异黄酮类植物雌激素通过雌激素受体对靶基因的转录调节作用

目的:观察异黄酮类植物雌激素染料木素和大豆苷元通过雌激素受体(estrogen receptor,ER)对靶基因的转录调节作用。方法:采用磷酸钙瞬时转染的方法,利用转染雌激素受体表达质粒的Hela细胞,观察染料木素和大豆苷元对雌激素反应元件(estrogen response element,ERE)报告基因的转录激活作用;此外还观察ER拮抗剂ICI 182780对这两种植物雌激素转录激活作用的影响。结果:染料木素和大豆苷元均可通过ER的两种亚型ERα和ERβ激活ERE报告基因的转录,且这种转录激活作用能被ICI 182780所阻断。结论:染料木素和大豆苷元均能产生类雌激素样作用,通过ERα和ERβ激活ER靶基因的转录。     

金雀黄素对子宫内膜癌细胞Erα和ERβmRNA水平的调节

目的:研究金雀黄素对子宫内膜癌细胞ERα,ERβ mRNA的调节作用,探讨植物雌激素对子宫内膜癌的作用机制,为临床应用植物雌激素提供理论依据.方法:体外培养子宫内膜癌细胞系Ishikawa,采用实时荧光定量RT-PCR方法,观察不同剂量金雀黄素对两种雌激素亚型表达的影响,阳性对照为雌二醇、孕酮作用组.结果:(1)低剂量金雀黄素能提高子宫内膜癌细胞ERα mRNA表达,但其作用较雌二醇明显弱;低剂量金雀黄素能降低ERβ mRNA的表达,而雌二醇对ERβ mRNA作用不明显.(2)高剂量金雀黄素的作用与孕酮相似,能下调子宫内膜癌细胞ERα mRNA和ERβ mRNA表达,但较孕酮作用弱.结论:金雀黄素对子宫内膜癌细胞ERα mRNA和ERβ mRNA的表达作用不同,而且与其剂量有一定关系.推测金雀黄素有雌激素受体调节剂的作用.     

雄激素依赖性和非依赖性前列腺癌雄激素受体表达水平的变化

目的:从雄激素受体表达水平变化的角度,探讨雄激素依赖性前列腺癌向雄激素非依赖性前列腺癌转化的可能机理。方法:体外培养雄激素依赖性前列腺癌细胞株(LNCaP细胞)和雄激素非依赖性前列腺癌细胞株(PC-3细胞),应用流式细胞术测定两种细胞株在生理盐水和二氢睾酮(DHT)作用下雄激素受体(AR)的表达水平。结果:两种细胞株均有AR表达,两种条件下AR的表达水平分别为:LNCaP细胞生理盐水处理组85.99±4.97,DHT处理组93.74±3.63;PC-3细胞生理盐水处理组8.52±1.57,DHT处理组9.52±1.75,两种条件下LNCaP细胞的AR表达水平均高于相应条件下PC-3细胞的AR表达水平,两者有显著性差异(P<0.05)。DHT作用下LNCaP细胞的AR表达水平显著高于生理盐水作用下LNCaP细胞的AR表达水平(P<0.05);DHT作用下PC-3细胞的AR表达水平与生理盐水作用下PC-3细胞的AR表达水平无显著性差异(P>0.05)。结论:雄激素依赖性前列腺癌细胞过表达AR,并且二氢睾酮能促进其表达AR;雄激素非依赖性前列腺癌细胞AR表达较少,二氢睾酮对其AR表达无明显作用,雄激素依赖性前列腺癌向雄激素非依赖性前列腺癌转化可能与前列腺癌雄激素受体表达水平下降有关。     

