3-MA 对阿霉素诱导 K562、K562 / ADM 细胞凋亡及其相关基因 mRNA 表达的影响

目的：通过自噬抑制剂3-甲基腺嘌呤（3-MA）对阿霉素（ADM）诱导白血病K562细胞及K562／ADM细胞的细胞效应和自噬基因Beclinl、凋亡抑制基因SurvivinmR．NA表达的变化观察,探讨自噬在细胞凋亡中的作用和机制．方法：体外培养K562和K562／ADM细胞,采用MTT法分别检测ADM及3-MA预处理对K562、K562／ADM细胞增殖的影响,流式细胞仪检测细胞凋亡率,实时RT—PCR法检测细胞自噬及凋亡相关基因（Beclinl、Survivin）mRNA表达的变化．结果：ADM可抑制K562与K562／ADM细胞增殖,且抑制作用呈现浓度与时间依赖性．ADM诱导组K562与K562／ADM细胞在24h、48h、72h细胞凋亡率均较空白对照组明显提高（P〈0．05）．在ADM诱导前,经3-MA预处理可使ADM诱导的K562与K562／ADM细胞抑制率和细胞凋亡率均较单用ADM显著提高（尸〈0．05）,Bedin1、SurvivinmRNA相对表达量均较单用ADM明显下降（P〈0．05）,呈正相关（r=0．827,P〈0．01）．结论：ADM可抑制K562、K562／ADM细胞的生长,并诱导细胞凋亡．3-MA通过抑制细胞的自噬可增强ADM诱导白血病细胞K562、K562／ADM的凋亡,其机制可能与下调BeclinlmRNA表达,而使Survivin表达受抑制有关．     

选择性COX-2抑制剂尼美舒利对白血病K562细胞增殖的影响

目的:观察选择性COX-2抑制剂尼美舒利对人类骨髓白血病K562细胞增殖和凋亡的影响。方法:分别以尼美舒利25、50、100μg.mL-1体外处理骨髓白血病K562细胞,采用MTT比色法、流式细胞仪分析技术及DNA片段凝胶电泳等方法,检测尼美舒利对K562细胞增殖和凋亡的影响。结果:尼美舒利剂量依赖性地抑制K562细胞增殖,其中等剂量组(50μg.mL-1)的抑制作用强于阿霉素组(25μg.mL-1);尼美舒利可诱导细胞凋亡,使细胞阻滞于G0/G1期,S期细胞明显减少,其诱导细胞凋亡的作用也呈剂量依赖性(剂量由低至高,凋亡率分别为(3.4±2.8)%,(16.8±1.8)%和(42.7±2.5)%;DNA条带分析也进一步证实了尼美舒利的促凋亡作用。结论:尼美舒利在体外可显著抑制K562细胞增殖,该作用可能与其干扰细胞周期、诱导细胞凋亡有关。     

土贝母苷甲诱导人红白血病细胞K562凋亡

用MTT法检测苷甲对K562细胞生长的抑制作用,分别采用形态学方法(光学显微镜、倒置显微镜、荧光显微镜)检查在苷甲作用下K562细胞形态的变化以及用流式细胞术观察在苷甲作用下K562细胞凋亡及周期变化的情况.结果显示:苷甲抑制K562细胞的生长,其24、48、72h的IC50值分别为19.7、18.5、15.9μmol/L.苷甲诱导K562细胞出现典型凋亡细胞的形态学特征.20μmol/L苷甲作用K562细胞6 h,流式细胞仪即检出亚倍体峰,G2/M期细胞增多.随着作用时间延长,细胞被阻滞于G2/M期更加明显,细胞的凋亡率也增加.该实验证明:苷甲能抑制K562细胞的生长,把细胞阻滞在G2/M期并诱导细胞发生凋亡.     

依地福新抑制Jurkat细胞生长机制的研究

目的观察依地福新对体外培养的Jurkat细胞的生长抑制作用,并进一步探讨其作用机制。方法应用MTT法检测细胞增殖活性;流式细胞仪检测细胞周期分布;Annexin V—FITC染色法检测细胞凋亡率。结果不同浓度依地福新处理Jurkat细胞24～96h后,细胞增殖显著受到抑制,并呈现浓度及时间依赖性;1．0μmol／L、5．0ymol／L、10．0μmol／L依地福新处理72h后,Jurkat细胞G0／G1期细胞数量显著增加,S期细胞数量显著降低（P〈0．01）;各浓度组细胞凋亡率均显著增加（P〈0．01）。结论依地福新对Jurkat细胞具有生长抑制作用,其机制与阻滞细胞周期及诱导凋亡有关。     

石蒜碱对人白血病细胞K562凋亡作用的研究

为了研究石蒜碱对人白血病细胞K562的凋亡作用,采用MTT法检测石蒜碱对K562细胞的细胞毒作用,数据表明石蒜碱对K562细胞的IC50为16.000μmol/L.流式细胞仪检测石蒜碱对K562细胞凋亡率的影响,数据表明给药剂量越大,其凋亡率越高,凋亡率与给药剂量呈依赖关系.激光共聚焦扫描显微镜检测石蒜碱对K562细胞膜电位的影响,数据表明随着给药剂量增大,膜电位逐渐降低,且成剂量依赖关系.结果显示石蒜碱能够诱导K562细胞凋亡并使其膜电位降低.     

