HIF-1α通过下调TP53INP1促进乳腺癌细胞的迁移及侵袭

目的:探讨HIF-1α通过调节TP53INP1蛋白对乳腺癌细胞迁移及侵袭能力的影响。方法:通过免疫组化检测60例乳腺癌标本中TP53INP1和HIF-1α的表达情况及分析其临床病理资料。通过体外构建HIF-1α及共转染HIF-1α和TP53INP1细胞模型,迁移侵袭实验和划痕实验检测HIF-1α和TP53INP1对乳腺癌细胞迁移侵袭能力的影响;Western blot实验研究共同下调HIF-1α和 TP53INP1对MMP2、VEGF蛋白表达水平的影响。结果:免疫组化实验显示HIF-1α在人乳腺癌组织中高表达,TP53INP1呈低表达,两者之间具有相关性且均与淋巴结转移有关（P＜0.05）。迁移侵袭实验及划痕实验显示在乳腺癌MDA-MB-231细胞和MCF-7细胞中下调HIF-1α抑制了迁移侵袭及愈合能力,MCF-7细胞中共同转染下调HIF-1α和TP53INP1质粒之后逆转了乳腺癌细胞的迁移侵袭能力及愈合能力（P＜0.05）。Western blot实验显示shHIF-1α和TP53INP1共转染后在MDA-MB-231细胞中MMP2表达水平高于下调HIF-1α表达组。共转染shHIF-1α和shTP53INP1质粒后在MCF-7细胞中,VEGF和MMP2表达高于下调shHIF-1α组（P＜0.05）。结论:HIF-1α可能通过下调TP53INP1的表达促进乳腺癌细胞的迁移侵袭能力。     

PPAPDC1A在体内外对乳腺癌细胞增殖、侵袭和转移能力的影响

目的:通过构建稳定过表达和干扰PPAPDC1A的乳腺癌细胞株,探讨PPAPDC1A对乳腺癌细胞增殖、侵袭和转移能力的影响。方法:利用CCK-8和Transwell实验检测PPAPDC1A稳定过表达和干扰后对乳腺癌细胞体外增殖和侵袭能力的影响。采用裸鼠皮下成瘤实验检测PPAPDC1A对乳腺癌细胞体内增殖和裸鼠致瘤性的作用。利用免疫组织化学染色法检测各组肿瘤组织中Ki-67的表达。通过裸鼠尾静脉注射实验检测PPAPDC1A对乳腺癌MCF-7细胞和MDA-MB-231细胞体内转移能力的影响。结果:成功建立稳定过表达PPAPDC1A的乳腺癌MCF-7细胞株和稳定干扰PPAPDC1A的乳腺癌MDA-MB-231细胞株;CCK-8和Transwell实验结果显示,与MCF-7和MCF-7-Vector细胞株相比,MCF-7-PPAPDC1A细胞株的生长速度显著增快,穿膜细胞数量多（P＜0.05）;与此相反,MDA-MB-231-shPPAPDC1A组细胞的生长速度和穿膜细胞数明显少于MDA-MB-231-shNC和MDA-MB-231 细胞株（P＜0.05）。动物实验结果显示,与MCF-7-Vector组相比,MCF-7-PPAPDC1A组的肿瘤生长速度较快,肿瘤的体积较大,Ki-67的阳性率高,肺转移灶的数目增多（P＜0.05）;与此相反,与MDA-MB-231-shNC组相比MDA-MB-231-shPPAPDC1A组的肿瘤生长速度较慢,肿瘤的体积较小,Ki-67的阳性率低,肺转移灶的数目减少（P＜0.05）。结论:PPAPDC1A对乳腺癌细胞的增殖、侵袭和转移有促进作用。     

