毛蕊异黄酮对人乳腺癌MCF-7细胞作用的体外研究

目的:观察毛蕊异黄酮在体外对雌激素受体阳性细胞人乳腺癌MCF-7细胞的作用及其机制。方法:用不同浓度毛蕊异黄酮作用MCF-7细胞,并设未处理阴性对照组及17-雌二醇(17-estradiol,E2)阳性对照组。MTT法测定细胞增殖抑制的情况,FCM检测细胞凋亡率影响,并通过RT-PCR和免疫细胞化学法分别测定细胞中Bcl-2、Bax的mRNA和蛋白水平变化。结果:低浓度的毛蕊异黄酮(2、4和8μmol/L)促进MCF-7细胞增殖,而高浓度毛蕊异黄酮(16和32μmol/L)抑制MCF-7细胞增殖,并且呈剂量依赖性。同时,低浓度的毛蕊异黄酮能减少MCF-7细胞凋亡率(P<0.05),并且显著降低Bax表达水平,增加Bcl-2表达水平(P<0.05)。结论:毛蕊异黄酮在低浓度时能促进MCF-7细胞增殖,减少细胞凋亡,其机制可能与毛蕊异黄酮的雌激素作用有关。     

Pannexin1通道对乳腺癌细胞MCF-7细胞增殖和侵袭迁移的影响及可能机制

摘 要：［目的］ 探究Pannexin1对乳腺癌细胞MCF-7增殖、侵袭迁移的影响及可能机制。［方法］ MTT法检测0、12.5、25、50、100、200μmol/L甘珀酸（CBX）对乳腺癌细胞MCF-7增殖能力的影响;集落克隆检测CBX对乳腺癌细胞MCF-7增殖能力的影响;采用实时荧光法检测细胞间荧光传递能力;化学发光法检测细胞外ATP浓度。使用100μmol/LCBX处理乳腺癌细胞MCF-7后,Transwell法检测MCF-7细胞的侵袭迁移能力;Western 印迹法检测乳腺癌细胞中相关蛋白p-ERK1/2、ERK1/2、Vimentin、MMP-9蛋白的表达。［结果］ MTT实验结果表明,200μmol/L CBX可显著性抑制MCF-7细胞增殖能力（P<0.05）,而100μmol/L CBX对MCF-7细胞增殖能力无显著性抑制作用（P>0.05）。集落克隆实验结果表明,200 μmol/L CBX可显著性抑制MCF-7细胞增殖能力（P<0.05）。实时荧光法和化学发光法实验结果表明,100μmol/L和200μmol/L CBX显著性抑制Pannexin1通道功能（P<0.05）;Transwell实验和划痕实验结果表明,100μmol/L CBX显著性抑制乳腺癌MCF-7细胞侵袭迁移能力（P<0.05）;Western印迹法结果表明,CBX抑制Pannexin1后,乳腺癌细胞MCF-7中ERK1/2、p-ERK1/2、MMP-9和Vimentin蛋白表达量下降（P<0.05）。［结论］ 200μmol/L CBX抑制Pannexin1通道后,乳腺癌MCF-7细胞活性和增殖能力减弱,而100μmol/L CBX可降低乳腺癌MCF-7细胞侵袭迁移能力,其机制可能与ERK1/2表达量下降有关。     

叶黄素对人前列腺癌PC3细胞增殖和凋亡影响的机制

目的 探究叶黄素对人前列腺癌PC3细胞增殖和凋亡影响的作用机制,为前列腺癌预防及治疗提供新的理论依据。方法 不同浓度叶黄素作用于PC3细胞,CCK8法检测细胞增殖情况;流式细胞仪检测细胞周期分布和凋亡变化;细胞划痕和Transwell实验观察细胞迁移和侵袭能力;RT-PCR和Western blot技术检测细胞中Bax、Bcl-2的mRNA水平和蛋白表达。结果 叶黄素显著抑制PC3细胞的增殖,并呈时间和浓度依赖性。叶黄素可以将细胞生长阻滞在G0/G1期,抑制细胞迁移和侵袭;还可促进细胞凋亡,使Bcl-2表达下降,Bax表达上升。叶黄素可在转录水平上下调Bcl-2 mRNA和上调BaxmRNA。结论 叶黄素抑制PC3细胞增殖并促进其凋亡,其机制可能与阻滞细胞周期、抑制细胞迁移、侵袭以及调节凋亡相关基因和蛋白表达有关。     

