大豆异黄酮诱导HeLa细胞凋亡、细胞周期阻滞和[Ca~(2+)]_i浓度升高(英文)

目的探讨大豆异黄酮SI-I抑制HeLa细胞生长机制。方法 HeLa细胞经过10,20,and 40 g/ml的大豆异黄酮SI-I处理4d后,采用倒置显微镜和透射电镜观察其形态学变化,利用流式细胞仪检测细胞周期分布,通过激光扫描共聚焦显微镜观察细胞中[Ca2+]i浓度。结果倒置显微镜观察到HeLa细胞数量明显变少,细胞严重变形。透射电镜观察到HeLa细胞发生凋亡形态学变化。流式细胞仪分析发现HeLa细胞周期阻滞于G0/G1或G2/M期,细胞凋亡率随SI-I浓度的增加而上升。激光扫描共聚焦显微镜观察到凋亡的HeLa细胞内[Ca2+]i显著升高。结论大豆异黄酮SI-I抑制HeLa细胞生长是通过凋亡诱导作用,并且细胞周期阻滞和[Ca2+]i浓度升高可能是其诱导凋亡机制之一。[营养学报,2012,34(4):373-378]     

三羟异黄酮对乳腺癌细胞系MCF-7生长的影响

目的探讨三羟异黄酮(Genistein)对乳腺癌细胞系MCF-7的生长、细胞周期及诱导细胞凋亡的影响。方法培养MCF-7细胞,在其对数生长期加入三羟异黄酮,通过MTT试验,流式细胞仪技术及Giemsa染色法,观察三羟异黄酮对MCF-7生长的影响。结果(1)MTT试验显示,细胞培养第1天,三羟异黄酮20、40、80、160μmol.L-14个剂量组的吸光度值(该值反映对MCF-7细胞生长的抑制作用)分别为0.460±0.018、0.450±0.020、0.440±0.020、0.385±0.040,明显低于对照组(0.520±0.023,P<0.05),第2、3、4天的变化趋势相同于第1天。(2)三羟异黄酮80、160μmol.L-12个剂量组的细胞周期G2%分别为50.0%、57.5%,而对照组为6.8%。(3)三羟异黄酮10、80μmol.L-12个剂量组晚期细胞凋亡率分别为6.51%、20.03%,而对照组为0.50%。结论三羟异黄酮对MCF-7的生长有明显的抑制作用;能阻滞细胞周期的正常进行,但主要在细胞周期的后期(G2期)发挥作用;能诱导细胞凋亡。     

家蝇幼虫抗菌蛋白诱导黑色素瘤A375细胞凋亡的探讨

目的 观察家蝇幼虫抗菌蛋白对黑色素瘤A375细胞凋亡的诱导，探讨其抗肿瘤作用机制。方法 流式细胞仪测定家蝇幼虫抗菌蛋白对细胞周期和细胞凋亡的影响；HE染色法观察细胞凋亡形态，并测定细胞凋亡指数（AI）。结果 在0．10％组A375的G／M期升高，S期降低。0．50％组G0／G1期、G2／M期和AI／PI（增殖指数）显著增加，S期及PI明显减少。2．50％组S期、PI、AI／PI及细胞凋亡率（Ap）显著增高，G0／G1期大大减少。12．50％组G2／M期、PI、AI／PI及Ap显著增高，G0／G1期和S期明显下降。结论 家蝇幼虫抗菌蛋白对黑色素瘤A375细胞有明显的抑杀作用；家蝇幼虫抗菌物质可能系通过细胞周期阻滞以及诱导细胞凋亡而抑制黑色素瘤A375细胞生长。     

营养

012749大豆异黄酮抑制BCap一37乳腺癌细胞增殖的作用研究/杨镇洲…//中国公共卫生.一2000,16(10).一913～914 采用二羟异黄酮、三羟异黄酮处理BCap一37细胞1～4d后,以生长曲线、。H—TdR掺入试验反映其增殖活力,用流式细胞仪检测其对细胞周期的影响。结果显示:l～9×10。mol/L三羟异黄酮处理BCap一37细胞3～4d后,对BCap一37细胞有增殖抑制作用,且与剂量及培养时间成正相关,而在相同剂量条件下二羟异黄酮对BCap一37细胞生长无抑制作用。三羟异黄酮处理BCap一37细胞4d后,BCap一37细胞的增殖指数明显下降,细胞主要阻滞于G。期。提示:三…     

