Increased expression of P-glycoprotein and doxorubicin chemoresistance of metastatic breast cancer is regulated by miR-298

MicroRNAs (miRNAs) are short, noncoding RNA molecules that regulate the expression of a number of genes involved in cancer; therefore, they offer great diagnostic and therapeutic targets. We have developed doxorubicin-resistant and -sensitive metastatic human breast cancer cell lines (MDA-MB-231) to study the chemoresistant mechanisms regulated by miRNAs. We found that doxorubicin localized exclusively to the cytoplasm and was unable to reach the nuclei of resistant tumor cells because of the increased nuclear expression of MDR1/P-glycoprotein (P-gp). An miRNA array between doxorubicin-sensitive and -resistant breast cancer cells showed that reduced expression of miR-298 in doxorubicin-resistant human breast cancer cells was associated with increased expression of P-gp. In a transient transfection experiment, miR-298 directly bound to the MDR1 3' untranslated region and regulated the expression of firefly luciferase reporter in a dose-dependent manner. Overexpression of miR-298 down-regulated P-gp expression, increasing nuclear accumulation of doxorubicin and cytotoxicity in doxorubicin-resistant breast cancer cells. Furthermore, down-regulation of miR-298 increased P-gp expression and induced doxorubicin resistance in sensitive breast cancer cells. In summary, these results suggest that miR-298 directly modulates P-gp expression and is associated with the chemoresistant mechanisms of metastatic human breast cancer. Therefore, miR-298 has diagnostic and therapeutic potential for predicting doxorubicin chemoresistance in human breast cancer.     

c-Met对三阴性乳腺癌细胞增殖及阿霉素耐药性的影响

目的:研究c-Met对三阴性乳腺癌细胞株MDA-MB-231活力及对阿霉素耐药性的影响。方法:构建阿霉素耐药的MDA-MB-231/ADR细胞系,实时荧光定量PCR及Western blotting技术检测不同细胞系中c-Met mRNA及蛋白的表达。脂质体转染c-Met-siRNA及表达质粒或AKT-siRNA,Western blotting检测转染效率;四甲基偶氮唑法(MTT法)检测细胞的活力及对阿霉素的敏感性。结果:对阿霉素耐药的MDA-MB-231/ADR细胞中cMet的mRNA及蛋白表达均显著高于对照的MDA-MB-231细胞,转染高表达c-Met的质粒可增加MDA-MB-231细胞的活力并降低其对阿霉素的敏感性,而利用siRNA抑制耐药细胞株中c-Met的表达后,可以逆转MDA-MB-231/ADR细胞对阿霉素的耐药。此外,c-Met可以磷酸化激活细胞中的AKT,并通过该信号分子增加MDA-MB-231细胞活力并诱导耐药。结论:c-Met可作为一个重要的靶点应用于三阴性乳腺癌的治疗。     

不同乳腺癌细胞系中TLR5 和NLRC4 受体的表达和定位

目的:探究TLR5 和NLRC4 受体在不同乳腺癌细胞系MDA-MB-231、MCF-7 和MDA-MB-435 中的表达和定位情况,并探讨重组鞭毛素蛋白对乳腺癌细胞TLR5 受体的激活情况。方法:利用Real-time PCR 法检测MDA-MB-231、MCF-7 和MDA-MB-435 细胞TLR5 和NLRC4 mRNA 表达水平,用流式细胞仪检测MDA-MB-231、MCF-7 细胞TLR5 受体的表达和定位。纯化重组鞭毛素蛋白即全长鞭毛素蛋白FliC(同时激活TLR5 和NLRC4 两条通路)、FliC驻90-97(不能激活TLR5 通路)、FliC-L3A(不能激活NLRC4 通路)、FliC驻90-97:L3A(两条通路都不激活)。用1 g/ ml 重组鞭毛素蛋白刺激MCF-7 细胞,12 h 后,ELISA 法检测IL-8 的分泌。结果:MCF-7 细胞TLR5 mRNA 表达水平最高,约是MDA-MB-435 细胞的1 700 倍,MDA-MB-231细胞TLR5 表达水平是MDA-MB-435 的约200 倍。TLR5 在MCF-7 细胞浆和胞膜上均有表达,而MDA-MB-231 细胞只在胞浆中表达。激活TLR5 通路的FliC 和FliC-L3A 能够刺激MCF-7 细胞分泌IL-8,而不激活TLR5 通路的FliC 90-97 和FliC 90-97:L3A 则不能。结论:不同乳腺癌细胞系都表达TLR5 和NLRC4,但是表达部位和表达水平不同。MCF-7 细胞TLR5 和NLRC4 表达高于其他乳腺癌细胞系。乳腺癌细胞系表面的TLR5 受体可以被鞭毛素蛋白激活,为进一步探讨TLR5 通路的激活在乳腺癌细胞增殖中的作用提供实验基础。     

