MR1 siRNA抑制人肝癌细胞BEL-7402的增殖

目的 研究MR1基因对肝癌细胞增殖的影响及机制。 方法 化学合成MR1 siRNA,用脂质体lipofectamine 2000转染肝癌细胞系BEL-7402细胞,RT-PCR检测MR1 siRNA基因沉默效果。用SRB法、集落形成法和生长曲线法检测MR1 siRNA对BEL-7402细胞增殖的影响。流式细胞术检测BEL-7402细胞周期,用细胞同步化的方法,即与G2期阻滞药物噻氨酯哒唑（nocodazole）联合应用,以间接反映MR1 siRNA对肿瘤细胞周期的影响。Western blot法检测Cyclin D1蛋白。结果（1）300nmol/L MR1 siRNA处理BEL-7402细胞24h后,MR1基因的mRNA水平明显降低。（2）经siRNA处理后,BEL-7402细胞存活细胞数明显下降,细胞生长速度明显减慢,集落形成率显著下降,Cyclin D1表达水平明显降低。（3）MR1 siRNA与nocodazole联合处理BEL-7402细胞后,G2期细胞比例显著减少,而G1期细胞明显增多。结论 MR1基因与人肝癌BEL-7402细胞增殖相关,抑制MR1表达,能够引起细胞的增殖抑制,其作用机制与诱导细胞的G1期阻滞有关。     

人羊膜上皮细胞上清液对人肝癌BEL-7402细胞的体外抗肿瘤作用

目的探讨人羊膜上皮细胞(h AECs)上清液对体外培养的肝癌细胞系BEL-7402细胞迁移、增殖与凋亡的影响。方法 BEL-7402细胞随机分为5组,其中对照组不加h AECs上清液,其余4组加入体积分数分别为6.25%、12.5%、25%和50%的h AECs上清液作用24 h后,通过划痕实验、MTT试验和流式细胞术检测BEL-7402细胞迁移、增殖和凋亡;Western blot法检测凋亡相关蛋白的表达量。结果 h AECs上清液能剂量依赖性地抑制BEL-7402细胞迁移、增殖并诱导凋亡(P0.05);25%和50%h AECs上清液组BEL-7402细胞caspase-3和caspase-8蛋白的切割片断蛋白定量明显高于对照组(P0.05)。结论 h AECs上清液对体外培养的BEL-7402细胞具有一定的抗肿瘤作用。     

103Pd粒子对人肝癌细胞-7402细胞毒作用的实验研究

目的探讨103Pd粒子对人肝癌细胞-7402的细胞毒作用. 方法以体外培养的人肝癌细胞-7402为研究对象,采用对照分组、体外细胞毒试验(MTT)、方差分析,观察103Pd粒子放疗对肝癌细胞-7402的生长抑制作用.结果 103Pd粒子对肝癌细胞-7402的细胞毒作用与照射时间、照射剂量有关,照射时间越长、照射剂量越大,细胞毒作用越强. 结论人肝癌细胞-7402对103Pd粒子放疗敏感.     

三氧化二砷对肝癌细胞生长抑制作用差异性探讨

目的:观察三氧化二砷对肝癌SMMC-7721和BEL-7402细胞生长抑制作用差异性并且探讨其可能的作用机理。方法: 应用细胞培养和台盼蓝拒染法观察不同时间和不同浓度的三氧化二砷对肝癌细胞SMMC-7721和BEL-7402细胞生长的抑制作用,比较生长抑制率的差异并用谷胱甘肽检测试剂盒测定两种肝癌细胞内谷胱甘肽(GSH)的含量。结果: 三氧化二砷浓度为0.50 μmol/L、作用时间为24 h可显著抑制肝癌细胞系BEL-7402的生长,抑制作用呈时间、剂量依赖性;对SMMC-7721细胞,三氧化二砷浓度为2.00 μmol/L、作用时间为24 h才出现抑制细胞生长作用,二者的生长抑制率存在显著差异,0.25-2.00 μmol/L As₂O₃作用72 h后,BEL-7402细胞的生长抑制率均高于SMMC-7721细胞(P＜0.05)。检测SMMC-7721和BEL-7402细胞内GSH含量分别为(50.8±5.2)μmol/g protein和(18.7±1.4)μmol/g protein,存在明显差异。 结论:三氧化二砷抑制肝癌细胞SMMC-7721和BEL-7402的生长存在显著的差异;BEL-7402细胞对三氧化二砷非常敏感性,可能与其细胞内谷胱甘肽含量较低,细胞的氧化还原解毒系统不足有关。     

