培养细胞体系中槐定碱抗EV71病毒的作用

探究槐定碱抗EV71病毒的作用,为防治手足口病提供线索。在体外培养的Vero细胞体系中加入槐定碱,用MTT法检测其细胞毒性;在病毒感染的不同时期用槐定碱处理,用MTT法检测细胞存活率、细胞病变等指标,表征其对EV71病毒吸附、穿入的抑制作用及直接杀灭作用;用RT-PCR法检测其对于病毒RNA复制的抑制作用。(1)槐定碱具有一定细胞毒性,其CC50为1.414mg/m L;(2)能够抑制病毒对Vero细胞的感染,其IC50=0.354mg/m L;(3)其机制可能是抑制病毒的吸附和RNA复制,但对病毒穿入的抑制作用较弱。槐定碱可抑制病毒吸附和病毒增殖,在病毒感染前后用药效果都较好,且有效浓度远小于其CC50值,作为防治手足口病药物的开发潜力较大。     

韭菜(Allium tuberosum Rottler.ex Spreng.)凝集素的细胞凝集和糖抑制作用

从韭菜叶片组织分离的韭菜凝集素具有凝集细胞的作用。在测试的红细胞中能凝集小鼠、豚鼠、兔的红细胞,其中对兔的红细胞凝集活性最高。韭菜凝集素还能凝集小鼠S_(180)肉瘤细胞、大鼠W_(258)肿瘤细胞,人的Hela肿瘤细胞和MGC_(80-3)胃癌细胞、小鼠和大鼠的骨髓细胞以及牛精子细胞,而不凝集小鼠艾氏肿瘤细胞、小鼠和大鼠的脾脏淋巴细胞。韭菜凝集素的血凝活性可被D—甘露糖、D—半乳糖和D—松二糖所抑制。     

去甲斑蝥素抑制胃癌MGC-803细胞生长并诱导其凋亡

目的:探讨去甲斑蝥素对胃癌MGC-803细胞的抑制作用及其可能的作用机制。方法:噻唑蓝（MTT）法及克隆形成抑制实验观察去甲斑蝥素对胃癌MGC-803细胞的生长抑制作用,碘化丙锭（propidium iodide,PI）单染色检测细胞周期改变,膜连蛋白-异硫氰酸荧光素（Annexin V-FITC/PI）双染流式细胞术检测细胞凋亡水平,Western blotting检测凋亡相关蛋白的表达。结果:去甲斑蝥素作用MGC-803细胞后,不同浓度的去甲斑蝥素对胃癌细胞的生长均有抑制作用,且呈剂量-效应关系（P<0.05）,去甲斑蝥素作用于胃癌MGC-803细胞48 h和72 h的IC₅₀浓度分别为69.92μmol/L和31.27μmol/L;与对照组相比随着去甲斑蝥素的浓度增加,细胞克隆逐渐减少;细胞周期检测结果显示,随着去甲斑蝥素浓度的增加,胃癌MGC-803细胞出现明显G2/M期阻滞;不同浓度去甲斑蝥素作用后,出现明显的凋亡细胞群;Western blotting检测结果显示,去甲斑蝥素处理组细胞的Bcl-2蛋白家族中抗凋亡蛋白Bcl-2、Bcl-xL、Mcl-1表达明显降低,促凋亡蛋白Bax表达基本不变。Casepase-9、Caspase-3活化降解,PARP蛋白出现切割条带。结论:去甲斑蝥素能够抑制胃癌MGC-803细胞生长,使细胞周期抑制在G2/M期,并通过线粒体凋亡途径诱导细胞发生凋亡。     

