Apogossypolone抑制乳腺癌MCF-7细胞增殖及诱导细胞凋亡

目的:研究Apogossypolone(ApoG2)对人乳腺癌细胞系MCF-7体外的增殖抑制和诱导凋亡作用.方法:采用MTT法和平板克隆形成实验检测ApoG2作用于MCF-7细胞后,对其体外增殖和细胞克隆形成能力的影响;Hoechst 33258荧光染色法观察ApoG2(20μmol/L)作用48 h后,细胞凋亡的形态学变化;FCM检测ApoG2作用于MCF-7细胞后的细胞凋亡率以及细胞周期的变化.结果:ApoG2药物在浓度为5μmol/L、作用14 d后就能对MCF-7细胞增殖起到明显的抑制作用,且呈剂量和时间依赖性;平板克隆实验表明,经不同浓度(5、10和20 μmol/L)ApoG2作用14 d后,对MCF-7细胞克隆形成能力呈现明显的抑制作用,且同样呈剂量和时间依赖性.Hoechst 33258荧光染色结果显示,ApoG2与MCF-7细胞共培养72 h后,细胞呈现明显的核固缩和碎裂、染色质凝集和凋亡小体形成等细胞凋亡现象.FCM检测结果显示,20 μmol/LApoG2作用72 h后,细胞凋亡率较对照组升高,而且S期和G2/M期细胞比例较对照组升高(P＜0.05).结论:ApoG2能够抑制人乳腺癌细胞系MCF-7的增殖和克隆形成,阻滞细胞周期,诱导细胞凋亡.     

三氧化二砷抑制乳腺癌MCF-7细胞作用机制的研究

目的:探讨三氧化二砷(As2O3)抑制乳腺癌MCF-7细胞的作用机制.方法:噻唑兰(MTT)法检测As2O3对MCF-7细胞存活率的影响;流式细胞技术检测As2O3引起MCF-7细胞凋亡.通过caspas-3试剂盒检测其活性,推测其可能的凋亡信号通路.结果:MTr实验表明As2O3使MCF-7细胞存活率下降并呈现剂量依赖的量效关系;流式细胞测定结果证实As2O3对乳腺癌细胞具有致凋亡作用;As2O3作用后的MCF-7细胞caspase-3的活性显著增高.结论:As2O3诱导MCF-7细胞凋亡,其机制至少部分与激活caspase-3有关.     

紫杉醇诱导MCF-7乳腺癌细胞凋亡的蛋白质组研究

目的 研究紫杉醇诱导MCF-7乳腺癌细胞凋亡的分子机制。方法 以100nmol／L紫杉醇作用MCF-7细胞24h后提取细胞总蛋白,利用蛋白质组技术,对紫杉醇诱导的MCF-7乳腺癌细胞凋亡前后的细胞蛋白进行二维电泳图谱分析,通过质谱鉴定差异蛋白质。结果 通过对凋亡前后的蛋白质组二维电泳图谱分析,找到了17个差异较大的蛋白质,其中6个蛋白质通过质谱得到了鉴定,它们是烯醇化酶、细胞核氯离子通道蛋白、角蛋白8、核糖体蛋白S12、galectin-1和Hint。结论 通过蛋白质组技术,发现了在紫杉醇诱导MCF-7乳腺癌细胞凋亡前后发生变化的6种蛋白质;这些差异蛋白质在紫杉醇诱导细胞凋亡中发挥一定的作用。     