TNF-ɑ调控LRG1促进乳腺癌MCF-7细胞增殖、侵袭和迁移

目的:研究TNF-α对乳腺癌MCF-7细胞中LRG1蛋白表达的调控及其对乳腺癌MCF-7细胞增殖、侵袭和迁移能力的影响及相关分子机制。方法:MTT实验检测不同浓度TNF-α处理后MCF-7细胞活力;EdU实验、Transwell实验和划痕实验分别检测抑制LRG1表达后细胞增殖、侵袭以及迁移能力;Western blot检测细胞内MAPK信号通路中p-p38蛋白表达。结果:低浓度TNF-α处理乳腺癌MCF-7细胞,细胞活力增强;抑制LRG1表达后细胞增殖能力下降,侵袭细胞数、细胞迁移率以及p-p38蛋白表达均下降。结论:TNF-ɑ通过调控LRG1的表达促进乳腺癌MCF-7细胞增殖、侵袭和迁移,这一过程可能通过激活p38MAPK信号通路来实现。     

LINC01936在乳腺癌中的表达及其对细胞增殖、凋亡、迁移和侵袭特性的影响

摘 要：［目的］ 研究LINC01936在乳腺癌中的表达及其对细胞增殖、凋亡、迁移和侵袭的影响。［方法］ 从UCSC XENA数据库中获取LINC01936在1 099例乳腺癌组织和292例非配对癌旁组织及112例配对样本中的表达数据。用LINC01936-pcDNA3.1或pcDNA3.1质粒转染人乳腺癌MCF-7细胞,获得过表达LINC01936的MCF-7细胞和对照 MCF-7细胞。使用cell counting kit-8(CCK-8) 细胞增殖实验测定LINC01936对MCF-7细胞增殖的影响。采用Transwell实验和细胞划痕实验测定细胞迁移和侵袭能力。通过细胞黏附实验检测黏附能力。荧光Hoechst33342染色法用于评价LINC01936对细胞凋亡的影响。Western blot和免疫荧光法用于检测NF-κB的蛋白水平。［结果］ 生物信息学分析表明,LINC01936在乳腺癌组织中低表达。CCK-8检测显示,LINC01936抑制MCF-7细胞的增殖（P<0.05）。Transwell实验及细胞划痕实验表明,转染LINC01936过表达质粒后,MCF-7细胞迁移和侵袭能力下降。细胞黏附实验表明,LINC01936减弱乳腺癌细胞的黏附能力（P<0.05）。荧光染色分析表明,LINC01936过表达促进MCF-7细胞的凋亡。Western blot和免疫荧光显示,LINC01936促进NF-κB的表达。［结论］ LINC01936可能通过促进NF-κB的表达来抑制乳腺癌细胞的增殖、迁移和侵袭,并促进细胞凋亡。     

FBXW7过表达可抑制乳腺癌MCF-7细胞增殖和迁移并促进细胞凋亡

目的:探讨F框/WD-40域蛋白7(F-box and WD-40 domain protein 7,FBXW 7)基因过表达对乳腺癌MCF-7细胞增殖、迁移、周期和凋亡的影响。方法:构建FBXW 7过表达的重组载体pEZ-M02-FBXW7质粒,并将其转染乳腺癌MCF-7细胞,应用实时荧光定量PCR和蛋白质印迹法检测pEZ-M02-FBXW7转染后MCF-7细胞中FBXW7 mRNA和蛋白的表达,CCK-8和Transwell法检测细胞增殖、迁移和侵袭情况,FCM法检测细胞周期和细胞凋亡情况。结果:pEZ-M02-FBXW7转染后,乳腺癌MCF-7细胞中FBXW7 mRNA和蛋白的表达水平高于阴性对照组(将空载体pEZ-M02质粒转染至MCF-7细胞)和空白对照组(未进行转染的MCF-7细胞)(P值均<0.01),MCF-7细胞的增殖、迁移和侵袭能力均明显下降(P值均<0.05),MCF-7细胞被阻滞于G0/G1期(P<0.05),且细胞凋亡率明显升高(P<0.05)。结论:FBXW7高表达可抑制乳腺癌MCF-7细胞的增殖、侵袭和迁移,并可促进细胞凋亡。     

