染料木黄酮对MDA-MB-453乳腺癌细胞uPA表达及PTK活性的影响研究

目的: 观察染料木黄酮(亦称三羟异黄酮,genistein,Gen)对MDA-MB-453乳腺癌细胞尿激酶型纤维蛋白溶酶原激活剂(urokinase-type plasminogen activator,uPA)表达及蛋白酪氨酸激酶(protein tyrosine kinase,PTK)活性的影响,探讨Gen抗HER-2/neu高表达乳腺癌血管生成的分子机制。方法: 5×10-5mol/L Gen处理MDA-MB-453细胞24、48、72 h后,应用Western blot、免疫沉淀、RT-PCR及激酶活性分析法检测Gen对MDA-MB-453乳腺癌细胞uPA表达、HER-2/neu受体蛋白磷酸化水平及PTK活性变化。结果: Gen处理MDA-MB-453细胞后,uPA的mRNA和蛋白表达量下调,HER-2/neu受体蛋白磷酸化水平降低,PTK活性下降,且这种作用具有时效性。结论: Gen能有效抑制乳腺癌细胞HER-2/neu受体的PTK活性和蛋白磷酸化水平,在转录和翻译水平下调uPA的表达,从而抑制HER-2/neu高表达乳腺癌血管生成。     

染料木黄酮对MDA-MB-453乳腺癌细胞VEGF表达的影响

目的:观察染料木黄酮(genistein,Gen)对MDA-MB-453乳腺癌细胞血管内皮生长因子(vascularendothelialgrowthfactor,VEGF)表达的影响,探讨Gen抗HER-2/neu高表达乳腺癌血管生成的分子机制。方法:5×10-5mol/LGen处理MDA-MB-453细胞24、48、72h后,应用免疫组织化学、Westernblot及RT-PCR法检测MDA-MB-453乳腺癌细胞VEGF的表达变化。结果:Gen处理MDA-MB-453细胞24、48、72h后,VEGF的mRNA和蛋白表达量随着处理时间的延长逐渐下降。结论:Gen能在转录和翻译水平下调HER-2/neu高表达乳腺癌细胞VEGF的表达,这可能是Gen抑制HER-2/neu高表达乳腺癌血管生成的机制之一。     

木黄酮对MCF-7/HER-2细胞uPA表达影响

目的探讨植物化学物质染料木黄酮(genistein)抗HER-2/neu高表达乳腺癌血管生成的分子机制。方法采用基因转染技术建立HER-2/neu高表达MCF-7乳腺癌细胞(命名为MCF-7/HER-2),5×10-5mol/L染料木黄酮处理MCF-7/HER-2细胞24,48,72 h后,应用western bolt、免疫沉淀、RT-PCR及激酶活性分析法检测genistein对MCF-7/HER-2乳腺癌细胞尿激酶型纤维蛋白溶酶原激活剂(urokinase-type plasminogen activator,uPA)表达、HER-2/neu受体蛋白磷酸化水平及蛋白酪氨酸激酶(PTK)活性变化。结果MCF-7/HER-2细胞uPA的mRNA和蛋白表达量比MCF-7细胞uPA的mRNA和蛋白表达量高,HER-2/neu受体蛋白磷酸化水平和PTK活性增加,染料木黄酮处理MCF-7/HER-2细胞后,uPA的mRNA和蛋白表达量下调,HER-2/neu受体蛋白磷酸化水平降低,PTK活性下降,且这种作用具有时效性。结论染料木黄酮能下调MCF-7/HER-2细胞HER-2/neu受体的PTK活性和蛋白磷酸化水平,抑制uPA表达,这可能是染料木黄酮抗乳腺癌血管生成的分子机制之一。     

花色苷对ApoE基因缺陷小鼠炎症信号转导的影响

目的:探讨黑米皮(BRF)花色苷(ANTH)对ApoE基因(ApoE-/-)缺陷小鼠动脉粥样硬化(AS)斑块形成及炎症信号转导的影响。方法:将45只雄性ApoE-/-小鼠随机分为三组:阳性对照组(A组)、花色苷提取后黑米皮组(B组)和黑米皮花色苷组(C组);15只正常小鼠为阴性对照组(D组)。B组和C组分别加入黑米皮花色苷提取物及5%花色苷提取后的黑米皮,饲养20w,取血后处死动物,测定主动脉脂质斑块大小和血液各型NOS水平及NO水平,Western-blot法检测血管壁内ICAM-1及NF-κB表达。结果:C组的主动脉脂质斑块面积大小明显低于A组和B组;C组总一氧化氮合酶(tNOS)水平明显高于A组和B组;C组血清中iNOS水平略有降低,但差异不显著;C组血清cNOS和NO水平显著升高;C组COX-2mRNA、ICAM-1及NF-κB蛋白质表达下降。结论:黑米皮花色苷是黑米皮抗AS的活性成分,其作用机制与抑制NF-κB介导的炎性因子iNOS、COX-2表达及促进血管舒张因子NO生成有关。     