共轭亚油酸单体诱导乳腺癌细胞MCF-7凋亡及其作用机制的研究

目的:研究2种共轭亚油酸(conjugated linoleic acid,CLA)单体--顺9,反11-CLA(cis 9,trans11-CLA, c 9,t11-CLA)和反10,顺12- CLA(trans10,cis12-CLA, t10,c12-CLA) 诱导乳腺癌细胞MCF-7凋亡及其作用机制.方法:采用MTT法检测CLA对MCF-7细胞的生长抑制作用,锥虫蓝染色绘制CLA作用后MCF-7细胞的生长曲线;荧光显微镜观察及FCM检测MCF-7细胞的凋亡和细胞周期的改变;RT-PCR和Western印迹法检测MCF-7细胞PPARγ、Bcl-xL和Bcl-xS mRNA以及PPARγ、Bcl-2、Bax和caspase-3的蛋白表达.结果:2种CLA单体均可抑制MCF-7细胞增殖并诱导细胞凋亡,与对照组相比差异有统计学意义(P<0.05);RT-PCR和Western印迹法检测结果显示,2种CLA单体均可以提高PPARγ、Bcl-xS mRNA和PPARγ、Bax、caspase-3蛋白的表达,降低Bcl-xL mRNA和Bcl-2蛋白的表达,与对照组比较差异有统计学意义(P<0.05);且2种CLA单体对PPARγ与凋亡相关蛋白Bax、Bcl-2和caspase-3的表达影响呈剂量和时间依赖性及同步相关性.结论:c 9,t11-CLA和t10,c12-CLA对乳腺癌MCF-7细胞具有抑制生长和促凋亡的作用,CLA可能作为PPARγ的配体通过激活PPARγ-Bcl-2-caspase-3细胞凋亡信号通路而实现抑制肿瘤细胞生长的作用.     

电化学疗法对乳腺癌MCF-7细胞凋亡及细胞内钙离子浓度的影响

目的探讨电化学疗法(ECT)对乳腺癌MCF-7细胞内钙离子浓度及细胞凋亡、坏死和细胞生长抑制的影响。方法将MCF-7细胞分为对照组及实验组,对照组为0 C(C:库仑),实验组按电量不同分为4组:3 C、5 C、10 C及20 C组。每组重复6孔,用不同电量处理MCF-7细胞后培养6 h和24 h,通过MTT法、GENMED细胞钙离子浓度比色法、流式细胞仪和激光共聚焦分别检测细胞生长抑制率、细胞内Ca2+浓度、观察凋亡和坏死情况。组间均数比较采用方差分析,应用SNK方法进行两两比较,应用5×2析因分析探讨电量与时间对细胞的影响。结果不同电量干预MCF-7细胞后培养6 h及24 h,细胞生长抑制率(6 h:F=508.43,P=0.000;24 h:F=232.76,P=0.000)、坏死率(6 h:F=2282.07,P=0.000;24 h:F=2644.60,P=0.000)、细胞内Ca2+浓度(6 h:F=1416.06,P=0.000;24 h:F=2394.26,P=0.000)随电量增加而增加,电量及培养时间之间具有交互作用(F=288.93,P=0.000;F=2305.39,P=0.000;F=1651.96,P=0.000)。流式细胞仪检测细胞凋亡率结果显示,细胞凋亡率在3、5、10 C组明显增高,而20 C组细胞凋亡率降低,电量及培养时间有交互作用(F=51.20,P=0.000)。结论 ECT可抑制乳腺癌MCF-7细胞株的生长并诱导其凋亡,并引起细胞内Ca2+浓度升高。低剂量ECT主要诱导细胞凋亡,高剂量ECT主要引起细胞坏死。     

miR-15a诱导人乳腺癌细胞MCF-7凋亡的作用机制

目的 探讨miR-15a在诱导乳腺癌细胞凋亡中的作用及机制.方法 采用定量聚合酶链反应检测人乳腺上皮细胞株MCF-10A和乳腺癌细胞株MCF-7中miR-15a的表达水平.采用软件预测miR-15a的靶点,并通过荧光素酶报告基因系统验证.将miR-15a经脂质体法转染MCF-7细胞,采用Western blot法检测Bcl-2蛋白的表达,并采用流式细胞术检测MCF-7细胞的凋亡率.结果 miR-15a在乳腺癌细胞株MCF-7中的表达明显低于乳腺上皮细胞株MCF-10A (0.253∶1,P＜0.0001).miR-15a可显著抑制抗凋亡基因Bcl-2 3′-UTR荧光素酶报告基因的表达(P＜0.05).与未转染组(对照组)相比,miR-15a转染组MCF-7细胞中Bcl-2的表达水平显著下降,凋亡明显增加(P＜0.05).结论 miR-15a 作为一个潜在的抑癌基因,可通过靶向于Bcl-2诱导乳腺癌细胞MCF-7发生凋亡,其可为乳腺癌的临床治疗提供新的靶点和理论依据.     