Tspan29在乳腺癌组织中的表达及其对MCF-7和MDA-MB-231细胞恶性生物学行为的影响

目的：检测4次穿膜蛋白29（tetraspanins-29，Tspan29）在乳腺癌组织和细胞系中的表达水平，探讨敲低Tspan29对乳腺癌MCF-7和MDA-MB-231细胞增殖、迁移、侵袭及上皮间质转化（epithelieal-mesenchymal transition，EMT）的影响。方法：收 集2017年6月至2018年2月复旦大学附属肿瘤医院闵行分院手术切除的20例乳腺癌患者的癌组织和相应的癌旁组织标本，以及乳腺癌细胞系 MCF-7、MDA-MB-231 和人乳腺上皮细胞 MDA-kb2，用 qPCR 和 Western blotting 检测乳腺癌组织和细胞系中Tspan29 的表达水平。通过 siTspan29 对 MCF-7、MDA-MB-231 细胞中 Tspan29 进行干扰，用 qPCR 法检测转染细胞中 Tspan29mRNA 和蛋白的表达水平，PCR 芯片法检测 MCF-7 细胞中 EMT 相关基因的表达，用 CCK-8 法、Transwell 实验检测 MCF-7 和MDA-MB-231细胞的增殖、迁移和侵袭能力。结果：乳腺癌组织中Tspan29 mRNA和蛋白的表达水平显著高于癌旁组织（均 P<0.01），MCF-7和MDA-MB-231细胞中Tspan29 mRNA和蛋白的表达水平显著高于MDA-kb2细胞（均P<0.01）。siTspan29干扰后，MCF-7细胞中Tspan29 mRNA和蛋白的表达水平显著下降（均P<0.05）；MCF-7细胞中EMT相关基因中有2个基因显著上调， 有7个基因显著下调；MCF-7和MDA-MB-231细胞的增殖、迁移及侵袭能力显著下降（均P<0.05）。结论：Tspan29在乳腺癌组织及细胞系中表达水平显著上调，敲低Tspan29对乳腺癌细胞的增殖、迁移和侵袭有显著的抑制作用。     

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。     

CD4+CD25+调节性T 细胞对乳腺癌细胞上皮间质转化和ALDH1+干样细胞的影响*

目的:研究CD4+CD25+调节性T 细胞（regulatory T cells ,Tregs）对乳腺癌细胞上皮间质转化（epithelial-mesenchymal transition ,EMT ）、细胞迁移侵袭能力,及ALDH1+干样细胞比例的影响。方法:采用免疫磁珠法分离乳腺癌患者外周血中CD4+CD25+Tregs,CD4+CD25+Tregs与乳腺癌BT474、MCF-7 细胞系共培养（共培养组）,BT474、MCF-7 单独培养（对照组）。 检测共培养组和对照组乳腺癌细胞EMT 相关标志物表达的变化,及细胞迁移和侵袭能力的变化。此外,检测BT474 细胞中ALDH1+干样细胞、微球形成能力和自我更新能力的变化。结果:CD4+CD25+Tregs诱导BT474 和MCF-7 细胞间质性标志物表达增高,诱导MCF-7 细胞上皮性标志物E-cadherin 表达降低。CD4+CD25+Tregs诱导BT474 和MCF-7 细胞迁移和侵袭能力上调。共培养组BT474 细胞中ALDH1+干样细胞比例、微球体形成能力、自我更新能力较对照组增强。结论:CD4+CD25+Tregs可诱导乳腺癌细胞发生EMT ,增强细胞体外迁移和侵袭能力,同时促进ALDH1+干样细胞增加。      

miRNA-34a抑制乳腺癌细胞MCF-7、MDA-MB-231的增殖与侵袭

目的:研究miRNA-34a(miR-34a)对乳腺癌细胞MCF-7、MDA-MB-231的生物调控作用。方法:采用定量PCR检测人乳腺上皮细胞MCF-10A,乳腺癌细胞株MCF-7、T47D、MDA-MB-231、MDA-MB-453、Hs578T中miR-34a的表达水平。通过miR-34a mimics分别上调MCF-7、MDA-MB-231细胞中miR-34a的表达水平,MTT和Transwell检测肿瘤细胞增殖能力、侵袭力等生物学行为的变化。结果:乳腺癌细胞MCF-7、T47D、MDA-MB-231、MDA-MB-453、Hs578T中miR-34a处于低表达水平。通过miR-34a mimics上调MCF-7、MDA-MB-231细胞中miR-34a的表达后,细胞的增殖能力被miR-34a抑制（P＜0.05）,miR-34a对细胞侵袭有显著抑制作用（P＜0.05）。结论:miR－34a在乳腺癌细胞MCF-7、T47D、MDA-MB-231、MDA-MB-453及Hs578T中低表达,miR-34a抑制乳腺癌细胞MCF-7、MDA-MB-231的细胞增殖和侵袭能力。     

