YC-1 exerts inhibitory effects on MDA-MB-468 breast cancer cells by targeting EGFR in vitro and in vivo under normoxic condition

3-(5'-hydroxymethyl-2'-furyl)-1-benzyl indazole(YC-1),the hypoxia-inducible factor-1 alpha(HIF-1α) inhibitor,suppresses tumor proliferation and metastasis by down-regulating HIF-1α expression under hypoxic conditions.Our previous studies demonstrated that YC-1 inhibited breast cancer cell proliferation under normoxic conditions.In the current study,we investigated the targets of YC-1 and mechanism of its action in MDA-MB-468 breast cancer cells.In the in vitro experiments,we found that YC-1 significantly inhibited MDA-MB-468 cell proliferation in normoxia and hypoxia.Under normoxic conditions,YC-1 induced apoptosis of MDA-MB-468 cells and blocked cell cycle in the G1 phase,and these effects were possibly related to caspase 8,p21,and p27 expression.RT-PCR and Western blotting results showed that YC-1 primarily inhibited HIF-1α at the mRNA and protein levels under hypoxic conditions,but suppressed the expression of epidermal growth factor receptor(EGFR) at the mRNA and protein levels under normoxic conditions.In vivo,YC-1 prolonged survival,increased survival rate,decreased tumor size and metastasis rate,and inhibited tissue EGFR and HIF-1α expression.However,YC-1 exerted no obvious effect on body weight.These results indicate that YC-1 inhibits the proliferation of MDA-MB-468 cells by acting on multiple targets with minimal side effects.Thus,YC-1 is a promising target drug for breast cancer.

Effect of amlodipine on apoptosis of human breast carcinoma MDA-MB-231 cells

Objective： To elucidate the effects of amlodipine on the proliferation and apoptosis of human breast carcinoma MDA-MB-231 cells. Methods： Light microscopy was used to determine the effects of amlodipine on cell morphology; Flow cytometry was used to quantitate cells undergoing apoptosis; the expression of a cell cycle-related protein, proliferating cell nuclear antigen （PCNA） and an antiapoptosis protein, Bcl-2 were assessed by immunocytochemistry. Results： Amlodipine concentration of 8.25umol/L （1/2 of ICs0） affected the morphology, decreased the expression of PCNA and Bcl-2 and induced apoptosis of human breast carcinoma MDA-MB-231 cells. Conclusion： The effect of amlodipine on the antiproliferation of human breast carcinoma MDA-MB-231 cells is related to inducement of apoptosis, and the decrease of the expression of Bcl-2 and PCNA may be the possible mechanism for proliferation inhibitory and inducement of apoptosis.

miR-28-3p通过抑制BIN1表达促进三阴性乳腺癌MDA-MB-468细胞的恶性生物学行为

目的:探讨miR-28-3p在三阴性乳腺癌(triple negative breast cancer,TNBC)组织和细胞系中的表达及其对MDA-MB-468细胞恶性生物学行为的影响。方法:收集2013年1月至2014年1月河北医科大学第四医院乳腺中心手术切除的、经病理证实的83例女性TNBC患者的癌组织和癌旁组织标本,以及TNBC细胞系MDA-MB-468、HCC-1937、MDA-MB-231、MDA-MB-436、MDA-MB-453和人正常乳腺上皮细胞MCF10A,用qPCR检测组织和细胞系中miR-28-3p的表达水平并分析其表达与患者临床病理特征的相关性。用miR-28-3p抑制剂转染MDA-MB-468细胞后,用CCK-8、流式细胞术、细胞划痕和Transwell实验分别检测miR-28-3p抑制剂对MDA-MB-468细胞增殖、凋亡、侵袭和迁移能力的影响,用Western blotting检测MDA-MB-468细胞中桥接整合因子1(bridging integrator-1,BIN1)蛋白的表达水平。通过生物信息学工具预测miR-28-3p的靶基因BIN1,用双荧光素酶报告基因实验验证miR-28-3p对BIN1的调控作用。结果:TNBC组织及细胞系中miR-28-3p表达水平显著高于癌旁组织及MCF10A细胞(均P<0.01);83例TNBC组织中共有56例(67.47%)高表达miR-28-3p,其高表达与患者的Ki-67表达水平、肿瘤大小和TNM分期密切相关(均P<0.05或P<0.01)。与miR-NC组比较,miR-28-3p抑制剂组MDA-MB-468细胞增殖、侵袭和迁移能力降低,凋亡率升高(均P<0.05或P<0.01)。双荧光素酶报告基因和实验证实BIN1是miR-28-3p的靶基因,miR-28-3p抑制剂可上调MDA-MB-468细胞中BIN1蛋白的表达(P<0.05)。结论:miR-28-3p在TNBC组织及细胞中呈高表达状态,mi R-28-3p抑制剂上调BIN1表达进而抑制MDA-MB-468细胞的增殖、迁移和侵袭能力,并促进其凋亡。

