环境雌激素对卵巢癌细胞PE04凋亡的影响

目的探讨膳食中的环境雌激素大豆异黄酮(genistein,GS)及玉米赤霉烯酮(zearalenone,ZEA)对卵巢癌细胞PEO4凋亡的影响.方法将PEO4细胞在DMEM培养液(含10%小牛血清)中采用开放式单层贴壁培养,开始试验前将培养细胞用磷酸盐缓冲溶液洗涤后改为在无酚红DMEM培养液(含5%CDT-FBS)中继续培养5 d,其目的是耗尽细胞内储存的雌激素.实验设溶剂对照、雌激素对照、抗雌激素对照及2个试验组.观察指标包括亚二倍体细胞的峰高及位置,DNA断裂片段及凋亡小体的形成情况.结果雌激素耗尽能够明显诱导PEO4细胞发生凋亡,在这时候往培养液中分别加入32×10-9mol/L及96×10-9 mol/L的ZEA可抑制细胞的凋亡作用;而分别加入32×10-6mol/L及96×10-6 mol/L GS对细胞处理72 h可加重细胞的凋亡现象.结论 ZEA具有雌激素效应,可模拟雌二醇抑制细胞的凋亡作用;GS具有抗雌激素效应,在较大剂量范围内可促进细胞的凋亡.     

双酚A等化学物对耗尽内源性雌激素诱导T47D细胞凋亡的影响

目的　在乳腺癌细胞株T4 7D细胞内采用雌激素耗尽的方法诱导其发生凋亡 ,然后观察对 壬基酚 (n 4 noniphenol,NP)、双酚A (bisphenolA ,BisA )和邻苯二甲酸酯二丁酯(dibutylphthalate ,DBP)对这种凋亡的影响 ,探讨环境雌激素是否能够抑制雌激素耗尽所诱导的细胞凋亡作用。方法　T4 7D细胞在达克尔培养液 (DMEM ,含 10 %小牛血清 )中进行常规传代培养 ,于实验前 4d将细胞用磷酸盐缓冲盐水洗涤后改为在无酚红DMEM培养 ,目的是耗尽细胞内源性雌激素。实验设溶剂对照、雌激素对照 (E2 )、抗雌激素他莫昔芬 (TAM)对照及 3个试验组 ,采用流式细胞术 ,琼脂糖凝胶电泳和HE染色镜检观察环境雌激素对雌激素耗尽所诱导的细胞凋亡的影响。结果　流式细胞仪分析结果表明 ,雌激素耗尽能够诱导T4 7D细胞发生凋亡 ,凋亡率为 34 5 % ,此时往培养液中分别加入 32× 10 -7mol/LNP和 32× 10 -7mol/LBisA ,对细胞处理 72h ,可显著抑制细胞凋亡作用 (凋亡率分别变为 2 0 1%和 16 5 % ) ;琼脂糖凝胶电泳显示 ,细胞凋亡特有的DNA ladder消逝 ;HE染色镜检表明 ,细胞出现活跃核分裂相。加入 5× 10 -7mol/LTAM可加重细胞的凋亡现象 (细胞凋亡率为 5 5 6 % )。结论　NP和BisA均可抑制雌激素耗尽所诱导的T4 7D细胞的凋亡作用 ;     

环境雌激素对乳腺癌细胞株MCF-7凋亡作用的影响

[目的] 通过观察对-壬基酚(nonylphenol,NP)、双酚A(bisphenol A,BisA)和邻苯二甲酸二丁酯(dibutylphthalate,DBP)对乳腺癌细胞株MCF-7凋亡的影响,探讨环境雌激素促进MCF-7细胞增殖的生物学机制.[方法] 将在DMEM培养液(含10%小牛血清)中的MCF-7细胞采用开放式单层贴壁培养,加受试物前5 d将培养细胞用PBS洗涤后改为在无酚红DMEM(含5%经活性碳-葡聚糖苷处理的胎牛血清,CDT-FBS)中培养连续5 d,其目的是耗尽细胞内储存的雌激素.实验设溶剂对照组、雌激素对照组、抗雌激素(它莫西芬)对照组及三个实验组,采用流式细胞术、DNA片段凝胶电泳和细胞苏木素染色(HE),观察环境雌激素对雌激素耗尽所诱导的细胞凋亡作用的影响.[结果] 3.2×10-6 mol/L NP和3.2×10-5 mol/L BisA对MCF-7细胞处理72 h,与对照组相比,流式细胞仪分析结果表明,二倍体细胞(G1期细胞)明显增加,亚二倍体细胞峰(即细胞凋亡率)消失,DNA凋亡片段凝胶电泳不显示典型的凋亡DNA片段梯带,细胞苏木素染色结果也显示凋亡细胞明显减少.[结论] 与溶剂对照组相比,NP和BisA均能够抑制MCF-7细胞的凋亡作用,而3.2×10-4 mol/L DBP对细胞凋亡的影响作用不明显.这一结果提示,该类物质有可能是通过抑制细胞凋亡而发挥其促进MCF-7细胞增殖作用的.     

