活率分别为(100.0±4.2)%、(88.5±4.2)%、(79.7±5.0)%和(64.3±7.2)%,各TSA组均显著低于对照组(P<0.01).TSA 0.1μmoL/L、0.5μmol/L组的细胞以G1期居多,2.0μmol/L组(50.29±7.53)%细胞阻滞在G2/M期.TSA各组p21 mRNA表达值分别为5.29±1.16、7.79±0.41、8.61±0.73,较对照组l,00±0.08显著升高(P<0.01);cyclin DI mRNA表达值分别为1.13±0.12、0.42±0.06、0.19±0.06,较对照组1.00±0.07表达降低(P<0.05).结论 TSA通过上调p21及下调cyclin D1基因的表达,导致细胞周期阻滞.     

曲古抑菌素A对胃癌细胞生长的抑制作用

目的: 研究组蛋白去乙酰化酶抑制剂-曲古抑菌素A(trichostatin A, TSA)对胃癌细胞系SGC-7901的生长抑制作用, 证实该作用是通过促使细胞凋亡而实现的.方法: 用不同浓度(0.2、0.4和0.8 mg/L)和不同作用时间(24、48和72 h)的TSA作用于SGC-7901细胞, 采用MTT法观察TSA对SGC-7901细胞增殖的抑制作用;通过流式细胞仪检测细胞周期和凋亡率的变化;通过透射电镜观察细胞超微结构的变化.结果: TSA可抑制胃癌SGC-7901细胞的生长,且这种作用呈时间和剂量依赖关系. 当TSA作用浓度分别为0.2、0.4和0.8 mg/L时, 与SGC-7901细胞均作用72 h, TSA对SGC-7901细胞生长的抑制率分别为25%±1.2%, 45%±1.4%和73%±1.7%, 各组均与TSA 0.2 mg/L组比较, 差异显著( P<0.05). 当0.8 mg/L TSA分别与SGC-7901细胞作用24、48和72 h, TSA对SGC-7901细胞生长的抑制率分别为21%±1.1%, 37%±2.0%和73%±1.7%, 各组均与TSA作用24 h组比较, 差异显著( P<0.05). TSA可延缓细胞周期, 具有明显的诱导细胞凋亡作用. 电镜下见细胞染色质凝聚成段片状, 细胞核固缩断裂, 核膜破裂, 细胞器及胞膜自溶, 凋亡小体形成.结论: TSA通过诱导细胞周期阻止和凋亡来抑制胃癌细胞系SGC-7901的生长, 且这种作用呈时间和剂量依赖性, 为TSA用于胃癌的治疗提供理论依据.     

过氧化物酶体增殖剂激活受体-γ在白藜芦醇抑制胃癌SGC-7901细胞增殖中的作用

目的:探讨过氧化物酶体增殖剂激活受体-γ(PPAR-γ)在白藜芦醇(Res)抑制人胃癌细胞SGC-7901增殖中的作用.方法:体外常规培养人胃癌细胞SGC-7901,MTT法检测Res和GW9662(PPAR-γ特异阻断剂)对SGC-7901细胞的增殖抑制作用,流式细胞仪测定对细胞周期的影响,RT-PCR方法检测PPAR-γ,Cyclin D1的mRNA表达,Western blot检测PPAR-γ蛋白的表达,免疫细胞化学检测Cyclin D1蛋白表达的改变.结果:Res以时间、浓度依赖性方式抑制胃癌细胞SGC-7901的增殖(P<0.05),使细胞周期停留在G1期;胃癌细胞SGC-7901存在PPAR-γmRNA和蛋白的表达,Res呈浓度依赖性的激活PPAR-γmRNA的转录.25,50,75,100μmol/L Res作用于胃癌细胞后,细胞中PPAR-γmRNA相对表达分别是空白对照组的122.2%,195.1%,232.9%和277.1%(P<0.05),而PPAR-γ蛋白的表达几乎没有变化;胃癌SGC-7901细胞高水平表达Cvclin D1,Res显著的抑制Cyclin D1的表达.经25,50,75,100μmol/L Res处理后,Cyclin D1 mRNA抑制率分别为11.3%,24.3%,35.4%,59.5%,而GW9662能够明显降低Res的上述作用.结论:Res在胃癌SGC-7901细胞中部分的通过激活PPAR-γ从而抑制Cyclin D1的表达,使癌细胞停留在G1期,抑制细胞的增殖.     

