Transendothelial migration of two metastatic breast carcinoma cells depend on the SDF-lalpha-CXCR4 complexes

The role of the SDF-1alpha chemokine-CXCR4 receptor system on tumor cell transendothelial migration was studied by culturing metastatic breast tumor cell lines, MDA-MB-231 and MDA-MB-435, either alone or on a HUVEC monolayer pre-established on a "Transwell" filter. After a 24-hour culture in the presence or absence of SDF-1alpha, tumor cell transmigration rates were compared. We showed that: CXCR4 is present on both cell lines; MDA-MB-231 but not MDA-MB-435 cell migration is stimulated by increasing concentrations of SDF-1alpha; neutralizing anti-CXCR4 antibody inhibits the SDF-1alpha chemoattractant effect; CXCR4 expression, measured by cytofluorometry, was enhanced after treatment with SDF-1alpha on MDA-MB-231 cells but remained unchanged on MDA-MB-435 cells; Scatchard analysis evidences 8.10(5) and 2.10(5) high affinity sites (KD range: 20 to 30 nM) on, respectively, MDA-MB-231 and MDA-MB-435 cells. These significant differences could explain the distinctive transendothelial migration responses of these two cell lines in the presence of SDF-1alpha.     

Tumorigenicity of human breast cancer is associated with loss of the Ca2+-activated chloride channel CLCA2.

The human Ca2+-activated chloride channel-2 (CLCA2) is expressed in normal breast epithelium but not in breast tumors of different stages of progression. Northern analysis of nontransformed and transformed breast epithelial cell lines revealed CLCA2 expression in the nontransformed cell line MCF10A and the nontumorigenic cell line MDA-MB-453, whereas all tumorigenic cell lines were negative (MDA-MB-231, MDA-MB-435, MDA-MB-468, and MCF7). When stably reintroduced into CLCA2-negative MDA-MB-231 and MDA-MB-435 cells, CLCA2 expression reduced Matrigel invasion in vitro and inducibility of s.c. and metastatic tumors of MDA-MB-231 cells in nude mice. Our results suggest that CLCA2 may act as a tumor suppressor in breast cancer.     

shRNA-CXCR4对人乳腺癌细胞增殖活性的影响

背景与目的：CXCR4足趋化细胞因子SDF—l（基质细胞衍生因子-1）的受体：CXCR4／SDF-1轴在肿瘤侵袭，转移中具有重要作用．阻断CXCR4／SDF-1轴，有可能成为一个新的肿瘤治疗标靶，本研究拟探讨shR-NA—CXCR4对人乳腺癌细胞株MCF-7、MDA—MB-231，MDA．MB435s细胞增殖活性的影响。方法：通过质粒shRNA—CXCR4沉默CXCR4基因后．RT—PCR，Weslernblot检测3株人乳腺癌细胞的CXCR4mRNA及其蛋白的表达；MTT．流式细胞仪检洲它们的增殖结果：质粒shRNA—CXCR4作用于3株人乳腺癌细胞后能明显抑制其CXCR4基因的tuRNA（MDA—MB-23l：实验组CXCR4／GAPDH为0．152．空白组和阴性对照组分圳为0．40及0．45．MDA-MB-435s：实验组为0．198，空白对照组和阴性对朋组分别为0．690及0．775，MCF-7：实验组为0．089，空白对照组和阴性对照组分别为0．327及0．313）及蛋白表达水平（MDA—MB-231：实验组CXCR4／β-actin为0．153，空白组和阴性对照组分圳为0．829及0．878，MDA—MB-435s：实验组为0．173，空白对照组和阴性对照组分别为0．877及0．906，MCF-7：实验组为0．177，空白对照组和阴性对照组分别为0．911及0．874）（P〈0．05）；MTT显示能明显抑制3株人乳腺癌细胞的增殖（P〈0．05）；流式细胞仪显示3株人乳腺癌细胞S期细胞数量明显减少（P〈0．05），将更多的细胞阻滞在G0／G1朗（P〈0．05）结论：shRNA—CXCR4作用于CXCR4基因后能明显抑制人乳腺癌细咆生长和增殖一可能是治疗乳腺癌的一个潜在治疗耙点。     