花椰菜(Brassica oleracea var.botrytis L.)凝集素的细胞凝集和糖抑制作用的研究

花椰莱(Brassica oleracea var. botrytis L.)凝集素能凝集兔、大鼠和小鼠的红细胞,其中对兔的红细胞的凝集活性最高,最低凝集浓度为0.68μg/ml。但不凝集我们所测试的其它16种红细胞。浓度为0.1mg/ml时,花椰菜凝集素也能凝集小鼠艾氏腹水瘤细胞,S_(180)肉瘤细胞,大鼠W_(256)肿瘤细胞、人的MGC_(80-3)胃癌细胞、小鼠和大鼠的脾脏淋巴细胞、骨髓细胞以及牛精子细胞,而不凝集人的Hela细胞。该凝集素对免的红细胞的凝集活性可被L—鼠李糖和D—树胶醛糖所抑制,最低抑制浓度分别为33.3m mol/L和16.7m mol/L。     

MTT法检测大豆异黄酮对癌细胞的生长抑制作用

本文选择小鼠红白血病细胞系CML-K562和大鼠肝癌细胞系CBRH-7919作为大豆异黄酮的作用对象,通过MTT法检测大豆异黄酮对CML-K562和CBRH-7919的抑制作用.结果显示,大豆异黄酮对小鼠红白血病细胞系CML-K562和大鼠肝癌CBRH-7919细胞生长均有抑制作用,其抑制率达到50%时,所需要的用量即IC50分别为15.36 mg/L和16.58 mg/L.     

茜草蒽醌对肝癌SMMC-7721细胞增殖的抑制作用

目的探讨茜草提取物蒽醌单体对人肝癌SMMC-7721细胞增殖的抑制作用.方法采用MTT法、形态学、集落形成法,检测蒽醌对人肝癌细胞增殖的抑制结果.结果MTT法显示各个浓度的蒽醌对肝癌SMMC-7721细胞的增殖均有抑制作用,呈现出与药物浓度、作用时间的依赖性;生长曲线由＂S＂型逐渐变得低平;倒置显微镜下可见药物组细胞数减少,间隙增大,细胞间出现＂接触性抑制＂;集落形成率降低（P〈0.01）,集落中细胞数减少.结论茜草蒽醌对人肝癌SMMC-7721细胞生长具有抑制作用;蒽醌有可能成为抗肝癌新药,为抗癌新药的开发提供理论与实验依据.     

PPAR-α激动剂非诺贝特抑制前列腺癌PC-3细胞生长和诱导凋亡的作用研究

探讨过氧化物酶体增殖因子激活受体α(PPAR-α)激动剂非诺贝特对前列腺癌PC-3细胞生长的抑制和诱导凋亡的作用。分别用0、25、50、75、100μmol/L浓度的非诺贝特作用于PC-3细胞,经过24 h、48 h、72 h后,分别采用MTT、Western blot检测不同组别PC-3细胞的生长或凋亡情况。MTT结果显示:非诺贝特对PC-3细胞的增值存在显著的抑制影响,并且抑制效果和所加入的溶液浓度存在正相关性;流式细胞结果表明:非诺贝特经过24 h、48 h及72 h处理后,测定得到的凋亡细胞总百分比分别为8.41%±2.05%、16.77%±3.16%和23.65%±4.43%,较对照组4.65%±1.12%明显升高。Western blot的检测结果显示:50μmol/L非诺贝特处理PC-3细胞,48 h后其凋亡因子Caspase 3和AIF的表达均有明显的增加。据此,非诺贝特能够显著激活前列腺癌PC-3细胞凋亡因子Caspase 3和AIF的表达,实现诱导细胞凋亡,从而表现出对PC-3细胞增殖的抑制作用。     