大豆异黄酮激活PPARγ促进人前列腺癌DU-145细胞凋亡

目的探讨染料异黄酮(genistein,GEN)和大豆苷元(daidzein,DAI)对人前列腺癌DU-145细胞凋亡的影响及其与过氧化物酶体增殖物激活体受体γ(peroxisome proliferators-activated receptorγ,PPARγ)的关系。方法采用过氧化物酶体增殖物反应元件(peroxisome proliferator responsive element,PPRE)驱动的荧光素酶报告基因检测GEN、DAI对DU-145细胞PPARγ的激活作用;GEN、DAI单独或联合PPARγ选择性拮抗剂GW9662处理DU-145细胞,采用免疫荧光化学染色方法观察PPARγ定位分布变化;TUNEL法和AnnexinⅤ/PI双染色流式细胞术检测细胞凋亡的变化。结果 GEN、DAI明显增强转染PPRE-TK-Luc质粒的DU-145细胞中荧光素酶表达活性,且这种作用可被GW9662所逆转。GEN或DAI单独作用于DU-145细胞时,PPARγ发生核移位;细胞凋亡率明显增加(P<0.05)。GW9662分别与GEN或DAI联合作用时,GEN、DAI促进PPARγ核移位和诱导细胞凋亡的作用明显削弱(P<0.05)。结论大豆异黄酮可通过激活PPARγ信号途径,促进人前列腺癌DU-145细胞凋亡。     

促性腺激素释放激素激动剂对卵巢癌大鼠化疗效果的影响

目的 研究促性腺激素释放激素激动剂(GnRHa)对大鼠卵巢组织中雌激素受体α(ERa),ERB,孕激素受体(PR)和雄激素受体(AR)的表达的影响以及对环磷酰胺在卵巢癌大鼠模型中治疗效果的影响。方法 (1)80只Fischer-344大鼠分为4组,分别接受生理盐水、环磷酰胺((3TX)、GnRHa和CTX GnRHa治疗,采用免疫组化和逆转录-聚合酶链反应(RT-PCR)的方法比较各组大鼠卵巢组织中ERα,ERB,PR和AR的表达水平;(2)使用NuTu-19卵巢癌细胞系在20只Fischer-344大鼠上建立卵巢癌模型,分为3组,分别接受生理盐水、CTX和CTX GnRHa治疗,比较各组大鼠的生存时间。结果(1)4组大鼠卵巢组织中ERct、ERβ、PR、AR mRNA强度分别为0．24～0．29、1．13～1．35、0．68～0．88、1．39～1．63,免疫组化评分结果分别为4．7～5．1、15．1～15．5、8．5～9．1、17．9～19．0,各组大鼠的受体表达水平差异没有统计学意义;(2)(3TX组和联合治疗组大鼠的生存时间分别为76．0d和79．6d,两者差异没有统计学意义。结论 在大鼠模型中应用GnRHa的过程中不会改变大鼠卵巢组织中ERα、ERβ、PR、AR的表达水平,也不会影响CTX对卵巢癌大鼠模型的治疗效果。     

染料木素和大豆黄素对海马神经细胞H19-7增殖和神经营养因子表达的影响

目的 探讨染料木素和大豆黄素对海马神经细胞的活性和增殖作用及其可能机制.方法 H19-7/IGF-IR神经细胞在无酚红无血清DMEM培养液中培养72h后,分别加入一定浓度的染料木素、大豆黄素和雌二醇,用MTT和BrdU法分别检测细胞的活性和增殖,流式细胞术检测神经细胞周期,ELISA和RT-PCR法检测脑源性神经营养因子(BDNF)的表达.结果 处理细胞72h后,与对照组相比,20nM、200 Nm雌激素组H19-7细胞增殖分别提高了33%、36%;20 Nm、200 Nm染料木素组H19-7细胞增殖分别提高了15%、13%;200nM大豆黄素组H19-7细胞增殖分别提高了11%,差异有显著性(P＜0.05).200nM染料木素和大豆黄素的S期细胞比例[分别为(17.64±0.43)%,(19.48±1.01)%]显著高于对照组(14.21 ± 1.75)%,差异具有显著性(P＜0.05).染料木素和大豆黄素显著增加海马神经细胞成熟型BDNF水平及其Mrna的表达(P＜0.05).酪氨酸激酶受体阻断剂K252a能阻断染料木素和大豆黄素的促海马神经细胞增殖作用.结论 染料木素和大豆黄素改善海马神经细胞的增殖和活性能力,其作用与促进海马细胞BDNF的表达有关.