FSIP1促进乳腺癌细胞迁移和侵袭并导致患者不良预后

目的 探讨乳腺癌组织中纤维鞘相互作用蛋白1(FSIP1)表达对乳腺癌细胞侵袭和迁移能力的影响及其与乳腺癌患者预后的关系,从而为乳腺癌的诊断和治疗提供一定的理论参考。方法 收集2004年1月—2018年12月于哈尔滨医科大学附属肿瘤医院确诊的404例乳腺癌患者的乳腺组织样本和病例资料,对收集的乳腺癌患者资料进行回顾性分析并采用Kaplan-Meier方法绘制生存曲线,采用免疫组织化学方法分析FSIP1在乳腺癌和癌旁组织中的表达情况,取乳腺癌细胞系MCF-7、MDA-MB-231、MDA-MB-435、SK-BR-3、T-47D及正常乳腺上皮细胞(HMECs)MCF-10A进行细胞培养,采用CRISPR/CAS9技术敲除乳腺癌细胞系MDA-MB-231和SK-BR-3中的FSIP1基因,通过Western blot实验检测各乳腺癌细胞系中FSIP1蛋白的表达情况并对FSIP1基因敲除结果进行检测,通过细胞迁移和侵袭实验评估FSIP1蛋白敲除对乳腺癌细胞迁移和侵袭能力的影响。结果 与正常乳腺上皮细胞(MCF-10A)相比,乳腺癌细胞系MCF-7、MDA-MB-231、MDA-MB-435、S...     

人源电压门控质子通道对乳腺癌细胞迁移与侵袭的影响

  目的  明确人源电压门控质子通道蛋白（human voltage-gated proton channel 1,Hv1）对乳腺癌细胞迁移及侵袭能力的影响。   方法  检测Hv1在不同转移能力的人乳腺癌细胞系中的表达,利用小RNA干扰（siRNA）技术下调Hv1在乳腺癌MDA-MB-231细胞中的表达,通过细胞划痕和体外侵袭实验方法,观察Hv1对乳腺癌细胞迁移和侵袭的影响并初步探讨相关分子机制。   结果  Hv1在高转移的乳腺癌细胞MDA-MB-231中表达较高,Hv1基因的siRNA干扰片段能够抑制Hv1基因及蛋白的表达;细胞划痕和体外侵袭实验表明Hv1降表达的MDA-MB-231细胞迁移和侵袭能力较弱;明胶酶谱和免疫印迹实验证明下调Hv1基因在MDA-MB-231细胞中的表达明显抑制了MMP-2的活性。   结论  Hv1能够促进乳腺癌细胞迁移及侵袭。      

Ectopic expression of RhoBTB2 inhibits migration and invasion of human breast cancer cells

RhoBTB2, or Deleted in Breast Cancer 2 (DBC2), identified as a candidate tumor suppressor gene for breast cancer and other human malignancies, is an atypical member of a novel gene family encoding small GTPases. In this study, we found that ectopic expression of RhoBTB2 inhibits the migration and invasion of the human metastatic breast cancer cell lines MDA-MB-231 and MDA-MB-435 in a dose-dependent manner. Western blotting analysis revealed that ectopic expression of RhoBTB2 induces a significant increase in the breast cancer metastasis suppressor, BRMS1. siRNA suppression of BRMS1 expression markedly reversed the inhibitory effects of RhoBTB2 on the migration and invasion abilities of both cell lines. Ezrin is a member of the ezrin-radixin-moesin cytoskeleton-associated protein family and is a key signaling molecule that regulates cancer migration and invasion. Western blotting analysis demonstrated that ectopic expression of RhoBTB2 results in decreased phosphorylation of ezrin and Akt2 in both MDA-MB-231 and MDA-MB-435 cells. Therefore, we conclude that up-regulation of the breast cancer metastasis suppressor BRMS1 and down-regulation of the phosphorylation of the cancer metastasis-related gene, ezrin, contributed to RhoBTB2-induced inhibition of metastatic breast carcinoma cell migration and invasion. Our findings suggest that understanding RhoBTB2-mediated migration and suppression of invasion is critical to the development of new therapies designed to prevent and treat patients with breast cancer metastasis.     