人参皂甙Rg3诱导乳腺癌细胞系 MCF-7凋亡的实验研究

背景与目的:人参皂甙Rg3[20(R)-GinsenosideRg3]是从红参中提取的微量中药单体。近年研究表明人参皂甙Rg3尚具有抑制肿瘤细胞的增殖、抗肿瘤细胞浸润和转移等作用。肿瘤的发生和发展是一个极其复杂的过程,有多种转移相关的蛋白因子参与,并涉及多种转移途径和分子机制。人参皂甙Rg3抗肿瘤机制的研究为目前中药抗肿瘤研究热点之一。本研究的目的在于探讨Rg3抑制乳腺癌细胞的作用及其诱导凋亡的机制。材料与方法:四甲基偶氮唑蓝(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide,MTT)法检测人乳腺癌细胞MCF-7的细胞增殖活力;荧光染色观察凋亡细胞的形态学变化;流式细胞术分析细胞周期及细胞凋亡;琼脂糖凝胶电泳测定DNA梯状带。结果:Rg3与MCF-7细胞生长抑制率之间有浓度依赖关系,相关系数(r)=0.953,Rg3处理细胞48h的IC50为71.91μg/ml;荧光显微镜下观察到经Rg3作用后,MCF-7细胞出现染色质凝集、核片段化、凋亡小体等凋亡形态学特征;流式细胞术检测表明Rg3能诱导细胞凋亡及调节细胞周期,用150μg/ml的Rg3处理细胞48h后,S期和G2-M期的细胞比率增加,G0-G1的细胞比率下降。细胞凋亡率从对照组的(0.45±0.25)%上升到(34.86±4.65)%。DNA琼脂糖凝胶电泳结果显示,服150μg/ml的Rg3处理细胞24h和48h后,能够使细胞产生明显的梯形电泳图谱(DNAladder)。结论:Rg3可通过诱导MCF-7细胞凋亡而发挥其抑制细胞增殖的作用。     

MSTI基因对乳腺癌细胞MCF-7增殖与凋亡的影响

目的：探讨MST1（mammalian sterile 20-like kinase1）基因对人乳腺癌细胞MCF-7增殖与凋亡的影响。方法：构建含有标签蛋白FLAG的MSTI质粒pCMV-FLAG-MST1；将构建好的pCMV-FLAG-MST1质粒在脂质体lipofectamine2000的介导下转染MCF-7细胞，通过Western印迹法分析MST1在MCF-7中的表达情况；分别在转染后12、24、36和48h通过MTF法观察MST1对细胞增殖的影响；转染后36h加入5-溴-2’脱氧尿嘧啶（bromodeoxy uridine，BrdU），通过其掺入比率显示MST1对细胞增殖的影响；转染后36h加入顺铂，作用14h后通过AnnexinV检测其对细胞凋亡的影响。结果：成功构建pCMV—FLAG-MST1质粒；MTT及BrdU检测显示，转染pCMV—FLAG-MST1质粒后MCF-7细胞增殖明显受到抑制；AnnexinV检测结果提示，高表达MST1后，细胞的凋亡率相对增高。结论：在乳腺癌细胞MCF-7中高表达MST1，不仅可以抑制细胞增殖，还可以促进细胞凋亡。     