MicroRNA-940在乳腺癌中的表达变化及作用机制

目的 探讨microRNA-940(miR-940)在乳腺癌组织和细胞中的表达以及对乳腺癌细胞增殖、侵袭、迁移能力的影响及其相关分子机制。 方法 实时定量聚合酶链反应（Real-time PCR）检测2016年1月~2017年1月我院手术切除的78例患者的乳腺癌组织、癌旁组织和人乳腺癌细胞系MCF-7、SK-BR-3、MDA-MB-231、BT-549及人正常乳腺细胞系MCF-10 A中miR-940的表达情况。在乳腺癌细胞系MDA-MB-231中利用脂质体LipofectaminsTM 2000转染miR-940模拟物上调miR-940的表达,CCK-8实验检测细胞增殖活性的改变,小室侵袭及迁移实验（transwell）检测细胞侵袭、迁移能力的改变。生物学信息法预测miR-940的可能作用靶基因,双荧光素酶报告实验检测miR-940与CXC趋化因子受体2 (CXCR2)的3’UTR区结合情况,Western blotting检测miR-940对CXCR2 蛋白表达的影响。 结果 miR-940在乳腺癌组织和细胞中表达明显降低（P<0.01）,并且miR-940的表达与TNM分期和淋巴结转移密切相关（P<0.01）。上调MDA-MB-231细胞miR-940表达后,细胞的增殖活性明显下降（P<0.01）,侵袭及迁移能力明显下降（P<0.01）。双荧光素酶报告显示,miR-940可与CXCR2 的3’UTR区特定序列结合显著抑制荧光素酶活性(P<0.01),上调miR-940后细胞中CXCR2 蛋白的表达均明显下降(P<0.01)。 结论 miR-940在乳腺癌中的表达降低,miR-940可以通过靶向CXCR2抑制乳腺癌细胞的增殖、侵袭及迁移能力。     

MicroRNA-204 targets JAK2 in breast cancer and induces cell apoptosis through the STAT3/BCl-2/survivin pathway

MicroRNAs (miRNAs) have emerged as important regulators that potentially play critical roles in cancer cell biological processes. Previous studies have shown that miR-204 plays an important role in various human cancers. However, the underlying mechanisms of this microRNA in breast cancer remain largely unknown. In the present study, we investigated that miR-204 expression level was markedly reduced in both the human breast cancer tissue and cultured breast cancer cell lines (MCF-7, MDA-MB-231). Overexpression of miR-204 inhibited the proliferation and promoted the apoptosis in breast cancer cells, which were reversed by co-transfection of miR-204 inhibitor. We validated that Janus kinase 2 (JAK2), as a direct target of miR-204, is overexpressed in breast cancer. Knockdown of JAK2 suppressed cell viability and induced apoptosis in breast cancer cells. Moreover, the level of miR-204 is negatively correlated with p-STAT3 and anti-apoptotic genes BCl-2 and surviving in breast cancer. In conclusions, miR-204 targets JAK2 and suppressed JAK2 and p-JAK2 expression in breast cancer, which further inhibit the activation of STAT3, BCl-2 and survivin. These findings indicate that manipulation of miR-204 expression may represent a novel therapeutic strategy in the treatment of breast cancer.     