益气扶正复方联合依维莫司对三阴性乳腺癌MDA-MB-468细胞株裸鼠移植瘤的影响

目的研究益气扶正复方联合依维莫司对三阴性乳腺癌MDA-MB-468细胞株裸鼠移植瘤的抑制作用及其作用机制。方法体外培养三阴性乳腺癌MDA-MB-468细胞株,将细胞悬液接种于雌性BALB/C裸鼠第二乳腺乳垫处,建立皮下移植瘤模型。将造模成功的裸鼠随机分为对照组、益气扶正复方(中药复方)组(40mg/kg)、依维莫司组(2mg/kg)和联合组,每组6只。各组灌胃给予相应药物干预,连续30d。比较各组移植瘤体积和质量的变化,计算各组肿瘤抑制率。采用Real-time PCR检测各组mTor、Akt、P70s6k、4Ebp-1 mRNA的表达水平,Western blot检测各组Akt、p-Akt、m-TOR、p-mTOR、PTEN及mTOR下游底物p-4EBP-1、p-P70S6K的蛋白表达水平。结果与中药复方组相比,联合组移植瘤体积和质量显著减小(P<0.05,P<0.01),肿瘤抑制率明显升高,且联合组mTor和P70s6k mRNA表达及p-mTOR和P70S6K蛋白表达水平明显低于中药复方组,而联合组PTEN蛋白表达高于中药复方组(P<0.05)。结论益气扶正复方与依莫维司联用能抑制MDA-MB-468荷瘤裸鼠的肿瘤组织生长,与益气扶正复方单用相比效应更为显著,其作用机制可能与抑制p-mTOR、p-Akt、p-P70S6K活性,提高p-4EBP-1、PTEN表达有关。

三氧化二砷抑制人乳腺癌MDA-MB-468细胞生长及其机制的研究

背景与目的:探讨三氧化二砷(As2O3)对人乳腺癌MDA-MB-468细胞的生长抑制作用及其对syk表达的影响。材料与方法:采用四甲基偶氮唑蓝(MTT)法检测不同浓度As2O3作用MDA-MB-468细胞不同时间后,对细胞增殖的抑制作用;显微镜观察细胞的形态变化;As2O3作用细胞后用流式细胞术检测细胞周期及Syk蛋白表达变化;RT-PCR检测syk mRNA的表达变化。结果:As2O3可显著抑制MDA-MB-468细胞增殖,且抑制效应呈剂量和时间依赖性(P<0.05);As2O3可使细胞周期阻滞在S+G2/M期;候选抑癌基因syk在乳腺癌MDA-MB-468细胞中表达,经As2O3作用后,MDA-MB-468细胞sykmRNA和Syk蛋白表达水平明显升高(P<0.05)。结论:As2O3可能通过上调候选抑癌基因syk的表达,抑制MDA-MB-468细胞增殖,从而发挥抗肿瘤作用。