HIF-1α靶向SP1促进食管鳞状细胞癌转移及血管生成的机制研究

目的:探究HIF-1α对食管鳞状细胞癌转移及血管生成的作用及其可能的机制。方法:RT-PCR检测细胞HIF-1α和SP1 mRNA表达;Western blot检测细胞HIF-1α和SP1蛋白表达;CCK-8检测细胞活力;Transwell实验检测细胞迁移和侵袭;体外血管生成实验检测人脐静脉血管内皮细胞HUVEC血管形成能力;ChIP-PCR实验检测HIF-1α和SP1启动子的结合。结果:与人食管上皮细胞HEEC相比,在食管鳞状细胞癌细胞Ec109、KYSE30、KYSE150和KYSE410中HIF-1α和SP1 mRNA和蛋白表达显著上调（P＜0.05）,其中Ec109细胞变化最为明显。与sh-NC组相比,sh-HIF-1α组Ec109细胞活力、迁移和侵袭能力、HUVEC细胞管道数目显著下调（P＜0.05）;与oe-NC组相比,oe-HIF-1α组Ec109细胞活力、迁移和侵袭能力、HUVEC细胞管道数目显著上调（P＜0.05）。HIF-1α靶向结合SP1启动子区。与sh-NC组相比,sh-HIF-1α组Ec109细胞SP1 mRNA和蛋白表达、细胞活力、迁移和侵袭能力、HUVEC细胞管道数目显著下调（P＜0.05）;与sh-HIF-1α+oe-NC组相比,sh-HIF-1α+oe-SP1组Ec109细胞SP1 mRNA和蛋白表达、细胞活力、迁移和侵袭能力、HUVEC细胞管道数目显著上调（P＜0.05）。结论:HIF-1α通过靶向SP1促进食管鳞状细胞癌转移及血管生成。     

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、SK-BR-3、T-47D中FSIP1的表达水平均显著升高(P＜0.01);与癌旁乳腺组织相比,乳腺癌组织中FSIP1的表达水平显著升高(P＜0.01);生存分析结果显示,FSIP1表达水平较高的乳腺癌患者总生存期显著缩短(P＜0.001),且FSIP1的表达水平与乳腺癌患者的临床分期(P=0.006)及细胞增殖标记物Ki-67(P=0.0067)表达相关;迁移实验和侵袭实验结果显示,敲除FSIP1基因后乳腺癌细胞系MDA-MB-231和SK-BR-3的迁移和侵袭能力显著降低(P＜0.01)。结论 FSIP1在乳腺癌细胞中高表达能够增强其迁移和侵袭能力,并与患者预后不良相关。     

长链非编码RNA ARHGAP5-AS1抑制乳腺癌细胞的增殖、迁移和侵袭

目的：检测长链非编码RNA（long non-coding RNA，lncRNA）ARHGAP5-AS1在乳腺癌组织及细胞中的表达，分析其表达与患者临床病理参数及预后的相关性，并初步探讨其对乳腺癌细胞体外增殖、迁移和侵袭的影响。方法：通过对TCGA数据库中乳腺癌相关数据集的生物信息学分析，筛选出在乳腺癌中低表达且与患者不良预后相关的lncRNA ARHGAP5-AS1，采用qPCR 方法在江南大学附属医院肿瘤科从 2010 年 4 月至 2016 年 10 月收集的乳腺癌组织中验证其表达。采用 χ2检验分析ARHGAP5-AS1表达与乳腺癌患者临床病理参数之间的关系，Kaplan-Meier生存分析构建生存曲线，比较高、低表达组的总生存期和无复发生存期。CCK-8 实验、划痕实验和 Transwell 实验分别检测 ARHGAP5-AS1 敲低对乳腺癌细胞MDA-MB-231和BT-549的增殖、迁移和侵袭的影响。结果：TCGA 数据库分析结果显示，ARHGAP5-AS1 在乳腺癌组织中的表达水平显著低于正常乳腺组织（P<0.01），其低表达与较大肿瘤直径（T3）、远处转移（M1）、ER 和 PR 阴性以及较短的总生存期显著相关（均P<0.05）。乳腺癌组织中ARHGAP5-AS1表达水平显著低于癌旁组织（P<0.05），其低表达与较大的肿瘤直径和淋巴结转移相关（均 P<0.05）。同样，ARHGAP5-AS1 在 6 株人乳腺癌细胞系（MDA-MB-231、BT-549、MDA-MB-468、MCF-7、HCC1937、Hs578T）中的表达水平也显著低于正常乳腺上皮细胞系（MCF-10A）（均P<0.05）。细胞功能实验显示，ARHGAP5-AS1敲低促进MDA-MB-231和BT-549细胞的增殖、迁移和侵袭（均P<0.05）。结论：ARHGAP5-AS1异常低表达可能通过促进乳腺癌细胞的增殖、迁移和侵袭影响乳腺癌的发生发展。     