含蟾酥胶囊血清诱导人肝癌BEL-7402细胞凋亡并下调Bcl-2的表达

目的 探讨含蟾酥胶囊血清诱导人肝癌BEL-7402细胞凋亡的作用机制.方法 用中药血清药理学方法,不同浓度含药血清加入体外培养的人肝癌BEL-7402细胞,分别孵育24h、48h,显微镜下观察细胞形态学变化,MTT比色法检测细胞存活率,流式细胞仪检测细胞凋亡率,琼脂糖凝胶电泳测定DNA梯状条带,免疫细胞化学染色检测Bc...     

白杨素对人肝癌BEL-7402细胞表面超微结构和蛋白质磷酸化及相关通路的影响

背景：白杨素是保健食品和中草药中常见的具有防癌抗癌活性的食源黄酮类天然产物。白杨素是否有助于防治肝癌？其作用机制为何？是否促进肝癌干细胞的分化？对此尚缺乏系统研究。 目的：以人肝癌细胞为对象,揭示白杨素的亚细胞和分子作用机制。 方法：应用酸性磷酸酶实验、扫描电镜、免疫印迹技术探讨白杨素对BEL-7402细胞的作用及其机制。 结果与结论：白杨素显著抑制BEL-7402细胞的体外增殖,半数抑制浓度IC50为24.9 mol/L或6.3 mg/L。白杨素与PI3K-AKT途径特异性抑制剂LY294002联用具有显著的协同抗癌效应。但白杨素本身并不改变AKT、磷酸化pAKT、AKT下游分子GSK-3和磷酸化pGSK-3的表达水平,虽然高剂量下β-catenin略有下调。白杨素导致细胞表面微绒毛样突起密度明显增加并形成纳米膜粒;细胞回缩,间隙加宽;出现形态上不同于凋亡的死亡细胞。白杨素显著改变多种蛋白质的丝/苏氨酸磷酸化水平;对酪氨酸磷酸化亦有广谱下调作用,接近于表柔比星对照。白杨素对CDK1、磷酸化pCDK1和pCDK2、CDC25A、CDC25B和CD133均无明显影响,但可剂量依赖性诱导PARP-1降解。总之,白杨素对BEL-7402细胞的抑制作用并非起因于PI3K-AKT和Wnt/β-catenin通路阻断或细胞周期核心调控因子阻断,而更可能起因于生物膜功能障碍所致细胞表面超微结构和蛋白质磷酸化的大范围改变,并以非经典方式诱导肝癌细胞死亡。     

胡椒醛缩氨基均三唑席夫碱对人肝癌细胞分化和凋亡的影响

目的 观察胡椒醛缩氨基均三唑席夫碱对人肝癌细胞BEL-7402的诱导分化和凋亡作用.方法 用不同浓度的1-(3,4-二氧亚甲基)苯甲亚氨基-2-吡啶-3-基-5-甲硫基-[1,2,4]三唑(LH-36)与BEL-7402细胞体外培养.MTT法检测细胞增殖和LH-36对细胞增殖的抑制作用.用Hoechst 33258荧光染色观察细胞凋亡变化.免疫细胞化学检测细胞内激活型Caspase-3表达.反转录聚合酶链反应(RT-PCR)方法检测细胞甲胎蛋白(α-FP)和白蛋白(Alb)mRNA表达,以了解细胞分化状态.蛋白质免疫印迹分析P53的表达.可见光法测定超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活力.结果 LH-36在0.1 μmol/L～10 μmol/L的浓度范围能抑制细胞增殖,且抑制率随浓度和时间的增加而增高.0.1 μmol/L和1.0 μmol/L的LH-36使细胞α-FP mRNA表达量明显下降,Alb表达量增高,P53的蛋白表达明显增加,SOD活性升高(P＜0.01),而CAT活性降低,差异有显著性(P＜0.01,P＜0.05).药物浓度在10 μmol/L作用48 h,BEL-7402细胞皱缩,呈现凋亡各期改变,Caspase-3阳性细胞明显增加,细胞凋亡率显著高于对照组(P＜0.05).结论 胡椒醛缩氨基均三唑席夫碱对人肝癌BEL-7402细胞具有抗增殖、促分化和凋亡作用,作用可能与过氧化氢的氧化损伤作用有关.     