蛇床子对HER-2阳性乳腺癌的作用及K-ras的影响

目的 拟探讨K-ras基因和不同分期HER-2阳性乳腺癌的相关性及蛇床子对其调控作用。方法 应用TCGA数据库乳腺浸润癌（breast invasive cancer,BRCA）项目的 RNAseq数据分析K-ras基因和不同分期HER-2阳性乳腺癌的相关性。体外培养乳腺癌4T1细胞系,分析蛇床子对HER-2/neu高表达4T-1细胞增殖、凋亡活性EMT的影响,以及K-ras基因和Ras/MAPK通路的影响。结果 K-ras基因表达增高和不同TNM分期显著相关。蛇床子可抑制HER-2/neu高表达乳腺癌4T-1细胞增殖,促进凋亡,抑制EMT发生,抑制K-ras基因（P <0.05）,蛇床子可下调Ras/MAPK信号通路。结论 K-ras基因表达增高和HER-2阳性乳腺癌不同TNM分期显著相关,蛇床子可调控K-ras基因,进而下调Ras/MAPK信号通路,抑制乳腺癌进展。     

染料木黄酮影响MDA-MB-453细胞对紫杉醇化疗敏感性的机制

目的:探讨染料木黄酮(genistein,GEN)影响紫杉醇(paclitaxel,PTX)体外化疗HER2/neu高表达人乳腺癌细胞株MDA-MB-453敏感性的作用机制。方法:GEN和PTX单独或联合处理MDA-MB–453细胞,流式细胞仪检测细胞周期分布,免疫细胞化学法检测HER2/neu蛋白、Westernblot检测Akt、p-Akt、CyclinB1、CDK1蛋白表达的变化。结果:GEN和PTX单独作用时MDA-MB-453细胞分别阻滞于G1/S期和G2/M期,HER2/neu、总Akt和CDK1蛋白水平均没有明显变化,但GEN可显著降低p-Akt和CyclinB1蛋白水平,而PTX则明显增加CyclinB1蛋白水平,二者联合处理时GEN拮抗PTX增加CyclinB1蛋白水平和诱导G2/M期阻滞的作用。结论:GEN拮抗PTX增加cyclin B1蛋白水平和G2/M期阻滞的作用,可能是其降低PTX体外化疗MDA-MB-453细胞敏感性的机制之一。     

p38信号通路对白蛋白诱导肾小管上皮细胞骨调素mRNA的表达

目的探讨p38信号通路(p38MAPK)在白蛋白介导的大鼠肾小管上皮细胞表达骨调素(OPN)中的作用。方法应用W estern印迹法检测p38MAPK在白蛋白诱导的肾小管上皮细胞中的活化程度,应用逆转录-聚合酶链式反应(RT-PCR)法观察白蛋白及p38MAPK特异性阻断剂SB203580对肾小管上皮细胞促炎症介质骨调素OPN mRNA的影响。结果白蛋白以时间依赖性刺激NRK-52E引起的p38MAPK活化,并明显上调肾小管上皮细胞OPN mRNA的表达。SB203580能显著抑制OPN mRNA的表达。结论p38MAPK在白蛋白介导的肾小管上皮细胞上调表达黏附因子OPN中起重要作用。     

