4-氨基吡啶对多西紫杉醇抗人乳腺癌细胞作用影响的实验研究

目的：探讨选择性钾离子通道阻断剂4-氨基吡啶（4-AP）对多西紫杉醇（docetaxel,DOC）抗人乳腺癌细胞MDA-MB-43—5S增殖、凋亡和周期的影响。方法：MTT比色法分析DOC、4-AP单独应用以及两药联合应用对MDA—MB-435S增殖的影响;流式细胞术Annexin V—FITC／PI双染法和PI单染法检测两种药物对MDA—MB-435S凋亡和周期的影响。结果：DOC和4-AP单独应用均能抑制MDA—MB-435S的增殖;5mmol／L的4-AP并用25μmol／L的DOC对MDA—MB-435S达最大抑制率的时间明显缩短,DOC和4-AP对MDA—MB-435S的增殖抑制有相加或协同作用,并呈剂量-时间依赖性。2和5μmol／L的DOC单独作用24h,MDA—MB-435S产生凋亡并不明显,当与5mmol／L的4-AP联合应用后,细胞早期凋亡和死亡明显增加。单用DOC可使MDA—MB-435S阻断在G2／M期,单用4-AP可使MDA—MB-435S阻断在G0／G1期,两药联合应用可使MDA—MB-435S阻断在G2／M期。结论：DOC和4-AP分别在G2／M期和G0／G1期抑制MDA—MB-435S的增殖,4-AP通过促进DOC诱导细胞凋亡从而抑制MDA—MB-435S的增殖。     

多西紫杉醇诱导人乳腺癌MCF-7细胞凋亡及相关基因表达的影响

目的探讨多西紫杉醇(docetaxcel)诱导体外培养人乳腺癌MCF-7细胞凋亡的作用及凋亡的分子机制。方法通过MTT比色法分析多西紫杉醇对人乳腺癌MCF-7细胞增殖的影响;应用光镜、电镜观察细胞形态学的改变;Annexin-V/PI双染流式细胞术检测肿瘤细胞周期动力学和凋亡诱导率的影响;免疫组化方法检测凋亡相关基因bax、bc1-2的表达变化。结果多西紫杉醇可明显抑制人乳腺癌MCF-7细胞的增殖,并可导致其形态学的改变;随着加药时间的增长,G2/M期细胞增多,G2/M期细胞和S期细胞的比值也随剂量呈递增关系;加药(IC50)48h后早期凋亡细胞明显增多,同时可上调bax和下调bc1-2的蛋白表达量。结论多西紫杉醇可明显抑制MCF-7肿瘤细胞的生长,诱导细胞凋亡。其分子机制可能与激活bax和抑制bc1-2等凋亡调控基因有关。     

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。     

CXCR4单克隆抗体对人乳腺癌细胞MCF-7凋亡的影响

目的:探讨CXCR4单克隆抗体对人乳腺癌细胞MCF-7凋亡的影响。方法:以CXCR4单克隆抗体作用于MCF-7细胞,通过DNA梯状电泳、Hochest33258/PI荧光染色进行凋亡定性分析,以Annexin V/PI双染法定量检测MCF-7细胞的凋亡。结果:与对照组相比,CXCR4单克隆抗体作用后MCF-7细胞出现凋亡,凋亡率明显升高。结论:CXCR4单克隆抗体明显促进MCF-7细胞的凋亡,提示CXCR4/SDF-1生物学轴对乳腺癌细胞MCF-7的凋亡也有重要影响。     