^103Pd粒子对人肝癌细胞—7402细胞毒作用的实验研究

目的 探讨^103Pb粒子对人肝癌细胞-7402的细胞毒作用。方法 以体外培养的人肝癌细胞-7402为研究对象，采用对照分组，体外细胞毒试验（MTT），方差分析，观察^103Pb粒子放疗对肝癌细胞-7402的生长抑制作用。结果 ^103Pd粒子对肝癌细胞-7402的细胞毒作用与照射时间，照射剂量有关，照射时间越长，照射剂量越大，细胞毒作用越强，结论 人肝癌细胞-7402对^103Pd粒子放疗敏感。     

合成紫花茄皂苷对体外培养肝癌细胞的增殖抑制作用

目的:探讨合成紫花茄皂苷对人肝癌细胞株BEL-7402的增殖抑制及凋亡诱导作用。方法:采用酸性磷酸酶(ACP)法检测细胞增殖抑制率;电镜观测BEL-7402细胞形态变化;流式细胞仪检测细胞凋亡率。结果:合成紫花茄皂苷对人肝癌BEL-7402细胞有明显的增殖抑制作用,其72h的IC50为6·5μg/ml。皂苷可引起细胞形态的明显改变。细胞经皂苷作用6h和12h后,凋亡率显著增加。结论:合成紫花茄皂苷对人肝癌细胞的增殖抑制呈浓度相关性,可诱导肿瘤细胞凋亡。     

乙酰肝素酶反义硫代寡脱氧核苷酸对人肝癌细胞系侵袭力的抑制作用

目的探讨乙酰肝素酶反义硫代寡脱氧核苷酸对人肝癌细胞系侵袭力的抑制作用。方法设计合成互补于HPAmRNA起始密码区的硫代反义寡脱氧核苷酸AS-ODN及相应的无义对照寡脱氧核苷酸NS-ODN,以阳离子脂质体OligofectamineTMReagent包埋后转染SMMC-7721、BEL-7402细胞。采用RT-PCR和Western-blot检测转染前后细胞HPAmRNA及蛋白表达的变化,以基底膜重建实验检测SMMC-7721、BEL-7402细胞侵袭力的变化。结果与正常对照组相比,AS-ODN转染组SMMC-7721、BEL-7402细胞HPAmRNA和蛋白的表达均显著下降(P<0.01,P<0.05),转染后两细胞系的侵袭力抑制率分别为55.8%和61.8%。结论HPA硫代反义寡脱氧核苷酸可通过下调HPAmRNA和蛋白的表达抑制肝癌的侵袭力。     

Housefly (Musca domestica L.) control potential of Cymbopogon citratus Stapf. (Poales: Poaceae) essential oil and monoterpenes (citral and 1,8-cineole)

In spite of being a major vector for several domestic, medical, and veterinary pests, the control aspect of the common housefly, Musca domestica L. (Diptera: Muscidae) is often neglected. In the present study, the essential oil of Cymbopogon citratus and its major components were evaluated for control of housefly. The chemical composition analysis of C. citratus oil by gas chromatographic mass spectrometry (GC–MS) revealed citral (47 %) and 1,8-cineole (7.5 %) as principal components. The analysis of oil vapor by solid phase microextraction (SPME/GC–MS) showed increase in citral (74.9 %) and 1,8-cineole (8.6 %) content. Assay of oil against housefly larvae and pupae through contact toxicity assay showed lethal concentration (LC)₅₀ value of 0.41 μl/cm² and of percentage inhibition rate (PIR) of 77.3 %, respectively. Fumigation assay was comparatively more effective with LC₅₀ of 48.6 μl/L against housefly larvae, and a PIR value of 100 % against housefly pupae. The monoterpenes, citral, and 1,8-cineole, when assessed for their insecticidal activity against housefly larvae, showed LC₅₀ of 0.002 and 0.01 μl/cm² (contact toxicity assay) and LC₅₀ of 3.3 and 2.4 μl/L (fumigation assay). For pupicidal assay, both citral and 1,8-cineole had a PIR value of 100 %. High efficacy of citral and 1,8-cineole against housefly, established them to be an active insecticidal agent of C. citratus oil. The study demonstrates potentiality of C. citratus oil as an excellent insecticide for housefly control, and the results open up the opportunity of oil/monoterpenes being developed into an eco-friendly, economical, and acceptable product.     