新藤黄酸抑制人乳腺癌细胞株MCF-7增殖的实验研究

目的 探讨新藤黄酸对人乳腺癌细胞株MCF-7的增殖抑制情况及其作用机制。方法 0.5～20μg／ml新藤黄酸处理MCF-7细胞72h,四甲基偶氮唑盐（MTT）法检测MCF 7细胞增殖抑制率;流式细胞术Annexin V-FITC/PI双染色检测细胞凋亡率;线粒体膜电位检测试剂盒（JC-1）检测线粒体跨膜电位变化;Western blotting检测Fas、FasL、caspase-3、caspase-8、caspase-9、Bax和Bcl-2蛋白表达水平。结果 0.5～20μg／ml新藤黄酸均能够抑制MCF-7细胞增殖,且增殖抑制作用呈浓度依赖,半数抑制浓度（IC₅₀）为1763 μg／ml。0.5～3.0μg／ml新藤黄酸即可诱导MCF-7细胞凋亡,凋亡作用呈时间和浓度依赖。0.5μg／ml新藤黄酸处理MCF 7细胞48h后早期凋亡率为3.7％,总凋亡率为7.2％,72h早期凋亡率为6.7％,总凋亡率为13.7％;3μg／ml新藤黄酸48h后早期凋亡率为69.5％,总凋亡率为71.7％,72h早期凋亡率为76.9％,总凋亡率为81.5％。0.5、1.0、1.5 μg／ml新藤黄酸导致线粒体跨膜电位下降的细胞比例升高,促凋亡相关蛋白 FasL、caspase-3、caspase-8、caspase-9表达水平呈浓度依赖性上升,Fas和Bax蛋白表达水平变化不大,抗凋亡蛋白Bcl-2表达水平则呈浓度依赖性下降。结论 新藤黄酸通过诱导人乳腺癌细胞株MCF-7凋亡,抑制细胞增殖,其诱导凋亡的分子机制与死亡受体及线粒体凋亡途径密切相关。     

去磷酸化RB蛋白表达对阿霉素诱导MCF-7/S细胞凋亡的影响

目的检测经阿霉素(ADR)处理的人乳腺癌MCF-7/S细胞的凋亡率(AR)及去磷酸化RB蛋白表达的变化,以探讨ADR诱导细胞凋亡的可能机理。方法将体外培养的MCF-7/S细胞分为实验组(以不同浓度ADR处理细胞)及对照组(以等体积的生理盐水处理细胞);应用MTT比色法检测ADR对MCF-7/S细胞的抑制率(IR);应用流式细胞术检测实验组和对照组细胞的AR;采用S-P免疫组化染色法检测ADR作用后去磷酸化RB蛋白表达的变化。结果ADR抑制MCF-7/S细胞增殖,呈剂量依赖性,IC50为0.128mg/L;0.25、2、5μg/mlADR处理的MCF-7/S细胞的AR分别为0.171、0.184、0.259,而对照组MCF-7/S细胞的AR为0.045,两者比较,有非常显著性差异(P<0.01);5μg/mlADR实验组MCF-7/S细胞的去磷酸化RB蛋白的表达量为986.8±207.4,而对照组为131.7±31.9,两者比较,有非常显著性差异(P<0.01);5μg/mlADR实验组MCF-7/S细胞的AR与其去磷酸化RB蛋白的表达量呈正相关(γ=0.998,P=0.037)。结论ADR能抑制MCF-7/S细胞增殖并诱导其凋亡,其机理可能与去磷酸化RB蛋白表达水平上调有关。     

索拉非尼联合表阿霉素对乳腺癌MCF-7细胞的增殖抑制作用

[目的]探讨索拉非尼联合表阿霉素对乳腺癌MCF-7细胞的增殖抑制作用。[方法]绘制MCF-7细胞生长曲线并在第14d检测其体外克隆形成率;MTT法测定72h时索拉非尼及表阿霉素单用与联用对MCF-7细胞的增殖抑制率。[结果]细胞生长曲线显示MCF-7细胞第1-4d生长速度较快,第4d后生长速度减慢,第10d后生长趋于停滞;第14dMCF-7细胞的克隆形成率为37.2%。在72h时间点,索拉非尼及表阿霉素单药对MCF-7均有抑制作用,两药联合则为协同或相加作用。[结论]索拉非尼和表阿霉素对乳腺癌MCF-7细胞增殖有抑制作用,联合用药表现出协同或相加作用。     

