金雀黄素对人乳腺癌细胞系体外增殖作用的影响

为了探讨金雀黄素对人乳腺癌细胞系体外增殖作用的影响,应用体外细胞培养和MTT比色法观察金雀黄素对人乳腺癌细胞系体外增殖作用的影响。结果表明,金雀黄素对MDA-MB-231细胞和MCF-7细胞的增殖均有抑制作用,但对MCF-7细胞抑制作用更为明显。结论:金雀黄素对乳腺癌细胞系体外增殖具有明显的抑制作用,为进一步阐明其抑癌作用机制奠定了实验基础。     

血管内皮生长因子在乳腺癌中的表达及意义

目的：探讨血管内皮生长因子（VEGF）在乳腺癌中的表达及其临床意义。方法：应用免疫组织化学法检测74例乳腺癌组织中VEGF的表达。分析其与乳腺癌临床病理特征及预后的关系。结果：VEGF的阳性表达率为64．9％。VEGF的表达与肿瘤大小（P〈0．05）、临床分期（P〈0．05）、腋淋巴结转移（P〈0．05）有关。VEGF表达阴性和阳性两组5年总生存率（overall survival，OS）和无瘤生存率（disease free survival，DFS）差异有显著性（P〈0．05）。结论：VEGF阳性表达提示乳腺癌预后不良。VEGF可为判断乳腺癌预后的有效指标。     

血管内皮生长因子在乳腺癌表达的作用及意义

目的探讨血管内皮生长因子（VEGF）在乳腺癌的表达与肿瘤临床和病理的关系。方法取65倒手术切除乳腺癌蜡块标本,另取乳腺癌癌旁组织作为对照组织。采用免疫组织化学染色检测VEGF在乳腺癌组织中的表达情况。结果 65例乳腺癌组织中VEGF。表达总阳性率为78.46%（51/65）;vEGF的表达与患者的年龄、肿瘤大小、组织学分型等无关,与乳腺癌的组织学分级、淋巴结转移密切相关。结论 VEGF可促进乳腺癌的浸润和转移,在乳腺癌的发展、转移中起重要作用,检测VEGF的表达可作为乳腺癌恶性程度、浸润转移等生物学行为的参考指标。     

三氧化二砷对人大肠癌LoVo细胞血管内皮生长因子表达的影响

目的 探讨血管内皮生长因子(VEGF)在人大肠癌细胞株LoVo中的表达及三氧化二砷(As2O3)对其表达的影响.方法 应用实时定量PCR法和免疫细胞化学法检测As2O3干预前后LoVo结肠癌细胞中VEGF mRNA及VEGF蛋白表达.结果 LoVo大肠癌细胞表达VEGF,VEGF基因表达与蛋白表达呈正相关,且VEGF表达随着As2O3剂量的增加而下降.结论 VEGF在人结肠癌细胞LoVo中表达,As2O3可显著抑制VEGF的表达,呈剂量依赖性,表明As2O3具有抑制肿瘤血管生成的作用.     

沙立度胺对乳腺癌细胞血管内皮生长因子表达的影响

目的 观察沙立度胺对人乳腺癌细胞系MCF-7、MDA-MB-231细胞血管内皮生长因子(VEGF)表达的抑制作用.方法 应用半定量逆转录-聚合酶链反应(RT-PCR)技术,分别观察沙立度胺对MCF-7和MDA-MB-231细胞VEGF表达的抑制作用.结果 沙立度胺在50μg/L明显抑制两株细胞VEGF mRNA的表达,但浓度增高到100μg/L抑制VEGF mRNA表达的作用反而减弱.结论 沙立度胺在一定浓度范围内能抑制乳腺癌细胞VEGF mRNA的表达.     

乳腺癌淋巴管密度与血管内皮生长因子C相关性分析

目的 探讨乳腺癌组织内淋巴管密度（LVD）与血管内皮生长因子C（VEGF-C）的相关性。方法收集我院2006至2009年乳腺癌患者标本40例,另取乳腺纤维瘤组织标本5例,正常乳腺组织标本5例;采用酶组织化学双重染色法,对50例乳腺组织标本的LVD进行了检测和分析。同时采用免疫组化SP法检测50例乳腺组织标本VEGF-C的表达。结果乳腺癌组织的LVD、VEGF-C阳性表达率明显高于对照组（P〈0．05）。乳腺癌淋巴结转移阳性组LVD、VEGF．C阳性表达率均明显高于淋巴结转移阴性组（P〈0．05）。乳腺癌LVD与VEGF．C的表达成正相关（P〈0．05）。结论乳腺癌组织中LVD、VEGF—C表达水平增高,LVD与VEGF-C的表达促进乳腺癌淋巴结的转移。     