Fumigant and repellent properties of essential oils and component compounds against permethrin-resistant Pediculus humanus capitis (Anoplura: Pediculidae) from Argentina

The repeated use of permethrin and other insecticides for the control of head lice, Pediculus humanus capitis De Geer (Anoplura: Pediculidae), during past decades has resulted in the development of marked levels of resistance. Thus, new alternative insecticides are needed for the control of head lice. We studied the fumigant and repellent properties of essential oils from 16 native and exotic plants in Argentina, and 21 chemical components against permethrin-resistant head lice from Argentina. With a direct vapor-exposure bioassay, the most effective oil was from the native Myrcianthes cisplatensis Cambess (Myrtaceae) with a time to 50% knockdown (KT50) of 1.3 min, followed by exotic species, Eucalyptus cinerea F.V. Muell., Eucalyptus viminalis Labill., and Eucalyptus saligna Smith. with KT50 values of 12.0, 14.9, and 17.4 min, respectively. The most effective components were 1,8-cineole and anisole, with KT50 values of 11.1 and 12.7 min, respectively. Regression analysis of KT50 values and vapor pressures and water-partition coefficients for the essential oil components revealed that the most effective fumigants were among the more volatile components. Repellency assays indicated that the essential oil from Mentha pulegium L. and its benzyl alcohol component were the most effective repellents, having repellency indices of 75.5 and 57.8%, respectively. Thus, some Argentinean plants contain essential oils and components that function as fumigants or as repellents and thereby show potential for development of new control products for head lice.     

Major essential oils composition and immunotoxicity activity from leaves of Foeniculum vulgare against Aedes aegypti L

The leaves of Foeniculum vulgare (Umbelliferae) were extracted and the major essential oil composition and immunotoxicity effects were studied. The analyses conducted by gas chromatography and mass spectroscopy (GC-MS) revealed the essential oils of F. vulgare leaves. The F. vulgare essential oil yield was 0.97%, and GC/MS analysis revealed that its major constituents were methyl clavicol (46.3%), α-phellandrene (18.2%), fenchone (10.6%), (E)-anethole (11.3%), myrcene (3.4%), and α-pinene (2.1%). The essential oil had a significant toxic effect against early fourth-stage larvae of Aedes aegypti L with an LC(50) value of 41.23?ppm and an LC(90) value of 65.24?ppm. Also, methyl clavicol (≥98.0%), α-phellandrene (≥95.0%), fenchone (≥98.0%), (E)-anethole (≥99.0%), myrcene (≥99.0%), and α-pinene (≥99.0%) were tested against the F(21) laboratory strain of A. aegypti. Fenchone (≥98.0%) and (E)-anethole (≥99.0%) have medium activity with an LC(50) value of 73.11?ppm and 102.41?ppm. The above data indicate that major compounds interaction may play a more important role in the toxicity of essential oil.     

The water-soluble components of the essential oil of Melaleuca alternifolia (tea tree oil) suppress the production of superoxide by human monocytes, but not neutrophils, activated in vitro

OBJECTIVE: To evaluate the regulatory properties of the essential oil of Melaleuca alternifolia (tea tree oil) on the production of oxygen derived reactive species by human peripheral blood leukocytes activated in vitro. MATERIALS AND METHODS: The ability of tea tree oil to reduce superoxide production by neutrophils and monocytes stimulated with N-formyl-methionyl-leucyl-phenylalanine (fMLP), lipopolysaccharide (LPS) or phorbol 12-myristate 13-acetate (PMA) was examined. RESULTS: The water-soluble fraction of tea tree oil had no significant effect on agonist-stimulated superoxide production by neutrophils, but significantly and dose-dependently suppressed agonist-stimulated superoxide production by monocytes. This suppression was not due to cell death. Chemical analysis identified the water-soluble components to be terpinen-4-ol, alpha-terpineol and 1,8-cineole. When examined individually, terpinen-4-ol significantly suppressed fMLP- and LPS- but not PMA-stimulated superoxide production; alpha-terpineol significantly suppressed fMLP-, LPS- and PMA-stimulated superoxide production; 1,8-cineole was without effect. CONCLUSION: Tea tree oil components suppress the production of superoxide by monocytes, but not neutrophils, suggesting the potential for selective regulation of cell types by these components during inflammation.     

