Role of interleukin-8 in the progression of estrogen receptor-negative breast cancer

Background Estrogen receptor (ER) is a very important biomarker of breast cancer. ER deletion has been consistently associated with tumor progression, recurrence, metastasis and poor prognosis, but the biological mechanism is still unclear. ER negative breast cancer expresses high levels of interleukin-8 (IL-8). ER expression can downregulate IL-8 promotor activity. As a multifunctional cytokine, IL-8 has many important biological activities in tumor genesis and development. With the goal of investigating the role of IL-8 in ER-negative breast cancer progression, we applied RNA interference technology to specifically knockdown the IL-8 expression in ER-negative breast cancer cell line MDA-MB-231. Methods Interfering pRNA-IL-8 and the control was transfected into ER(-) MDA-MB-231. The proliferation, cell apotosis, and invasive ability were recorded in transfected, untransfected and negative transfected cells. These cells were injected into nude mice to assess tumorigenicity, proliferation, metastasis and microvessel density (MVD).Results In vitro, decreased expression of IL-8 was associated with reduced cell invasion (P＜0.001), but had no effect on cell proliferation (P＞0.05). In vivo, neutrophils infiltration was significantly inhibited in pRNA-IL-8 transfected cells compared with untransfected and negatively transfected cells (P＝0.001, P＜0.001). Less metastasis was found in transfected cells compared with negatively transfected cells (0% vs 80%, P＝0.048). Nevertheless, we observed less MVD in transfected cells compared with control in nude mice (P＜0.001).Conclusions IL-8 inhibits ER-negative breast cancer cell growth and promotes its metastasis in vivo, which may be correlated with neutrophils infiltration induced by IL-8.     

Functional expression of voltage-gated sodium channels Nav1.5 in human breast caner cell line MDA-MB-231

Voltage-gated sodium channels （VGSCs） are known to be involved in the initiation and progression of many malignancies, and the different subtypes of VGSCs play important roles in the metastasis cascade of many tumors. This study investigated the functional expression of Nav1.5 and its effect on invasion behavior of human breast cancer cell line MDA-MB-231. The mRNA and protein expression of Nav1.5 was detected by real time PCR, Western Blot and immunofluorescence. The effects of Nav1.5 on cell proliferation, migration and invasion were respectively assessed by MTT and Transwell. The effects of Nav1.5 on the secretion of matrix metalloproteases （MMPs） by MDA-MB-231 were analyzed by RT-PCR. The over-expressed Nav 1.5 was present on the membrane of MDA-MB-231 cells. The invasion ability in vitro and the MMP-9 mRNA expression were respectively decreased to （47.82±0.53）% and （43.97±0.64）% （P〈0.05） respectively in MDA-MB-23 t cells treated with VGSCs specific inhibitor tetrodotoxin （TTX） by blocking Navl.5 activity. It was concluded that Navl.5 functional expression potentiated the invasive behavior of human breast cancer cell line MDA-MB-231 by increasing the secretion of MMP-9.     

Shugan Liangxue Decoction (舒肝凉血方) Down-Regulates Estrogen Receptor α Expression in Breast Cancer Cells

Objective: To observe the effect of Shugan Liangxue Decoction(舒肝凉血方, SGLXD) on estrogen receptor α(ERα) in human breast cancer cells. Methods: The effect of SGLXD(0.85–5.10 mg/m L) on the proliferation of breast cancer cells were evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide(MTT) assay. The nuclear ERα protein levels in MCF-7, T47 D and ZR-75-1 cells which treated by SGLXD for 24 h were examined by western blot and immunofluorescence assay. MCF-7 and MDA-MB-231 cells were treated by 17β-estradiol(E2) with or without SGLXD, for 24 h, and the E2 targeted genes c-myc and bcl-2 protein product was evaluated by western blot. Results: SGLXD showed dose-dependent inhibition on the proliferation of MCF-7, T47 D and ZR-75-1 cells, but did not inhibit the proliferation of MDA-MB-231 cells. Furthermore, the promotive effect on cell growth induced by E2 was also significantly inhibited by SGLXD treatment. With the treatment of 1.70, 3.40, 5.10 mg/m L SGLXD, the nuclear ERα protein level was reduced to 88.1%, 70.4% and 60.9% in MCF-7 cells, and was decreased to 43.0%, 38.4% and 5.9% in ZR-75-1 cells as compared with the control group. In T47 D cells, the nuclear ERα protein was down-regulated to 51.3% and 4.3% by 3.40 and 5.10 mg/m L SGLXD treatment. The down-regulative effect of SGLXD on nuclear ERα was confirmed by immunofluorescence assay. SGLXD decreased the protein product of c-myc and bcl-2. Conclusions: SGLXD may exhibit selective inhibition effect on the proliferation of ER positive breast cancer cells. SGLXD reduced the nuclear ERα expression and the protein product of E2 target gene c-myc and bcl-2.     