Effects of Rapamycin on Cell Apoptosis in MCF-7 Human Breast Cancer Cells

Background: Rapamycin is an effective anti-angiogenic drug. However, the mode of its action remainsunclear. Therefore, in this study, we aimed to elucidate the antitumor mechanism of rapamycin, hypotheticallyvia apoptotic promotion, using MCF-7 breast cancer cells. Materials and Methods: MCF-7 cells were platedat a density of 15105 cells/well in 6-well plates. After 24h, cells were treated with a series of concentrations ofrapamycin while only adding DMEM medium with PEG for the control regiment and grown at 37oC, 5% CO2and 95% air for 72h. Trypan blue was used to determine the cell viability and proliferation. Untreated andrapamycin-treated MCF-7 cells were also examined for morphological changes with an inverted-phase contrastmicroscope. Alteration in cell morphology was ascertained, along with a stage in the cell cycle and proliferation.In addition, cytotoxicity testing was performed using normal mouse breast mammary pads. Results: Our resultsclearly showed that rapamycin exhibited inhibitory activity on MCF-7 cell lines. The IC50 value of rapamycin onthe MCF-7 cells was determined as 0.4μg/ml (p<0.05). Direct observation by inverted microscopy demonstratedthat the MCF-7 cells treated with rapamycin showed characteristic features of apoptosis including cell shrinkage,vascularization and autophagy. Cells underwent early apoptosis up to 24% after 72h. Analysis of the cell cycleshowed an increase in the G0G1 phase cell population and a corresponding decrease in the S and G2M phasepopulations, from 81.5% to 91.3% and 17.3% to 7.9%, respectively. Conclusions: This study demonstrated thatrapamycin may potentially act as an anti-cancer agent via the inhibition of growth with some morphologicalchanges of the MCF-7 cancer cells, arrest cell cycle progression at G0/G1 phase and induction of apoptosis inlate stage of apoptosis. Further studies are needed to further characterize the mode of action of rapamycin asan anti-cancer agent.     

Apogossypolone对乳腺癌MCF-7细胞株放射增敏的体外实验研究

[目的]探讨Apogossypolone(ApoG2)对乳腺癌MCF-7细胞株的放射增敏作用及其作用机制。[方法]①MTT法检测ApoG2单药对MCF-7细胞的抑制率,确立细胞半数抑制浓度(IC50)。②根据MTT结果选取低浓度(相似文献   

Irofulven Induces Apoptosis in Breast Cancer Cells Regardless of Caspase-3 Status*

Caspase-3 deficiency can limit the efficiency of pro-apoptotic anticancer treatments. Irofulven (hydroxymethylacylfulvene, HMAF, MGI 114, NSC 683863) is an antitumor drug, currently in a Phase III and multiple Phase II trials, which can differentiate between tumor and normal cells in apoptosis induction. This study investigated whether apoptosis induced by irofulven requires caspase-3. Irofulven action was compared in breast cancer cells differing in caspase-3 status: deficient MCF-7 cells and proficient MDA-MB-231 cells and in normal human mammary epithelial cells, HMEC. Irofulven induces significant, concentration and time-dependent apoptotic DNA fragmentation in breast cancer cell lines, regardless of caspase-3 status. After 12, 24 and 48h incubation at 1M irofulven ( 3×GI₅₀), fragmented DNA comprised 3.7, 14.1 and 34.6% and 8.4, 12.6 and 20.3% of total DNA in MCF-7 and MDA-MB-231 cells, respectively. Cell viability (trypan blue exclusion) remained largely unaffected during the first 24h but decreased markedly after 48h, indicating secondary necrosis. Net losses in cell numbers were apparent at 48h. Normal HMEC cells were refractory to 1M drug with only 3–9% fragmented DNA after 12–48h, although apoptosis was observed at drug levels >3M. The broad-spectrum caspase inhibitor Z-VAD-fmk inhibited irofulven-induced apoptosis of all cell lines at 20M with nearly complete abrogation of apoptosis at 100M. Irofulven treatment resulted in marginal caspase-3 processing in MDA-MB-231 and HMEC cells. These results indicate that whereas the caspase cascade mediates irofulven- induced apoptosis, caspase-3 is dispensable (supported by NIH CA70091 and CA78706).     