促性腺激素释放激素类似物对乳腺癌细胞株化疗敏感性的影响

目的： 探讨促性腺激素释放激素类似物（GnRHa）对乳腺癌细胞株（MCF-7和MDA-MB-231）化疗敏感性的影响。方法：不同浓度的GnRHa（曲普瑞林,triptorelin）（10^－9 mol/L、10^－8 mol/L、10^－7 mol/L、10^－6 mol/L、10－5 mol/L）分别作用于MCF-7和MDA-MB-231细胞24 h、96 h和168 h后，用CCK-8方法检测细胞活性。用或不用GnRHa（10^－5 mol/L）处理96 h后，分别加入5-氟尿嘧啶（5-FU）或表阿霉素(EPI)作用24 h，用CCK-8法检测细胞抑制率。用RT-PCR检测GnRHa（10^－5 mol/L）作用168 h后GnRH受体、PCNA和MDR1 mRNA表达水平。结果：不同浓度GnRHa作用不同的时间后对乳腺癌细胞活性无影响。GnRHa（10^－5 mol/L）作用96 h后，5－FU和EPI对两种细胞的IC50不改变；GnRHa（10^－5 mol/L）不影响5－FU（MCF-7细胞0.5 g/L，MDA－MB－231细胞0.5 g/L）和EPI（MCF-7细胞1.2 mg/L,MDA－MB－231细胞0.8 mg/L）对两种细胞的抑制作用（P>0.05）。GnRHa（10^－5 mol/L）作用168 h后，MCF-7细胞的PCNA mRNA表达无改变。而在MDA-MB-231细胞，PCNA表达升高，差别有统计学意义（P<0.05）。在MCF-7对照组中，MDR1 mRNA有弱表达。GnRHa作用后，抑制了MDR1 mRNA表达。MDA-MB-231细胞GnRHa作用前后， MDR1 mRNA均无表达。结论：GnRHa不影响乳腺癌细胞株对5-FU和EPI的敏感性。GnRHa可能通过下调MDR1 mRNA表达水平，减弱MCF-7细胞的耐药性。     

人脂肪酸合成酶启动子在乳腺癌细胞中的转录活性分析

目的分析人脂肪酸合成酶（FAS）启动子在乳腺癌细胞中的转录活性,并与cerbB2启动子、midkine启动子相比较,为其乳腺癌靶向基因治疗提供依据。方法Western blot和间接免疫荧光法检测FAS蛋白在3种人乳腺癌细胞系SKBR3、MCF-7、MDA-MB-231以及正常成纤维细胞系NIH3T3中的表达。构建pGL3-FAS、pGL3-cerbB2和pGL3-midkine荧光素酶表达载体,并分析其在SKBR3、MCF-7、MDA-MB-231和NIH3T3细胞系中的相对转录活性。结果FAS蛋白在3种乳腺癌细胞系中均有表达,其中在SKBR3细胞中表达量最高,在MDA-MB-231细胞中表达量最低,而在正常成纤维细胞系NIH3T3中不表达。FAS蛋白主要定位于细胞质。FAS启动子在3种乳腺癌细胞系中均具有较强的转录活性,转录活性明显高于强启动子SV40和肿瘤特异性启动子midkine;而在正常成纤维细胞中,转录活性很低。FAS启动子在cerbB2高表达的SKBR3细胞中转录活性最高,与cerbB2启动子相当;在cerbB2表达较弱的MCF-7和MDA-MB-231细胞中的转录活性则明显高于cerbB2启动子。结论FAS启动子在乳腺癌细胞中具有强转录活性,较cerbB2启动子作用范围更广,较midkine启动子转录活性更高,而在正常细胞中转录活性很低,具有良好的乳腺癌靶向性,可作为乳腺癌广谱基因治疗的靶向工具。     

Effects of insulin-like growth factors I and II on oestrone sulphatase activity in human breast cancer cell lines.

Oestrogens play an important role in the development of breast cancer. A very important source of active oestrogens in the breast is oestrone sulphate which is converted to oestrone by oestrone sulphatase. The aim of this study was to assess the effects of IGF-I and IGF-II on oestrone sulphatase activity in, as well as cell growth of, MCF-7 and MDA-MB-231 human breast cancer cell lines. Cells were grown in supplemented DMEM and treated with varying concentrations of IGFs. At the end of the treatment period, intact cell monolayers were washed and assayed for oestrone sulphatase activity and the number of cell nuclei determined on a Coulter Counter. Oestrone sulphatase activity was significantly stimulated by IGF-I and II at concentrations of 100 ng/ml and 200 ng/ml in MCF-7 cells. IGF-I had no effect on oestrone sulphatase activity in MDA-MB-231 cells over the range of concentrations tested. Significant inhibition of oestrone sulphatase was observed in MDA-MB-231 cells at higher concentrations of IGF-II (50 ng/ml, 100 ng/ml and 200 ng/ml). Both IGF-I and IGF-II at higher concentrations (100 ng/ml and 200 ng/ml) significantly inhibited MCF-7 and stimulated MDA-MB-231 cell growth. Since IGF-I and II have effects on cell growth and oestrone sulphatase activity in breast cancer cell lines they may play a role in the development and progression of human breast cancer.     