纤维连接蛋白FNDC10通过增强STAT3活化促进乳腺癌细胞的恶性生物学行为

目的：研究纤维连接蛋白Ⅲ型域包含蛋白10(FNDC10)对乳腺癌细胞增殖、迁移和侵袭等能力的影响,并初步探讨其作用机制。方法：采用TCGA数据库分析FNDC10在乳腺癌组织中表达情况。通过qPCR检测FNDC10在正常永生化乳腺细胞（MCF-10A）和乳腺癌细胞（MCF-7、MDA-MB-231、BT549、MDA-MB-468、HCC1806和HCC1937）中的表达水平。选取MCF-7和MDA-MB-231细胞转染FNDC10 siRNA或对照siRNA后进行功能实验：CCK-8实验检测FNDC10对乳腺癌细胞增殖的影响,集落形成实验检测对乳腺癌细胞集落形成能力的影响,Transwell实验检测其对乳腺癌细胞迁移和侵袭能力的影响,WB法检测转移相关分子和细胞信号通路在蛋白水平的变化。结果：FNDC10在乳腺癌组织中的表达水平明显高于正常组织（P<0.01）,FNDC10在乳腺癌细胞MCF-7和MDA-MB-231内表达水平高于正常乳腺细胞（P<0.01或P<0.05）。敲低FNDC10表达抑制了乳腺癌细胞的增殖、迁移和侵袭（P<0.01或P<0.05）...     

ERK1/2 MAPK在赖氨匹林对MCF-7细胞增殖抑制中的作用

背景与目的:探讨赖氨匹林(Aspisol)在抑制人乳腺癌MCF-7细胞增殖过程中,对ERK1/2 MAPK信号转导通路的影响.材料与方法:采用免疫细胞化学方法测定MCF-7细胞中环氧合酶-2(COX-2)的表达.采用噻唑蓝(MTY)比色法检测Aspisol对MCF-7增殖的抑制作用;采用流式细胞仪检测细胞凋亡情况;应用Western blot分别检测ERKl/2、p-ERK]/2蛋白和凋亡相关蛋白Bcl-2、Bax的表达.结果:在MCF-7细胞中未检测到COX-2的表达.Aspisol对MCF-7细胞增殖有明显的抑制作用,且具有剂量和时间依赖性(P＜0.01).Aspisol可诱导MCF-7细胞凋亡,并随着剂量的增大细胞的凋亡率升高(P＜0.05).Aspisol抑制MCF-7细胞pERK蛋白的表达(P＜0.05),但不影响总ERKI/2蛋白的表达(P＞0.05);Aspisol可促进Bax蛋白表达(P＜0.05),但抑制Beb2的表达(P＜0.05).结论:Aspisol影响ERKI/2 MAPK信号转导通路,调节凋亡相关蛋白表达是其抑制MCF-7细胞增殖的作用之一.     

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。     

贝母素乙通过调控PI3K/Akt信号通路诱导乳腺癌MCF-7细胞凋亡

目的：探究贝母素乙（Peiminine）对乳腺癌细胞MCF-7细胞凋亡的影响及其可能作用机制。方法：采用不同浓度贝母素乙或联合PI3K抑制剂LY294002干预MCF-7细胞,MTT法检测细胞增殖能力;Hoechst33258染色和Annexin V-FITC/PI流式细胞术检测细胞凋亡情况;JC-1染色法检测细胞线粒体膜电位变化;Western blotting检测细胞中PI3K(p110α)、Akt、p-Akt(ser473)、Bad、Bax、Bcl-2、cleaved-Caspase-3以及线粒体和胞浆中细胞色素C(Cyt C)等蛋白表达水平。结果：贝母素乙可呈时间-浓度依赖性抑制MCF-7细胞增殖,诱导细胞出现凋亡形态改变,促进细胞凋亡,并降低线粒体膜电位,上调细胞中Bad、Bax、cleaved-Caspase-3及胞浆中Cyt C蛋白表达水平,下调PI3K(p110α)、p-Akt、Bcl-2和线粒体中Cyt C蛋白表达水平,而Akt蛋白表达水平无显著变化。然而,联合LY294002干预可增强贝母素乙对MCF-7细胞凋亡的促进作用。结论：贝母素乙可诱导乳腺癌MCF-7细胞凋...     

