吲哚胺2,3-双加氧酶下调HLA-Ⅰ类分子的表达

目的:探讨人类吲哚胺2,3-双加氧酶(IDO)对细胞表面HLA-Ⅰ类分子的影响.方法:用脂质体法将含IDO基因的重组质粒pEGFP-IDO转染293T细胞,用Western blot检测IDOGFP在转染细胞中的表达,荧光抗体染色结合流式细胞术检测细胞表面的HLA-Ⅰ类分子的表达.结果:Western blot证实转染重组质粒的细胞表达IDO.转染空载体的细胞与转染重组质粒的细胞HLA-A,B,C-PE染色的平均荧光强度分别为299.46±62.65及42.51±8.19,两者相比有显著性差异(P＜0.01);转染重组质粒的细胞,未加色氨酸组与色氨酸组HLA-A,B,C-PE染色的平均荧光强度分别为309.17±34.89及692.12±33.42,两者相比亦有显著性差异(P＜0.01).结论:IDO下调细胞表面HLA-Ⅰ类分子的表达,色氨酸能够逆转IDO所致的HLA-Ⅰ类分子的下调.     

人DLL1真核表达质粒的构建及过表达DLL1抑制人口腔鳞癌细胞SCC15的增殖

目的:构建人全长DLL1基因真核表达质粒及过表达DLL1对人口腔鳞癌细胞增殖的影响.方法:PCR扩增人全长DLL1基因,酶切和测序鉴定后克隆至真核表达载体pCMV-Tag4并构建真核重组质粒DLL1/pC MVTag4,瞬时转染HEK293T细胞并通过实时荧光定量PCR(Q-PCR)和Western blot鉴定DLL1的表达;进一步检测DLL1在SCC15等3株人口腔鳞癌细胞中的表达;DLL1/pCMV-Tag4瞬时转染SCC15细胞,Q-PCR和Western blot检测过表达及MTT检测DLL1过表达对细胞SCC15增殖的影响.结果:真核重组质粒DLL1/pCMV-Tag4在HEK293T细胞中成功表达;DLL1在口腔鳞癌细胞中的表达高于正常口腔细胞;DLL1/pCMV-Tag4在SCC15细胞中获得表达且过表达DLL1抑制SCC15细胞的增殖.结论:人全长DLL1分子在HEK293T及SCC15细胞中获得表达,过表达DLL1抑制口腔鳞癌细胞SCC15的增殖.     

人PSF真核表达载体构建及其在CHO细胞中的表达

目的是构建人PSF基因真核表达载体pEGFP-N1-PSF,并在检测其在CHO细胞株中的表达情况。应用DNA重组技术和PCR方法从人宫颈癌Hela细胞中扩增PSF基因,插入pEGFP-N1真核表达载体,构建重组质粒pEGFP-N1-PSF并测序鉴定。将pEGFP-N1-PSF瞬时转染CHO细胞,通过Western blot和RT-PCR方法检测PSF的表达,荧光显微镜下观察绿色荧光蛋白表达。结果 CHO细胞转染pEGFP-N1-PSF真核表达载体后,RT-PCR和Western blot实验发现,在RNA和蛋白水平有PSF的表达,在荧光显微镜下可以观察到融合蛋白EGFP/PSF的表达。成功构建pEGFP-N1-PSF真核表达载体,证实其在CHO细胞中可以表达。     

Construction of Eukaryotic Expression Vector of Human PSF and Identification of its Expression in CHO Cell Line

目的是构建人PSF基因真核表达载体pEGFP-N1-PSF,并在检测其在CHO细胞株中的表达情况.应用DNA重组技术和PCR方法从人宫颈癌Hela细胞中扩增PSF基因,插入pEGFPNL真核表达载体,构建重组质粒pEGFP-N1-PSF并测序鉴定.将pEGFP-N1-PSF瞬时转染CHO细胞,通过Western blot和RT-PCR方法检测PSF的表达,荧光显微镜下观察绿色荧光蛋白表达.结果CHO细胞转染pEGFP-N1-PSF真核表达载体后,RT-PCR和Western blot实验发现,在RNA和蛋白水平有PSF的表达,在荧光显微镜下可以观察到融合蛋白EGFP/PSF的表达.成功构建pEGFP-N1-PSF真核表达载体,证实其在CHO细胞中可以表达.     