Y14和Upf1在人乳腺癌细胞表达增强

目的 探讨Y14和Upf1在人乳腺癌细胞株和人乳腺癌组织表达情况及其意义。方法 应用免疫细胞化学、激光共聚焦方法测定Y14和Upf1在乳腺癌细胞株MCF-7、ZR-75-30、T47D、MDA-MB-435s、MDA-MB-453、MDA-MB-231与乳腺上皮细胞株HBL-100中的表达情况。结果 ⑴人乳腺癌细胞株中Y14和Upf1的表达均明显高于乳腺上皮细胞株（P＜0.05）。⑵在人乳腺癌细胞中,MDA-MB-231细胞株的Y14和Upf1表达明显高于MCF-7细胞（P＜0.05）。⑶Y14和Upf1在人乳腺癌组织表达增强（P＜0.05）。结论 Y14和Upf1在人乳腺癌细胞和人乳腺癌组织中的表达增强。     

ER阳性和ER阴性人乳腺癌细胞株p53,mdm—2及p21^WAF1蛋白表达…

目的 研究ＥＲ阳性和ＥＲ阴性人乳腺癌细胞株ｐ５３、ｍｄｍ－２和ｐ２１＾ＷＡＦ１蛋白的表达及其与细胞生物学特性的关系。方法 应用细胞培养、基因转染和免疫组化染色ＬＳＡＢ法等技术，检测ＥＲ阳性、表达野生型ｐ５３（ｗｔｐ５３）蛋白的ＭＣＦ－７细胞和ＥＲ阴性、表达突变型ｐ５３（ｍｔｐ５３）和ＭＤＡ－ＭＢ－２３１细胞以及ＥＲ转染阳性ＭＤＡ－ＭＢ－２３１细胞中ｐ５３、ｍｎｍ－２和ｐ２１＾ＷＡＦ１蛋白的表达水平     

Significance of mitochondrial calcium and nitric oxide for apoptosis of human breast cancer cells induced by tamoxifen and etoposide

In the present study, we tested the significance of mitochondria for apoptosis upon exposure to tamoxifen and etoposide using two human breast cancer cell lines, MCF-7 and MDA-MB-231. We showed that both tamoxifen and etoposide induced apoptosis, increased intramitochondrial calcium and nitric oxide, and decreased mitochondrial transmembrane potential in both cell lines. Both drugs increased mitochondrial protein tyrosine nitration and caused release of cytochrome c from the mitochondria of both cell lines. This study suggests that tamoxifen and etoposide utilize a common mechanism to induce apoptosis in MCF-7 and MDA-MB-231 cells.     

miR-193b体外协同增强多柔比星对乳腺癌细胞的抗肿瘤效应

目的:研究微小RNA(microRNA,miR)-193b是否能增强多柔比星对乳腺癌细胞的杀伤效力及机制。方法:用real-time PCR方法检测乳腺癌患者及健康对照者血浆中的miR-193b表达水平。MTT法检测miR-193b联合多柔比星对乳腺癌细胞系MDA-MB-231的杀伤效力。利用生物信息学、real-time PCR及Western blot方法验证miR-193b是否调节乳腺癌细胞Mcl-1的表达。构建Mcl-1真核表达载体,MTT法检测Mcl-1表达载体转染对miR-193b联合多柔比星治疗乳腺癌疗效的影响。结果:乳腺癌患者血浆中miR-193b表达水平显著低于对照组。miR-193b联合多柔比星治疗组对MDA-MB-231细胞的杀伤效力显著高于多柔比星单治疗组。miR-193b转染后,MDA-MB-231细胞Mcl-1的mRNA及蛋白表达水平均下降。miR-193b联合多柔比星在Mcl-1表达载体转染后对MDA-MB-231细胞的杀伤活性显著低于未转染Mcl-1表达载体的miR-193b联合多柔比星组。结论:miR-193b通过靶向于Mcl-1增强多柔比星对乳腺癌细胞的杀伤效力。     