Silibinin Enhances Ultraviolet B-Induced Apoptosis in MCF-7 Human Breast Cancer Cells

Purpose

Chemotherapies for breast cancer generally have strong cellular cytotoxicity and severe side effects. Thus, significant emphasis has been placed on combinations of naturally occurring chemopreventive agents. Silibinin is a major bioactive flavonolignan extracted from milk thistle with chemopreventive activity in various organs including the skin, prostate, and breast. However, the mechanism underlying the inhibitory action of silibinin in breast cancer has not been completely elucidated. Therefore, we investigated the effect of silibinin in MCF-7 human breast cancer cells and determined whether silibinin enhances ultraviolet (UV) B-induced apoptosis.

Methods

The effects of silibinin on MCF-7 cell viability were determined using the MTT assay. The effect of silibinin on PARP cleavage, as the hallmark of apoptotic cell death, and p53 protein expression in MCF-7 cells was analyzed using Western blot. The effect of silibinin on UVB-induced apoptosis in MCF-7 cells was analyzed by flow cytometry.

Results

A dose- and time-dependent reduction in viability was observed in MCF-7 cells treated with silibinin. Silibinin strongly induced apoptotic cell death in MCF-7 cells, and induction of apoptosis was associated with increased p53 expression. Moreover, silibinin enhanced UVB-induced apoptosis in MCF-7 cells.

Conclusion

Silibinin induced a loss of cell viability and apoptotic cell death in MCF-7 cells. Furthermore, the combination of silibinin and UVB resulted in an additive effect on apoptosis in MCF-7 cells. These results suggest that silibinin might be an important supplemental agent for treating patients with breast cancer.     

丹皮酚对乳腺癌细胞的生长抑制作用

[目的]研究丹皮酚（Pae）对人乳腺癌细胞的作用及机制。[方法]采用MTT法检测Pae对乳腺癌Bcap37、MDA-MB．453细胞的增殖抑制作用,流式细胞仪检测Pae对Bcap37和MDA-MB-453细胞凋亡和周期分布的影响,WesternBlot检测相关蛋白表达。[结果]Pae对乳腺癌Bcap37及MDA-MB-453细胞均具有增殖抑制作用,并呈时间和剂量依赖性;流式细胞仪分析细胞凋亡率呈浓度依赖性,细胞周期分析显示Pae阻滞Bcap37及MDA-MB-453细胞在G1期;WestemBlot检测凋亡相关蛋白Caspase7、Caspase3和PARP表达减少,而P-FEN蛋白表达增加。[结论]Pae对乳腺癌细胞系具有增殖抑制作用,其机制可能与促进细胞凋亡及引起细胞周期阻滞。PrEN表达上调有关。     

Momordica cochinchinensis Aril Extract Induced Apoptosis in Human MCF-7 Breast Cancer Cells

Momordica cochinchinensis Spreng (MC) has been used in traditional medicine due to its high carotenoidcontent. The objective of this study was to investigate mechanisms underlying apoptotic effects of MC on humanMCF-7 breast cancer cells. A lycopene-enriched aril extract of MC (AE) showed cytotoxicity and antiestrogenicityto MCF-7 cells. On DAPI staining, AE induced cell shrinkage and chromatin condensation were evident. Withflow cytometric analysis, AE increased the percentage of cells in an early apoptosis stage when compared withthe control group. RT-PCR analysis showed AE to significantly increase the expression of the proapoptotic baxgene without effect on expression of the anti-apoptotic bcl-2 gene. Moreover, AE enhanced caspase 6, 8 and 9activity. Taken together, we conclude that AE of MC fruit has anticancer effects on human MCF-7 breast cancercells by induction of cell apoptosis via both intrinsic and extrinsic pathways of signaling     