GSDME通过调控细胞焦亡影响乳腺癌MCF-7细胞对紫杉醇的敏感性

[摘要] 目的：探讨GSDME是否通过调控细胞焦亡影响乳腺癌MCF-7 细胞对化疗药物紫杉醇（paclitaxel,PTX）的敏感性。方法：利用RNA干扰技术敲降GSDME在MCF-7 细胞中的表达,采用CCK-8 法、流式细胞术、乳酸脱氢酶（lactate dehydrogenase,LDH）释放实验及Wb技术分别检测GSDME低表达前后,PTX对细胞增殖、焦亡、LDH释放、GSDME-N端蛋白及cleaved-caspase-3 蛋白表达水平的变化情况。结果：与对照组比较,PTX处理组细胞的焦亡率、LDH释放量、GSDME-N端蛋白及cleaved-caspase-3 蛋白的表达水平均显著升高（均P<0.01）;与si-NC组比较,敲低GSDME可使si-GSDME组细胞对PTX的敏感性降低,其细胞焦亡率、LDH释放量及GSDME-N端蛋白表达水平均显著下降（均P<0.01）。结论：敲减MCF-7 细胞中GSDME的表达量可显著抑制细胞焦亡并降低细胞对PTX的敏感性。     

别直参抑制人乳腺癌细胞MCF-7体外增殖

[目的]评价别直参对MCF-7细胞体外增殖的影响,并检测其对凋亡相关蛋白bax/bcl-2表达的影响.[方法]采用MTT比色法检测对MCF-7细胞增殖的作用;流式细胞术检测对MCF-7细胞凋亡的影响;免疫组化法检测bax/bcl-2的表达.[结果]别直参高剂量组作用MCF-7细胞24h后,MTT检测增殖率为89.83％,提示有抑制MCF-7细胞体外增殖的作用(P＜0.05);流式细胞术检测高剂量组细胞凋亡率明显升高(P＜0.05);免疫组化法检测高剂量组能上调MCF-7细胞bax的表达,并下调bcl-2的表达.[结论]别直参高剂量组具有一定的诱导MCF-7细胞凋亡效应作用,其机制可能通过上调bax的表达和下调bcl-2的表达.     

β-胡萝卜素对人体乳腺癌MCF-7细胞的细胞毒性研究

 目的　研究 β 胡萝卜素对人体乳腺癌MCF 7细胞毒杀作用。 方法　应用MTT比色法 ,在试管内研究 β CA对MMTOD值的影响 ,检测 β CA对MCF 7人乳腺细胞的毒杀作用。 结果　不同浓度的 β CA对MCF 7癌细胞均有杀伤作用。特别是 0 .5、0 .1、0 .0 5mg/ml组 ,其对癌细胞的杀伤率分别达到 99%、88.19%和 5 6 .35 % ,有极显著的统计学差异 (P <0 .0 1)。结论　β CA在试管内对MCF 7乳腺癌细胞有直接的毒杀作用 ,作用机理可能与其直接调控癌基因和抗癌基因的表达有关 ,最终可导致癌细胞的死亡。     

miR-129-5p通过HMGB1 调控乳腺癌MCF-7 细胞对紫杉醇的敏感性

目的：探讨miR-129-5p 通过调控高迁移率族蛋白B1 基因（high mobility group box 1,HMGB1）影响乳腺癌MCF-7 细胞对紫杉醇（paclitaxel,PTX）的敏感性。方法：采用脂质体转染技术将miR-129-5p mimics、HMGB1 小干扰RNA（si-HMGB1）分别转染入MCF-7 细胞,用PTX刺激培养细胞后,用实时荧光定量PCR检测转染后MCF-7 细胞miR-129-5p 和HMGB1 mRNA的表达,Western blotting 检测转染后MCF-7 细胞HMGB1 蛋白的表达,CCK-8 增殖实验检测转染后PTX对MCF-7 细胞增殖的影响,流式细胞术检测转染后对PTX诱导MCF-7 细胞凋亡的影响。结果：转染miR-129-5p mimics 后,MCF-7 细胞中miR-129-5p 的表达水平明显高于阴性对照组细胞（P<0.01）;过表达miR-129-5p 后可明显增强PTX抑制MCF-7 细胞的增殖和诱导细胞凋亡的能力（均P<0.05）,并显著抑制HMGB1 mRNA和蛋白的表达（均P<0.05）。转染si-HMGB1 后,显著降低MCF-7 细胞HMGB1 mRNA 和蛋白的表达（均P<0.05）;干扰HMGB1 表达进一步促进PTX抑制MCF-7 细胞的增殖并诱导细胞凋亡（均P<0.05）。结论：miR-129-5p 通过下调HMGB1 的表达增强乳腺癌MCF-7 细胞对PTX的敏感性。     