Tick repellent substances in the essential oil of Tanacetum vulgare

The repellent effect of the essential oils of flower heads of the aromatic plant tansy, Tanacetum vulgare L. (Asteraceae), originating from Sweden, was tested against host-seeking nymphs of the common tick Ixodes ricinus (L.). The essential oils were obtained by steam distillation (SD) and by using an online solvent extraction separation setup. Further fractionations of the SD oils were obtained by medium-pressure liquid chromatography on silica gel. The volatiles of the essential oils and the fractions that exhibited strong tick repellency (90-100%) were collected by solid phase microextraction and identified by gas chromatography-mass spectrometry. The chemical analyses of the oils show that the populations of T. vulgare from Uppsala and Stockholm may represent different chemotypes, but that they exhibited similar tick repellency. Main volatiles detected from oils of T. vulgare collected at Uppsala were alpha-pinene (27%), beta-pinene (11%), pinocamphone (11%), 1,3,3-trimethylcyclohex-1-ene-4-carboxaldehyde (11%), and 1,8-cineole (10%). In the sample collected in Stockholm, the main components were beta-thujone (39%) and camphor (23%) followed by alpha-thujone (11%) and 1,8-cineole (8%). When constituents in the oils, e.g., alpha-terpineol, 4-terpineol, alpha+beta-thujone, 1,8-cineol, verbenol, and verbenone, were tested separately (each diluted 0.5%, vol:vol), 64-72% tick repellency was obtained.     

Chemical composition and larvicidal evaluation of Mentha, Salvia, and Melissa essential oils against the West Nile virus mosquito Culex pipiens

The volatile metabolites of wild-growing Mentha spicata, M. longifolia, M. suaveolens, Melissa officinalis, Salvia fruticosa, S. pomifera subsp. calycina, and S. pomifera subsp. pomifera from Greece were determined by gas chromatography and gas chromatography–mass spectrometry. The insecticidal properties of the analyzed essential oils were screened on Culex pipiens larvae. Additionally two of the main components of the essential oils, piperitenone oxide and 1,8-cineole were assayed against C. pipiens in order to define the affiliation between them and the larvicidal properties of the oils. The most effective oils were M. suaveolens (major constituent piperitenone oxide, 62.4%), M. spicata (piperitenone oxide, 35.7% and 1,8-cineole, 14.5%) and M. longifolia—Central Greece (piperitenone oxide, 33.4%; 1,8-cineole, 24.5% and trans-piperitone epoxide, 17.4%), which exhibited LC₅₀ values ranging from 47.88 to 59.33 mg l⁻¹. Medium activity revealed the oils of M. officinalis (terpin-4-ol, 15.8%; caryophyllene oxide, 13.2%; sabinene, 12.9%; β-pinene, 12.1%; and trans-caryophyllene, 10.2%), M. longifolia—Southern Greece (carvone, 54.7% and limonene 20.0%), S. pomifera subsp. pomifera (trans-caryophyllene, 22.5% and trans-thujone, 21.0%), S. pomifera subsp. calycina—West Southern Greece (trans-thujone, 56.1% and 1,8-cineole, 10.4%), and S. fruticosa—population 2 (camphor, 23.1%; α-pinene, 12.7%; and borneol, 12.6%), with LC₅₀ values ranging from 78.28 to 91.45 mg l⁻¹. S. pomifera subsp. calycina (Central Greece) essential oil (trans-thujone, 26.5% and cis-thujone, 12.0%) presented rather low activity (LC₅₀ values 140.42 mg l⁻¹), while S. fruticosa—population 1 (1,8-cineole, 31.4% and camphor, 22.6%) was the only inactive oil. Additionally, the constituent piperitenone oxide was found to be highly active (LC₅₀ values 9.95 mg l⁻¹), whereas 1,8-cineole revealed no toxicity.     