NGF对乳腺癌细胞系MDA-MB-231和MCF-7增殖和存活的影响

目的:研究神经生长因子(NGF)对乳腺癌细胞系MDA-MB-231和MCF-7细胞增殖与存活的影响。方法:运用免疫荧光方法检测NGF及其受体酪氨酸蛋白激酶A(TrkA)的表达;运用酶联免疫吸附测定(ELISA)方法检测细胞的NGF自分泌情况;运用蛋白质印迹(Western blotting)方法检测TrkA蛋白的表达情况;运用NGF阻断剂Ro 08-2750对细胞进行NGF剥夺,通过单核细胞直接细胞毒性测定法(MTT)检测细胞增殖的情况;运用流式细胞仪检测细胞凋亡情况以及细胞周期分布的变化。结果:2株乳腺癌细胞系均表达NGF及其受体TrkA,NGF阻断剂Ro 08-2750能够明显抑制2种细胞的增殖,并具有剂量依赖性;流式细胞仪显示Ro 08-2750处理的MDA-MB-231细胞和MCF-7细胞的S期细胞比例明显增加,G2/M期细胞比例明显降低,MDA-MB-231细胞出现凋亡峰。结论:NGF剥夺明显抑制乳腺癌细胞系MDA-MB-231和MCF-7的增殖,并引起MDA-MB-231细胞凋亡。     

Isolation of broadly reactive, tumor-specific, HLA Class-I restricted CTL from blood lymphocytes of a breast cancer patient

Blood lymphocytes of a HLA-A2 positive breast cancer patient were stimulated with either MCF-7 or MDA-MB-231, i.e., HLA-A2-matched allogeneic breast carcinoma cell lines. Several CD8⁺ CTL clones with reactivity against the stimulator cells but not against K562 were generated. Reactivity could be blocked with monoclonal antibody (mAb) W6/32, MA2.1, and/or BB7.2, indicating that the clones are HLA-class I and HLA-A2 restricted. The CTL clones generated following stimulation with MCF-7, recognized various other allogeneic HLA-A2⁺ tumor cell lines, including breast carcinoma, renal cell carcinoma, and melanoma cell lines, but not HLA-A2⁻ tumor cell lines. The CTL clones did not recognize normal HLA-A2⁺ cells including breast epithelial cells, renal proximal tubular epithelial cells (PTEC), or EBV-transformed B cells including the autologous EBV cell line. In contrast to the CTL clones induced with MCF-7, the reactivity of the clones stimulated with MDA-MB-231, was limited to the stimulator cell MDA-MB-231. Cytotoxicity assays utilizing T2 cells loaded with peptides as target cells indicated that none of the examined CTL-epitopes derived from HER-2/neu, Muc-1, Ep-CAM-1, and p53 were recognized by the CTL clones generated. Our findings underscore that breast cancer is an immunogenic tumor and that HLA-class I-matched allogeneic tumor cells can be used as stimulator cells to generate tumor-specific CTL from peripheral blood of a breast cancer patient with specificity for an antigenic determinant that is broadly expressed on tumor cells from various origins or with specificity limited to the breast cancer stimulator cell.     

Peripheral-type benzodiazepine receptor (PBR) gene amplification in MDA-MB-231 aggressive breast cancer cells

Recent studies using human breast cancer cell lines, animal models, and human tissue biopsies have suggested a close correlation between the expression of the peripheral-type benzodiazepine receptor (PBR) and the progression of breast cancer. This study investigates the genetic status of the PBR gene in two human breast cancer cell lines: MDA-MB-231 cells, which are an aggressive breast cancer cell line that contains high levels of PBR, and MCF-7 cells, which are a nonaggressive cell line that contains low levels of PBR. Both DNA (Southern) blot and fluorescence in situ hybridization analyses indicate that the PBR gene is amplified in MDA-MB-231 relative to MCF-7 cells. These data suggest that PBR gene amplification may be an important indicator of breast cancer progression.     