miR-206抑制 SDF-1/CXCR4信号活化诱导的乳腺癌细胞迁移和增殖

目的：研究 miR-206在乳腺癌细胞中的作用及其机制。方法 MDA-MB-231细胞分别转染miRNA-NC和 miR-206 mimic 后,荧光显微镜观察转染效率。同时,细胞添加不同剂量（20 ng·mL -1和40 ng·mL -1）基质细胞衍生因子1（SDF-1）处理,利用 Transwell 法检测细胞迁移,噻唑蓝（MTT）法检测细胞增殖,qRT-PCR 法检测细胞中 CXC 趋化因子受体4（ CXCR4）mRNA 表达水平,Western blot 检测细胞中CXCR4蛋白表达水平。结果 miRNA-NC 组和 miR-206 mimic 组细胞转染效率分别为（83.4±6.3）％和（87.6±8.3）％。与对照组比较,SDF-1显著促进细胞迁移和增殖（P ﹤0.05）。miR-206 mimic 转染明显抑制细胞迁移和增殖（ P ﹤0.05）。SDF-1处理促进细胞中 CXCR4 mRNA 和蛋白的表达水平（ P ﹤0.05）。miR-206 mimic 转染则抑制 CXCR4蛋白表达水平（P ﹤0.05）,但不影响 CXCR4 mRNA 表达（P ﹥0.05）。结论 miR-206通过抑制 CXCR4表达拮抗 SDF-1诱导乳腺癌细胞迁移和增殖作用。     

乏氧环境下HO-1诱导表达对乳腺癌MDA-MB-231细胞侵袭迁移的调控作用研究

目的:研究乏氧对人乳腺癌MDA-MB-231细胞侵袭及迁移能力的影响,并研究血红素氧合酶-1(heme oxygenase-1,HO-1)在这一过程中的作用,初步探讨其作用机制。方法:利用RNA干扰技术,抑制乳腺癌MDA-MB-231细胞中HO-1的表达,得到HO-1表达受干扰的细胞系MDA-MB-231-HO-1△。通过Transwell迁移、侵袭实验分别检测常氧及乏氧条件下MDA-MB-231-NC细胞（HO-1正常表达）和MDA-MB-231-HO-1△细胞（HO-1干扰表达）迁移、侵袭能力的变化,Western blot检测乏氧条件下两组乳腺癌细胞的上皮和间质标记物的表达,检验细胞系是否发生了上皮-间质转化(epithelial-mesenchymal transition,EMT)。结果:乏氧培养24小时后,MDA-MB-231-NC 细胞中HO-1蛋白表达水平显著升高,MDA-MB-231-HO-1△细胞中HO-1表达受抑制。乏氧培养后MDA-MB-231-NC细胞的侵袭、迁移能力较常氧培养的细胞明显增强,其差异具有统计学意义(P<0.05);而MDA-MB-231-HO-1△细胞侵袭、迁移能力在乏氧和常氧培养下无显著差异。乏氧条件下,MDA-MB-231-NC细胞的上皮标志物E-cadherin表达显著下调,间质标志物Vimentin表达显著上调,而MDA-MB-231-HO-1△细胞的E-cadherin、Vimentin表达无明显变化。结论:乏氧条件下乳腺癌MDA-MB-231细胞中HO-1可被诱导高表达,促进了细胞的侵袭迁移,其可能机制是促进了乳腺癌细胞上皮-间质转化。     

Regulation of breast cancer cell motility by insulin receptor substrate-2 (IRS-2) in metastatic variants of human breast cancer cell lines.