TGF-β1通过p38MAPK信号通路调节大鼠睾丸支持细胞闭锁蛋白表达的研究

目的探讨TGF-β1介导的p38MAPK信号通路对大鼠睾丸支持细胞闭锁蛋白表达的作用及意义。方法体外分离培养大鼠睾丸支持细胞,随机分为空白对照组、刺激组、受体阻滞剂组、受体阻滞剂+刺激组、抑制因子组和抑制因子+刺激组6组;测定各组细胞增殖情况、p38MAPK mRNA和闭锁mRNA的表达水平以及各组细胞闭锁蛋白和P-p38MAPK蛋白表达水平。结果组间比较差异有统计学意义(F=4.86,P0.05)。刺激组细胞增殖活性升高,差异有统计学意义(P0.05);刺激组闭锁蛋白mRNA表达比空白对照组降低,p38MAPK mRNA表达升高;抑制因子组p38MAPK mRNA表达降低,差异均有统计学意义(P0.05)。受体阻滞剂+刺激组闭锁蛋白mRNA表达比刺激组升高,p38MAPK mRNA表达降低;抑制因子+刺激组闭锁蛋白mRNA表达升高,p38MAPK mRNA表达降低,差异均有统计学意义(P0.05)。刺激组闭锁蛋白表达比对照组降低,P-p38MAPK蛋白表达升高;抑制因子组P-p38MAPK蛋白表达降低,差异有统计学意义(P0.05)。受体阻滞剂+刺激组闭锁蛋白表达比刺激组升高,P-p38MAPK蛋白表达降低;抑制因子+刺激组闭锁蛋白表达升高,P-p38MAPK蛋白表达降低差异均有统计学意义(P0.05)。结论 TGF-β1可能通过p38MAPK信号通路调控大鼠睾丸支持细胞闭锁蛋白的表达。     

PDCD4对SKO-V3细胞生长凋亡及p-p38MAPK、p-STAT3水平的影响

目的探讨程序性细胞死亡4 (PDCD4)对SKO-V3细胞生长、凋亡及p-STAT3、p-p38MAPK表达的影响。方法卵巢癌细胞SKO-V3转染PDCD4过表达载体(p DsRes2-N1-PDCD4)和对照载体(p DsRes2-N1),记为过表达组和阴性组,同时以不转染的细胞为对照组,Realtime PCR和Western blot检测PDCD4水平,噻唑蓝(MTT)和细胞克隆实验检测细胞增殖能力,流式细胞术检测细胞凋亡,Western blot检测磷酸化的p38MAPK (p-p38MAPK)、磷酸化的STAT3 (p-STAT3)水平。结果阴性组细胞中PDCD4 mRNA和蛋白水平、光密度值(OD值)、细胞克隆形成数目、凋亡率和p-p38MAPK、p-STAT3水平与对照组相比差异无统计学意义(P0. 05)。过表达组细胞中PDCD4 mRNA和蛋白水平明显高于对照组,并且细胞OD值和克隆形成数目明显低于对照组,而细胞凋亡率明显高于对照组(P0. 01)。过表达组p-STAT3/STAT3水平与对照组相比明显降低,p-p38MAPK/p38MAPK水平与对照组相比明显升高(P0. 01)。结论 PDCD4抑制卵巢癌细胞生长,促进卵巢癌细胞凋亡,这可能与抑制STAT3信号通路激活和促进p38MAPK信号通路激活有关。     

贝伐珠单抗对高表达HER-2/neu卵巢癌小鼠的治疗作用

目的探讨贝伐珠单抗对高表达HER-2/neu卵巢癌小鼠的治疗作用。方法选择雌性健康小鼠76只,将人卵巢癌SKOV3细胞接种于小鼠建立模型,然后随机分成两组各38只。对照组尾静脉注射顺铂,观察组尾静脉注射顺铂同时腹腔注射贝伐珠单抗,比较两组SKOV3细胞生长抑制率,观察两组小鼠瘤体的生长抑制情况,对比两组小鼠的HER-2/neu标记指数、p53标记指数。结果观察组细胞生长抑制率高于对照组,差异有统计学意义(P0.01)。观察组的肿瘤抑制率(95.54±6.57)%高于对照组肿瘤抑制率(70.62±5.11)%,差异有统计学意义(P0.01)。观察组小鼠的HER-2标记指数、p53标记指数都低于对照组,差异均有统计学意义(P0.01)。结论贝伐珠单抗能抑制高表达HER-2/neu卵巢癌肿瘤细胞的生长,作用机制可能与贝伐珠单抗能够调控p53基因及HER-2/neu基因表达有关。     

Wasabi-Derived 6-(Methylsulfinyl)Hexyl Isothiocyanate Induces Apoptosis in Human Breast Cancer by Possible Involvement of the NF-κB Pathways