血管内皮生长因子

血管内皮生长因子是一类能够特异地作用于血管内皮细胞,通过特异性受体发挥生物学作用的血管生长调控因子。促进内皮细胞增生;增加细胞质钙离子浓度;增加血管渗透性,改变细胞外基质,促进血管生成,其中一些因子还在淋巴管生成中起作用。本文对血管内皮生长因子的特征、生物学作用等进行了综述。     

血管内皮生长因子在乳腺癌中的表达及意义

目的研究血管内皮生长因子(VEGF)在乳腺癌中的表达情况及其与乳腺癌预后的关系,探讨其在乳腺癌中的预后价值。方法应用免疫组织化学法检测64例乳腺癌组织VEGF。结果VEGF的阳性表达率为63%。VEGF与肿瘤的大小、TNM分期、组织学分级、腋淋巴结转移呈正相关。结论VEGF为判断乳腺癌预后的有效指标。     

血管内皮生长因子C及其受体表达与乳腺癌淋巴结转移的相关性研究

目的本研究旨在检测乳腺癌组织中VEGF-C/VEGFR-3、LVD的表达情况,探讨其表达水平淋巴结转移的相互关系,进一步研究肿瘤转移的机制,为抗淋巴管形成、进而为抗乳腺癌淋巴转移的治疗提供理论依据。方法应用免疫组织化学(SP)法检测83例乳腺癌手术标本的原发灶的VEGF-C及其受体VEGFR-3的表达及LVD。结果83例乳腺癌组织VEGF- C阳性表达者36例(43.3%),淋巴结转移组的VEGF-C阳性表达率为59.4%(24/44),显著高于无淋巴结转移组30.8%(24/44),(P<0.05);在VEGF-C表达阳性组、阴性组中LVD统计学上差异显著(P<0.05),结论乳腺癌组织VEGF-C表达可能促进肿瘤内淋巴管的生成;乳腺癌的淋巴结转移和VEGF-C的高表达密切相关。     

金雀异黄素和槲皮素对人类乳腺癌细胞增殖和细胞周期的影响

目的探讨金雀异黄素(genistein,Gen)和槲皮素(quercetin,Que)对人类乳腺癌细胞株增殖的影响。方法采用噻唑蓝(MTT)比色法测定槲皮素对雌激素依赖性乳腺癌细胞MCF-7、T47D和非雌激素依赖性乳腺癌细胞MDA-MB231的细胞增殖作用,并以雌激素受体拮抗剂ICI182780为工具药来评价金雀异黄素、槲皮素发挥雌激素样作用与雌激素受体的关系,流式细胞术对MCF-7细胞的增殖情况进行分析。结果Gen和Que在一定剂量范围内能促进T47D和MCF-7细胞的增殖,而对雌激素受体阴性MDA-MB231细胞未见增殖作用,并将MCF-7细胞周期由G1期向S期推进,促进DNA合成,提高细胞分裂增殖指数,且Gen和Que促进MCF-7细胞增殖作用被雌激素受体拮抗剂所拮抗。结论金雀异黄素和槲皮素具有雌激素活性,此作用可能是通过雌激素受体(ER)介导的。     

Antiproliferative potential of sarcophine and its semisynthetic sulfur-containing derivatives against human mammary carcinoma cell lines

The marine-derived cembranoid sarcophine (1) and its sulfur-containing semisynthetic derivatives (2–6) were evaluated for anticancer potential using cell cycle progression markers. No effect on MCF-7 cell viability or apoptosis was seen with these derivatives at concentrations of up to 100 μM after 72 h of incubation. At 100 μM, sarcophine and its derivatives 2–5 arrested the MCF-7 cells in G0/G1 phase, with concomitant decrease in the cell populations at S and G2+M phases. MDA-MB-231 cells were not responsive to any of the derivatives. Our preliminary results suggest that the sulfur-containing derivatives of sarcophine, especially 2 and 3, show potent and cell-specific antiproliferative activity.     

Antiestrogen, trans-tamoxifen modulation of human breast cancer cell growth

To gain further insight into how estrogens modulate cell function, the effects of estrogen on cell proliferation were studied in human breast cancer cells. We examined the effects of estrogen on the proliferation of three human breast cancer cell lines that differed in their estrogen receptor contents. Ten nM estradiol markedly stimulated the proliferation of MCF-7 human breast cancer cells that contained high levels of estrogen receptor (1.15±0.03 pmole/mg protein) over that of control. In T47D cells that contained low levels of estrogen receptor (0.23±0.05 pmole/mg protein), Ten nM estrogen slightly stimulated the proliferation over that of control. MDA-MB-231 cells, that contained no detectable levels of estrogen receptors, had their growth unaffected by estrogen. These results showed their sensitivity to growth stimulation by estrogen correlated well with their estrogen receptor content. Also we examined the effect of estrogen on cellular progesterone receptor level as well as plasminogen activator activity in MCF-7 cells. Ten nM estradiol showed maximal stimulation of progesterone receptor level as well as plasminogen activator activity in MCF-7 cells. It is not clear whether these stimulations of progesterone receptor and plasminogen activator activity by estrogen are related to the estrogen stimulation of cell proliferation of MCF-7 cells. Studies with estrogen in human breast cancer cells in culture indicate that sensitivity to growth stimulation by estrogen correlates well with estrogen receptor contents.     