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。     

Stemness marker ALDH1A1 promotes tumor angiogenesis via retinoic acid/HIF-1α/VEGF signalling in MCF-7 breast cancer cells

Background

Aldehyde dehydrogenase 1A1 (ALDH1A1), a member of aldehyde dehydrogenase family, is a marker of stemness in breast cancer. During tumor progression cancer stem cells (CSCs) have been reported to secrete angiogenic factors to orchestrate the formation of pathological angiogenesis. This vasculature can represent the source of self-renewal of CSCs and the route for further tumor spreading. The aim of the present study has been to assess whether ALDH1A1 controls the output of angiogenic factors in breast cancer cells and regulates tumor angiogenesis in a panel of in vitro and in vivo models.

Methods

Stemness status of breast cancer cells was evaluated by the ability to form turmorspheres in vitro. A transwell system was used to assess the angiogenic features of human umbilical vein endothelial cells (HUVEC) when co-cultured with breast cancer cells MCF-7 harboring different levels of ALDH1A1. Under these conditions, we survey endothelial proliferation, migration, tube formation and permeability. Moreover, in vivo, MCF-7 xenografts in immunodeficient mice allow to evaluate blood flow, expression of angiogenic factors and microvascular density (MVD).

Results

In MCF-7 we observed that ALDH1A1 activity conferred stemness property and its expression correlated with an activation of angiogenic factors. In particular we observed a significant upregulation of hypoxia inducible factor-1α (HIF-1α) and proangiogenic factors, such as vascular endothelial growth factor (VEGF). High levels of ALDH1A1, through the retinoic acid pathway, were significantly associated with VEGF-mediated angiogenesis in vitro. Co-culture of HUVEC with ALDH1A1 expressing tumor cells promoted endothelial proliferation, migration, tube formation and permeability. Conversely, downregulation of ALDH1A1 in MCF-7 resulted in reduction of proangiogenic factor release/expression and impaired HUVEC angiogenic functions. In vivo, when subcutaneously implanted in immunodeficient mice, ALDH1A1 overexpressing breast tumor cells displayed a higher expression of VEGF and MVD.

Conclusion

In breast tumors, ALDH1A1 expression primes a permissive microenvironment by promoting tumor angiogenesis via retinoic acid dependent mechanism. In conclusion, ALDH1A1 might be associated to progression and diffusion of breast cancer.

     

Claudin-4 is required for vasculogenic mimicry formation in human breast cancer cells

Vasculogenic mimicry (VM) refers to the unique capability of aggressive tumor cells to mimic the pattern of embryonic vasculogenic networks. Claudins are aberrantly expressed in aggressive breast cancer. However, the relationship between claudins and VM formation is not clear. We examined VM in two human breast cancer cell lines with different aggressive capabilities (MDA-MB-231 and MCF-7 cells) and one human umbilical vein endothelial cell line (HUVEC). Both HUVEC and MDA-MB-231 cells formed vascular channels in Matrigel cultures, while MCF-7 cells did not. Western blot analysis revealed a possible correlation between claudin-4 and -6 expression in breast cancer cell lines and tumor aggressiveness, with protein levels correlating with the ability to form vascular channels. Treatment of MDA-MB-231 and HUVEC cells with claudin-4 monoclonal antibodies completely inhibited the ability of cells to form vascular channels. Moreover, knockdown of claudin-4 by short hairpin RNA completely inhibited tubule formation in MDA-MB-231 cells. Overexpression of claudin-4 in MCF-7 cells induced formation of vascular channels. Immunocytochemistry revealed that membranous claudin-4 protein was significantly associated with vascular channel formation. Collectively, these results indicate that claudin-4 may play a critical role in VM in human breast cancer cells, opening new opportunities to improve aggressive breast cancer therapy.     