黄芪注射液对basal-like型乳腺癌细胞MDA-MB-468增殖的影响

目的:观察黄芪对basal-like乳腺癌细胞MDA-MB-468和小鼠骨髓基质干细胞(murine bone marrow stromal stem cells,mMSCs)增殖的影响及其异同。方法:用不同浓度的黄芪注射液(Astragalus injection,AI)分别干预MDA-MB-468和mMSCs,不加AI培养2d的MDA-MB-468细胞作为空白对照。用相差倒置显微镜观察细胞形态,透射电子显微镜观察细胞超微结构。运用细胞计数试剂盒(cell counting kit-8,CCK-8)检测AI对MDA-MB-468的细胞毒性作用。流式细胞术检测AI对细胞周期和细胞凋亡的影响。酶比色法监测MDA-MB-468细胞培养上清乳酸脱氢酶(lactate dehydrogenase,LDH)含量。免疫细胞化学法检测AI对MDA-MB-468表皮生长因子受体(epider- mal growth factor receptor,EGFR)和p53蛋白表达的影响。结果:1g/ml AI对MDA-MB-468的增殖有明显的抑制作用,且具有时效关系。1g/ml AI对mMSCs的增殖有明显的抑制作用,但其抑制作用不及顺铂,而0.1g/ml AI对mMSCs的增殖有明显的促进作用。不同浓度的AI能诱导MDA-MB-468细胞凋亡。不同浓度AI组和顺铂组MDA-MB-468细胞培养上清LDH水平,与空白对照组相比,差异均无统计学意义。AI能显著下调EGFR和p53蛋白的表达。结论:AI对MDA-MB-468和mMSCs增殖的影响与药物浓度有关,其抑制MDA-MB-468增殖和诱导凋亡的机制可能通过下调EGFR和p53蛋白的表达而实现。

莱菔素通过阻断STAT3信号通路杀伤三阴性乳腺癌细胞MDA-MB-468和MDA-MA-231

目的:探讨染色体区域维持因子1(CRM1)抑制剂莱菔素(LFS-01)通过抑制信号转导及转录激活因子3(STAT3)信号通路杀伤三阴性乳腺癌(TNBC)细胞的作用及其机制。方法:通过分子动力学模拟技术,验证LFS-01是否可与CRM1分子结构上的核输出信号(NES)口袋结合。通过CCK-8法检测LFS-01对4种不同的乳腺癌细胞杀伤活力。用不同浓度的LFS-01处理TNBC细胞MDA-MB-468和MDA-MB-231,免疫荧光法检测CRM1货物蛋白STAT3以及带有NES序列的蛋白在细胞内定位的变化;WB检测LFS-01对STAT-3信号通路以及其下游蛋白表达的影响;WB、细胞免疫荧光和透射电镜法检测自噬的发生;通过流式细胞术检测药物对细胞周期和凋亡的影响。结果:分子动力学模拟结果表明,LFS-01能够与CRM1的NES口袋结合,显示其在结构上影响后者蛋白转运功能的可能性。LFS-01能特异性杀伤TNBC细胞MDA-MB-468和MDA-MB-231。10μmol/L LFS-01处理后TNBC细胞中STAT3和带有NES标签的蛋白均被阻滞于细胞核中,而在对照组中这些蛋白均匀分布在细胞质中。随着LFS-01剂量的提高和处理时间的延长,MDA-MB-468和MDA-MB-231细胞中磷酸化STAT3蛋白、Bcl-xL和Cylin D1表达均降低,细胞内自噬标志蛋白LC3B表达上升;同时出现高密度、多层的团状自噬小体;细胞周期阻滞于S期,并且凋亡率显著升高(P<0.05或P<0.01)。结论:LFS-01可阻断CRM1运载蛋白出核、进而抑制STAT3信号通路的激活,从而促进TNBC细胞MDA-MB-468和MDA-MB-231发生自噬、细胞周期阻滞和凋亡。