Insulin-like growth factors (IGFs) regulate breast cancer cell proliferation, protect cells from apoptosis, and enhance metastasis. In this study, we examined the IGF signaling pathway in two breast cancer cell lines selected for metastatic behavior. LCC6 was selected for growth as an ascites tumor in athymic mice from parental MDA-MB-435 cells (435P). The MDA-231BO cell line was derived from osseous metastases that formed after intracardiac injection of the MDA-MB-231 cell line in athymic mice. Compared to the parental cell lines, IGF-I treatment enhanced IRS-2 phosphorylation over IRS-1 in the metastatic variants. IGF-I stimulated cell migration in the variant cells, but not in the parental cells. To determine the role for IRS-2 in IGF-mediated motility, we transfected MDA-231BO cells with an anti-sense IRS-2 construct. Transfected cells had decreased levels of IRS-2 with diminished IGF-mediated motility and anchorage independent growth when compared to control cells. However, adherence to fibronectin was enhanced in the transfected cells compared to MDA-231BO cells. Our data show that breast cancer cells selected for metastatic behavior in vivo have increased IRS-2 activation and signaling. In these cells, IGF-I enhances cell adhesion and motility suggesting that IRS-2 may mediate these aspects of the malignant phenotype.     

miR-100抑制乳腺癌细胞迁移的作用和机制

目的:探究miR-100对乳腺癌细胞株MDA-MB-231迁移能力的调节与机制.方法:Real time-PCR检测人正常乳腺上皮细胞MCF-10A和乳腺癌细胞株MDA-MB-231中miR-100的基础表达水平.应用脂质体法将 miR-100 mimic及阴性对照分别转染乳腺癌细胞株MDA-MB-231,通过real time-PCR检测转染后miR-100的表达水平,细胞划痕实验检测过表达miR-100对MDA-MB-231细胞迁移能力的影响,Western blot方法检测slug、snail和E-cadherin等EMT蛋白表达水平的变化.结果:miR-100在乳腺癌细胞株MDA-MB-231中的表达明显低于人正常乳腺上皮细胞MCF-10A.转染miR-100 mimic的乳腺癌细胞株MDA-MB-231的miR-100表达水平明显增高,细胞划痕实验显示过表达miR-100的MDA-MB-231细胞划痕愈合速度明显减慢.过表达miR-100的MDA-MB-231细胞E-cadherin蛋白表达水平明显增加,而slug和snail蛋白表达水平明显降低.结论:miR-100抑制乳腺癌细胞株MDA-MB-231的迁移能力与其上调E-cadherin,下调slug、snail蛋白表达,抑制EMT有关.     

Quantification of the heterogeneity in breast cancer cell lines using whole-cell impedance spectroscopy.

PURPOSE: Quantification of the heterogeneity of tumor cell populations is of interest for many diagnostic and therapeutic applications, including determining the cancerous stage of tumors. We attempted to differentiate human breast cancer cell lines from different pathologic stages and compare that with a normal human breast tissue cell line by characterizing the impedance properties of each cell line. EXPERIMENTAL DESIGN: A microelectrical impedance spectroscopy system has been developed that can trap a single cell into an analysis cavity and measure the electrical impedance of the captured cell over a frequency range from 100 Hz to 3.0 MHz. Normal human breast tissue cell line MCF-10A, early-stage breast cancer cell line MCF-7, invasive human breast cancer cell line MDA-MB-231, and metastasized human breast cancer cell line MDA-MB-435 were used. RESULTS: The whole-cell impedance signatures show a clear difference between each cell line in both magnitude and phase of the electrical impedance. The membrane capacitance calculated from the impedance data was 1.94 +/- 0.14, 1.86 +/- 0.11, 1.63 +/- 0.17, and 1.57 +/- 0.12 muF/cm(2) at 100 kHz for MCF-10A, MCF-7, MDA-MB-231, and MDA-MB-435, respectively. The calculated resistance for each cancer cell line at 100 kHz was 24.8 +/- 1.05, 24.8 +/- 0.93, 24.9 +/- 1.12, and 26.2 +/- 1.07 MOhm, respectively. The decrease in capacitances of the cancer cell lines compared with that of the normal cell line MCF-10A was 4.1%, 16.0%, and 19.1%, respectively, at 100 kHz. CONCLUSIONS: These findings suggest that microelectrical impedance spectroscopy might find application as a method for quantifying progression of cancer cells without the need for tagging or modifying the sampled cells.     