Abstract：

Objective To determine the effects of genistein and daidzein on the proliferation and survival of the hippocampal neural cells and underlying mechanism. Methods H19-7/IGF-IR neural cell line was cultured in phenol red free DMEM absented of serum for 72h. Genistein, daidzein or 17β-estradiol was added to the culture at various concentrations. Their proliferation and protective effects on the neuronal cells were determined by BrdU and MTT assay respectively. The effect of phytoestrogens on cell cycle regulation was determined using flow cytometry. The effects of the soy isoflavones on brain-derived neurotrophic factor (BDNF) expression were determined by ELISA and RT-PCR respectively. Results It was observed that, with 72h of treatment, 20nM and 200 nM 17B-estradiol significantly promoted the neuronal cell proliferation at 33% and 36% ;20nM and 200nM genistein significantly promoted the neuronal cell proliferation at 15% and 13% ; 200nM daidzein significantly promoted the neuronal cell proliferation at 11% compared to the control (P＜0.05). Genistein and daidzein induced an significantly increase in the S phase arrest at (17.64 ± 0.43) % and (19.48 ± 1.01) % compared to the control (P ＜ 0. 05). Moreover, genistein and daidzein significantly increased the expression of mature BDNF and BDNF mRNA level (P＜0.05). The effect of genistein and daidzein on hippocampal neuronal cell proliferation was blocked by K252a, selective inhibitor of tyrosine kinase receptors. Conclusion Genistein and daidzein improved hippocampal neuronal cell proliferation and viability in vitro. The effects might be mediated by increasing in BDNF expression.     

染料木素和大豆黄素对海马神经细胞H19—7增殖和神经营养因子表达的影响

目的 探讨染料木素和大豆黄素对海马神经细胞的活性和增殖作用及其可能机制.方法 H19-7/IGF-IR神经细胞在无酚红无血清DMEM培养液中培养72h后,分别加入一定浓度的染料木素、大豆黄素和雌二醇,用MTT和BrdU法分别检测细胞的活性和增殖,流式细胞术检测神经细胞周期,ELISA和RT-PCR法检测脑源性神经营养因子（BDNF）的表达.结果 处理细胞72h后,与对照组相比,20nM、200 Nm雌激素组H19-7细胞增殖分别提高了33%、36%;20 Nm、200 Nm染料木素组H19-7细胞增殖分别提高了15%、13%;200nM大豆黄素组H19-7细胞增殖分别提高了11%,差异有显著性（P＜0.05）.200nM染料木素和大豆黄素的S期细胞比例[分别为（17.64±0.43）%,（19.48±1.01）%]显著高于对照组（14.21 ± 1.75）%,差异具有显著性（P＜0.05）.染料木素和大豆黄素显著增加海马神经细胞成熟型BDNF水平及其Mrna的表达（P＜0.05）.酪氨酸激酶受体阻断剂K252a能阻断染料木素和大豆黄素的促海马神经细胞增殖作用.结论 染料木素和大豆黄素改善海马神经细胞的增殖和活性能力,其作用与促进海马细胞BDNF的表达有关.     

Role of phosphatase PTEN in the activation of extracellular signal-regulated kinases induced by estradiol in endometrial carcinoma cells

Objectives To study extracellular signal-regulated kinase (ERK) activation in the endometrial carcinoma cell line Ishikawa with stimulation by 17-β-estradiol, and to elucidate the role of phosphatase and tensin homologue (PTEN) and estrogen receptor (ER) subtype on the activation of ERKs. Methods Western blot was used to examine the expression of PTEN and PTEN (G129E) in Ishikawa cells after stable transfection as well as ERK activation in Ishikawa-EGFP, Ishikawa- PTEN and Ishikawa- PTEN (G129E) stimulated with various doses of 17-β-estradiol for different lengths of time. Western blot was also used for examining the expression of ERα and ERβ in NIH3T3 fibroblasts after transient transfection of pCXN2hERα and pCXN2hERβ. Then, ERK activation was examined after stimulation with 17-β-estradiol. Results 17-β-estradiol activated ERK cascades (mainly ERK2) in Ishikawa cells. The activation of ERK increased gradually as concentration of 17-β-estradiol also increased. The maximal activation of ERK2 took place 5 min after stimulation with 17-β-estradiol. The activation of ERK2 was inhibited markedly by PTEN, but not by PTEN (G129E). 17-β-estradiol activated ERK cascades in NIH3T3 fibroblasts after transient transfection of pCXN2hERα. Conclusions 17-β-estradiol activate ERK cascades in Ishikawa cells by integrating with ERα. Lipid phosphatase PTEN has an inhibitory role on the activation of ERK stimulated by 17-β-estradiol in Ishikawa cells.     