4-氨基吡啶与多西紫杉醇抗人乳腺癌细胞MCF-7 作用及相互关系探讨*

目的:通过研究钾离子通道阻断剂4- 氨基吡啶（4-AP ）对肿瘤化疗药物多西紫杉醇（docetaxel ,DOC ）的抗人乳腺癌细胞MCF-7 作用的影响,探讨4-AP 能否增强DOC 的作用。方法:用MTT 比色法分析DOC 、4-AP 以及两药联合应用对人乳腺癌细胞MCF-7 增殖的影响;用流式细胞术PI 单染法及Annexin V-FITC/PI双染法检测上述两种药物对人乳腺癌细胞MCF-7 的细胞周期及早期凋亡的影响。结果:DOC 能明显抑制人乳腺癌细胞株MCF-7的增殖,并呈剂量和时间依赖性。4-AP 对MCF-7 细胞增殖亦具有一定的抑制作用,在用药后24h、48h 及72h 的抑制率分别为11.9%±1.7% 、42.1%±3.2% 、44.2%±1.6% 。且5mmol/L 4-AP 可使DOC 的作用增强,使25μ mol/L DOC 对人乳腺癌细胞株MCF-7 最大杀伤作用时间从72h 提前至24h。5 μ mol/L DOC 能够使MCF-7 G2/M期细胞比率明显增加（53.58%±1.44% 与对照组8.83%±0.44% 相比,P<0.01）,使G0/G1 期细胞减少（11.48%±0.14% 与对照组63.89%±0.98% 相比,P<0.01）,说明DOC 主要在G2/M期阻滞MCF-7 细胞的增殖。5mmol/L 4-AP 作用于MCF-7 使其G0/G1 期细胞比率增加,G2/M期细胞明显减少,甚至消失（0.42%±0.17% 与对照组8.83%±0.44% 相比,P<0.05）。 而两药联用可见4-AP 使MCF-7 G2/M期细胞比率有所减少,而G0/G1 期细胞比率有所增加。DOC 单独作用于人乳腺癌细胞株MCF-7 细胞24h 后,能明显增加晚期凋亡和死亡率（由6.97%±0.75% 增加到20.77%±0.75% ,P<0.05）;而两药联合时,与对照组相比,早期凋亡比例由4.60%±0.91% 增加到12.20%±0.82%（P<0.05）,晚期凋亡和死亡细胞比例由6.97%±0.75% 增加到58.42%±0.31%（P<0.05）,提示4-AP（5mmol/L ）能明显增加DOC 诱导的MCF-7 早期凋亡。结论:DOC 和4-AP 分别在G2/M期和G0/G1 期抑制MCF-7 细胞增殖,4-AP 通过促进DOC 诱导细胞凋亡发挥抑制MCF-7 细胞增殖的作用。      

青蒿琥酯对人乳腺癌MCF-7/TAM细胞的抑制作用

[目的]探讨青蒿琥酯抑制耐三苯氧胺人乳腺癌细胞MCF-7/TAM的增殖及其机制。[方法]采用四甲基偶氮唑蓝（MTT）比色分析法、流式细胞术、免疫细胞化学法技术检测青蒿琥酯作用于MCF-7/TAM细胞后的抑制率、凋亡率、细胞周期及Bcl-2表达变化。[结果]青蒿琥酯对MCF-7/TAM细胞有明显的抑制作用,呈浓度和时间依赖性。作用48h后能诱导细胞凋亡,细胞周期被阻滞于G1、G2期（P〈0.05）。青蒿琥酯处理组Bcl-2表达减弱（P〈0.01）。[结论]青蒿琥酯可抑制MCF-7/TAM细胞的增殖,并诱导其凋亡。