HOXD3在乳腺癌细胞干性和化疗耐药性中的作用及机制研究

  目的  探讨HOXD3表达对乳腺癌细胞干性的影响,并研究HOXD3表达与乳腺癌细胞化疗耐药的关系。  方法  收集2006年1月至2008年12月哈尔滨医科大学附属肿瘤医院87例乳腺癌患者组织标本。采用免疫组织化学染色法检测乳腺癌细胞和组织中HOXD3表达;采用RT-PCR、Western blot和免疫荧光染色法检测HOXD3在顺铂或阿霉素耐药细胞系MDA-MB-231和MDAMB-435中的表达水平,分析HOXD3过表达对乳腺癌细胞系MDA-MB-231和MDA-MB-435的干细胞生物标志物表达水平的影响;采用MTT法和集落形成实验分析HOXD3在乳腺癌细胞化疗耐药中的作用。  结果  乳腺癌组织中HOXD3 mRNA相对表达量显著高于癌旁正常组织,乳腺癌细胞系MDA-MB-231、MDA-MB-435和MCF-7的HOXD3 mRNA相对表达量均高于正常乳腺上皮细胞系MCF-10A（均P < 0.05）。顺铂或阿霉素耐药的细胞系MDA-MB-231和MDA-MB-435的半抑制浓度（half maximal inhibitory concentration,IC₅₀）分别为（20.82±0.05）μmol/L和（19.69±0.47）μmol/L,或（32.26±0.23）mmol/L和（26.08±0.55）mmol/L,均高于对应原始细胞系（均P < 0.05）;耐药倍数分别为2.47和3.10倍,或1.86和2.08倍。HOXD3过表达MDA-MB-231、MDA-MB-435的肿瘤球体数目、干细胞生物标志物的表达水平均明显增加（均P < 0.05）。  结论  HOXD3过表达对乳腺癌细胞干性的维持及化疗耐药性的发生发挥重要的作用,为制定针对肿瘤干细胞的分子靶向治疗提供理论参考。      

沉默环状RNA hsa_circ_0001785表达对乳腺癌MDA-MB-231细胞增殖、迁移及侵袭能力的影响

目的:探究环状RNA（circRNA）hsa_circ_0001785在乳腺癌组织和细胞中的表达变化及其对乳腺癌细胞增殖、迁移和侵袭能力的影响。方法:qRT-PCR实验检测hsa_circ_0001785在乳腺癌组织和乳腺癌细胞（MDA-MB-231和SK-BP-3）中的相对表达水平；CCK-8和克隆形成实验检测沉默或上调表达hsa_circ_0001785对MDA-MB-231细胞活性和克隆形成能力的影响；划痕愈合实验和Transwell侵袭实验检测沉默或上调表达hsa_circ_0001785对MDA-MB-231细胞迁移及侵袭能力的影响。结果:hsa_circ_0001785在乳腺癌组织中的相对表达水平明显高于癌旁组织，hsa_circ_0001785在MDA-MB-231和SK-BP-3细胞中的相对表达水平明显高于人乳腺上皮细胞MCF10A。在MDA-MB-231细胞沉默hsa_circ_0001785，MDA-MB-231细胞的活性和克隆形成能力明显降低，迁移距离显著减少，侵袭能力也明显下降。而在MDA-MB-231细胞中上调表达hsa_circ_0001785，MDA-MB-231细胞的活性和克隆形成能力显著升高，迁移距离明显升高，侵袭能力也明显升高。结论:hsa_circ_0001785在乳腺癌组织和乳腺癌细胞（MDA-MB-231和SK-BP-3）中的表达水平明显升高；沉默hsa_circ_0001785显著抑制乳腺癌MDA-MB-231细胞的增殖、迁移和侵袭能力，而上调表达hsa_circ_0001785明显促进乳腺癌MDA-MB-231细胞的增殖、迁移和侵袭能力。     