大豆异黄酮抑制Bcap-37细胞增殖与TGF-β关系的研究

目的　探讨大豆异黄酮抑制Bcap-37人乳腺癌细胞增殖时TGF-β和TGF-β受体表达的改变。方法　以二羟异黄酮、三羟异黄酮处理Bcap-37细胞,采用TGF-β拮抗试验、免疫细胞化学和逆转录聚合酶链式反应等实验方法,检测大豆异黄酮作用后Bcap-37人乳腺癌细胞TGF-β1、TGF-β2及受体表达的变化。结果　3×10-5 mol/L三羟异黄酮作用后Bcap-37细胞TGF-β1、TGF-β2及受体表达增强,而二羟异黄酮处理组其表达无明显改变。结论　三羟异黄酮抑制Bcap-37细胞增殖同时伴有TGF-β1、TGF-β2及受体表达增强。     

前列腺癌中EphA1基因表达的初步研究

目的:检测前列腺癌中EphA1基因转录及受体表达水平,探讨其表达异常的机制及其临床意义。方法:利用RT-PCR法检测雄激素依赖性前列腺癌细胞系LNCaP和雄激素非依赖性前列腺癌细胞系PC-3中EphA1基因mRNA表达情况,采用甲基化特异性PCR(MSP)方法进行甲基化状态分析;用免疫组化方法检测19例前列腺癌和22例良性前列腺组织标本中EphA1受体表达情况。结果:LNCaP和PC-3细胞中均未检测到EphA1基因转录;PC-3细胞中EphA1基因启动子区内CpG岛存在高甲基化现象,而LNCaP细胞则不存在;前列腺癌和良性前列腺增生组织中EphA1受体表达率分别为36.8%和45.5%,其差异无统计学意义(P>0.05)。结论:前列腺癌细胞LNCaP和PC-3中无明显EphA1基因表达,甲基化可能是导致该基因下调的机制之一。EphA1基因的甲基化在前列腺癌进展及由雄激素依赖向雄激素非依赖转化过程中可能发挥一定作用。     

抑癌PTEN基因联合p53基因转染对前列腺癌PC-3m细胞凋亡的影响

目的研究抑癌PTEN基因联合p53基因转染对前列腺癌PC-3m细胞凋亡的影响。方法构建表达载体：空质粒pEGFP—N1、pEGFP—N1-PTEN质粒、pEGFP—N1-p53质粒及pEGFP—N1-PTEN—p53质粒,体外分别转染到前列腺癌Pc-3m细胞中,观察它们转染后的荧光表达情况;采用RT—PCR法检测目的基因表达;Westernblotting法检测目的PTEN蛋白和P53蛋白的表达;用MTT法观察细胞增殖抑制情况并绘制生长抑制曲线;AnnexinV—FITC／PI双染流式细胞术检测PTEN基因和p53基因对前列腺癌PC-3m细胞凋亡的影响。结果荧光显微镜下观察到PTEN、p53及两个基因同时在PC-3m细胞系中成功表达;RT—PCR检测结果显示,与PTEN基因单转染组、p53基因单转染组和空载体转染组相比联合转染组mRNA在PC-3m细胞系中表达明显增加俨〈0．05）;Westernblotting法检测同样发现,联合转染组PTEN蛋白及P53蛋白表达明显高于PTEN基因单转染组、p53基因单转染组和空载体转染组俨〈0．05）;联合转染组细胞凋亡率明显高于空载体转染组、PTEN基因单转染组和p53基因单转染组（P〈0．05）。结论PTEN基因与p53基因联合转染能诱导前列腺癌PC-3m细胞凋亡．这种联合转染可能对前列腺癌的基因治疗具有潜在的应用价值。     