苦参碱诱导人喉癌细胞Hep-2凋亡的实验研究

目的 研究苦参碱对人喉癌细胞Hep-2的生长抑制作用及凋亡机制.结果 四甲基噻唑蓝(MTT)法测定苦参碱对细胞的抑制作用,荧光显微镜、DNA琼脂糖凝胶电泳、流式细胞仪技术(FCM)观察细胞周期及凋亡.结果 不同浓度苦参碱对Hep-2细胞有明显抑制作用,且呈时间依赖性及剂量依赖性;FCM检测结果 显示:S期细胞比例及凋亡率增高,G2/M期细胞比例下降,且呈剂量依赖性;形态学发现Hep-2细胞染色质凝聚,核碎裂,凋亡小体形成;DNA琼脂糖凝胶电泳显示典型的梯形条带.结论 苦参碱可能是通过将人喉癌细胞周期阻滞在S期,诱导喉癌细胞凋亡,抑制其增殖,发挥其抗癌功能.     

选择性COX-2抑制剂对大肠癌细胞生长的影响

目的　观察塞来昔布对大肠癌细胞株HT -2 9细胞增殖和凋亡的影响 ,为治疗结肠癌寻找安全有效的化疗药物。方法　采用噻唑蓝 (MTT)比色法 ,流式细胞仪 (FCM)、吖啶橙 /溴化乙啶染色结合荧光显微镜等技术 ,研究塞来昔布对HT -2 9细胞增殖和凋亡的影响。结果　MTT比色法显示体外塞来昔布抑制HT -2 9细胞生长 ,呈浓度和时间依赖性。FCM结果显示典型的亚二倍体“凋亡峰” ,凋亡率在 ( 7 3 1± 2 3 7) %～ ( 4 8 3± 2 86) %;使G0 /G1 期细胞比例升高 ,S期和G2 /M期比例下降 ,呈一定剂量依赖关系。荧光显微镜下见典型的凋亡形态学改变 :细胞体积缩小、细胞核固缩、凋亡小体形成等。凋亡比例呈剂量和时间依赖。结论　体外塞来昔布抑制HT -2 9细胞增殖 ,并诱导细胞凋亡。这种作用可能与阻止细胞周期进展有关     

染料木质素对人乳腺癌细胞BCaP-37凋亡的诱导作用

采用荧光显微镜观察了染料木质素诱导体外培养的人体乳腺髓样癌细胞株BCaP 37凋亡的形态学特征 ,并用流式细胞仪检测了染料木质素对乳腺癌细胞株细胞周期、凋亡率和bcl 2基因表达的影响。结果显示经丫啶橙染色后 ,荧光显微镜下可见到乳腺癌细胞出现细胞凋亡的特征性形态学改变 ;染料木质素能阻断细胞由G1 期向S期移行 ,使G0 -G1 期细胞数目明显增多 ,并能诱导细胞发生凋亡 ,呈现剂量 效应关系 ;bcl 2基因表达量与染料木质素浓度呈负相关。故染料木质素可通过抑制bcl 2蛋白表达诱导细胞凋亡     

硫酸镍致雌性小鼠卵巢损伤作用

目的探讨硫酸镍致小鼠卵巢细胞凋亡的毒作用及其机制，为防治镍毒性导致的卵巢早衰提供科学依据。方法健康昆明种雌性小鼠以每次以10．0，5．0，2．5mg/kg硫酸镍（NiS04）腹腔注射染毒，0．2ml／（10g·bw），1次／d，连续12d。阴道脱落细胞学观察动情周期。摘取小鼠卵巢，制备卵巢贴片观察卵巢细胞的形态学变化，并利用流式细胞仪测定卵巢细胞细胞周期及DNA含量。结果（1）染毒组小鼠动情间期延长且不规则。（2）光学显微镜可观察到细胞凋亡的形态学变化。（3）细胞周期分析显示随染毒剂量增加，小鼠卵巢细胞呈现G0／G1期细胞阻滞且G1峰前出现Ap峰（凋亡峰。亚二倍体峰），G2／M、S期细胞比例下降；细胞凋亡率增加；细胞增殖指数（PI）降低；异倍体指数（DI）增加。结论腹腔注射硫酸镍可导致雌性小鼠卵巢损伤，其损伤作用与NiS04调控细胞周期和诱导卵巢细胞凋亡有关。     