Melatonin modulates the cadmium-induced expression of MT-2 and MT-1 metallothioneins in three lines of human tumor cells (MCF-7, MDA-MB-231 and HeLa)

Cadmium (Cd) is a human carcinogen present in tobacco smoke and contaminated industrial soils. Metallothioneins (MTs) are intracellular proteins involved in protecting against Cd. The toxic effects of Cd can be modified by compounds able to modulate MTs synthesis. Melatonin has oncostatic properties and has also been shown to counteract the toxic effects of Cd. In this study we examine the possible role of melatonin in Cd-induced expression of several MT isoforms (MT-2A, MT-1X, MT-1F and MT-1E) in three human tumor cell lines (MCF-7, MDA-MB-231 and HeLa). We found that, in all cell types, melatonin increases Cd-induced expression of MT-2A, which is considered to protect against Cd toxicity. As regards MT-1 subtypes, which have been related with cell invasiveness and high histological grade tumors, melatonin caused Cd-induced expression in both breast cancer cell lines to decrease. These effects point towards melatonin's possible role as a preventive agent for carcinogenesis dependent on Cd contamination.     

HSPG和无HS-GAGs链HSPG体外抗乳腺癌的研究

目的：比较硫酸乙酰肝素蛋白聚糖（简称HSPG）和去硫酸乙酰肝素链（简称HS-GAGs链即HS链）的HSPG的体外抗人乳腺癌细胞MDA-MB-231的抗增殖和凋亡诱导作用。方法：对HSPG进行提取、纯化,硫酸乙酰肝素酶1水解HSPG的HS链;光学显微镜法观察两组分引起的细胞形态学的变化;MTT比色法检测两组分对肿瘤细胞生长曲线的影响;流式细胞术结合Annexin V-FITC及PI双染标记法观察两组分对肿瘤细胞凋亡的影响。结果：HSPG可致MDA-MB-231细胞脱落悬浮;MTT法检测结果显示HSPG对MDA-MB-231细胞增殖的抑制作用随浓度的增加而增强,而去HS链HSPG只有在高浓度时才呈现出抑制作用。HSPG能诱导MDA-MB-231的早期凋亡,而去HS链HSPG在高浓度（4 mg/mL）时对MDA-MB-231早期凋亡有诱导作用。结论：HSPG能诱导MDA-MB-231的早期凋亡和抑制细胞生长增殖。作用机制可能与HSPG的硫酸乙酰肝素链有关。     

补骨脂素对人类乳腺癌细胞增殖作用的影响

目的研究补骨脂素(psoralen,Pso)对人类乳腺癌细胞株增殖的影响。方法采用噻唑蓝(MTT)比色法测定补骨脂素对雌激素依赖性乳腺癌细胞MCF-7和非雌激素依赖性乳腺癌细胞MDA-MB231的细胞增殖作用,并以雌激素受体拮抗剂ICI182,780为工具药来评价补骨脂素发挥雌激素样作用与雌激素受体的关系,流式细胞术对MCF-7细胞的增殖情况进行分析。结果与溶剂对照组相比较,Pso(10～40μmol.L-1)能明显促进MCF-7细胞的增殖,而对雌激素受体阴性MDA-MB231细胞未见影响,并将MCF-7细胞周期由G1期向S期推进,促进DNA合成,提高细胞分裂增殖指数,且Pso促进MCF-7细胞增殖作用被雌激素受体拮抗剂所拮抗。结论补骨脂素具有雌激素活性,此作用是通过雌激素受体(ER)介导的。     

黄芩素抑制人乳腺癌细胞侵袭和迁移的实验研究

目的探讨黄芩素(baicalein)对人乳腺癌MDA-MB-231细胞侵袭和迁移的作用及其机制。方法 MTT法检测Baicalein对细胞活力的影响;Transwell小室测定其侵袭力和迁移力;细胞划痕实验测定细胞运动能力;Western blot检测细胞MMP2、MMP9和uPA的表达。结果与对照组相比,50、100μmol·L-1的baicalein明显抑制了MDA-MB-231细胞的侵袭(P<0.01)和迁移(P<0.01)。其中,baicalein对细胞侵袭抑制率分别为15%和44%,对细胞迁移的抑制率分别为50%和77%。50μmol·L-1的baicalein抑制了MMP2的表达水平,100μmol·L-1的baicalein分别抑制了MMP9和uPA的表达水平。结论 baicalein能够抑制MDA-MB-231细胞侵袭和迁移,其机制可能与直接抑制细胞侵袭和迁移能力,抑制MMP2、MMP9和uPA的表达有关。     

Expression of Cox-2 in human breast cancer cells as a critical determinant of epithelial-to-mesenchymal transition and invasiveness

Introduction: Cyclooxygenase-2 (COX-2) is overexpressed in several malignancies and is implicated in breast cancer progression.