Apatinib联合5-Fu协同抑制乳腺癌MCF-7细胞的体外研究

目的 探讨阿帕替尼(Apatinib)联合5-氟尿嘧啶(5-Fu)对乳腺癌MCF-7细胞的抑制作用.方法 采用人乳腺癌细胞株MCF-7,首先采用MTr法及应用流式细胞仪测定不同浓度apatinib作用后对其细胞增殖和周期的影响,其次将MCF-7细胞分为4组,即对照组、Apatinib单药组、5-Fu单药组、Apanitib+ 5-Fu联合组.对各组细胞给予相应药物处理,48 h后分别应用流式细胞仪检测各组药物对MCF-7细胞株凋亡的作用.结果 Apatinib单药对MCF-7细胞有增殖抑制作用,且存在时间剂量依赖关系,而对其细胞周期影响不大.与对照组相比,Apatinib联合5-Fu作用后有协同诱导凋亡作用,经流式细胞仪检测,Apatinib组诱导的细胞凋亡率为12.05％,5-Fu组为25.76％.与单药组比,Apatinib+5-Fu联合组凋亡率升高更为明显,达34.90％ (P＜ 0.05).结论 Apatinib和5-Fu的联合应用在体外协同抑制乳腺癌MCF-7细胞并诱导凋亡,使抗肿瘤活性显著增强.     

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.     

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 Metformin on Cell Kinetic Parameters of MCF-7 Breast Cancer Cells in Vitro

In this study, the antiproliferative effects of the metformin was evaluated on MCF-7 Cells (human breastadenocarcinoma cell line). For this purpose cell kinetic parameters including cell proliferation assay, mitoticindex and labelling index analysis were used. 30 μM, 65 μM and 130 μM Metformin doses were applied to cellsfor 24, 48 and 72 hours. The results showed that there was a significant decrease in cell proliferation, mitoticindex and labelling index for all experimental groups (p<0.05) for all applications.     

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.     

Synergistic Effects of Exemestane and Aspirin on MCF-7 Human Breast Cancer Cells

Objective: The purpose of this study is to investigate the combined effects of exemestane and aspirin on MCF-7 human breast cancer cells. Methods: Antiproliferative effects of exemestane and aspirin, alone and in combination, on growth of MCF-7 human breast cancer cells were assessed using the MTT assay. Synergistic interaction between the two drugs was evaluated in vitro using the combination index (CI) method. The cell cycle distribution was analyzed by flow cytometry and Western blotting was used to investigate the expression of cyclooxygenase-1, cyclooxygenase-2 and Bcl-2. Results: MTT assays indicated that combination treatment obviously decreased the viability of MCF-7 human breast cancer cells compared to individual drug treatment (CI<1). In addition, the combination of exemestane and aspirin exhibited a synergistic inhibition of cell proliferation, significantly arrested the cell cycle in the G0/G1 phase and produced a stronger inhibitory effect on COX-1 and Bcl-2 expression than control or individual drug treatment. Conclusion: These results indicate that the combination of exemestane and aspirin might become a useful method to the treatment of hormonedependent breast cancer. The combination of the two inhibitors significantly increased the response as compared to single agent treatment, suggesting that combination treatment could become a highly effective approach for breast cancer.     