三种增塑剂对乳腺癌细胞株MCF-7增殖的影响

目的　观察对 壬基酚 (NP)、双酚A(BisA)和邻苯二甲酸酯二丁酯 (DBP)对乳腺癌细胞株MCF 7增殖的影响。方法　将MCF 7细胞在达尔克 (DMEM)培养液 (含 10 %小牛血清 )中采用开放式单层贴壁培养 ,开始实验前将培养细胞用磷酸盐缓冲液 (PBS)洗涤后改在无酚红DMEM (含 5 %胎牛血清 )中培养继续 4d以耗尽其内源性雌激素。实验设溶剂对照、雌激素对照、抗雌激素对照及 3种受试物各 4个剂量组 ,采用噻唑蓝 (MTT)法、3 H TdR掺入法及流式细胞术对MCF 7细胞的增殖情况进行分析。结果　与对照组相比 ,NP、BisA和DBP对细胞处理 2 4h ,分别在 96× 10 -7mol/L、96× 10 -7mol/L、96× 10 -6mol/L可促进MCF 7细胞增殖和细胞DNA合成 ,并推进G0 /G1期细胞进入S期 ,提高细胞增殖指数 ;随着培养时间延长至 96h ,3种化合物在较低浓度条件下也表现促进细胞增殖的效果。结论　对 壬基酚、双酚A和邻苯二甲酸酯二丁酯可促进雌激素依赖性乳腺癌细胞MCF 7的增殖 ,可能具有雌激素样作用。     

氯氰菊酯对人乳腺癌细胞MCF-7增殖的影响

目的通过观察氯氰菊酯(cypermethrin,CYP)对人乳腺癌细胞株MCF-7细胞增值的影响,探讨氯氰菊酯促进细胞增殖的生物学机制。方法 MCF-7细胞在加受试物前7 d改为无酚红完全培养基,以耗尽细胞内储存的雌激素。实验设为6组:无水乙醇(EtOH)溶剂对照组、雌二醇(E2)雌激素对照组、他莫西芬(TAM)抗雌激素对照组及氯氰菊酯3个浓度梯度(1.0×10-7mol/L、1.0×10-8mol/L、1.0×10-9mol/L)实验组。采用CCK8法检测各组细胞的增值情况,采用Hoechst 33342和Propidium Iodide双染荧光显微镜观察氯氰菊酯对雌激素耗尽诱导细胞凋亡作用影响。结果第4、5天细胞增殖实验,与EtOH溶剂对照组相比,除TAM抗雌激素组与EtOH溶剂对照组细胞增殖活力低外,其他4组细胞增殖活力低,依次为E2雌激素对照组、氯氰菊酯1.0×10-7mol/L组、氯氰菊酯1.0×10-8mol/L组、氯氰菊酯1.0×10-9mol/L组,P均<0.05;第3天与EtOH溶剂对照组比,E2雌激素对照组MCF-7细胞增殖活力高,P<0.05,第2天差异无统计学意义。荧光显微镜下见,EtOH溶剂对照组相比和TAM抗雌激素组细胞的凋亡作用明显,后者强于前者,而E2雌激素对照组、氯氰菊酯1.0×10-7mol/L组、氯氰菊酯1.0×10-8mol/L组、氯氰菊酯1.0×10-9mol/L组对细胞凋亡作用不明显。结论氯氰菊酯有可能是通过抑制乳腺癌细胞凋亡而发挥其促进细胞增殖作用的。     