FRNK对人乳腺癌MDA-MB-435细胞迁移的抑制作用

背景与目的:粘着斑激酶(focaladhesionkinase,FAK)的高表达或过度激活与肿瘤迁移密切相关。粘着斑相关非激酶(FAKrelatednon-kinase,FRNK)是FAK内源性抑制剂,通过与FAK竞争粘着斑结合位点抑制FAK活性。本研究旨在探讨FRNK对人乳腺癌细胞MDA-MB-435迁移的抑制作用及相关机制。方法:RT-PCR法克隆目的基因FRNK,构建pcDNA3.1-FRNK重组质粒;利用脂质体转染MDA-MB-435细胞,经G418筛选抗性单细胞克隆,通过Westernblot鉴定稳定高表达FRNK蛋白的MDA-MB-435细胞并检测其与野生型MDA-MB-435细胞中基质金属蛋白酶-9(matrixmetalloproteinase9,MMP-9)表达水平;采用体外划痕修复实验和Boyden趋化小室比较野生型和稳定高表达FRNK蛋白的MDA-MB-435细胞的非定向及定向迁移运动能力。结果:成功构建真核表达重组质粒pcDNA3.1-FRNK,建立稳定高表达FRNK蛋白的MDA-MB-435细胞。高表达FRNK的细胞较野生型MDA-MB-435细胞MMP-9蛋白表达降低73.1%。在划痕修复实验中,稳定高表达FRNK蛋白的MDA-MB-435细胞移行面积与空白面积之比为0.35±0.02,与野生型MDA-MB-435细胞(0.58±0.06)相比划痕修复能力明显减弱(P<0.05);在趋化小室实验中,高表达FRNK蛋白的MDA-MB-435细胞迁移数为65.15±8.56,仅为野生型MDA-MB-435细胞迁移数(97.86±5.44)的66.57%。结论:FRNK可抑制MDA-MB-435细胞迁移运动,该抑制作用与MDA-MB-435细胞中MMP-9表达下调有关。     

鞣花酸对乳腺癌细胞MDA-MB-231增殖及SDF1α/CXCR4信号通路的影响

目的 探讨鞣花酸对乳腺癌细胞MDA-MB-231的增殖侵袭转移的作用.方法 采用0（对照）、6、12 μg/ml鞣花酸培养液分别处理乳腺癌细胞MDA-MB-231,分别于培养后24、48、72 h计数MDA-MB-231细胞数.细胞趋化实验观察鞣花酸对MDA-MB-231细胞趋化运动的影响,Western Blot 观察鞣花酸对乳腺癌细胞MDA-MB-231中SDF-1α信号通路激活的抑制作用.数据分析采用重复测量的方差分析,两两比较采用SNK-q分析方法.结果 与对照组比较,6、12 μg/ml鞣花酸处理组在24、48、72 h的细胞计数显著降低.重复测量的方差分析结果提示分组比较（F=4875.56,P=0.00）及三个时间点间比较（F=670.73,P=0.00）差异有统计学意义,而分组与时间有交互作用（F=122.92,P=0.00）,表明鞣花酸对乳腺癌MDA-MB-231细胞增殖有显著抑制作用.乳腺癌细胞趋化运动实验提示各组乳腺癌细胞的趋化数分别为（14.00±1.00）＆#215;105/ml、（7.70±0.58）＆#215;105/ml、（3.00±1.00）＆#215;105/ml,差异有统计学意义（F=117.57,P=0.00）.Western Blot结果显示鞣花酸明显抑制CXCR4表达及SDF1α/CXCR4对乳腺癌细胞AKT信号通路的激活.结论 鞣花酸可抑制乳腺癌MDA-MB-231细胞增殖,SDF1α/CXCR4介导的细胞趋化运动及其SDF1α/CXCR4信号通路激活,在预防乳腺癌复发及转移中可能有潜在价值.     