紫花牡荆素抑制乳腺癌MCF-7细胞增殖与侵袭能力的研究

目的观察紫花牡荆素对乳腺癌MCF-7细胞株增殖与侵袭能力的影响并探讨其分子机制。方法应用四甲基偶氮唑蓝（MTT）比色法与侵袭实验检测紫花牡荆素对MCF-7细胞增殖与侵袭能力的影响,应用反转录PCR、Western blot法、Tunel法检测紫花牡荆素对基因表达、蛋白表达、细胞凋亡的影响。结果不同浓度紫花牡荆素均抑制MCF-7细胞增殖水平,同未加药对照组比较差异均有统计学意义（P〈0．05）,5、10、20μmol／L紫花牡荆素作用后,MCF-7细胞迁移数与未处理组相比分别降低20.3％、44．4％和50．3％（P〈0．05）。以10μmol／L紫花牡荆素处理后,凋亡细胞数增多,可以上调Bax与Caspase-3蛋白的表达水平,下调基质金属蛋白酶（MMP）-2与MMP-9的mRNA和蛋白表达水平。结论紫花牡荆素对于乳腺癌细胞恶性增殖与侵袭能力具有显著抑制作用。     

银杏内脂B对人骨肉瘤Saos-2细胞的抑制作用研究

目的 探讨银杏内脂B（GB）对骨肉瘤（OS）细胞增殖、凋亡和迁移侵袭的影响以及潜在机制。方法 将人骨肉瘤Saos-2细胞分别在含300、600和1200 μmol/L GB的培养液中培养24、48和72 h,采用CCK-8法检测Saos-2细胞的增殖情况,流式细胞仪检测Saos-2细胞凋亡率,Transwell小室迁移与侵袭实验检测GB对Saos-2细胞迁移和侵袭能力的影响;提取GB处理后Saos-2细胞的mRNA和蛋白,采用实时荧光定量PCR和Western blotting检测Bcl-2、Bax、MMP-2和MMP-9的基因及蛋白表达水平,Western blotting法检测Erk和Akt磷酸化及cleaved-caspase-3水平。结果 GB能明显抑制Saos-2细胞的增殖,且呈时间和浓度依赖性,600和1200 μmol/L GB可诱导Saos-2细胞凋亡,GB对Saos-2细胞的迁移及侵袭的抑制作用呈浓度依赖性;GB可升高Bax mRNA和蛋白水平,但降低Bcl-2、MMP-2和MMP-9的mRNA和蛋白水平;高浓度GB能抑制Erk和Akt的磷酸化且升高cleaved-caspase-3水平。结论 GB具有抑制Saos-2细胞增殖及迁移侵袭和诱导细胞凋亡作用,其机制可能与抑制Erk和Akt磷酸化有关。     

Effect of MicroRNA-766 Promotes Proliferation,Chemoresistance, Migration,and Invasion of Breast Cancer Cells

IntroductionBreast cancer (BCa) remains the most common cancer in women worldwide. It has been shown that microRNAs (miRs) play essential roles in tumorigenesis and progression in many types of cancers, including BCa. We assessed the role of miR-766 on the proliferation, chemosensitivity, migration, and invasion of BCa cells.Materials and MethodsThe effect of miR-766 on the proliferation of MCF-7 and T47D BCa cells was evaluated using the MTT assay. The function of miR-766 on the migration and invasion of MCF-7 and T47D cells was examined using Transwell migration and Matrigel invasion assays. Protein expression was evaluated by Western blot. The role of miR-766 on 5-fluorouracil–induced apoptosis in MCF-7 and T47D cells was determined using the Caspase-Glo3/7 assay. A subcutaneous tumor xenograft was performed to examine the effect of miR-766 on tumor growth in vivo.ResultsUpregulation of miR-766 improved the proliferation, invasion, and migration of BCa cells. Furthermore, miR-766 reduced the sensitivity of MCF-7 and T47D cells to 5-fluorouracil treatment. The tumor xenograft experiment showed that miR-766 promoted BCa growth in vivo. miR-766 decreased 5-flurouracil–induced apoptosis by regulation of BAX and Bcl-2 expression. miR-766 also affected the epithelial–mesenchymal transition by altering E-cadherin, N-cadherin, SNAIL, and vimentin expression in MCF-7 and T47D cells. Further study showed that the expression of phosphatase and tensin homolog and phosphorylated AKT in MCF-7 and T47D cells had changed after aberrant expression of miR-766.Conclusion: miR-766 displayed important roles in tumorigenesis and progression in BCa cells and might act as a potential biomarker to predict the chemotherapy response and progression in BCa.     