茶氯香酰胺脂质体对人肝癌细胞生长和迁移的抑制作用

以茶氯香酰胺脂质体(TClC-L)为研究对象,研究其对人肝癌细胞(SMMC7721)生长和迁移的影响,并且探索其作用的分子机制,为研发抗肝癌新药提供科学依据.应用MTT法检测TClC-L对SMMC7721细胞生长的影响;应用划痕法和细胞流式分别检测TClC-L对SMMC7721细胞迁移和死亡的影响;应用Hoechst 33258染色检测SMMC7721细胞凋亡形态学变化;应用Western blotting技术检测TClC-L对SMMC7721细胞生长、凋亡和迁移密切相关蛋白表达的影响和其可能作用的分子机制.结果显示,TClC-L对SMMC7721细胞生长有显著的抑制作用,显示出剂量和时间的依赖性关系; TClC-L能够显著地降低SMMC7721细胞的迁移能力,促进其凋亡; TClC-L显著上调抑制肝癌细胞生长和诱导癌细胞凋亡的相关蛋白因子Bax、Caspase-3、PARP和迁移抑制因子E-cadherin蛋白的表达水平,下调促进细胞生长和迁移以及抗凋亡的相关蛋白因子Bcl-2、HGF、cMet、NF-κB、MMP9、VEGFR2、c-Myc蛋白的表达水平. TClC-L抑制人肝癌细胞SMMC7721的生长和迁移作用的分子机制涉及到HGF/c-Met/VEGFR-NF-κB信号通路.     

ING4及IL-24双基因共表达腺病毒载体对MG-63人骨肉瘤细胞体外抑癌增效作用研究

目的用人肿瘤生长抑制因子(mING4)及人白介素24(IL-24)基因构建腺病毒双基因共表达载体(Ad-ING4-IL-24),并设Ad-ING4和Ad-IL-24单基因对照,研究双基因共表达载体对MG-63人骨肉瘤细胞体外抑癌增效作用.方法首先将已构建成功的Ad-ING4-IL-24,Ad-ING4及Ad-IL-24腺病毒感染QBI-293A细胞,经多轮扩增后获得高滴度的病毒子,测病毒效价后分别以100 MOI剂量感染MG-63细胞,用荧光显微镜、RT-PCR法检测ING-4及IL-24在MG-63细胞中的转录和表达;MTT法检测ING-4及IL-24基因表达对MG-63细胞的生长抑制效应;半定量RT-PCR法检测ING4及IL-24基因表达对MG-63细胞中的Bcl-2,Bax,Caspase3,p21,CD34等相关基因表达的影响.结果获得了高滴度的重组腺病毒Ad-ING4-IL-24,Ad-ING4,Ad-IL-24和Ad-GFP;治疗后MG-63细胞中ING-4及IL-24双基因表达对MG-63细胞增殖有明显抑制作用,ING-4及IL-24基因表达可通过上调细胞中Bax,Caspase3,p21和下调Bcl-2,CD34基因表达诱导细胞凋亡.在病毒子剂量为100 MOI时,Ad-ING4-IL-24对MG-63人骨肉瘤细胞抑制作用比对Ad-ING4和Ad-IL-24抑制效果更为显著.结论腺病毒介导的ING4或/和IL-24基因可明显抑制MG-63人骨肉瘤细胞的生长,且Ad-ING4-IL-24双基因比Ad-ING4和Ad-IL-24单基因的抑制效果更为显著,该现象可能是通过改变Bcl-2,Bax,Caspase3,p21,CD34基因表达水平来发挥抗肿瘤作用的.     

二去水卫矛醇对四种肿瘤细胞的体外抑制作用

采用噻唑蓝(MTT)比色法检测不同浓度二去水卫矛醇(DAG)对人胃癌细胞SGC-7901、人肺癌细胞H460、人鼻咽癌细胞CNE和人肝癌细胞BEL-7404的抑制率研究DAT对4种肿瘤细胞的体外抑制作用.结果表明,DAG对4种癌细胞:CNE、H460、SGC-7901和BEL-7404有较强的抑制作用,作用72h后半数抑制浓度(72h-IC50)分别为4.12μg· ml-1,15.98μg·ml-1,16.00μg· ml-1和16.73μg·ml-1.显微镜下可见经药物作用后细胞圆缩、胞质浓缩、胞浆内颗粒集中边缘化甚至细胞溶解等损伤现象.DAG在体外对上述4种癌细胞有明显的抑制生长作用.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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