雷帕霉素介导丝裂原活化蛋白激酶信号通路对肝癌细胞的影响

目的： 探讨雷帕霉素介导丝裂原活化蛋白激酶（MAPK）信号通路对肝癌细胞Bcl-2、Bcl-xl 及Bax 蛋白表 达的影响。方法：将人肝癌细胞BEL-7402 细胞分为对照组和雷帕霉素处理组（20、50、100 ng/mL）,观察各组 BEL-7402 细胞的形态变化、细胞增殖抑制率、凋亡及蛋白（MAPK、Bcl-2、Bcl-xl 及Bax）表达。结果：随着 雷帕霉素浓度的升高,BEL-7402 细胞呈现崩解和坏死;对照组BEL-7402 细胞增殖抑制率最低,雷帕霉素干预组 BEL-7402 细胞增殖抑制率高于对照组,随着时间及雷帕霉素浓度的升高,细胞生长抑制率逐渐升高;雷帕霉素 处理组与对照组相比差异有统计学意义;随着浓度的升高,BEL-7402 细胞凋亡率升高;对照组BEL-7402 细胞中 MAPK阳性表达率高于雷帕霉素处理组,雷帕霉素处理组随着浓度升高,MAPK阳性表达率不断降低;对照组 BEL-7402 细胞中Bcl-2、Bcl-xl 蛋白升高,与雷帕霉素处理组比较存在显著差异,雷帕霉素处理组Bcl-2、Bcl-xl 蛋白水平随着雷帕霉素的浓度升高而降低,Bax 表达水平随着雷帕霉素的浓度升高而增加。结论：雷帕霉素能 够抑制肝癌细胞增殖,加快坏死及破裂,随着雷帕霉素的浓度升高,凋亡程度增大,其作用机制可能与抑制 MAPK、Bcl-2、Bcl-xl 表达,促进Bax 水平升高有关。     

HBV转染对TWEAK诱导凋亡的影响及IFN-γ对凋亡的调节

目的： 探讨新型凋亡分子TNF-like weak inducer of apoptosis (TWEAK)对乙型肝炎病毒 (HBV)转染的人肝癌细胞系的凋亡诱导作用及γ-干扰素 (IFN-γ)对该凋亡过程的影响。方法: 以稳定转染了pCDNA3/1.1HBV的肝癌细胞系BEL-7402-pCDNA3/1.1HBV为模型,并以稳定转染空载体的肝癌细胞BEL-7402/pcDNA3作为对照,经CCK-8法检测HBV转染前后TWEAK对细胞生长的抑制效应,terminal transferase dUTP nick end labeling (TUNEL)、半胱氨酸天冬氨酸蛋白酶-3(caspase-3)活性检测试剂盒检测HBV转染前后TWEAK诱导肝癌细胞的凋亡情况及IFN-γ对TWEAK诱导细胞凋亡的调节作用。结果: HBV转染促进TWEAK诱导的细胞凋亡, IFN-γ可以增强HBV转染细胞对TWEAK诱导凋亡的敏感性。结论: 机体感染HBV后,TWEAK可能参与HBV感染肝细胞的清除过程;IFN-γ在调节TWEAK诱导的病毒感染细胞凋亡中发挥重要作用。     

Immunotoxicity activity from the essential oils of coriander (Coriandrum sativum) seeds

The seeds of the Coriandrum sativum were extracted and the essential oil composition and immunotoxicity effects were studied. The analysis of the essential oil was conducted by gas chromatography-mass spectroscopy, which revealed 33 components, representing 99.99% of the total oil from the seeds of coriander. The major components are linalool (55.09%), α-pinene (7.49%), 2,6-Octadien-1-ol, 3,7-dimethyl-, acetate, (E)- (5.70%), geraniol (4.83%), 3-Cyclohexene-1-methanol, α,α,4-trimethyl- (4.72%), hexadecanoic acid (2.65%), tetradecanoic acid (2.49%), 2-α-pinene (2.39%), citronellyl acetate (1.77%), and undecanal (1.29%). The seed oil had significant toxic effects against the larvae of Aedes aegypti with an LC(50) value of 21.55?ppm and LC(90) value of 38.79?ppm. The above data indicate that the major components in the essential oil of coriander play an important role as immunotoxicity on the A. aegypti.