Objectives: We investigated whether changes in COX-2 expression may affect epithelial-to-mesenchymal transition (EMT) and then invasive potential of human breast cancer cells, in relationship with hypoxia. COX-2-null MCF-7 human breast cancer cells, MCF-7 cells transiently expressing COX-2 and COX-2-expressing MDA-MB-231 cells were employed.

Results: COX-2 overexpression resulted in downregulation of E-cadherin and β-catenin, upregulation of vimentin, N-cadherin and SNAI1, suggesting EMT occurrence. COX-2-overexpressing MCF-7 cells were also characterized by increased invasiveness and release of matrix-metalloproteinase-9. The above-mentioned characteristics, homologous to those detected in highly invasive MDA-MB-231 cells, were reverted by treatment of COX-2-overexpressing MCF-7 cells with celecoxib, a COX-2-specific inhibitor, partly through the inhibition of COX-2-related intracellular generation of reactive oxygen species. Hypoxia further exacerbated COX-2 expression, EMT changes and invasive ability in both COX-2-overexpressing MCF-7 cells and MDA-MB-231 cells. Finally, immunohistochemistry performed on samples from normal and neoplastic human breast tissues revealed that COX-2-positive malignant cells were also positive for EMT-related antigens, hypoxia-inducible factor (HIF)-2α and the oxidative stress marker heme oxygenase.

Conclusions: These findings support the existence of a direct link between COX-2 overexpression, EMT and invasiveness in human breast cancer cells, emphasizing the role of hypoxic microenvironment.     

甘精胰岛素和人胰岛素对人乳腺癌MDA-MB-231细胞的增殖作用

目的探讨甘精胰岛素(insulin glargine)和人胰岛素(human insulin)对人乳腺癌细胞株MDA-MB-231增殖的影响及细胞外信号调节激酶(ERK)的调节作用。方法使用不同浓度的甘精胰岛素和人胰岛素刺激人乳腺癌MDA-MB-231细胞株,检测不同时间段的细胞增殖作用,探讨抑制ERK1/2激活对细胞增殖的影响。使用cell counting kit-8(CCK-8)试剂检测细胞增殖,流式细胞术检测细胞周期分布。结果甘精胰岛素和人胰岛素在1、10、100IU.L-1刺激MDA-MB-231细胞96h后均可轻度促进MDA-MB-231细胞增殖,相同条件下甘精胰岛素和人胰岛素的促增殖效应无差异。甘精胰岛素与人胰岛素以10IU.L-1分别刺激48、72、96h后两药均诱导细胞增殖,比较两种药物间增殖效应的差异无统计学意义。甘精胰岛素和人胰岛素均使S+G2/M期细胞比例增加,但两处理组间差异无显著性。ERK1/2抑制剂PD98059可抑制MDA-MB-231细胞增殖;但PD98059不影响甘精胰岛素和人胰岛素对MDA-MB-231细胞增殖的促进作用。结论甘精胰岛素和人胰岛素对人乳腺癌细胞株MDA-MB-231增殖有类似的轻度促进作用,该作用不依赖于ERK的激活。     

体外观察雷公藤内酯醇对乳腺癌细胞MCF-7增殖及凋亡的影响

目的:探讨雷公藤内酯醇(triptolide,TP)对人乳腺癌细胞MCF-7增殖及凋亡的影响。方法:MTT法检测不同条件下TP对MCF-7细胞的增殖抑制作用;倒置显微镜观察TP对MCF-7细胞形态学影响;流式细胞仪检测MCF-7细胞的凋亡情况;Caspase检测试剂盒测定Caspase-3,9的变化。结果:TP以剂量及时间依赖性方式明显抑制MCF-7细胞的增殖;TP作用MCF-7细胞后,细胞出现明显的形态学改变(形态不规则、脱落,细胞碎片等)。流式细胞仪检测5μg/mL的TP明显诱导MCF-7细胞凋亡;Caspase-3,9表达水平明显升高,和对照组相比差异有统计学意义(P<0.05)。结论:TP可能通过线粒体通路诱导MCF-7细胞凋亡而发挥其抑制作用。