雄激素受体对IgG蛋白表达及前列腺癌细胞增殖和迁移的影响

目的 研究前列腺癌细胞中雄激素受体(AR)对免疫球蛋白lgG表达的影响,及对前列腺癌细胞增殖、迁移的作用.方法 (1)Western blot检测雄激素依赖性前列腺癌细胞株LNCap与去势抵抗性前列腺癌细胞株PC-3中AR、IgG蛋白的表达;(2)AR基因(pCDNA3.1+)转染PC-3构建AR过表达的PC-3-AR细胞,沉默LNCap中AR基因表达构建LNCap-siAR细胞;Westernblot检测AR及IgG表达量;Q-PCR检测细胞株中IgG mRNA表达量;四氮甲基唑氮、细胞划痕方法检测细胞的增殖及迁移能力.结果 LNCap细胞与PC-3细胞相比较,AR高表达,IgG低表达(P＜0.05).PC-3-AR细胞lgG降低表达(P＜0.01),细胞增殖及迁移能力减弱;LNCap-siAR细胞IgG增高表达(P＜0.01),细胞增殖及迁移能力增强.结论 AR调控IgG蛋白表达呈负相关并与前列腺癌细胞增殖、迁移能力相关.     

PTEN增强溶瘤腺病毒对前列腺癌细胞的特异性杀伤作用

目的研究由survivin启动子调控、携带抑癌基因PTEN的条件复制型重组腺病毒对前列腺癌细胞的杀伤作用。方法构建含有survivin启动子和PTEN基因的重组腺病毒reADGL3BSurvPTEN,感染前列腺癌细胞系和正常前列腺上皮细胞系。利用Western blot检测病毒感染前后前列腺癌细胞中PTEN的表达变化,CCK-8法及流式细胞学检测重组腺病毒对前列腺癌细胞生长及凋亡的影响。结果 PCR结果证实成功构建了含有survivin启动子和PTEN基因的腺病毒载体reADGL3BSurvPTEN,Western blot结果显示感染ADGL3BSurvPTEN后在高表达survivin的前列腺癌细胞中PTEN表达明显增高,而在不表达survivin的正常前列腺细胞中,仅检测到内源性PTEN的表达。CCK-8法及流式细胞术结果表明reADGL3BSurvPTEN病毒对前列腺癌细胞的杀伤作用较不含PTEN基因的腺病毒re-ADGL3Bsurvivin更加明显,对正常前列腺上皮细胞没有显著的杀伤作用。结论成功构建了含有survivin启动子和PTEN基因的条件复制型腺病毒,该病毒对前列腺癌细胞有显著的杀伤作用,实验结果为前列腺癌细胞靶向治疗提供了更为良好的条件复制型病毒载体及新的治疗策略。     

Modulation of Isoflavones on Bone—nodule Formation in Rat Calvaria Osteoblasts in vitro

Objective:to observe the effects of two main isoflavones,daidzein and genistein on the bone-nodule formation in rat calvaria osteoblasts in vitro.Methods:Osteoblasts obtained from newborn Sprague-dawley rat calvarias were cultured for several generations.The second generation cells were cultured in Minimum Essential Medium supplemenmted with ascorbic acid and Na-beta-glycerophosphate for several days,in the presence of daidzein and genistein,with or without the estrogen receptor antagonist ICI 182780.Number of nodules was counted at the end of the incubation period(day 20) by staining with Alizarin Red S calcium stain.The release of osteocalcin,as a marker of osteoblast activity,was also determined on day 7 and 12 during the incubation period.Results:compared with the control,the numbers of nodules were both increased by incubation with daidzin and genistein,17β-estradiol was used as a positive control and proved to be a more effective inducer of the increase in bone-nodules formation than daidzein and genisterin.The release of osteocalcin into culture media was also increased in the presence of daidzein and genistein,as well as 17β-estradiol on day 7 and day 12(day 12 were higher).The estrogen receptor antagonist ICI 182780 completely blocked the genistein-and 17β0estradiol-induced increase of nodule numbers and osteocalcin release in osteoblasts.Howerver,the effects induced by daidzein could not be inhibited by ICI 182780.Conclusion:These findings suggest that geinistein can stimulate bone-nodule formation and increase the release of osteocalcin in rat osteoblasts.The effects,like those induced by 17β-estradiol,are mediated by the estrogen receptor dependent pathway,Daidzin also can stimulate bone-nodule formation and increase the release of osteocalcin in rat osteoblasts,but it is not,at least not merely,mediated by the estrogen receptor dependent pathway.     