膳食雌激素影响乳腺癌MCF-7细胞增殖和凋亡的机制探讨

目的:探讨膳食中常见的两种环境类雌激素大豆异黄酮(genistein,GS)、玉米赤霉烯酮(zearalenone,ZEA)影响人乳腺癌细胞MCF-7增殖和凋亡的分子生物学作用机制。方法:MCF-7细胞在DMEM培养液(含10%胎牛血清)中进行常规传代培养,实验前将细胞转移至无酚红DMEM(含5%活性碳葡聚糖苷处理过的FBS)中继续培养5d,收集细胞,PBS洗涤后接种于内置血盖片的六孔板或75ml培养瓶,32×10-9mol/LZEA和75×10-6mol/LGS对细胞分别处理72h,用半定量RT-PCR技术观察GS对核增殖抗原PCNA、bcl-2及baxmRNA表达的影响,并用免疫组化方法对结果进行验证。结果:与溶剂对照组相比,75×10-6mol/LGS对MCF-7细胞处理72h可显著提高baxmRNA表达而抑制bcl-2和PCNAmRNA的表达,随后的免疫组化实验也证实了这一结果;ZEA的作用效应则与GS相反。结论:膳食雌激素GS和ZEA可通过影响细胞增殖和凋亡相关调节基因PCNA、bcl-2和bax表达而调节人乳腺癌细胞MCF-7的增殖和凋亡作用。     

对硫磷对PEO4卵巢癌细胞凋亡的影响

目的:探讨有机磷农药对硫磷对PEO4卵巢癌细胞凋亡的影响。方法:应用耗尽细胞内雌激素的常规传代培养的PEO4细胞,采用流式细胞仪观察细胞周期分布及其凋亡情况。结果:雌激素耗尽可诱导PEO4细胞发生凋亡。1×10-6mol/L对硫磷处理细胞72小时显著抑制细胞的凋亡作用并可促进细胞由G0/G1期进入S期和G2/M期。结论:有机磷农药污染可能与近年来卵巢癌发病率升高有关。     

染料木黄酮对MCF-7细胞肿瘤相关基因表达的影响

目的:用基因芯片技术观察染料木黄酮(genistein,GS)对雌激素依赖性乳腺癌细胞MCF-7肿瘤相关基因表达的影响。方法:75×10-6mol/LGS对MCF-7细胞处理72h,收集细胞并提取总mRNA,用Cy5和Cy3两种荧光染料通过逆转录反应将mRNA分别标记成两种探针,与载有一组靶基因的人肿瘤相关基因表达谱芯片杂交、经计算机扫描分析得出GS处理后的差异表达基因。结果:筛选出包括与细胞增殖、细胞凋亡、雌激素反应等相关的差异表达基因共22条(7.3%,22/300)。18个下调基因(占81.8%)主要是促进细胞增殖活力的原癌基因和与肿瘤细胞逃逸、扩散有关的肿瘤细胞表面抗原基因;4个上调基因均为雌激素反应性基因。结论:GS所影响的基因多与细胞增殖和肿瘤细胞免疫逃逸调节有关,调节此类基因的表达可能是GS发挥抗癌防癌作用的主要机制;GS上调的4个基因均属于雌激素上调基因,表明GS与雌激素受体结合后,除产生抗雌激素样效应外,还能激活雌激素反应元件而表现一定的雌激素效应。     

染料木黄酮对骨形成的促进作用研究

目的:用成年人成骨细胞体外培养的方法,观察染料木黄酮(genistein,GS)对骨形成的影响。方法:将生长状态良好的第三代成骨细胞用PBS洗涤后接种于无酚红高糖DMEM培养液中(含5%经活性碳-葡聚糖苷处理的胎牛血清),实验设二甲基亚砜溶剂对照、雌二醇对照(E2)、抗雌激素它莫西芬对照(TAM)及三个GS剂量组,观察指标包括细胞增殖,碱性磷酸酶活性及细胞骨钙蛋白合成量。结果:与溶剂对照组相比,10-8mol/L E2、10-7mol/L GS和10-6mol/L GS对人成骨细胞处理48h,能够明显促进成骨细胞的增殖作用,使细胞骨钙蛋白合成量显著增加,细胞内碱性磷酸酶活性明显提高;同时,GS可保护因雌激素耗尽所造成的成骨细胞内Ⅰ型胶原蛋白降低。10-7mol/L TAM可拮抗GS对成骨细胞所产生的这些生物学效应。结论:GS具有雌激素效应,可模拟E2而刺激骨形成并保护成骨细胞因雌激素缺乏所造成的细胞内Ⅰ型胶原蛋白降低。由于这一效应可被TAM拮抗,此结果提示,GS的促进骨形成作用是通过与雌激素受体结合产生的。     