PI3K/AKT信号通路在三阴性乳腺癌细胞MDA-MB-468中的作用及三氧化二砷对其的干预作用

目的探讨三氧化二砷通过磷脂酰肌醇-3-激酶(PI3K)/蛋白激酶B(AKT)信号通路对三阴性乳腺癌细胞MDAMB-468凋亡的影响。方法实验分为空白对照组,三氧化二砷组(2、4、8μmol/L),LY294002组(25μmol/L),三氧化二砷(4μmol/L)联合LY294002(25μmol/L)组(联合组);MTT法检测各组细胞活力;流式细胞术检测各组细胞周期;Western blot分析各组PI3K/AKT通路的激活状况及其下游靶分子细胞周期蛋白A1(Cyclin A1),Cyclin D1,Bax,Bcl-2的表达。结果2、4、8μmol/L三氧化二砷,LY294002都可显著抑制细胞活力(P<0.05),并且在48h抑制程度最高;与对照组比较,4μmol/L三氧化二砷及LY294002都可使细胞周期阻滞在G1期(P<0.05),并降低AKT磷酸化水平(P<0.05),进而下调Cyclin A1,Cyclin D1,Bcl-2的表达(P<0.05),上调Bax的表达(P<0.05);三氧化二砷联合LY294002处理MDA-MB-468细胞较药物单独作用效果增强(P<0.05)。结论三氧化二砷及LY294002可通过阻断PI3K/AKT信号通路来诱导三阴性乳腺癌细胞MDA-MB-468凋亡,二者具有协同作用。

shRNA靶向沉默CNTN1表达抑制乳腺癌细胞株MDA-MB-468增殖及克隆形成能力

目的:探讨短发夹RNA(shRNA)靶向沉默CNTN1基因表达对乳腺癌MDA-MB-468细胞增殖及克隆形成能力的影响。方法:采用RT-PCR和Western blot法检测乳腺癌细胞株MCF7-ADR、MDA-MB-468、MCF7以及Hs578T中的CNTN1 mRNA和蛋白表达水平。采用Lipofectamine~(TM)2000向MDA-MB-468细胞株转染成功构建的靶向沉默CNTN1表达的shRNA载体片段,并采用RT-PCR法和Western blot法进行鉴定。分别通过MTT法、流式细胞仪技术和平板克隆实验检测各组细胞增殖及克隆形成能力的改变。结果:CNTN1 mRNA和蛋白表达水平在MDA-MB-468中最高。沉默组MDA-MB-468细胞发生G1期阻滞,增殖能力明显降低(P <0.05),克隆形成能力明显减弱(P <0.05)。结论:CNTN1基因在乳腺癌MDA-MB-468细胞中高表达,沉默其表达可抑制乳腺癌MDA-MB-468细胞增殖和克隆形成能力。

Piperine suppresses growth and migration of human breast cancer cells through attenuation of Rac1 expression

Objective:To investigate the effect of piperine on human breast cancer cells.Methods:The effect of piperine on proliferation and migration of human breast cancer cells,MCF-7 and MDA-MB-231,was investigated using colony formation assays,wound healing assays,Matrigel migration assays,flow cytometry,RT-qPCR,and Western blotting assays.Results:Piperine inhibited the growth of MCF-7 and MDA-MB-231 cells and suppressed colony formation.Cell reduction at the G_(0)/G_(1) phase and cell arrest at the G_(2)/M phase were observed in breast cancer cells.However,the significant effect was only demonstrated in MDA-MB-231 cells.Moreover,cancer cell migration was suppressed by piperine at low concentration.RT-qPCR and Western blotting assays showed that piperine downregulated Rac1 gene and protein expression.Conclusions:Piperine could inhibit growth and migration of breast cancer cells by reducing Rac1 gene and protein expression.