辛伐他汀对人乳腺癌细胞MCF-7的生长抑制作用及机制研究

目的 探讨辛伐他汀（SVA）体外对乳腺癌细胞MCF-7的生长抑制作用及其可能的机制。 方法 选用人乳腺癌MCF-7细胞进行体外培养,采用四甲基偶氮唑盐法检测不同浓度SVA（0、3.25、6.25、12.5、25、50和100 μmol／L）处理MCF-7细胞24、48、72 h后的增殖抑制作用,荧光染色法观察SVA（0、2和4 μmol／L）处理MCF-7细胞48 h后的凋亡形态学变化,流式细胞仪测定SVA（0和4 μmol／L）处理MCF-7细胞48 h后的细胞周期变化,免疫印迹法分析SVA（0、2、4和8 μmol／L）处理MCF-7细胞72 h后细胞内Bcl-2和Bax蛋白水平的表达。结果 不同浓度SVA处理不同时间后,MCF-7细胞的增殖明显受到抑制,且增殖抑制作用呈时间和浓度依赖性;荧光显微镜观察发现SVA能够诱导MCF-7细胞出现核固缩、染色质凝集等凋亡形态学改变。流式细胞仪检测细胞周期显示,SVA阻滞MCF-7细胞于G0／G1期。免疫印迹 结果 显示,SVA处理组的Bcl-2蛋白表达水平低于对照组,Bax蛋白表达水平明显高于对照组,且随SVA浓度的增高,Bcl-2蛋白水平逐渐降低,Bax蛋白水平逐渐升高。结论 SVA对人乳腺癌MCF-7细胞具有增殖抑制作用,且呈浓度和时间依赖性,其抗肿瘤机制可能与诱导细胞周期阻滞、下调Bcl-2蛋白及上调Bax蛋白表达有关。     

Overexpression of basic fibroblast growth factor (FGF-2) downregulates Bcl-2 and promotes apoptosis in MCF-7 human breast cancer cells

Basic fibroblast growth factor (bFGF, FGF-2), a classical transforming factor, mitogen, and survival factor in multiple cell types, and has a paradoxic role in mammary epithelial cell transformation and proliferation. We have also demonstrated that recombinant FGF-2 uncharacteristically promotes cell death in MCF-7 human breast cancer cells. In this study, we investigated the effects of FGF-2 overexpression on survival in the same MCF-7 cells. In eight breast cancer cell lines and two nontransformed mammary epithelial cell lines, we demonstrated that high levels of Bcl-2 are only expressed in cells with undetectable levels of FGF-2 on western blot. In retrovirally transduced MCF-7 cells expressing both cytoplasm- and nucleus-localizing FGF-2 species and ones expressing only cytoplasm-localizing FGF-2 species, Bcl-2 levels were strongly decreased at both the mRNA and protein levels. Immunoprecipitation of Bax demonstrated a decreased association of Bax with Bcl-2 in these cells. Levels of Bax did not correlate with expression of FGF-2 in the 10 cell lines or in MCF-7 cells. The clonogenic potential of MCF-7 cells in tissue culture was decreased by the expression of FGF-2 and was additively suppressed by the chemotherapeutic agents etoposide and 5-fluorouracil in a dose and time dependent manner. MCF-7 cells overexpressing FGF-2 had a greater rate of programmed cell death at baseline and in response to etoposide and 5-fluorouracil in a TUNEL assay by immunofluorescent microphotography and by flow cytometric quantitation. The pro-apoptotic effect of FGF-2 overexpression on the chemosensitivity of these cells was confirmed by quantitative morphologic determination. These data demonstrate that the expression of FGF-2 downregulates Bcl-2 and promotes programmed cell death in MCF-7 human breast cancer cells.     

Estrogen increases intracellular p26Bcl-2 to p21Bax ratios and inhibits taxol-induced apoptosis of human breast cancer MCF-7 cells

Recent studies have demonstrated that following estrogen ablation, estrogen responsive breast cancer cells undergo apoptosis. In addition, estrogen receptor (ER) expression has been strongly correlated with the expression of the bcl-2 gene product, p26Bcl-2 protein, which is known to inhibit apoptosis. In the present studies, we investigated whether estrogen affects the intracellular levels of p26Bcl-2 and thereby modulates taxol-induced apoptosis of estrogen responsive human breast cancer MCF-7 cells. Transfer of MCF-7 cells to a culture-medium without estrogens reduced their intracellular p26Bcl-2 levels by 50%. Inclusion of 0.1 M estradiol in the medium produced approximately a four-fold increase in p26Bcl-2, but not p29Bcl-xL or p21Bax levels; the expression of the c-myc and mdr-1 genes remained unchanged. Estradiol-induced four-fold increase in the ratio of the p26Bcl-2 to p21Bax levels caused a significant decline in the lethal, kilobase size DNA fragments of apoptosis, which had resulted when MCF-7 cells were cultured in a medium without estrogen. In addition, in MCF-7 cells, estradiol-induced increase in the intracellular p26Bcl-2 to p21Bax ratios was associated with a significant reduction in the large-sized DNA fragmentation induced by treatment with taxol. The increased ratios also protected MCF-7 cells against taxol-mediated cytotoxicity as assessed by the MTT assay. These results suggest that by modulating p26Bcl-2 levels, estrogens may affect the antitumor activity of taxol and potentially of other anti-breast cancer drugs against estrogen responsive human breast cancer cells.     