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 G₀/G₁ phase and cell arrest at the G₂/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.     

Vascular endothelial growth inhibitor affects the invasion, apoptosis and vascularisation in breast cancer cell line MDA-MB-231

Background Breast cancer is one of the most common malignant female diseases worldwide.It is a significant threat to every woman＇s health.Vascular endothelial growth inhibitor （VEGI） is known to be abundant in endothelial cells.According to previous literature,overexpression of VEGI has been shown to inhibit tumor neovascularisation and progression in cellular and animal models,but there has been limited research on the significance of VEGI in the breast cancer.Methods In our study,cell lines MDA-MB-231 were first constructed in which VEGI mediated by lentivirus over-expressed.The effects of VEGI over-expression on MDA-MB-231 cells were investigated both in vitro and in vivo.The expression of VEGI in the MDA-MB-231 cells after infection of lentivirus was analyzed using real-time PCR and Western blotting.The effect of the biological characteristics of MDA-MB-231 cells was assessed by growth,invasion,adhesion,and migration assay with subcutaneous tumor-bearing nude mice models.Then the growth curves of the subcutaneous tumors were studied.Expressions of VEGI,CD31 and CD34 in the tumors were analyzed by immunohistochemistry and apoptosis was detected by flow cytometry and immunohistochemistry.Results Infection of MDA-MB-231 cells within the lentivirus resulted in approximately a 1 000-fold increase in the expression of VEGI.As can be seen in the invasion,adhesion and migration assay,the over-expression of VEGI can inhibit the ability of MDA-MB-231 cells during migration,adhesion and invasion.The volume of the subcutaneous tumor in the over-expression group was distinctly and significantly less than that of the control groups.Immunohistochemistry analysis of the tumor biopsies cleady showed the expression of VEGI in the over-expression group increased while CD31 and CD34 decreased significantly.In vitro and in vivo,the early apoptosis rate and the apoptosis index were increased within the VEGI over-expression group as compared with the control group.Conclusions Taken together,recombinant lentivirus that were successfully constructed,demonstrated up-regulated VEGI gene expression in breast cancer cells.Lentivirus-mediated over-expression of VEGI weakened the ability of the breast cancer cell migration,adhesion and invasion.Over-expression of VEGI diminished the tumorigenic capacity of breast cancer cells in vivo.Up-regulation of VEGI gene expression however inhibited breast cancer MDA-MB-231 cell in the early apoptosis.     

Inhibitory Effects of Mild Hyperthermia plus Docetaxel Therapy on ER（＋/-） Breast Cancer Cells and Action Mechanisms