大豆苷原对体外培养人胃癌细胞增殖和细胞周期的影响

目的:了解二羟异黄酮对胃癌细胞有无促增殖与诱导凋亡作用。方法:以不同浓度的二羟异黄酮处理人胃癌细胞系MGC-803细胞。然后分别用MTT法测定细胞增殖情况、流式细胞仪和琼脂糖凝胶电泳测定细胞周期和细胞凋亡等。结果:MTT 结果显示:二羟异黄酮对胃癌细胞具有促进和抑制增殖的双相作用-在低浓度(0.1-1 μmol/L)时促进细胞生长,在较高浓度(10-100 μmol/L)时对细胞生长则有抑制作用。流式细胞术结果显示:癌细胞群阻滞在G1期,没有明显凋亡峰的出现;凝胶电泳也末检测到明显的DNA阶梯状条带。结论:二羟异黄酮对体外培养的胃癌细胞的生长有双相作用,较高浓度可抑制胃癌细胞的生长并使细胞阻滞在G1期,而无诱导细胞凋亡的作用。     

高温联合化疗药对人乳腺癌细胞杀伤作用研究

目的:探讨高温联合化疗药物诱导人乳腺癌细胞株(MDA-MB-435S)凋亡和细胞周期各时相变化的分子机理。方法:应用43℃水浴箱高温诱导MDA-MB-435S细胞株,并联合使用5-Fu进行细胞杀伤,通过MTT比色法和流式细胞仪检测细胞凋亡率和细胞周期各时相的变化。结果;高温组、高温联合5-Fu组细胞凋亡率及细胞周期时相变化与对照组差异显著(P<0.01)。结论:高温联合5-Fu可提高乳腺癌细胞凋亡率、可抑制乳腺细胞周期G1期向S期的进程,S期细胞减少、G2M期细胞相对增高。     

Genistein-induced cell cycle arrest and apoptosis in a head and neck squamous cell carcinoma cell line.

Epidemiological studies have shown a lower incidence of breast, prostate, and colon cancers in Asian countries, particularly China and Japan, than in the United States. It is believed that genistein, a natural tyrosine kinase inhibitor and a metabolite of soy products, may be responsible for the protection from these cancers. Genistein was shown to inhibit cell proliferation and to induce cell cycle arrest at the G2-M phase in breast, prostate, and jurkat T cell leukemia cell lines. However, such studies have not been reported in squamous cell cancers of the head and neck. In this report, we show that genistein inhibits proliferation of a squamous cell carcinoma cell line HN4. Additionally, genistein caused cell cycle arrest at the S/G2-M phase and induced programmed cell death (apoptosis) in these cells. These effects appear to be dose and time dependent, irreversible, persisting when the cells were recultured in genistein-free medium for up to 72 hours, and specific for tumor cells, because genistein did not affect normal keratinocytes. These results suggest that if genistein shows similar results in clinical trials, it can be a potential chemopreventive/chemotherapeutic agent for cancers of the head and neck.     