Anticancer Activity of Petroselinum sativum Seed Extracts on MCF-7 Human Breast Cancer Cells

Pharmacological and preventive properties of Petroselinum sativum seed extracts are well known, but theanticancer activity of alcoholic extracts and oil of Petroselinum sativum seeds on human breast cancer cellshave not been explored so far. Therefore, the present study was designed to investigate the cytotoxic activitiesof these extracts against MCF-7 cells. Cells were exposed to 10 to 1000 μg/ml of alcoholic seed extract (PSA)and seed oil (PSO) of Petroselinum sativum for 24 h. Post-treatment, percent cell viability was studied by 3-(4,5-dimethylthiazol-2yl)-2, 5-biphenyl tetrazolium bromide (MTT) and neutral red uptake (NRU) assays, andcellular morphology by phase contrast inverted microscopy. The results showed that PSA and PSO significantlyreduced cell viability, and altered the cellular morphology of MCF-7 cells in a concentration dependent manner.Concentrations of 50 μg/ml and above of PSA and 100 μg/ml and above of PSO were found to be cytotoxic inMCF-7 cells. Cell viability at 50, 100, 250, 500 and 1000 μg/ml of PSA was recorded as 81%, 57%, 33%, 8%and 5%, respectively, whereas at 100, 250, 500, and 1000 μg/ml of PSO values were 90%, 78%, 62%, and 8%,respectively by MTT assay. MCF-7 cells exposed to 250, 500 and 1000 μg/ml of PSA and PSO lost their typicalmorphology and appeared smaller in size. The data revealed that the treatment with PSA and PSO of Petroselinumsativum induced cell death in MCF-7 cells.     

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.     

舒肝凉血方与三苯氧胺合用对人乳腺癌细胞MCF-7生长及ER表达影响

[目的]了解舒肝凉血方与三苯氧胺合用对体外培养的雌激素受体阳性的人乳腺癌细胞MCF-7的生长及雌激素受体表达的影响.[方法]人乳腺癌细胞MCF-7分别加入终浓度20%的含药血清培养液,孵育24、48、72h,MTT法检测各组含药血清对细胞的生长抑制效应.MCF-7细胞加入20%的含药血清培养液,共同孵育48h,提取细胞蛋白质及总RNA,用Western blot法检测各组细胞中雌激素受体α表达,RT-PCR法检测各组细胞ERα mRNA的表达水平.[结果]MTT结果显示,三苯氧胺、中药、三苯氧胺 中药均可抑制MCF-7细胞的体外生长,且有时间依赖性,三苯氧胺加中药组抑制作用最强.采用RT-PCR检测到三苯氧胺组、中药组、三苯氧胺 中药组的ERαmRNA表达略低于对照组,统计学分析差异无显著性.Westem blot结果显示中药组ERα蛋白表达下调,三苯氧胺组及三苯氧胺 中药组的ERα蛋白表达上调.[结论]中药舒肝凉血方与三苯氧胺合用有协同效应,抑制乳腺癌MCF-7细胞的体外生长,并使ERα蛋白的表达上调.     

白藜芦醇抑制MCF-7乳腺癌细胞增殖的机制研究

研究白藜芦醇对MCF-7乳腺癌细胞抑制效应及其作用机制。方法：以人MCF-7乳腺癌细胞株为研究对象,利用MTT方法研究白藜芦醇抑制MCF-7乳腺癌细胞的生物学效应;观察在ERK1/2抑制剂PD98059预处理情况下,白藜芦醇抑制MCF-7乳腺癌细胞增殖效应的改变;利用免疫印迹方法观察白藜芦醇对MCF-7乳腺癌细胞中ERK1/2与AKT信号分子的蛋白表达。结果：白藜芦醇能够明显降低MCF-7乳腺癌细胞增殖能力,该作用呈一定的浓度依赖性关系。在ERK1/2抑制剂PD98059预处理情况下,白藜芦醇对MCF-7乳腺癌细胞增殖抑制效应能明显抑制,PD98059可明显减轻该效应。同时,白藜芦醇明显增加p-ERK1/2蛋白表达,降低p-AKT表达水平,但对ERK1/2与AKT蛋白表达无改变。结论：白藜芦醇能够有效抑制MCF-7乳腺癌细胞增殖,该效应与白藜芦醇对ERK1/2及AKT信号途径的调节有关。     

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