Summary： The purpose of this study was to verify that a combination of mild hyperthermia and do- cetaxel chemotherapy produces synergistic antitumor effects and to explore the action mechanisms of this treatment approach. The effects of docetaxel on the proliferation of cells from the estrogen receptor （ER）-positive human breast cancer cell line MCF-7 and the ER-negative human breast cancer cell line MDA-MB-453 were examined by 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide （MTT） assay, and effective experimental concentrations of docetaxel were determined. The effects of mild hy- perthermia plus docetaxel therapy on apoptosis rate in the MCF-7 and MDA-MB-453 human breast cancer cell lines were analyzed by using flow cytometry with Annexin-V fluorescein isothiocyanate （FITC）/propidium iodide （PI） staining. The effects of these combined treatments on cell cycle progres- sion in the MCF-7 and MDA-MB-453 human breast cancer cell lines were examined by using flow cy- tometry. The effects of these combined treatments on the expression of apoptosis-related proteins and proteins in the mitogen-activated protein kinase （MAPK） pathways were analyzed by using Western blotting. The effects of these combined treatments on the expression of the heat shock protein 70 （HSP70） and the multi-drug resistance （MDR） gene product P-glycoprotein （Pgp） were examined by using Western blotting. The results showed that the half-maximal inhibitory concentration （IC50） of do- cetaxel for MCF-7 and MDA-MB-453 cells was 19.57±1.12 and 21.64±2.31 gmol/L respectively. Mild hyperthermia with docetaxel therapy could increase apoptosis rate in the MCF-7 and MDA-MB-453 cells. Apoptosis rate in MCF-7 and MDA-MB-453 cells was increased from （23.66±3.59）% and （18.51±3.17）% in docetaxel treatment group to （47.12±6.73）% and （55.16±7.42）% in mild hyperthermia plus docetaxel group, indicating that the mild hyperthermia and docetaxel therapeutic approaches exhib- ited significant synergistic antitumor effects. Treatments of mild hyperthermia plus docetaxel induced G2/M cell cycle arrest in the MCF-7 and MDA-MB-453 cells. Western blotting demonstrated that pro- teins in the MAPK pathway were expressed at higher levels in docetaxel-treated cells following mild hypothermia than those in cells treated with docetaxel alone. As compared with blank control group, cells from the mild hyperthermia plus docetaxel group exhibited significantly decreased B-cell lym- phoma 2 （Bcl-2） protein expression but slightly increased Bcl-2-associated X protein （Bax） expression. Western blotting results revealed that HSP70 and Pgp expression levels were significantly increased following mild hypothermia. It was concluded that treatments of mild hyperthermia plus docetaxel in- hibited the proliferation of human breast cancer cells, promoted apoptosis of breast cancer cells, and produced synergistic antitumor effects.     

Vascular endothelial growth inhibitor (VEGI) affects the invasion, apoptotics and vascularisation in breast cancer cell line MDA-MB-231

Background: Breast cancer is one of the most common malignant female diseases worldwide. It is a significant threat to every woman’s health. Vascular endothelial growth inhibitor (VEGI) is known to be abundant in endothelial cells. According to previous literature overexpression of VEGI has been shown to inhibit tumor neovascularisation and progression in cellular and animal models, but there has been limited research on the significance of VEGI in breast. Methods: In our study, cell lines MDA-MB-231were first constructed in which VEGI is lentivirus-mediatedly over-expressed. The effects of VEGI over-expression on MDA-MB-231 cells were investigated both in vitro and in vivo. The expression of VEGI in the MDA-MB-231 cells after infection of lentivirus was analyzed using real-time PCR and Western blot. The effect of biological characteristics of MDA-MB-231 cells was assessed by growth, invasion, adhesion, and migration assay with subcutaneous tumor-bearing nude mice models. Then the growth curves of the subcutaneous tumors were studied. Expressions of VEGI, CD31 and CD34 in the tumors were analyzed by immunohistochemistry and apoptosis was detected by flow cytometry and immunohistochemistry. Results: Infection of MDA-MB-231 cells within the lentivirus resulted in an approximately a 1000-fold increase in the expression of VEGI. As can be seen in the invasion, adhesion and migration assay - the over-expression of VEGI can inhibit the ability of MDA-MB-231 cells during migration, adhesion and invasion. The volume of the subcutaneous tumor in over-expression group was distinctly and significantly less than that of the controlled groups. Immunohistochemistry analysis of the tumor biopsies clearly showed the expression of VEGI in the over-expression group increased while CD31 and CD34 decreased significantly. In vitro and in vivo, the early apoptosis rate and the apoptosis index were increased within the VEGI over-expression group as compared with the control group. Conclusions: Taken together, recombinant lentivirus that were successfully constructed, demonstrated up-regulated VEGI gene expression in breast cancer cells. In vitro, lentivirus-mediated over-expression of VEGI weakened the ability of the breast cancer cell migration, adhesion and invasion. Over-expression of VEGI diminished the tumorigenicity capacity of breast cancer cells in vivo. Up-regulation of VEGI gene expression however inhibited breast cancer MDA-MB-231 cell in the early apoptosis In vitro and In vivo.     