人BMI-1基因真核表达载体构建及其在人乳腺癌细胞系MDA-MB-468细胞中的表达

目的：构建人Bmi-1基因的真核表达载体pcDNA3．1（＋）-Bmi-1，转染人乳腺癌细胞株MDA-MB-468细胞中并检测其表达。方法：RT-PCR检测Bmi．1mRNA在乳腺癌细胞系MCF-7及MDA-MB-468细胞中的表达水平；从MCF-7细胞中提取总RNA，逆转录为cDNA，以cDNA为模板，扩增Bmi-1基因序列，将含有Bmi-1全长编码序列的PCR产物经TA克隆后经PCR、酶切验证，亚克隆入真核表达载体pcDNA3．1（＋）中，构建重组质粒pcDNA3．1（＋）-Bmi-1，转化至大肠杆菌后，酶切、测序鉴定；将重组质粒转染到MDA-MB-468中，48h后RT-PCR检测转染前后Bmi-1mRNA及hTERTmRNA的表达变化。结果：Bmi-1mRNA在MCF-7细胞中表达较高，而在MDA-MB-468细胞中仅适量表达。成功从MCF-7细胞中克隆获得Bmi-1基因并构建真核表达载体。转染后在MDA-MB-468中检测到Bmi-1mRNA表达上调，其过表达上调hTERTmRNA的表达。结论：成功克隆和建立人Bmi-1基因真核表达载体；pcDNA3．1（＋）-Bmi-1能在MDA-MB-468中表达；为进一步研究Bmi-1基因在细胞中的功能奠定了基础。

Methanolic extract of Abrus precatorius promotes breast cancer MDA-MB-231 cell death by inducing cell cycle arrest at G0/G1 and upregulating Bax

Objective:To determine the anti-proliferative activity of Abrus precatorius(A.precatorius)leaf extracts and their effect on cell death.Methods:A.precatorius leaves were extracted successively with hexane,ethyl acetate and methanol by Soxhlet extraction.Aqueous extract was prepared by decoction at 50 ℃.Extracts of A.precatorius leaves were used to treat selected cancer and normal cell lines for72 h.Furthermore,3-(4,5-dimethyl thiazol-2-yl)2,5-diphenyl tetrazolium bromide assay was performed to determine cell viability.Analysis of cell cycle arrest,apoptosis assay and apoptosis protein expressions were determined by flow cytometry.Results:Methanolic extract of A.precatorius leaves showed the lowest IC50 on MDA-MB-231 cells at(26.40±5.40)μg/mL.Flow cytometry analysis revealed that cell arrest occurred at G0/G1 phase and the apoptosis assay showed the occurrence of early apoptosis at 48 h in MDAMB-231 cells treated with methanolic extract of A.precatorius leaves.Methanolic extract of A.precatorius leaves induced apoptosis by upregulation of Bax,p53 and caspase-3 and downregulation of Bcl-2.Conclusions:Methanolic extract of A precatorius leaves promotes MDA-MB-231 cell death by inducing cell cycle arrest and apoptosis possibly via the mitochondrial-related pathway.

大叶冬青叶中27-CAUA对人乳腺癌MDA-MB-468细胞增殖的影响

目的:结合肿瘤生物信息学与药理学,研究大叶冬青叶中三萜类化合物27-O-p-(E)-coumaroyl ursolic acid(27-CAUA)对人乳腺癌MDA-MB-468细胞增殖的影响。方法:基于TIMER和UALCAN数据库统计分析在多种癌症中CCNB1基因和细胞周期性蛋白Cyclin B1的表达;采用MTT法比较27-CAUA对人乳腺癌细胞系MDA-MB-468与正常人乳腺细胞MCF-10A的增殖抑制作用;显微镜观察27-CAUA对MDA-MB-468细胞形态的影响;利用流式细胞仪观察27-CAUA对MDA-MB-468细胞周期的影响;采用免疫荧光法检测Cyclin B1的表达。结果:Cyclin B1与乳腺癌的发生具有相关性;27-CAUA对MDA-MB-468细胞生长具有剂量依赖性抑制作用;27-CAUA干预后的MDA-MB-468细胞具有明显的细胞形态变化及细胞脱落现象;27-CAUA可降低MDA-MB-468中Cyclin B1的表达;27-CAUA阻滞MDA-MB-468细胞进入G2/M期。结论:大叶冬青叶中三萜类化合物27-CAUA可抑制人乳腺癌细胞MDA-MB-468中Cyclin B1的表达,通过影响细胞有丝分裂的进程,进而抑制人乳腺癌细胞MDA-MB-468的增殖。