过氧化物酶体增殖剂激活受体-γ在白藜芦醇抑制胃癌SGC-7901细胞增殖中的作用

目的探讨过氧化物酶体增殖剂激活受体-γ(PPAR-γ)在白藜芦醇(Res)抑制人胃癌细胞SGC-7901增殖中的作用.方法体外常规培养人胃癌细胞SGC-7901,MTT法检测Res和GW9662(PPAR-γ特异阻断剂)对SGC-7901细胞的增殖抑制作用,流式细胞仪测定对细胞周期的影响,RT-PCR方法检测PPAR-γ,Cyclin D1的mRNA表达,Western blot检测PPAR-γ蛋白的表达,免疫细胞化学检测Cvclin D1蛋白表达的改变.结果Res以时间、浓度依赖性方式抑制胃癌细胞SGC-790l的增殖(P＜0.05),使细胞周期停留在G1期;胃癌细胞SGC-7901存在PPAR-γmRNA和蛋白的表达,Res呈浓度依赖性的激活PPAR-γ mRNA的转录.25,50,75,100μmol/L Res作用于胃癌细胞后,细胞中PPAR-γmRNA相对表达分别是空白对照组的122.2%,195.1%,232.9%和277.1%(P＜0.05),而PPAR-γ蛋白的表达几乎没有变化;胃癌SGC-7901细胞高水平表达Cyclin D1,Res显著的抑制Cyclin D1的表达.经25,50,75,100 μmol/LRes处理后,Cyclin D1 mRNA抑制率分别为11.3%,24.3%,35.4%,59.5%,而GW9662能够明显降低Res的上述作用.结论Res在胃癌SGC-7901细胞中部分的通过激活PPAR-γ从而抑制Cvclin D1的表达,使癌细胞停留在G1期,抑制细胞的增殖.     

5-氮杂-2'-脱氧胞苷对人胃癌SGC-7901细胞株生长及EDNRB基因启动子异常甲基化的影响

目的:探讨去甲基化药物5-氮杂-2'-脱氧胞苷(5-Aza-CdR)对人胃癌细胞系SGC-7901细胞株的生长及EDNRB基因启动子异常甲基化的影响.方法:使用1、2、5、10μmol/L5-Aza-CdR干预胃癌SGC-7901细胞,甲基化特异性PCR(MSP)和逆转录聚合酶链反应(RT-PCR)分别检测药物干预前后EDNRB基因的甲基化状态和EDNRB mRNA的表达,MTT法检测细胞增殖活性,流式细胞术分析细胞周期及细胞凋亡的改变.结果:未经5-Aza-CdR处理的SGC-7901细胞中EDNRB基因启动子区域CpG岛高甲基化,且EDNRB mRNA不表达,经1、2、5、10μmol/L5-Aza-CdR处理4d后,EDNRB基因启动子区域高甲基化状态得到逆转,细胞中EDNRB mRNA表达恢复.4种浓度5-Aza-CdR处理的SGC-7901细胞后,细胞增殖受到抑制,且呈时间和剂量依赖性;并抑制SGC-7901细胞生长周期,其细胞周期阻滞于S期,5、10μmol/L5-Aza-CdR实验组细胞凋亡率显著高于对照组,且差异有统计学意义(7.13%±0.87%,13.34%±1.12% vs 3.69%±...     

曲古菌素A对食管癌EC1细胞增殖和细胞周期的影响及其分子机制

目的:探讨不同浓度曲古菌素A对食管癌细胞系EC1 细胞增殖、细胞周期的影响及其对细胞周期调控基因p21 WAF1/CIP1 表达的影响. 方法:用0.3,0.5,1.0 μmol/L 的TSA 处理EC1 细胞,MTT 检测TSA 作用24 、48 h 对EC1 细胞的抑制作用,流式细胞仪检测0.3,0.5,1.0 μmol/L 的TSA 作用24 h 后EC1 细胞周期的改变,Western blot 法检测p21 WAF1/CIP1 变化. 结果:TSA 在0.5 μmol/L 以上时对EC1 细胞有抑制作用;0.3 μmol/L TSA 处理细胞后细胞周期与对照组相比,无明显变化;0.5 μmol/L TSA 处理EC1 细胞后,G0/G1期细胞较对照组明显增加,S 期细胞较对照组明显减少(74.56% ±1.34% vs 62.12%±0.52%;14.52%±1.81% vs 27.50%±0.66%,均P <0.05);0.5,1.0 μmol/L TSA 处理细胞后p21 WAF1/CIP1 表达明显增加(均P<0.05). 结论:一定浓度的TSA 对人食管癌细胞EC 具有的增殖抑制作用,引起EC1 细胞发生G0/G1 期阻滞,其部分机制与p21 WAF1/CIP1 上调有关.     