Positive regulation of migration and invasion by vasodilator-stimulated phosphoprotein via Rac1 pathway in human breast cancer cells

This study aimed to investigate the role of the cytoskeleton-associated protein vasodilator-stimulated phosphoprotein (VASP) on the migration and invasion of human breast cancer cells and its relationship to Rac1 which is a member of the Rho family and has been found to be implicated in tumorigenesis, invasion and metastasis. We detected the mRNA and protein expression levels of VASP and Rac1 of the non-invasive breast cancer cell line MCF-7 as well as the invasive cell line MDA-MB-231 by RT-PCR and Western blotting. GST pull-down assay was used to examine the activitiy of Rac1. Accordingly, the cell invasive migration ability was analyzed in a wound-healing assay (2D) and transwell assays (3D migration and invasion). We then used VASP-siRNA to inhibit the expression of VASP in breast cancer cells in order to study the relationship between the VASP expression level and the invasive migration ability of breast cancer cells. Rac1-siRNA was used to decrease the expression of Rac1, and observe its effect on the VASP expression level together with the migration and invasion ability of MCF-7 and MDA-MB-231 cells. Our results revealed that the invasive breast cancer cell line MDA-MB-231 showed a higher Rac1 activity and VASP expression level compared with the non-invasive MCF-7. Inhibition of Rac1 or VASP by siRNA, respectively, decreased the migration and invasion ability of breast cancer cells and the transfection of Rac1 siRNA-mediated reduction of VASP expression at mRNA and protein levels. Collectively, our data showed that the higher expression level of VASP contributed to a higher invasive migration capacity of human breast cancer cells which was controlled by the Rac1 pathway.     

Role for glucose transporter 1 protein in human breast cancer

Glycolysis is increased in cancer cells compared with normal cells. It has been shown that glucose enters cells via a family of five functional glucose transporters (GLUT). However, GLUT expression appears to be altered in human breast cancer, which may serve as a selective advantage and facilitate the metastatic potential of these cells. The relationship of GLUT isoform expression and breast cancer cell invasiveness has not been adequately addressed. Thus, the purpose of this study was to investigate whether an association exists between GLUT expression and human breast cancer cell invasiveness. Invasiveness of the human breast cancer lines MCF-7, MDA-MB-435 and MDA-MB-231 was measured using anin vitro assay and compared with cellular GLUT isoform expression, assessed by Western blot analysis and verified by immunohistochemistry in a poorly differentiated human ductal breast cancer. Cell surface GLUT-1 expression was associated with the invasive ability of MCF-7 (2.0 ± 0.02%), MDA-MB-435 (6.4 ±0.4%), and MDA-MB-231 (19.3 ± 2.0%). However, GLUT-2 and GLUT-5 were inversely associated with invasiveness; GLUT-3 expression was variable; and GLUT-4 was undetected. In a poorly differentiated human ductal breast cancer,in situ GLUT-1 staining was intense. GLUT-1 expression was associated with the in vitro invasive ability of human breast cancer cells which was validatedin situ. If this relationship is found to exist in a larger number of human breast cancer tissues, it may be possible to develop diagnostic and therapeutic strategies based on targeted GLUT isoform expression.     

c-Met蛋白在CCL5诱导的乳腺癌MDA-MB-231细胞迁移中的作用

目的:探讨c-Met蛋白在CC型趋化因子5(CCL5)诱导的乳腺癌MDA-MB-231细胞迁移中的作用.方法:Western-Blot检测乳腺癌MDA-MB-231细胞表面CCL5受体(CCR5)的表达情况;Transwell法检测CCL5诱导的MDA-MB-231细胞迁移能力的变化;Western-Blot检测CCL5刺激后MDA-MB-231细胞c-Met及磷酸化c-Met(p-Met)的表达.结果:乳腺癌MDA-MB-231细胞表面高表达CCR5蛋白;CCL5增强MDA-MB-231细胞的迁移能力,沉默CCR5基因后抑制了CCR5蛋白表达,MDA-MB-231细胞迁移能力降低;MDA-MB-231细胞表达的p-Met水平在CCL5刺激10 min后明显升高.结论:CCL5/CCR5信号通路可以促进乳腺癌MDA-MB-231细胞的迁移能力,c-Met蛋白参与CCL5诱导的乳腺癌MDA-MB-231细胞迁移.