Influence of Isoflavones on Cadmium-induced Adverse Effects in Vascular Endothelial Cells （ECV 304）

To study the possible intervention of isoflavones in cytotoxicity induced by cadmium in vascular endothelial cells. Methods An ECV 304 cell line derived from human umbilical vein endothelial cells was adopted. Genistein / daidzein was added prior to or simultaneously with CdCl2, cell viability was determined by MTT assay, and metallothionein mRNA expression was monitored by RT-PCR method. Results Cell viability was higher in isoflavone and CdCl2. co-treated groups than that in CdCl2 treated group, with CdCl2 concentration at 10, 20, 40, and 80 μmol/L, respectively. However this increase was not observed in the group treated with CdCl2 at a concentration of 60 μmol/L, lsoflavones (10^-1mol/L to 10^-5 mol/L) were added 24 h before cells were challenged with 80 μmol/L CdCl2 for 24 h or simultaneously with 80 ^-10mol/L CdCl2. Genisteinincreased cell viability only at 10^-5 mol/L, while daidzein caused a dose-dependent increase from 10^-10 mol/L to 10^-5 mol/L in co-treatment with CdCl2. In pre-treatment, genistein (10^-7 to 10^-5 mol/L) increased cell viability whereas only 10^-5 mol/L of daidzein exerted protection. Apparent protection could be found when the cells were pre-treated with 10^-5 mol/L isoflavones for over 12 h, whereas 24 h incubation was required in such a co-treatment, with the exception of daidzein that had a significant protection in only 3 h. Isoflavones (10^-6 mol/L) incubated for 3 h to 24 h, increased MT ⅡA and MT IF mRNA expression, but the induction could not last for more than 24 h. Co-treatment with isoflavones could induce an additional induction of MT ⅡA mRNA expression in cells exposed to cadmium. However, the additional induction of MT ⅡA and MT IF mRNA was not seenwhen pre-treatment was carried out with isoflavones, with the exception of an increase in MT ⅡA mRNA expression in the daidzein pre-treated group. Conclusion Genistein/daidzein could reverse the cytotoxicity of cadmium either in pre-treatment or in co-treatment. The protection is the strongest in 10^-5 mol/L of isoflavones with a dose-dependent pattern. There are differences between genistein and daidzein in their protective effects. Whether the protection of isoflavones is related to their capacity of inducing MT mRNA expression remains to be elucidated.     

Effects of blocking androgen receptor expression with specific hammerhead ribozyme on in vitro growth of prostate cancer cell line

Aseriesofstudieshaveindicatedthatandrogenreceptor(AR) playsakeyroleinthedevelopmentofprostatecancerbymediatingandrogenactivityontargetcells 1Ithasbeen proposedthatdecreasingandrogenandARlevelscouldbeaneffectivetherapeuticstrategyforprostatecancer 2 　InthisstudyaribozymeapproachtoselectivedegradationofARmRNAwasusedtoexploretheeffectsofblockingARexpressiononinvitrogrowthofhumanprostatecancercells METHODSRibozymedesignandsynthesisUsingtheMFOLDcomputerprogramanARspecificribozyme(RZ)was…     

The inhibitory effects of siRNA expression vector on CXCR4 expression in prostate carcinoma cell lines

INTRODUCTION Ithasbeendemonstratedthatchemokinesandtheirreceptorsarecloselyrelatedtomalignantbehavior oftumorcells.Especially,thechemotaxiscausedby CXCR4anditsligandstromalcellderivedfactor1(SDF1)inthetumorcells,suchasleukemiacells,lungcarcinomacellsandovarycarcinomacells,isthe mostinteresting[13].Ithasalsobeenindicatedthat CXCR4isexpressedinmanykindsofnasopharyngeal carcinomacellsandprostatecarcinomacells[46].CXCR4andSDF1canalsobeexpressedsimultaneouslyinsome kindsoftumorcells.The…     