Inhibition Effect of shRNA on VEGF-C in Breast Cancer Cells

Objective： To investigate the effect of RNA interfering on VEGF-C in MDA-MB-231 cells. Methods： Three small interfering RNAs （siRNAa, siRNAb, siRNAc） were prepared. The most efficient one was screened and short hairpin （shRNA） was designed, the recombinant plasmid pGenesil-1/VEGF-C was constructed, and transfeeted into MDA-MB-231 cells by Lipofectamine TM 2000. RT-PCR, Western-blot an immunohistochemical methods were performed to detect the expression of VEGF-C. Results： RT-PCR results showed that siRNAa, siRNAb, siRNAc could inhibit the growth of MDA-MB-231 cells, among which, siRNAa was the most significant, with an inhibition rate of 72.1%. The recombinant plasmid pGenesil-1/VEGF-C was successfully constructed using shRNA and pGenesil-1. VEGF-C expression was significantly inhibited as determined by RT-PCR, immunocytochemistry staining and Western blot （P〈0.05）. Conclusion： shRNA RNAi technology could silence the expression of VEGF-C in MDA-MB-231 cells, which suggested that the technology may be one of the effective methods for inhibiting lymphangiogenesis in breast cancer.

Meclizine Chloridrate and Methyl-β-Cyclodextrin Associated with Monophosphoester Synthetic Phosphoethanolamine Modulating Proliferative Potential in Triple-Negative Breast Cancer Cells

Synthetic phosphoethanolamine(Pho-s)is a monophosphoester ester with anti-inflammatory and pro-apoptotic properties.Meclizine chloridrate(MC)is a histamine H1 receptor blocker that is also able to inhibit cellular respiration.However,MC does not inhibit cellular respiration in isolated mitochondria such as antimycin and rotenone.Methyl-β-cyclodextrin(MβCD)belongs to theβ-cyclodextrin family,which is capable of removing cholesterol from the plasma membrane.The aim of this study was to evaluate the proliferative effects of meclizine chloridrate and methyl-β-cyclodextrin compounds associated with synthetic phosphoethanolamine in a triple-negative human breast tumor line,MDA-MB-231 Cell viability of the tumor line and normal cells FN1 was evaluated by MTT colorimetric test;the production of free radicals was determined by lipoperoxidation(LPO)test;and the percentage of cell cycle phases and proliferative index was evaluated by flow cytometry.Cell viability demonstrated a significant decrease with the treatments of MβCD,MC and Pho-s associated with MC.The production of free radicals decreases significantly in all treatments.In addition,a significant increase of DNA fragment and decrease in G0/G1 cell cycle phase were observed in cellular percentage with concentrations of 20 and 30 mM of Pho-s in association with MC and MβCD,respectively.

Effect of Guizhi Fuling capsule and its extracts on human breast cancer cells proliferation

OBJECTIVE To evaluate the effect of Guizhi Fuling Capsule active pharmaceutical ingredient(API)and its fractions on human breast cancer cells proliferation by high-throughput screening assay.METHODS The crude fractions were obtained from the extraction and elution of the API of Guizhi Fuling Capsule,and 929 standard fractions were obtained by the optimal separation conditions.Sulforhodamine B(SRB)method was used to evaluate the effects of the Guizhi Fuling capsule API and929 kinds of fractions on the proliferation of human breast cancer cells MCF-7 and MDA-MB-231.RESULTS The Guizhi Fuling capsule API had a strong ability to inhibit the proliferation of MCF-7 cells at high concentration and the ability to inhibit MDA-MB-231 cells' proliferate at low concentration following 72 h treatment;some samples of 929 fractions(5μg·mL^(-1))was found to have a breast cancer cell growth inhibition rate above 50%,without toxicity on HUVECs proliferation.CONCLUSION The API of Guizhi Fuling capsule had significant cytotoxicity effects on these two human breast cancer cells,with significant concentration-and time-dependent manner.

Investigating the effects of Pentoxifylline on human breast cancer cells using Raman spectroscopy

Breast cancer is one of the leading causes of cancer-related deaths in a global scenario.In the present study,biochemical changes exerted upon Pentoxifylline(PTX)treatment had been ap-praised in human breast cancer cells using Raman spectrosecopy.There are no clinically approved methods to monitor such therapeutic responses available.The spectral profiling is suggestive of changes in DNA,protein and lipid contents showing a linear relationship with drug dosage.Further,multivariate analysis using principal component based linear-discriminant-analysis(PC-LDA)was employed for dlassifying the control and the PTX treated groups.These findings support the feasibility of Raman spectroscopy as an alternate/adjunct label-free,objective method for monitoring drug-induced modifications against breast cancer cells.