雷公藤内酯醇通过调控miR-142-3p/HSP70通路抑制人乳腺癌MCF-7细胞增殖、侵袭和迁移

目的：探究雷公藤内酯醇（TP）通过miR-142-3p/HSP70信号通路对人乳腺癌MCF-7细胞恶性生物学行为的影响。方法：常规培养MCF-7细胞,将其分为6组：对照组、TP组、miR-142-3p inhibitor组、TP+inhibitor组、miR-142-3p mimic组和TP+mimic组,用转染试剂将相应的核酸或质粒转染MCF-7细胞。qPCR法、EdU细胞增殖实验、Transwell小室实验、细胞划痕实验、WB法分别检测转染后各组MCF-7细胞中miR-142-3p和HSP70 mRNA的表达,MCF-7细胞的增殖、侵袭、迁移能力和HSP70蛋白表达水平。结果：TP或miR-142-3p过表达能显著促进MCF-7细胞中miR-142-3p和HSP70的表达,敲减miR-142-3p则可明显抑制MCF-7细胞中miR-142-3p和HSP70的表达,TP可逆转由敲减miR-142-3p对MCF-7细胞中miR-142-3p和HSP70表达的影响;TP、过表达miR-142-3p均可明显抑制MCF-7细胞的增殖、迁移和侵袭能力（均P<0.05）,敲减miR-142...     

Bcl-2 overexpression sensitizes MCF-7 cells to genistein by multiple mechanisms

Genistein is a soy isoflavone with anti-tumor properties. Genistein-induced apoptosis involves Bcl-2 downregulation. However, overexpression of Bcl-2 in breast cancer has been associated with better prognosis and response to hormonal therapy. To examine genistein's effect on breast cancer cells with different Bcl-2 levels, we established control (MCF-7/PV) and Bcl-2 overexpressing MCF-7 (MCF-7/Bcl-2) cell lines and characterized genistein regulated apoptosis and cell cycle progression in these cells. Our results demonstrate that overexpression of Bcl-2 rendered MCF-7 cells more sensitive, rather than resistant, to genistein. We found that genistein induces enhanced cytochrome c release and mitochondrial membrane depolarization in MCF-7/Bcl-2 cells, as compared to control. We also found that genistein increases Bcl-2 levels and Bcl-2/Bax ratio in the mitochondrial fractions of MCF-7/Bcl-2 cells, suggesting that disturbed Bcl-2/Bax distribution may cause cytochrome c release and apoptosis in these cells. Cell cycle analysis indicated that genistein induces G0/G1 arrest in MCF-7/PV cells but increases in G2/M arrest in MCF-7/Bcl-2 cells. This was accompanied by modified responses of several cell cycle regulators, such as p21 and cyclin B1. Taken together, our results indicate that genistein-Bcl-2 interaction switches Bcl-2 from an anti-apoptotic protein into a proapoptotic protein, which involves disturbed Bcl-2/Bax distribution in mitochondria, increased cytochrome c release and modified cell cycle regulation.     

Rap2a对肺癌细胞侵袭能力的影响及其机制

目的 检测小G蛋白家族成员Rap2a对人肺癌细胞迁移侵袭的影响及机制探讨。方法 构建pcDNA3.1-Rap2a质粒,转染入A549和H1299细胞,运用划痕和Transwell小室实验观察Rap2a对肺癌细胞侵袭能力的影响。CCK-8和流式细胞术检测Rap2a对细胞增殖和凋亡的影响,Western blot检测Bcl-2、Bax、ERK和Akt等的蛋白表达水平。结果 与空质粒组相比,转染Rap2a质粒的肺癌细胞侵袭能力明显增加,但细胞的增殖和凋亡能力无明显变化, Bcl-2和Bax的蛋白水平也无明显变化。Western blot结果显示,Rap2a过表达后p-Akt473的表达水平增加。结论 人Rap2a促进肺癌细胞的迁移侵袭可能与Rap2a影响Akt磷酸化水平有关。