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。     

西咪替丁对胃癌细胞SGC-7901增殖及凋亡的影响

目的:观察西咪替丁对人胃癌SGC-7901细胞增殖、细胞周期分布及凋亡的影响,并初步探讨其作用机制.方法:培养人胃癌SGC-7901细胞,以不同浓度的西咪替丁处理后用MTT法检测SGC-7901细胞的增殖情况;流式细胞术检测癌细胞周期和凋亡;Hoechst33258染色后荧光显微镜观察药物作用后癌细胞的形态变化;透射电镜观察用药后细胞超微结构的改变;Western印记法检测Bcl-2和Bax蛋白表达.结果:以不同浓度的西咪替丁分别处理人胃癌SGC-7901细胞24h和48 h,结果发现,在0.5,1,2.5,5,10 mmol/L时对SGC-7901细胞的增殖具有显著的抑制作用,与对照组相比差异显著(24 h:0.705±0.018,0.560±0.038,0.408±0.029,0.276±0.042,0.205±0.031 vs 0.803±0.012,P<0.05;48 h:0.902±0.024,0.671±0.015,0.420±0.030,0.180±0.037,0.0117±0.021 vs 1.079±0.040,P<0.05),并呈时间和剂量依懒性,而在0.25 mmol/L以下浓度对SGC-7901细胞未见明显细胞毒作用;0.5-10 mmol/L西咪替丁作用后,可观察到典型的细胞凋亡形态学改变;流式细胞仪检测可见凋亡峰,G0/G1期细胞明显增多(60.83±2.27,67.21±1.18,75.15±4.01,81.88±3.10,86.99±1.43 vs 50.28±1.97,P<0.05);西咪替丁还可下调SGC-7901细胞中的Bcl-2蛋白表达,上调Bax蛋白表达.结论:西咪替丁可改变细胞周期分布,并能通过下调Bcl-2、上调Bax蛋白表达,诱导SGC-7901细胞凋亡,从而抑制细胞增殖.     

异牛肝菌素对人胃癌细胞生物学特性的影响及机制

目的 探讨异牛肝菌素对人胃癌细胞（SGC-7901）生物学特性的影响及机制。方法 取对数生长期SGC-7901细胞，用2.83、5.66和11.32μmol/L异牛肝菌素分别作用于SGC-7901细胞，设为异牛肝菌2.83μmol/L组、异牛肝菌5.66μmol/L组和异牛肝菌11.32μmol/L组，异牛肝菌0μmol/L组仅加入等容量生理盐水。CCK-8法检测SGC-7901细胞增殖，流式细胞术检测SGC-7901细胞凋亡，Transwell检测SGC-7901细胞侵袭，细胞划痕实验检测细胞迁移，克隆形成实验检测细胞克隆形成能力，采用Real-time PCR法检测E-cadherin、N-cadherin和Vimentin mRNA表达，Western blotting法检测磷脂酰肌醇3激酶(PI3K)、磷酸化磷脂酰肌醇3激酶(p-PI3K)、蛋白激酶B(Akt)、磷酸化蛋白激酶B(p-Akt)蛋白表达，流式细胞术检测活性氧（ROS）水平。结果 与异牛肝菌0μmol/L组相比，异牛肝菌2.83μmol/L组、异牛肝菌5.66μmol/L组、异牛肝菌11.32μmol/L组细胞增殖...     