Sensitivity of flow cytometric assay for measurement of human intracellular heat shock protein 27

Increased expression of heat shock protein 27 (hsp27) is related to enhanced resistance of breast tumor cells to cytotoxic drugs and radiation therapy. Therefore, development of a rapid and sensitive method for detection of hsp27 may be useful for correlating tumor cell expression of hsp27 to breast cancer patients' clinical outcome. We have simultaneously assessed hsp27 levels in three different human cell lines (MCF-7, MDA-MB-231, and Jurkat) by both Western blotting and flow cytometry. MCF-7 hsp27 levels were consistently detected at higher levels, while MDA-MB-231 hsp27 levels were detected at very low levels when immunoblotting was performed. Hsp27 was not detected in Jurkat cells by immunoblotting. In contrast, hsp27 levels were detected by flow cytometry in all the cell lines, indicating a better sensitivity of this method. Although hsp27 was expressed in almost equal percentage of MCF-7 (93+/-3.4%), MDA-MB-231 (97+/-1%), and Jurkat (95.5+/-1.9) cells, the fluorescence intensity of intracellular hsp27 protein was significantly lower in MDA-MB-231 and Jurkat cells as compared to MCF-7 cells. The flow cytometry data further demonstrated that reduced hsp27 expression in both MDA-MB-231 and Jurkat cells was not due to a lack of hsp27 expression in a subset of cells, but rather due to reduced expression of hsp27 in all individual cells.     

MiR-146a调节TRAIL不敏感的乳腺癌细胞迁移及其分子机制

目的 研究miR-146a及其靶基因EGFR对乳腺癌细胞迁移的影响.方法 用终浓度为50、100、200和500 μg/L的重组可溶性TRAIL(rsTRAIL)持续刺激对TRAIL敏感的MDA-MB-231细胞4周,筛选得到TRAIL不敏感的乳腺癌细胞MDA-MB-231/TR.RT-PCR检测miR-146a的表达;Transwell实验以及划痕实验检测乳腺癌细胞的迁移能力;双荧光素酶报告基因分析以及Western blot鉴定MDA-MB-231/TR细胞中miR-146a与EGFR基因的靶向调控关系;Western blot检测DR4、DR5、IRAK1、CXCR4、p-IκBα、IκBα、caspase 8和caspase 3的蛋白表达水平;染色质免疫共沉淀技术(ChIP)分析MDA-MB-231和MDA-MB-231/TR细胞中NF-κB P65亚基与miR-146a启动子区的结合情况.结果 TRAIL细胞毒作用不敏感的人乳腺癌细胞系MDA-MB-231/TR中miR-146a的表达降低,并引起其靶基因EGFR的表达增加,最终导致TRAIL不敏感的乳腺癌细胞迁移能力增强.同时发现NF-κB参与miR-146a低表达的调控.结论 miR-146a对TRAIL不敏感的乳腺癌细胞迁移起重要的调节作用.     

miR-125a-5p通过GSK-3β/Snail信号通路抑制乳腺癌细胞的上皮-间充质转化

目的:探讨微小RNA-125a-5p(miR-125a-5p)通过GSK-3β/Snail信号通路对乳腺癌细胞上皮-间充质转化(EMT)的影响。方法:RT-qPCR检测人正常乳腺上皮细胞与乳腺癌细胞中miR-125a-5p的表达量,同时检测miR-125a-5p质粒在人乳腺癌MDA-MB-231细胞中的转染效率;趋化运动实验与Transwell侵袭实验检测趋化运动能力和侵袭能力;Western blot检测EMT相关标志物的变化,同时检测磷酸化糖原合成酶激酶3β(p-GSK-3β)的蛋白水平及Snail的转核情况。结果:乳腺癌细胞中miR-125a-5p的表达量明显低于人正常乳腺上皮细胞(P0.05);miR-125a-5p在转染miR-125a-5p质粒的MDA-MB-231细胞中表达水平明显增高;MDA-MB-231细胞的趋化运动能力在表皮生长因子(EGF)浓度为10μg/L时最强;在EGF刺激下,与MDA-MB-231/NC细胞组相比,MDAMB-231/miR-125a-5p细胞组的侵袭能力明显降低,上皮钙黏着蛋白(E-cadherin)表达量升高,波形蛋白(vimentin)和p-GSK-3β的蛋白水平明显降低,同时Snail转核受到明显抑制;与MDA-MB-231/miR-125a-5p+Con细胞组相比,MDA-MB-231/miR-125a-5p+GAB2细胞组的侵袭能力明显增强,E-cadherin表达量降低,vimentin和p-GSK-3β的蛋白水平明显升高,同时促进Snail转核。结论:miR-125a-5p可通过GSK-3β/Snail信号通路抑制乳腺癌细胞的EMT,进而抑制乳腺癌细胞的侵袭能力。