6-(methylsulfinyl)hexyl isothiocyanate (6-MSITC) is a bioactive ingredient of wasabi (Wasabia japonica), which is a popular spice in Japan. 6-MSITC has been reported to inhibit the proliferation of breast cancer and melanoma cell lines. We inoculated 30 female Balb-nu/nu mice with MDA-MB-231 or -453 cells, and orally administered varying concentrations of 6-MSITC for 12 days following tumor growth. The tumor volumes and tumor weights from mice inoculated with MDA-MB-231 cells, and the tumor volumes of MDA-MB-453 cells were significantly inhibited by 6-MSITC on Days 9 and 11 after drug administration. DNA fragmentation, DNA ladder, and caspase 3/7 activity performed in vitro revealed that 6-MSITC induced apoptosis of MDA-MB-231, MDA-MB-453, and MCF-7 cells. Furthermore, nuclear factor-κB (NF-κB) expression in the nuclei and phosphorylation of inhibitor κBα (IκBα) was downregulated by 6-MSITC in a concentration-dependent manner; however, this activity was not observed in MCF-7 cells. Moreover, this downregulation of phosphorylated IκBα by 6-MSITC in MDA-MB-231 and -453 cells supports its inhibitory effects on NF-κB activity. The expression of phosphorylated AKT (pAKT) reduced by 6-MSITC was confirmed in MDA-MB-231 cells. Thus, we conclude that 6-MITC promotes apoptosis of breast cancer cells by inhibiting NF-kB and therefore releasing its control of the PI3K/AKT pathway.     

Anthocyanins from Black Rice (Oryza sativa L.) Demonstrate Antimetastatic Properties by Reducing MMPs and NF-κB Expressions in Human Oral Cancer CAL 27 Cells

Aside from the commonly known white rice lines, colored varieties also exist. These varieties have historically been used in Chinese medicine. Anthocyanins, a large group of natural polyphenols existing in a variety of daily fruits and vegetables, have been widely recognized as cancer chemopreventive agents. The primary objective of cancer treatment strategies has traditionally focused on preventing the occurrence of metastasis. In this research the antimetastatic mechanism of anthocyanins on the invasion/migration of human oral CAL 27 cells was performed using a transwell to quantify the migratory potential of CAL 27 cells and the results show that anthocyanins can inhibit the in vitro migration and invasion of CAL 27 cancer cells. In addition, the gelatin zymography assay indicated that anthocyanins inhibited the activity of matrix metalloproteinases-2 (MMP-2). Western blotting assay also demonstrated that anthocyanins inhibited the associated protein expression of migration/invasion of CAL 27 cell. Immunofluorescence staining proved that anthocyanins inhibited nuclear factor kappa B p65 (NF-κB p65) expressions. These results demonstrated that anthocyanins from a species of black rice (selected purple glutinous indica rice cultivated at Asia University) could suppress CAL 27 cell metastasis by reduction of MMP-2, MMP-9, and NF-κB p65 expression through the suppression of PI3K/Akt pathway and inhibition of NF-κB levels.     

Anticancer activities of an anthocyanin-rich extract from black rice against breast cancer cells in vitro and in vivo

Anthocyanins widely present in human diet and have a variety of health effects. This study investigates the anticancer effects of an anthocyanin-rich extract from black rice (AEBR) on breast cancer cells in vitro and in vivo. AEBR reduced the viability of breast cancer cell lines MCF-7 (ER(+), HER2/neu(-)), MDA-MB-231 (ER(-), HER2/neu(-)), and MDA-MB-453 (ER(-), HER2/neu(+)) and induced apoptosis in MDA-MB-453 cells via the intrinsic pathway in vitro by activating caspase cascade, cleaving poly (ADP-ribose) polymerase (PARP), depolarizing mitochondrial membrane potential, and releasing cytochrome C. Oral administration of AEBR (100 mg/kg/day) to BALB/c nude mice bearing MDA-MB-453 cell xenografts significantly suppressed tumor growth and angiogenesis by suppressing the expression of angiogenesis factors MMP-9, MMP-2, and uPA in tumor tissue. Altogether, this study suggests the anticancer effects of AEBR against human breast cancer cells in vitro and in vivo by inducing apoptosis and suppressing angiogenesis.     