三羟异黄酮对人乳腺癌细胞外调节激酶影响

目的探讨三羟异黄酮（genistein）对人乳腺癌细胞株MDA-MB-231细胞外调节激酶1/2（ERK1/2）MAPK信号转导通路的影响.方法采用四甲基偶氮噻唑蓝（MTT）比色法分别检测三羟异黄酮以及与ERK1/2上游激酶MEK1/2抑制剂联合作用时对MDA-MB-231增殖的抑制作用;应用Western blot蛋白免疫印记法分别检测ERK1/2总蛋白、c-Jun、c-Fos蛋白的表达.结果 MTT结果显示,与对照组相比,三羟异黄酮作用48h后,细胞存活度随浓度增加而降低,合用MEK1/2抑制剂细胞存活度最低;Western blot分析提示,随三羟异黄酮剂量的增加,ERK1/2、c-Jun、c-Fos蛋白表达增加,但合用抑制剂后蛋白表达降低.结论三羟异黄酮可以抑制MDA-MB-231细胞增殖,并激活了ERK1/2 MAPK信号转导通路;MEK1/2抑制剂可以抑制三羟异黄酮介导的ERK1/2活化,同时提高三羟异黄酮的肿瘤抑制作用.     

Caffeine overcomes genistein-induced G2/M cell cycle arrest in breast cancer cells

Although inhibition of tumor cell growth by genistein is mediated by different types of cell cycle arrest, its regulation of genes related to the cell cycle is not clear. In this study, genistein caused a concentration-dependent growth inhibition in the hormone-independent cell line MDA-MB-435S. Flow cytometric analysis showed that genistein induced a concentration-dependent accumulation of cells in the G2/M phase of the cell cycle. Caffeine enhanced the inhibition of cell proliferation induced by genistein. Caffeine alone did not have an appreciable effect on the phases of the cell cycle, but caffeine at 3 mM completely eliminated genistein-induced G2/M cell cycle arrest. cDNA microarrays were used to investigate the mechanism of genistein-induced, caffeine-negated G2/M arrest. We identified 12 genes, which had opposite responses to genistein and caffeine treatments. Among these, 5 genes were upregulated by genistein and downregulated by caffeine; 7 genes were downregulated by genistein and upregulated by caffeine. Reversal by caffeine of genistein-induced G2/M phase arrest in breast cancer cell lines could increase their sensitivity to genistein and enhance genistein-induced inhibition of cell growth. Genes that have opposite responses to genistein and caffeine may be involved in regulation of the G2/M phase of the cell cycle.     

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.     

Caffeine Overcomes Genistein-Induced G2/M Cell Cycle Arrest in Breast Cancer Cells

Although inhibition of tumor cell growth by genistein is mediated by different types of cell cycle arrest, its regulation of genes related to the cell cycle is not clear. In this study, genistein caused a concentration-dependent growth inhibition in the hormone-independent cell line MDA-MB-435S. Flow cytometric analysis showed that genistein induced a concentration-dependent accumulation of cells in the G2/M phase of the cell cycle. Caffeine enhanced the inhibition of cell proliferation induced by genistein. Caffeine alone did not have an appreciable effect on the phases of the cell cycle, but caffeine at 3 mM completely eliminated genistein-induced G2/M cell cycle arrest. cDNA microarrays were used to investigate the mechanism of genistein-induced, caffeine-negated G2/M arrest. We identified 12 genes, which had opposite responses to genistein and caffeine treatments. Among these, 5 genes were upregulated by genistein and downregulated by caffeine; 7 genes were downregulated by genistein and upregulated by caffeine. Reversal by caffeine of genistein-induced G2/M phase arrest in breast cancer cell lines could increase their sensitivity to genistein and enhance genistein-induced inhibition of cell growth. Genes that have opposite responses to genistein and caffeine may be involved in regulation of the G2/M phase 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.     

ERK5MAPK在genistein对MDA-MB-231细胞增殖抑制中的作用

目的探讨ERK5(extracellular-regulated kinase5)MAPK(mitogen-activated protein kinase)信号转导通路与genistein对人乳腺癌细胞MDA-MB-231增殖抑制作用的关系。方法采用噻唑蓝(MTT)比色法检测genistein对MDA-MB-231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ERK5总蛋白和凋亡相关蛋白Bax、Caspase3的表达。结果genistein对MDA-MB-231细胞增殖有明显的抑制作用;流式细胞仪检测到细胞产生凋亡;western blot分析提示genistein抑制ERK5总蛋白的表达,促进Bax和Caspase3蛋白表达。结论genistein可以影响ERK5MAPK信号转导通路,使凋亡相关蛋白表达增加,抑制MDA-MB-231细胞增殖。     

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。