微波对K562/MDR细胞凋亡及热休克蛋白70表达的影响

研究微波引起白血病耐药细胞株K562／MDR的凋亡以及对热休克蛋白70表达的影响。使用MTT方法检测细胞存活率，AnnexinV/PI双参数法检测K562／MDR细胞的凋亡率，流式细胞仪检测热休克蛋白70的表达。结果表明，微波可起K562／MDR细胞的凋亡，经0.20,0.60W/cm^2功率密度微波作用20min（保持43℃），37℃培养24h后，细胞凋亡率分别为10％、13．6％，而水浴加热引起的凋亡率仅为3．8％，微波照射影响细胞内热休克蛋白70的表达，在43℃时，0.20,0.60W/cm^2功率密度微波作用20min抑制HSP70的表达，实验说明微波能引起K562／MDR细胞的凋亡，该凋亡与微波引起的热休克蛋白表达的改变可能有联系。     

石蒜碱诱导人白血病K562细胞凋亡的研究

为研究石蒜碱诱导白血病K562细胞凋亡机制,采用体外细胞培养方式,通过CCK-8法描绘细胞生长曲线,测定细胞增殖活性,CCK-8结果显示石蒜碱能够抑制K562细胞生长,且呈现剂量依赖性,其IC50=4.13μmol/L.倒置显微镜进行细胞形态学观察,石蒜碱作用细胞后,细胞形态学发生改变.PI单染法检测细胞凋亡率,数据显示,石蒜碱诱导K562细胞的凋亡率与给药剂量呈正相关.Western-blot法检测P53蛋白表达情况,随着石蒜碱浓度的增加,P53活性增强(P0.05).结果显示,石蒜碱抑制白血病K562细胞增殖,诱导细胞凋亡,其凋亡诱导作用可能与细胞内P53基因的表达有关.     

羟基喜树碱联合丝裂霉素诱导人白血病K562细胞凋亡

观察羟基喜树碱与丝裂霉索联合应用对人白血病细胞K562的作用效果,并探讨其机制。不同浓度羟基喜树碱与丝裂霉素单独及联合作用于人白血病细胞K562后,应用台盼蓝拒染法检测细胞生长抑制率,计算合用指数（CI）,流式细胞仪（FCM）检测K562细胞凋亡率,吖啶橙（AO）荧光染色和透射电镜观察凋亡形态学变化。结果表明：单独应用时羟基喜树碱和丝裂霉素的IC50分别是8μ/mL和12．5μg/mL,联合应用时IC50下降为4μg/mL（HCPT）和3．6μg/mL（MMC）,CI=0．78,为协同效应。羟基喜树碱与丝裂霉素单独及联合应用均可诱导K562细胞凋亡。2种药物联合应用时的凋亡率高于各自单独用药。羟基喜树碱与丝裂霉素联合应用可以通过共同诱导细胞凋亡。协同抑制人白血病细胞生长。     

吲哚乙酸结合辣根过氧化物酶对K562细胞增殖的影响

应用MTT实验、细胞计数法检测吲哚乙酸结合辣根过氧化物酶,流式细胞仪(FCM)和DNA末端标记法(TUNEL)检测IAA/HRP对细胞增殖周期和细胞凋亡的作用,研究了吲哚乙酸(indole-3-acetic acid IAA)结合辣根过氧化物酶(horseradish peroxidase HRP)对K562细胞增殖的影响.结果表明,与对照组相比,IAA和HRP单独处理组对K562细胞的生长具有部分抑制作用,但无显著性差异;而IAA与HRP结合后对K562细胞的抑制作用明显增强.流式细胞仪检测结果表明,K562细胞阻滞于G2/M期.IAA/HRP具有明显的诱导K562细胞凋亡的作用,且诱导凋亡的作用与IAA浓度呈正相关(r=0.971,P<0.01).IAA/HRP能明显抑制K562细胞生长,将细胞周期阻滞于G2/M期,诱导细胞凋亡.     

Sorafenib联合重组人可溶性TRAIL蛋白对K562细胞增殖抑制和凋亡诱导的研究

目的观察比较联合应用重组人可溶性TRAIL蛋白及Sorafenib于人慢性髓系白血病细胞株K562与单独应用时细胞增殖抑制及诱导凋亡的差异。方法通过CCK-8法检测两者对K562细胞的增殖抑制作用;Western-Blot分析TRAIL或与Sorafenib联用对K562细胞的凋亡诱导作用。结果 Sorafenib与TRAIL联合作用于K562细胞时,其细胞的增殖抑制率及凋亡率均显著高于二者单独应用。结论 Sorafenib与TRAIL对K562细胞的增殖抑制及凋亡诱导有增敏及协同作用。     

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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