Growth Inhibiton of Human Breast Cancer Cell Line MDA-MB-231 by Rosiglitazone through Activation of PPARγ

OBJECTIVE To investigate the anti-proliferative effect of rosiglitazone and its relationship to peroxisome proliferator-activated receptor γ （PPARγ） in human breast cancer cell line MDA-MB-231 and evaluate the potential application value of rosiglitazone for breast cancer therapy. METHODS The cytostatic effect of rosiglitazone on MDA- MB-231 cells was measured by the MTT assay. Cell-cycle kinetics was assessed by flow cytometry. Apoptotic cells were determined by the TUNEL assay. MDA-MB-231 cells were treated with rosiglitazone or in combination with the PPARy antagonist GW9662 to investigate the effect of rosiglitazone on cell proliferation and its relationship to PPARγ. RESULTS The results showed that rosiglitazone could inhibit growth of MDA-MB-231 cells in a dose- and time-dependent manner with an IC50 value of 5.2 μmol/L at 24 h after the drug was added into the culture. Cell cycle analysis showed that the percentage of G0/G1 phase cells increased, S phase cells decreased, and cells were arrested in G1 phase with increasing concentrations of rosiglitazone. Detectable signs of apoptotic cell death caused by rosiglitazone occurred at a concentration of 100 μmol/L and the apoptotic rate was （18 ± 3）%. PPARγ selective antagonist GW9662 could partially reverse the inhibitory effect of rosiglitazone on proliferation of MDA-MB-231 cells. CONCLUSION It was concluded that rosiglitazone can inhibit growth of MDA-MB-231 cells via PPARy activation and a high concentration of rosiglitazone can also induce MDA-MB-231 cell apoptosis. These results suggest that PPARy represents a putative molecular target for chemopreventive therapy and rosiglitazone may be effective in the treatment of breast cancer.

The establishment of stable transfection of human breast cancer cell line MDA-MD-468 with exogenous PTEN gene

To investigate exogenous PTEN gene transfected human breast cancer cell line MDA-MD-468.Methods Using the lipofectamine 2000 transfection technique,wild type PTEN gene was transducted into an in vitro cultured highly metastatic breast cancer cell line MDA-MD-468.After transfection,the cells were selected by G418.The resistant clones were chosen and expanded in DMEM culture medium.RT-PCR,immunohistochemical method and western blot were used to determine the expression of target genes.Results An anti-G418 cell clone was established and expanded in culture.The transfected PTEN gene MDA-MD-468 cells showed expression of PTEN mRNA and PTEN protein.Conclusion Human breast cancer cell line MDA-MB-468 established in this study expresses consistently exogenous PTEN genes.4 refs,6 figs.

土贝母苷甲通过AKT/NF-κB信号通路抑制三阴性乳腺癌细胞的增殖、迁徙和侵袭能力

目的探究土贝母苷甲(TBMS1)对三阴性乳腺癌(TNBC)细胞系MDA-MB-468的影响,并探求其作用机制。方法通过MTT实验测定TBMS1对细胞活性的影响并确定给药浓度,通过EDU细胞增殖实验测定TBMS1对细胞增殖能力的影响,通过细胞划痕实验测定TBMS1对细胞迁徙能力的影响,通过Transwell实验测定TBMS1对细胞侵袭能力的影响,通过Western Blot实验测定TBMS1作用于MDA-MB-468细胞的具体作用机制。结果TBMS1对MDA-MB-468细胞的增殖、迁徙和侵袭能力呈剂量依赖性抑制。而Western Blot及挽救实验结果表明:TBMS1通过抑制AKT/NF-κB信号通路发挥作用。结论TBMS1作为一种天然药物成分,在TNBC的治疗中显示出潜在的抗肿瘤活性,且具有较低的药物毒性。