金雀异黄酮对结肠癌细胞HT-29增殖及凋亡的影响

目的观察植物雌激素金雀异黄酮(GS)对人结肠癌细胞HT-29增殖及凋亡的影响,并初步探讨其分子生物学作用机制。方法采用MTT比色法和流式细胞术检测GS对HT-29细胞增殖活力和细胞周期分布的影响;CellDeathELISA和流式细胞术从不同方面检测GS对HT-29细胞凋亡的影响;RT-PCR和Western-blot技术检测GS对核增殖抗原PCNA、bcl-2和baxmRNA和蛋白质表达的影响。结果与对照组相比,在15~120μmol/L浓度范围内,GS能够抑制HT-29细胞增殖活力;降低S细胞分布比例,将细胞周期滞留在G2/M期;显著性诱导HT-29细胞凋亡(>30μmol/L,P<0.05),并呈现出良好的剂量-效应关系。检测GS对PCNA、bcl-2和bax表达的影响显示,GS能够抑制PCNA和bcl-2mRNA和蛋白质表达,对bax的表达则表现出促进作用。结论GS通过诱导HT-29细胞凋亡而抑制其增殖活力,这些效应与PCNA、bcl-2和bax的表达变化有关。这些资料可为结肠癌的早期预防提供膳食干预新途径,并为临床新药的开发提供新方案。     

金雀异黄素诱导人乳腺癌细胞凋亡作用机制研究

目的探讨金雀异黄素对体外培养的人乳腺癌MCF7细胞凋亡的影响及作用机制。方法采用MMT法、凋亡细胞的荧光显微镜、电镜观察和流式细胞仪的检测,观察了不同剂量的金雀异黄素诱导细胞凋亡。同时采用免疫组化法检测凋亡相关基因Bax和癌基因erbB2蛋白的表达。结果通过荧光显微镜和电镜技术观察到凋亡的MCF7细胞。流式细胞仪也检测到了金雀异黄素诱导MCF7细胞产生凋亡,并随着金雀异黄素浓度的增加,细胞凋亡率显著增加。蛋白水平检测表明金雀异黄素促进MCF7细胞Bax表达升高,抑制erbB2表达。结论金雀异黄素可诱导MCF7细胞凋亡,并主要是通过调节Bax和erbB2蛋白表达实现的。     

三羟异黄酮对乳腺癌异种移植瘤血管生成影响

目的 探讨三羟异黄酮(genlstein)对原癌基因(HER-2／neu)高表达乳腺癌血管形成的影响及其与血管内皮生长因子(VEGF)的关系。方法 应用基因转染技术建立HER—2／neu高表达的乳腺癌细胞(MCF—7／HER—2)。免疫缺陷裸鼠(BALB／c)皮下接种乳腺癌(MCF—7和MCF—7／HER—2)细胞，其中接种MCF—7／HER—2细胞的裸鼠随机分为3组：对照组；genistein处理组：HER—2／neu抗体处理组。应用免疫组化法观察移植瘤内微血管密度(microvessel density，MVD)和VEGF的表达变化。结果 MCF—7／HER—2移植瘤与MCF—7移植瘤相比血管密度较大。VEGF表达增强；MCF—7／HER—2移植瘤经genistein和HER—2／neu抗体处理后。移植瘤的血管密度减少，VEGF表达降低。结论 HER—2／neu高表达能促进乳腺癌的血管生成，genistein可能通过下调VEGF的表达从而抑制HER—2／neu高表达乳腺癌的血管生成。     

Rb基因在染料木黄酮抑制人乳腺癌细胞生长中的作用

目的:研究Rb基因在染料木黄酮(genistein,Gen)抑制人乳腺癌细胞MCF-7细胞增殖中的作用。方法:采用MTT实验和集落形成实验观察Gen对人乳腺癌细胞增殖影响,Westernblotting检测Rb基因、细胞周期素cyclinE蛋白表达情况,RT-PCR检测Rb基因mRNA的表达。结果:Gen显著抑制MCF-7细胞生长,促进细胞Rb基因在蛋白及mRNA水平的表达,抑制cyclinE蛋白的表达。结论:Gen抑制人乳腺癌细胞增殖,其机制可能通过上调Rb基因表达,下调cyclinE蛋白表达。     