曲古霉素A对人胃癌细胞的抑制作用及其机制探讨

背景：组蛋白去乙酰基酶抑制剂（HDACi）是一类新型抗肿瘤药物。曲古霉素A（TSA）是目前研究最为广泛的HDACi之一,已发现其对多种肿瘤细胞具有明显抑制作用,但关于TSA对胃癌作用的研究尚少。目的：观察TSA对人胃癌细胞增殖、凋亡、细胞周期以及相关基因表达的影响,探讨其抑制人胃癌细胞的可能作用机制。方法：以不同浓度TSA（0—1μmol／L）处理人胃癌细胞株AGS和HGC-27。CCK-8实验检测细胞增殖抑制情况,流式细胞术检测细胞凋亡和细胞周期,realtimeRT-PCR和蛋白质印迹法检测细胞凋亡、细胞周期相关基因mRNA和蛋白水平的表达。结果：TSA能剂量依赖性地抑制AGS、HGC-27细胞增殖（P=0．000）,对两者的半数致死浓度分别约为0．25μmol／L和0．5μmol／L。TSA能诱导AGS、HGC-27细胞发生G0／G1期和G2／M期阻滞,以G0／G11期阻滞更为明显。TSA对AGS细胞的诱导凋亡作用强于HGC-27细胞（P〈0．05）。TSA尚能上调p21、p53、BaxmRNA和蛋白表达,下调Bel-2、CDK2、cyelinD1mRNA和蛋白表达,作用均呈时间依赖性（P〈0．05）。结论：TSA抑制人胃癌细胞增殖、诱导细胞凋亡的作用可能是通过调节细胞凋亡、细胞周期相关分子、激活多种肿瘤相关信号通路实现的。     

Blocking effects of genistein on cell proliferation and possible mechanism in human gastric carcinoma

AIM: To study the blocking effects of genistein on cell proliferation cycle in human gastric carcinoma cells (SGC-7901) and the possible mechanism. METHODS: MTT assay was applied in the detection of the inhibitory effects of genistein on cell proliferation. Flow cytometry was used to analyze the cell cycle distribution. Immunocytochemical technique and Western blotting were performed to detect the protein expression of cyclin D_1, cyclin B_1 and p21~(waf1/cip1). RESULTS: Genistein significantly inhibited the growth and proliferation of human gastric carcinoma cells (SGC-7901). Seven days after treatment with different concentrations of genistein (2.5, 5.0, 10.0, 20.0 μg/mL), the growth inhibitory rates were 11.2%, 28.8%, 55.3%, 84.7% respectively and cell cycles were arrested at the G(2)/ M phase. Genistein decreased cyclin D_1 protein expression and enhanced cyclin B_1 and p21~(waf1/cip1) protein expression in a concentration-dependent manner. CONCLUSION: The growth and proliferation of SGC-7901 cells can be inhibited by genistein via blocking the cell cycle, with reduced expression of cyclin D_1 and enhanced expression of cyclin B_1 and p21~(waf1/cip1) protein in the concentration range of 0-20 μg/mL.     

γ-氨基丁酸对胰腺癌细胞增殖及转移作用的实验研究

目的 观察γ-氨基丁酸(GABA)对胰腺癌SW1990细胞增殖、细胞周期及基质金属蛋白酶MMP-2、MMP-9表达的影响.方法 应用不同浓度(0～320 μmol/L)GABA干预SW1990细胞,采用MTT法和流式细胞仪检测细胞增殖和细胞周期.RT-PCR检测细胞MMP-2 mRNA和MMP-9 mRNA的表达,Western blot检测MMP-2和MMP-9蛋白表达.结果 GABA促进胰腺癌SW1990细胞的生长,使G0/G1细胞减少,S期和G2/M细胞增多.320μmol/L的GABA干预细胞后的A570值为1.11±0.03,较无GABA干预组的0.56±0.01显著增加(P<0.01);G0/G1细胞为(46.18±1.12)%,较无GABA干预组的(87.29±1.34)%显著减少(P<0.01);MMP-2 mRNA、MMP-9 mRNA及蛋白表达分别为8.6、6.8、10.5、8.4,较0～40μmol/L组显著增加(P<0.05).结论 GABA能促进SW1990细胞增殖和MMPs的表达.     

Induction of apoptosis by arsenic trioxide and hydroxy camptothecin in gastriccancer cells in vitro