Anticancer Activities of an Anthocyanin-Rich Extract From Black Rice Against Breast Cancer Cells In Vitro and In Vivo

Anthocyanins widely present in human diet and have a variety of health effects. This study investigates the anticancer effects of an anthocyanin-rich extract from black rice (AEBR) on breast cancer cells in vitro and in vivo. AEBR reduced the viability of breast cancer cell lines MCF-7 (ER⁺, HER2/neu^?), MDA-MB-231 (ER^?, HER2/neu^?), and MDA-MB-453 (ER^?, HER2/neu⁺) and induced apoptosis in MDA-MB-453 cells via the intrinsic pathway in vitro by activating caspase cascade, cleaving poly (ADP-ribose) polymerase (PARP), depolarizing mitochondrial membrane potential, and releasing cytochrome C. Oral administration of AEBR (100 mg/kg/day) to BALB/c nude mice bearing MDA-MB-453 cell xenografts significantly suppressed tumor growth and angiogenesis by suppressing the expression of angiogenesis factors MMP-9, MMP-2, and uPA in tumor tissue. Altogether, this study suggests the anticancer effects of AEBR against human breast cancer cells in vitro and in vivo by inducing apoptosis and suppressing angiogenesis.     

雌马酚通过抑制核转录因子-κB表达水平诱导人乳腺癌MDA-MB-231细胞凋亡

目的研究雌马酚对雌激素受体表达阴性的人乳腺癌细胞株MDA-MB-231的作用。方法用MTT法测定雌马酚干预对MDA-MB-231细胞活力的影响;光学显微镜观察雌马酚对细胞形态的影响;流式细胞术及免疫细胞化学法检测雌马酚对细胞凋亡的作用。结果雌马酚可以抑制MDA-MB-231细胞的活力(P<0.05)。雌马酚可抑制NF-κB的表达而诱导细胞凋亡。结论雌马酚可通过降低NF-κB的表达诱导MDA-MB-231凋亡。     

维生素E琥珀酸酯对人胃癌细胞中核因子及抗凋亡基因的影响

目的本研究以人胃癌SGC-7901细胞为肿瘤模型,在体外探讨维生素E琥珀酸酯(VES)在抑制肿瘤细胞生长、诱导细胞凋亡过程中对NF-κB组成性激活及抗凋亡基因在转录水平上的调控作用。方法采用MTT法和AnnexinV法分别检测不同浓度水平VES处理人胃癌SGC-7901细胞后细胞的生长和凋亡情况。采用细胞成分分离法获得细胞核总蛋白,然后以Westernblot法测定VES处理后核因子蛋白p65在细胞核总蛋白中的含量。用RT-PCR方法检测VES对SGC-7901细胞中抗凋亡基因c-IAP1、c-IAP-2、NAPI、survivin、XIAP的转录调节作用。结果12.5～50.0μmolVES作用24h后,SGC-7901细胞的生长被明显抑制。50μmolVES作用于细胞12h后可诱导细胞发生凋亡,且作用48h后其凋亡诱导作用更明显。Westernblot结果发现,VES处理SGC-7901细胞后使细胞核内NF-κBp65蛋白的含量下降,即抑制了NF-κBp65向细胞核内的迁移。RT-PCR结果提示,VES处理胃癌细胞后可以在基因水平上抑制抗凋亡基因NAIP和survivin转录,对其他IAPs家族成员-c-IAP1、c-IAP-2、XIAP的转录无下调作用。结论VES对SGC-7901细胞内NF-κB组成性激活的调控作用及对抗凋亡基因在转录水平上的抑制作用可能是其抑制SGC-7901细胞生长、诱导细胞发生凋亡的机制之一。     

曲古抑菌素A与5-氟尿嘧啶协同对肝癌细胞HepG2的抑制作用

[目的]研究5-氟尿嘧啶(5-FU)与曲古抑菌素A(TSA)单独及联合应用对人肝癌细胞HepG2生长的抑制作用,并初步探讨其与NF-κBp65和AKT表达的关系。[方法]以MTT法观察5-FU或(和)TSA对HepG2细胞生长的影响,Hoechst染色法分析细胞凋亡情况,Westernblot检测NF-κBp65和AKT蛋白表达水平的变化。[结果]与对照组相比,5-FU与TSA均可导致处理的细胞增殖速度减慢,且抑制效应随药物剂量的增加而增强,两药联合应用可明显增强其抑制作用,促进HepG2细胞凋亡,并降低NF-κBp65和AKT蛋白的表达(P﹤0.01)。[结论]TSA和5-FU联合应用可能通过协同调控下调NF-κBp65与AKT蛋白表达而抑制HepG2细胞的增殖。