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-200c inhibits metastasis of breast cancer cells by targeting HMGB1

miR-200c has been shown to regulate the epithelial-mesenchymal transition （EMT） by inhibiting ZEB1 and ZEB2 expression in breast cancer cells. This study further examined the role of miR-200c in the invasion and metastasis of breast cancer that goes beyond the regulation on ZEB1 and ZEB2 expression. In this study, the bioinformatics software （miRanda） was used to predict the target gene of miR-200c and Renilla luciferase assay to verify the result. The metastatic breast cancer cells MDA-MB-231 were cultured and transfected with the miR-200c mimic or inhibitor. The expressions of miR-200c and HMGB 1 were detected by RT-PCR and Western blotting, respectively. Transwell assay and wound healing assay were employed to examine the invasive and migrating ability of transfected cells. Target prediction and Renilla luciferase analysis revealed that HMGB1 was a putative target gene of＇miR-200c. After transfection of MDA-MB-231 cells with the miR-200c mimic or inhibitor, the expression of miR-200c was significantly increased or decreased when compared with cells transfected with the miR-200c mimic NC or inhibitor NC. Moreover, the expression of HMGB1 was reversely correlated with that of miR-200c in transfected cells. Tranwell assay showed that the number of invasive cells was significantly reduced in miR-200c mimic group when compared with miR-200c inhibitor group. It was also found that the migrating ability of cells transfected with miR-200c mimics was much lower than that of cells transfected with miR-200c inhibitors. It was suggested that miR-200c can suppress the invasion and migration of breast cancer cells by regulating the expression of HMGB1. miR-200c and HMGB1 may become useful biomarkers for progression of breast cancer and targets of gene therapy.     

厚朴酚葡萄糖苷对人乳腺癌细胞增殖、侵袭、迁移的影响

目的:探索联苯型新木脂素类化合物厚朴酚葡萄糖苷（magnolol-2-O-β-D-glucopyranoside,Mag-glu）对人乳腺癌细胞增殖、侵袭、迁移能力的影响,并对其可能机制进行研究。方法:MTT法检测化合物对MCF-7和MDA-MB-231细胞增殖的影响;细胞划痕实验和Transwell小室法检测化合物对人乳腺癌细胞运动、侵袭和迁移能力的影响;Western blotting法检测化合物对缺氧诱导因子1α（HIF-1α）、基质金属蛋白酶-9（MMP-9）和环氧化酶2（COX-2）蛋白表达的影响。结果:Mag-glu具有抑制MCF-7和MDA-MB-231细胞增殖的作用,且呈现浓度和时间依赖性。划痕实验结果表明,经过不同浓度的Mag-glu处理MDA-MB-231细胞24 h后,细胞水平运动运动能力明显下降（P<0.01）。Transwell结果显示,经过不同浓度的Mag-glu处理细胞24 h和48 h后,细胞迁移和侵袭能力显著下降。Western blotting结果显示,随着Mag-glu浓度的增加,HIF-1α、MMP-9、COX-2的表达均下调。结论:Mag-glu在体外能够抑制人乳腺癌细胞的增殖、侵袭和迁移,其机制可能是抑制了HIF-1α信号途径,导致其下游顾客蛋白COX-2和MMP-9的表达下调有关。     

姜黄素对人乳腺癌细胞增殖的抑制效应及机制

目的 研究姜黄素对人乳腺癌细胞株增殖的抑制效应及其机制。方法 采用Northern印迹和Western印迹法观察人乳腺癌细胞mRNA及其蛋白表达;用CAT报告基因来研究人雌激素反应元件(ERE)的转录活性;用Matrigd侵袭池(Matrigel invasion chamber)研究细胞侵袭性。结果 姜黄素能够抑制雌激素受体(ER)阳性MCF—7及ER阴性MDA—MB—231两种人乳腺癌细胞的增殖。对MCF—7细胞,姜黄素调节ER下调基因pS2和TGF—α的表达及ERE的活性;对MDA—MB—231乳腺癌细胞,姜黄素通过下调MMP—2和上调TIMP—1的活性表现出很强的抗侵袭活性,其还能够抑制MDA—MB—231细胞两个主要的血管生成因子VEGF和b—FGF、在转录水平的表达。结论 姜黄素通过多种机制抑制乳腺癌细胞的生长,姜黄素的化学预防是多途径作用的结果。     