大豆苷原对成骨细胞MC3T3-E1甾体激素受体辅激活因子1表达的调节作用及其机制

目的：研究大豆苷原对成骨细胞MC3T3－E1甾体激素受体辅激活因子1（steroid receptor coactivator-1,SRC-1）和核受体辅抑制因子（nuclear receptor corepressor,NcoR）表达的调节作用及其机制。方法：体外培养MC3T3-E1细胞于含29／6胎牛血清（fetal bovine serum,FBS）的α最低必须培养基（α—minimal essential medium,α—MEM）中,给予不同浓度大豆苷原或10^-6 mol／L的雌二醇作用3d后收获细胞,采用蛋白质印迹法观察SRC-1和NcoR蛋白的表达水平。分别应用雌激素受体（estrogen receptor,ER）拮抗剂ICI182780（Faslodex,ICI,10^-7 mol／L）和雌激素受体α（estrogen receptor α,ERα）特异性拮抗剂（methyl—piperidino—pyrazole,MPP,10^-6 mol／L）干预,观察大豆苷原对细胞SRC-1和NcoR蛋白表达水平的影响。结果：大豆苷原可上调MC3T3-E1细胞SRC-1的表达,10^-7mol／L和10smol／L大豆苷原组SRC-1的蛋白水平分别增加至对照组的2．5倍（P〈0．05）和2倍（P〈0．05）。各剂量组NcoR表达水平与对照组比较差异无统计学意义。雌二醇组SRC-1水平与对照组比较未见明显变化,而其NcoR表达水平较对照组下调35％（P〈0．05）。ICI182780可拮抗大豆苷原对SRC-1的上调作用。在ICI182780作用下,各剂量组SRC-1蛋白水平与对照组比较差异无统计学意义;MPP干预下,10^-7mol／L和10^-5 mol／L大豆苷原组SRC-1的蛋白水平分别为对照组的1．8倍（P〈0．05）和2．4倍（P〈0．05）。结论：大豆苷原可增加成骨细胞SRC-1的蛋白表达水平,提高细胞SRC-1／NcoR比值。ER8参与了大豆苷原对SRC-1的调节过程。成骨细胞内SRC-1蛋白的增加和SRC-1／NcoR比值的提高是大豆苷原促进成骨细胞分化的机制之一。     

姜黄素对前列腺癌LNCaP细胞PSA生成及AR表达的影响

【目的】研究姜黄素对前列腺癌细胞株LNCaP细胞增殖的影响。【方法】化学发光法检测不同浓度的姜黄素处理前列腺癌细胞株LNCaP后前列腺特异抗原(PSA)含量,利用荧光素酶报告基因pGL-3构建含PSA基因5’侧启动子区640 bp DNA的荧光素酶表达载体pGL3-PSA,并将其转染LNCaP细胞,不同浓度姜黄素作用24 h后应用荧光素酶测定系统检测荧光素酶表达活性。用免疫印迹Western-blotting技术检测雄激素受体(AR)的表达。【结果】姜黄素抑制LNCaP细胞培基中PSA蛋白及含PSA启动子的荧光素酶活性的表达;形态学结果显示姜黄素可抑制前列腺癌细胞LNCaP的增殖;Western-blotting技术检测结果显示姜黄素抑制AR的表达,并且对AR表达的抑制程度依赖于姜黄素的浓度。【结论】姜黄素对PSA启动子的影响及PSA蛋白表达的抑制作用是通过抑制雄激素受体(AR)的表达实现的,姜黄素能够抑制前列腺癌细胞LNCaP的增殖。     

β-羟基异戊酰紫草素对前列腺癌细胞株的生长抑制作用及机制研究

目的 研究β-羟基异戊酰紫草素(β-HIVS)对激素非依赖性前列腺癌细胞株PC-3的体外生长抑制作用及其可能机制.方法 采用MTT法检测β-HIVS对PC-3和人皮肤成纤维细胞株HSF的细胞生长抑制率;荧光素酶报告基因法检测给药后细胞中低氧诱导因子-1(HIF-1)和核因子κB(NF-κB)的转录活性;RT-PCR检测HIF-1下游靶基因血管内皮生长因子(VEGF)的表达;Western blotting检测β-HIVS作用后HIF-1α蛋白的表达水平.结果 β-HIVS对PC-3的细胞生长具有显著抑制作用(P<0.05),而对HSF的细胞生长无明显影响(P>0.05).给药后PC-3细胞中NF-κB转录活性无明显变化(P>0.05);而HIF-1转录活性受抑(P<0.05),其下游靶基因VEGF表达下调,且细胞中HIF-1α蛋白累积减少.结论 β-HIVS对PC-3的细胞生长具有抑制作用,其机制可能与β-HIVS减少低氧条件下PC-3中HIF-1α蛋白水平,抑制其转录活性,使下游促细胞生长靶基因VEGF表达下调有关.