AIM To study the effects of arsenic trioxide and HCPT on different degrees of differentiated gastric cancer cells (SGC-7901, MKN-45, MKN-28)with respect to both cytotoxicity and induction of apoptosis in vitro. ~ODS The cytotoxicity of As2O3 and HCPT on gastric cancer cells was determined by MTTassay. Morphologic changes of apoptosis of gastric cancer cells were observed by light microscopy and transmission electron microscopy. Apoptosis and cell cycle changes of gastric cancer cells induced by HCPT and As2O3 were investigated by TUNEL method and flow cytometry. RESULTS As2O3 and HCPT had remarkable cytotoxic effects on different degrees of differentiated gastric cancer cells. The IC50 of As2O3 on well differentiated gastric cancer cell MKN-28, moderately differentiated gastric cancer cell SGC-7901, and poorly differentiated gastric cancer cell MKN-28 were 8. 91 μmol/L, 10. 57 μmol/L, and 11.65 μmol/L, respectively. The IC50 of HCPT on MKN-28, SGC-7901, and MKN-45 were 9. 35 rg/L, 10. 21 rg/L, and 12. 63 mg/L respectively after 48 h treatment. After 12 h of exposure to both drugs, gastric cancer cells exhibited morphologic features of apoptosis, including cell shrinkage, nuclear condensation,and formation of apoptotic bodies. A typical subdiploid peak before G0/G1 phase was observed by flow cytometry. The apoptotic rates of SGC7901, MKN-45, and MKN-28 were 13. 84%, 22.52%, and 9. 68%, respectively after 48 h exposure to 10 μmol/L As2O3. The apoptotic rates of SGC-7901, MKN-45, and MKN-28 were 21.88%, 12.35%, and 30. 26%, respectively after 48 h exposure to 10 mg/L HCPT. The apoptotic indice were 7% - 15% as assessed by TUNEL method. The effect of As2O3 on SGC-7901 showed remarkable cell cycle specificity, which induced cell death in G1 phase, and blocked G2/M phase. HCPT also showed a remarkable cell cycle specificity, by inducing cell death and apoptosis in G1 phase and arrest of proliferation at S phase. CONCLUSION AS2O3 and HCPT exhibit significant cytotoxicity on gastric cancer cells by induction of apoptosis. As2O3 and HCPT might have a promising prospect in the treatment of gastric cancer, which needs to be further studied.     

Gastric cancer cell lines induced by trichostatin A

AIM： To explore the effect of trichostatin A （TSA） on apoptosis and acetylated histone H3 levels in gastric cancer cell lines BGC-823 and SGC-7901. METHODS： The effect of TSA on growth inhibition and apoptosis was examined by MTT, fluorescence microscopy and PI single-labeled flow cytometry. The acetylated histone H3 level was detected by Western blot. RESULTS： TSA induced apoptosis in gastric cancer cell lines BGC-823 and SGC-7901 was in a dose and time-dependent manner. Apoptotic cells varied significantly between TSA treated groups （37.5 ng/mL 72 h for BGC-823 cell line and 75 ng/mL 72 h for SGC-7901 cell line） and control group （0.85 ± 0.14 vs 1.14 ± 0.07, P = 0.02; 0.94 ± 0.07 vs 1.15 ± 0.06, P = 0.02）. Morphologic changes of apoptosis, including nuclear chromatin condensation and fluorescence strength, were observed under fluorescence microscopy. TSA treatment in BGC-823 and SGC-7901 cell lines obviously induced cell apoptosis, which was demonstrated by the increased percentage of sub-G1 phase cells, the reduction of Gl-phase cells and the increase of apoptosis rates in flow cytometric analysis. The result of Western blot showed that the expression of acetylated histone H3 increased in BGC-823 and SGC-7901 TSA treatment groups as compared with the control group.CONCLUSION： TSA can induce cell apoptosis in BGC-823 and SGC-7901 cell lines. The expression of acetylated histone H3 might be correlated with apoptosis.     

Inhibitory effects of c9, t11-conjugated linoleic acid on invasion of human gastric carcinoma cell line SGC-7901

AIM: To investigate the effect of c9, t11-conjugated linoleic acid (c9, t11-CLA) on the invasion of human gastric carcinoma cell line and its possible mechanism of preventing metastasis.METHODS: Using reconstituted basement membrane invasion, chemotaxis, adhesion, PAGE substrate zymography and RT-PCR assays, we analyzed the abilities of invasion,direct migration, adhesion of intracellular matrix, as well as the activity of type IV collagenase and expression of tissue inhibitor of metalloproteinase (TIMP)-1 and TIMP-2 mRNA in SGC-7901 cells which were treated with gradually increased concentrations (25, 50, 100 and 200 μmol/L) of c9, t11-CLA for 24 h.RESULTS: At the concentrations of 200 μmol/L, 100 μmol/L and 50 μmol/L, cg, t11-CLA suppressed the invasion of SGC7901 cells into the reconstituted basement membrane by 53.7%, 40.9% and 29.3%, respectively, in comparison with the negative control. Only in the 200 μmol/L c9,t11CLA group, the chemotaxis of SGC-7901 cells was inhibited by 16.0% in comparision with the negative control. cg, t11CLA also could inhibit the adhesion of SGC-7901 cells to laminin, fibronectin and Matrigel, increase the expression of TIMP-1 and TIMP-2 mRNA, and reduce type IV collagenase activities in the serum-free medium supernatant of SGC7901 cells.CONCLUSION: c9, t11-CLA can inhibit the invasion of SGC7901 cells at multiple procedures in tumor metastasis cascade, which may be associated with the induction of TIMP-1 and TIMP-2 mRNA expression.     