降低COX-2表达与乳腺癌细胞迁移和侵袭关系的研究

目的 探讨利用小RNA干扰技术降低COX-2表达对高度恶性乳腺癌MDA-MB-231细胞趋化和侵袭能力的影响.方法 应用合成的小RNA干扰质粒转染MDA-MB-231细胞株,采用逆转录-聚合酶链反应(RT-PCR)检测COX-2mRNA的表达.通过划痕实验检测细胞的运动能力;体外侵袭实验检测细胞的侵袭能力;应用细胞黏附...     

miR-760靶向CDK8基因对人乳腺癌细胞 MDA-MB-231增殖与迁移的影响

目的探讨miR-760对人乳腺癌细胞中CDK8蛋白表达影响及其在乳腺癌细胞MDA-MB-231中的功能。方法使用实时定量PCR方法检测miR-760在人乳腺癌细胞中的表达;使用脂质体介导的miRNA转染、Western印迹法、MTr法、流式细胞仪技术分别检测转染miR-760前后CDK8蛋白表达差异及其对乳腺癌细胞增殖、迁移等细胞功能和细胞周期的影响。结果人乳腺癌细胞中miR-760表达水平较正常乳腺细胞降低;外源性上调miR-760可有效抑制人乳腺癌细胞株MDA-MB-231CDK8蛋白表达（抑制效率为46．3％,P〈0．05）;人乳腺癌细胞株MDA-MB-231转染miR-760后,其细胞增殖、迁移能力显著降低（P〈0．05）。结论miR-760可能通过靶向CDK8影响人乳腺癌细胞增殖与迁移,在乳腺肿瘤发生发展中起到抑癌基因作用。     

乳腺癌雌激素受体阳性细胞对雌激素受体阴性细胞增殖的影响

目的探讨雌激素受体(ER)表达不同的乳腺癌细胞间相互作用。方法 PCR法检测MDA-MB-231及MCF-7细胞中ER的基因表达。CCK-8法检测17β-雌二醇对MCF-7和MDA-MB-231细胞生长增殖的影响。将MDA-MB-231(雌激素受体阴性细胞)用羧基荧光素二醋酸盐琥珀酰亚胺酯(CFSE)法标记荧光信号,将其分别与MCF-7细胞(雌激素受体阳性细胞)和未标记荧光的MDA-MB-231细胞(雌激素受体阴性细胞)用Transwell侵袭小室分层共培养,加入或不加入雌二醇,检测MDA-MB-231细胞的增殖差异。结果 MCF-7细胞表达雌激素受体α(ESR1,ERα)和雌激素受体β(ESR2,ERβ),而MDA-MB-231细胞均不表达。17β-雌二醇浓度为10-11 mol/L时促MCF-7增殖作用最大,与对照组相比差异具有统计学意义(P<0.05),对MDA-MB-231细胞则无明显作用(P>0.05)。在加入雌二醇培养的MCF-7细胞与MDA-MB-231细胞小室分层共培养组,经流式细胞仪检测发现MDA-MB-231平均荧光强度较对照组显著降低。结论雌激素受体阳性细胞在雌激素作用下,可促进雌激素受体阴性细胞的增殖。     

RNA干扰VEGF-C基因下调COX-2、Bcl-2表达对乳腺癌细胞凋亡的影响

 目的 利用人血管内皮生长因子-C（vascular endothelial growth factor-C,VEGF-C）小RNA干扰（siRNA）表达载体——重组质粒pSilencer3.0-VEGF-C/siRNA,研究VEGF-C基因下调抑制COX-2、Bcl-2表达及对人乳腺癌细胞株MDA-MB-435的体外作用。方法 pSilencer3.0-VEGF-C/siRNA表达质粒和阴性对照质粒稳定转染人乳腺癌细胞株MDA-MB-435、RT-PCR和Western blot检测转染前后VEGF-C、COX-2基因和VEGF-C、COX-2、Bc1-2蛋白的表达;MTT法和流式细胞仪检测VEGF-C RNA干扰对细胞的作用。结果 pSilencer3.0-VEGF-C/siRNA转染乳腺癌细胞MDA-MB-435、VEGF-C基因和蛋白水平表达量明显降低,COX2和Bcl-2表达下调,细胞体外活性下降,72 h后凋亡率达60%。结论 针对人VEGF-C基因的siRNA表达载体抑制VEGF-C表达的同时下调COX-2和Bcl-2的表达,促进乳腺癌细胞MDA-MB-435的凋亡。     