染料木黄酮对人乳腺癌细胞雌激素样作用机制研究

目的 探讨染料木黄酮(genistein,GEN)对人乳腺癌细胞增殖影响及作用机制.方法 MTT法测定GEN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增殖作用,应用雌激素受体拮抗剂IC1182780观察GEN的雌激素样作用途径,采用流式细胞术分析乳腺癌细胞周期情况.结果 GEN可促进MCF-7细胞的增殖,使G1期向S期转变,增殖作用可被雌激素受体拮抗剂所拮抗;对非雌激素依赖性MDA-MB231细胞增殖无影响.结论 GEN通过雌激素受体(ER)介导而发挥雌激素样活性作用.     

Equol Enhances Apoptosis-inducing Activity of Genistein by Increasing Bax/Bcl-xL Expression Ratio in MCF-7 Human Breast Cancer Cells

Anticancer activities of soy isoflavones, such as genistein and equol, a bioactive metabolite of daidzein, have been extensively studied because of possible involvement in the prevention of breast cancer. However, their interactions still remain unclear. We investigated here whether cytotoxic activity of genistein was enhanced by equol, using estrogen receptor positive MCF-7, HER2-positive SK-BR-3, and triple-negative MDA-MB-468 cell lines. Although cytotoxicity of genistein did not significantly differ between three subtypes of breast cancer cells, cytotoxic activities of genistein were significantly enhanced in combination with 50 μM equol in MCF-7 cells, but not in SK-BR-3 and MDA-MB-468 cells. In fluorescence activated cell sorting (FACS) analyses, MCF-7 cells were arrested at the G2/M by genistein but at G1/S by equol. Combination treatment arrested cells at G2/M but abolished equol-induced G1 block, indicating an antagonistic activity of genistein against equol in cell-cycle progression. Although apoptosis was not so evident with genistein alone, the combination made a drastic induction of apoptosis, accompanied by the increase of Bax/Bcl-xL expression ratio, without affecting the activities of Akt and mTOR. Taken together, these data suggest that enhancement of genistein activity by equol would be mainly mediated by augmented induction of apoptosis rather than arrest or delay of the cell cycle.     

Soy Isoflavone Genistein-Mediated Downregulation of miR-155 Contributes to the Anticancer Effects of Genistein

We previously reported that dietary genistein inhibits mammary tumor growth and metastasis of the highly metastatic MDA-MB-435 cancer cells in immunocompromised mice. The purpose herein was to characterize the role of the novel oncogenic microRNA (miRNA) miR-155 in the anticancer effects of genistein in metastatic breast cancer. The effect of genistein was determined on breast cancer cell viability, apoptosis, and expression of miR-155 and its targets. At low physiologically relevant concentrations, genistein inhibits cell viability and induces apoptosis in metastatic MDA-MB-435 and Hs578t breast cancer cells, without affecting the viability of nonmetastatic MCF-7 breast cancer cells. In parallel with reduced cell viability, miR-155 is downregulated, whereas proapoptotic and anticell proliferative miR-155 targets FOXO3, PTEN, casein kinase, and p27 are upregulated in MDA-MB-435 and Hs578t cells in response to genistein treatment. However, miR-155 levels remain unchanged in response to genistein in the MCF-7 cells. Ectopic expression of miR-155 in MDA-MB-435 and Hs578t cells decreases the effects of genistein on cell viability and abrogates the effects of genistein on apoptosis and expression of proapoptotic genes. Therefore, genistein-mediated downregulation of miR-155 contributes to the anticancer effects of genistein in metastatic breast cancer.     