大黄素对人胰腺癌细胞BxPC3增殖及凋亡基因表达的影响

目的 探讨大黄素对人胰腺癌细胞BxPC3的生长抑制作用及其对细胞周期、凋亡率和凋亡相关基因表达的影响.方法 用MTT法测定不同浓度(0、10、20、40、80 μmol/L)大黄素对体外培养的BxPC3细胞增殖的影响,流式细胞仪检测细胞周期及凋亡率,RT-PCR法检测BxPC3细胞bax、bak、bad、bid mRNA表达.结果 0(对照组)、10、20、40、80 μmol/L大黄素处理BxPC细胞后,细胞存活率分别为(97.42±2.45)%、(78.58±3.11)%、(62.39±2.19)%、(51.68±2.92)%、(34.30±4.04)%;G0/G1期细胞比例分别为(51.22±0.64)%、(53.88±0.72)%、(55.39±1.12)%、(58.17±1.48)%、(63.72±1.52)%;S期细胞分别为(42.87±0.67)%、(39.68±0.58)%、(34.60±1.06)%、(31.88±1.48)%、(27.26±1.67)%;细胞凋亡率分别为(19.16±1.69)%、(31.78±2.21)%、(47.03±3.39)%、(55.92±5.39)%、(62.78±3.19)%;bax、bak、bad、bid mRNA表达水平呈剂量依赖性增高(F=55.649,P<0.01;F=19.403,P<0.05;F=29.009,P<0.05;F=39.546,P<0.01).结论 大黄素能抑制体外培养的BxPC3细胞增殖并诱导其凋亡,其机制可能与上调bax、bak、bad、bid mRNA表达有关.     

曲古菌素A协同GX15-070诱导胃癌细胞SGC-7901凋亡机制的研究

目的探讨联合应用曲古菌素(Trichostatin A,TSA)和Bcl-2抑制剂GX15-070诱导人胃癌细胞SGC-7901凋亡作用及其机制。方法以联用或单用TSA、GX15-070作用于SGC-7901细胞,采用MTT法检测细胞存活率;采用Western blot法检测经处理后细胞SGC-7901中cleaved caspase 3和Bcl-2蛋白表达的变化。结果在一定浓度范围内(2.5～10μmol/L)GX15-070以浓度依赖性诱导SGC-7901细胞存活率降低,各浓度组间细胞存活率差异有统计学意义(P<0.01),且随作用时间延长,SGC-7901细胞存活率降低(P<0.05);TSA和GX15-070联用组较单用TSA组、GX15-070组SGC-7901细胞存活率差异有统计学意义(P<0.01);West-ern blot检测显示TSA能上调凋亡蛋白cleaved caspase 3的表达和下调Bcl-2蛋白的表达。结论 TSA具有协同诱导胃癌细胞SGC-7901凋亡的作用,其机制可能是通过上调cleaved caspase 3和下调Bcl-2蛋白的表达有关。     

去甲斑蝥素对多发性骨髓瘤细胞周期和血管内皮细胞生长因子的影响

目的 探讨去甲斑蝥素(NCTD)抗骨髓瘤效应的机制.方法 利用流式细胞术检测不同浓度NCTD作用24h后细胞周期的改变,Western blot检测CDK1、cyclin A和cyclin B1的改变,免疫组化和RT-PCR测定血管内皮细胞生长因子(VEGF)的表达.结果 经NCTD处理24h后,随着NCTD浓度增加,G2/M期细胞明显增加,S期细胞明显减少,呈剂量依赖性;NCTD以剂量依赖的方式抑制cyclin B1、CDK1和cyclin A的表达;NCTD以剂量依赖的方式抑制VEGF mRNA和蛋白的表达.结论 NCTD对U266细胞有抗增殖和促凋亡作用,其作用机制可能与调节细胞周期和抑制VEGF的表达有关.