番茄红素对乳腺癌细胞MCF-7和MDA-MB-231增殖的影响

目的 观察番茄红素对体外培养的雌激素受体阳性(ER )乳腺癌细胞MCF-7和雌激素受体阴性(ER-)乳腺癌细胞MDA-MB-231的存活率、细胞周期及凋亡的影响.方法 采用MTT法和H3-TdR 掺入法观察番茄红素对两种细胞增殖的影响;流式细胞仪观察同步化的细胞经番茄红素作用后细胞周期及凋亡的变化.结果 番茄红素抑制MCF-7、MDA-MB-231细胞的增殖和DNA合成,具有剂量效应关系,随着时间延长,抑制作用增强,最大抑制率分别为52.6%、61.9%.流式细胞仪结果显示,番茄红素作用24 h后,MCF-7、MDA-MB-231细胞周期各相发生变化,G0/G1期细胞增多,而S期和G2/M期细胞减少,同时可诱发MDA-MB-231细胞凋亡.结论 番茄红素通过阻滞MCF-7细胞于G1期而抑制该细胞的增殖,而对MDA-MB-231细胞增殖的抑制除可通过阻滞细胞周期进程外,还与诱导凋亡有关.     

钙蛋白酶抑制剂Calpeptin对乳腺癌MDA-MB-231细胞迁移的影响

目的:探讨钙蛋白酶抑制剂Calpeptin对乳腺癌MDA-MB-231细胞迁移能力的影响,为治疗乳腺癌转移提供思路。方法:MTT法检测不同浓度Calpeptin对MDA-MB-231细胞增殖的影响;细胞划痕实验及Transwell迁移实验检测不同浓度的Calpeptin对MDA-MB-231细胞迁移的影响;Western blot法检测不同浓度Calpeptin对MDA-MB-231细胞基质金属蛋白酶-2表达的影响。结果:Calpeptin可抑制MDA-MB-231细胞的增殖,其增殖抑制作用随浓度的增大而增加（P<0.01）。Calpeptin作用MDA-MB-231细胞24 h后,细胞的迁移能力明显下降（P<0.01）。Western blot结果显示,Calpeptin可下调MDA-MB-231细胞中细胞基质金属蛋白酶-2的表达。结论:Calpeptin能够抑制乳腺癌MDA-MB-231细胞迁移,其机制可能与下调MMP-2的表达有关。     

三氧化二砷对乳癌细胞系MDA-MB-468雌激素受体表达的影响

目的:探讨三氧化二砷(As2O3)对人雌激素受体α(ERα)阴性的乳癌细胞株MDA-MB-468进行药物诱导后ERα启动子CPG岛的甲基化状态及蛋白的变化。方法:常规培养MDA-MB-468细胞,采用MTT法检测0.5、1.0、2.0、4.0、8.0和16.0mmol/LAs2O3分别处理24、48和72h后细胞的生长抑制率,甲基化特异性PCR检测1.0、2.0、4.0μmol/LAs2O3处理72h后MDA-MB-468细胞ERα启动子CpG岛的甲基化状态,Westernblot检测1.0、2.0、4.0μmol/LAs2O3处理72h后MDA-MB-468细胞ERα蛋白的表达情况。结果:As2O3可抑制MDA-MB-468细胞增殖,其作用呈时间和剂量依赖性(F浓度=375.603,F时间=474.827,P<0.001)。经1.0、2.0、4.0μmol/LAs2O3处理后的MDA-MB-468细胞启动子CpG岛甲基化水平降低,ERα蛋白重新表达。结论:As2O3明显抑制MDA-MB-468增殖,适当浓度As2O3能诱导ERα去甲基化,使ERα阴性的MDA-MB-468细胞恢复表达ERα。