Anticancer activities of pomegranate extracts and genistein in human breast cancer cells

Previous studies have demonstrated the anticarcinogenic activity of pomegranate extracts and genistein in a series of human cancer cells. In the present study, the potential anticancer effects of pomegranate extracts and genistein on inhibition of cell proliferation and induction of apoptosis in human breast cancer cells was investigated. Human breast cancer cells (MCF-7) were cultured as monolayers in complete RPMI 1640 medium. The cells were cultured for 48 hours to allow growth and achieve about 80% confluence in 48-well culture plates, and then exposed to the agents for 24 hours in single and combination treatments. Post-treatment growth rate and apoptosis induction were assessed by the use of a series of bioassays-lactate dehydrogenase and 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (inner salt) for viability and cytotoxicity; acridine orange-ethidium bromide and terminal deoxyribonucleotidyl transferase-mediated dUTP nick-end labeling assays for induction of apoptosis. Both pomegranate extracts and genistein had significant (dose- and time-dependent) cytotoxic and growth inhibition effects on MCF-7 cancer cells. Both growth inhibition and cytotoxicity were significantly higher (P < .01) in the combination treatments than in the single treatments with either agent. The data revealed that both drugs in single and in combination treatments induced apoptosis in MCF-7 cells. Apoptotic induction in the combination treatments was significantly higher (P < .01) than in single treatments. Both pomegranate extracts and genistein inhibit the growth of MCF-7 breast cancer cells through induction of apoptosis, with combination treatment being more efficacious than single treatments.     

A comparative study of growth-inhibitory effects of isoflavones and their metabolites on human breast and prostate cancer cell lines

The possible growth-inhibitory properties of the recently synthesized novel metabolite 1-(2,4-dihydrobenzoyl)-1-(4-hydroxyphenyl)ethylene (2-de-O-DMA) and six other metabolites of isoflavones were investigated and compared with those of the major isoflavones genistein, daidzein, and glycitein on human breast noncancer and breast and prostate cancer cell lines in vitro. The novel metabolite 2-de-O-DMA was found to be a more potent inhibitor than genistein on human breast cancer MCF-7, MDA-MB-468, and SK-BR-3 cells and breast noncancer MCF-10A cells. In prostate cancer cell lines, LNCaP and DU145, 2-de-O-DMA elicited a six- to sevenfold more potent inhibition than genistein. Flow cytometric analysis showed that 2-de-O-DMA and genistein blocked cells at the G2/M phase of the cell cycle. Genistein and 2-de-O-DMA led to apoptosis of a variety of cancer cell lines. The rapid response of growth inhibition induced by 2-de-O-DMA compared with genistein strongly suggests that the observed antiproliferation effects elicited by this novel metabolite are mediated via a biological pathway different from that induced by genistein. 2-de-O-DMA, a novel metabolite of isoflavone, could have a potential role in chemopreventive and chemotherapeutic treatment of hormonal breast and prostate cancers.     

葡多酚对人乳腺癌细胞增殖的抑制作用研究

目的研究葡多酚(GPC)对人乳腺癌(MCF-7)细胞增殖活性的影响及雌激素受体(ER)的调节作用。方法将GPC与MCF-7细胞共同培养,共设肿瘤细胞对照组、高、中、低(200、100、10μg/ml)剂量GPC组、ER阻断剂对照组(ICI10-6mol/L)和ER阻断剂(ICI10-6mol/L)+GPC(200μg/ml)6个组。用MTT法测定各组乳腺癌细胞的增殖活性水平,用免疫组化方法检测乳腺癌细胞中增殖细胞核抗原(PCNA)和Bax蛋白的表达水平。结果与肿瘤细胞对照组比,高剂量GPC组乳腺癌细胞的增殖活性水平和PCNA阳性表达率降低,Bax蛋白阳性表达率升高(P<0.05);ER阻断剂+GPC组乳腺癌细胞的增殖活性水平、PCNA阳性表达率,均较高剂量GPC组升高,Bax蛋白阳性表达率降低,各项差别均有显著性意义(P<0.05)。结论GPC可有效抑制人乳腺癌细胞的增殖,并促进其凋亡;其作用与ER调节有密切关系。     

大豆异黄酮抑制人乳腺癌细胞生长及作用机制研究

采用体外细胞培养的方法 ,探讨大豆异黄酮对体外培养的人乳腺癌MCF - 7细胞生长的作用及作用机制。结果表明 ,大豆异黄酮抑制MCF - 7细胞生长 ,诱导MCF - 7细胞凋亡。蛋白水平检测表明大豆异黄酮可使MCF - 7细胞iNOS表达升高。结果提示大豆异黄酮抑制MCF - 7细胞生长 ,诱导细胞凋亡 ,并主要是通过调节iNOS基因表达实现的