Effects of oestradiol and tamoxifen on VEGF, soluble VEGFR-1, and VEGFR-2 in breast cancer and endothelial cells

Angiogenesis is regulated by the balance between pro- and antiangiogenic factors. Vascular endothelial growth factor (VEGF), acting via the receptors VEGFR-1 and VEGFR-2, is a key mediator of tumour angiogenesis. The soluble form of the VEGF receptor-1 (sVEGFR-1) is an important negative regulator of VEGF-mediated angiogenesis. The majority of breast cancers are oestrogen dependent, but it is not fully understood how oestrogen and the antioestrogen, tamoxifen, affect the balance of angiogenic factors. Angiogenesis is a result of the interplay between cancer and endothelial cells, and sex steroids may exert effects on both cell types. In this study we show that oestradiol decreased secreted sVEGFR-1, increased secreted VEGF, and decreased the ratio of sVEGFR-1/VEGF in MCF-7 human breast cancer cells. The addition of tamoxifen opposed these effects. Moreover, human umbilical vein endothelial cells (HUVEC) incubated with supernatants from oestradiol-treated MCF-7 cells exhibited higher VEGFR-2 levels than controls. In vivo, MCF-7 tumours from oestradiol+tamoxifen-treated nude mice exhibited decreased tumour vasculature. Our results suggest that tamoxifen and oestradiol exert dual effects on the angiogenic environment in breast cancer by regulating cancer cell-secreted angiogenic ligands such as VEGF and sVEGFR-1 and by affecting VEGFR-2 expression of endothelial cells.     

Upregulated hsa_circ_0000129 expression promotes proliferation and migration of breast cancer cells

Circular RNAs (circRNAs) are considered potential biomarkers in the pathogenesis and detection of several types of cancer. The present study aimed to investigate the role of hsa_circ_0000129 in the pathogenesis and molecular mechanism underlying breast cancer. A total of 68 pairs of breast cancer and corresponding paracancerous tissue samples, three different breast cancer cell lines (MCF-7, MDA-MB-231 and MDA-MB-468) and a normal human breast cell line (MCF-10A) were used to investigate the expression of hsa_circ_0000129. The effect of hsa_circ_0000129 on cell proliferation, migration and colony formation was assessed in MCF-7 and MDA-MB-468 cells, along with the expression of enhancer of zeste homolog 2 (EZH2). The results demonstrated that hsa_circ_0000129 expression was significantly higher in breast cancer tissues compared with normal tissues. In addition, high hsa_circ_0000129 expression was significantly associated with lymph node metastasis and a higher tumor-node-metastasis stage. Comparisons between the breast cancer cell lines (MCF-7, MDA-MB-231 and MDA-MB-468) and MCF-10A cells indicated similar results. MCF-7 cells overexpressed with hsa_circ_0000129 significantly increased cell proliferation, migration and colony formation compared with the negative control group, the effects of which were reversed following hsa_circ_0000129 knockdown in MDA-MB-468 cells. Furthermore, EZH2 expression was positively associated with hsa_circ_0000129 expression. Taken together, the results of the present study suggest that hsa_circ_0000129 may represent a promising prognostic biomarker for breast cancer. In addition, the role of hsa_circ_0000129 in breast cancer cell lines indicates a mechanism for tumorigenesis, as well as a potent target for the treatment of malignant progression.     

AEG-1基因促进乳腺癌细胞株MCF-7转移

目的 观察AEG-1基因在细胞水平对乳腺癌细胞MCF-7转移的影响。方法 通过将siRNA转染进MCF-7细胞,沉默细胞中AEG-1表达量,以转染阴性siRNA作为对照组。分别采用Transwell小室检测细胞迁移侵袭能力、CCK8实验检测细胞增殖能力。同时通过检测细胞中VEGF的变化及HUVEC细胞体外管腔形成实验考察AEG-1对于血管新生的影响。结果 沉默AEG-1,MCF-7细胞的迁移能力、侵袭能力和增殖能力明显受到抑制。沉默AEG-1,MCF-7细胞的VEGF表达明显降低。上清处理HUVEC细胞,沉默AEG-1组的血管新生能力明显受到抑制。结论 沉默AEG-1基因能显著抑制MCF-7细胞转移的多个层面,包括细胞迁移、侵袭、增殖以及血管新生。表明AEG-1基因在乳腺癌转移过程中起着重要作用,也为将来乳腺癌治疗开拓了新思路。