表达肿瘤抗原HPV-58 E7的HLA-A*0201阳性宫颈癌细胞模型的构建和鉴定

为建立内源性表达58型人乳头瘤病毒(Huamn papillomavirus type 58,HPV-58)重要癌抗原E7蛋白的HLA-A*0201阳性人宫颈癌细胞模型.以HPV-58全基因组为模板,采用PCR法扩增E7蛋白的编码基因,构建真核表达载体pEGFP-N2-HPV58E7;转化大肠杆菌DH5α,通过DNA测序鉴定质粒载体;经除内毒素纯化后,将大量制备的重组质粒瞬时转染293T细胞,采用RT-PCR和细胞免疫荧光方法研究重组质粒在人源细胞中的表达情况;最后,选择HPV检出阴性的HLA-A*0201阳性人宫颈癌C33A细胞株为宿主细胞,采用脂质体转染、G418抗性加压筛选和细胞克隆化培养技术,建立能够稳定表达HPV-58 E7的恒定转染细胞株.采用RT-PCR、Western-blot和细胞增殖测定等方法从转录、翻译和表型等3个层次对所建细胞株进行鉴定研究.研究结果显示:克隆制备了HPV-58 E7蛋白的编码基因;构建获得了能够在人源细胞中表达HPV58E7-EGFP融合蛋白的真核表达质粒;并成功建立了能够稳定表达HPV-58 E7的HLA-A*0201阳性人宫颈癌细胞模型;核酸和蛋白水平的鉴定结果表明所建模型细胞能够表达HPV-58 E7癌抗原,宿主细胞本身表达的Ⅰ类组织相容性抗原HLA-A*0201有望通过内源性抗原加工途径将E7抗原的细胞毒性T细胞(Cytotoxic lyphocyte,CTL)表位提呈到细胞表面;另外,细胞增殖试验结果亦表明该细胞模型体现出E7蛋白显著的诱导细胞增殖的生物学特征.总之,能够稳定表达HPV-58 E7癌蛋白的HLA-A*0201阳性人宫颈癌细胞模型的建立为后续即将展开的以HPV-58 E7为靶标的宫颈癌治疗性疫苗和药物的寻找和研究奠定基础.     

柔嫩艾美耳球虫Serpin基因在293T细胞中的表达

为了检测柔嫩艾美耳球虫(Eimeria tenella,Et)丝氨酸蛋白酶抑制剂(Serine protease inhibitor,Serpin)基因(EtSerpin)在真核细胞293T中的表达情况,以Et孢子化卵囊cDNA为模板,经PCR扩增含完整Serpin开放阅读框的序列,将其克隆至pGEM-Teasy载体,构建pGEM-Teasy-EtSerpin质粒,双酶切回收目的片段后与相应酶切的真核表达载体pCAGGS连接,构建真核重组表达质粒pCAGGS-EtSerpin.该重组质粒经酶切和测序鉴定正确后转染293T细胞,用间接免疫荧光法和Western blot鉴定EtSerpin基因的表达情况,间接免疫荧光实验可以检测到红色荧光,Western blot结果显示出大小约45.5kDa的目的蛋白条带,结果表明构建的EtSerpin可以在293T细胞中获得表达.     

鼠白细胞介素15真核表达质粒的构建及活性鉴定

从经PMA刺激的小鼠脾细胞中提取总RNA, 采用RT-PCR技术获得鼠白细胞介素15(mIL-15)基因, 将其克隆至真核表达质粒VR1012中, 转染COS-7细胞, 将转染细胞裂解, Western blot检测. 表明获得了mIL-15真核表达载体, 其具有完整的带有信号肽的mIL-15序列, 重组结果正确, Western blot检测阳性. 并获得有生物活性的mIL-15蛋白.     

趋化素样因子1对肾癌细胞ACHN生物活性的影响及其相关机制

通过质粒转染实现趋化素样因子1(Chemokine-like Factor 1,CKLF1)在肾癌细胞ACHN中过表达, 探究CKLF1对肾癌细胞ACHN细胞增殖和凋亡的影响及机制研究。方法：将实验组pEGFP-N1-CKLF1和对照组pEGFP-N1真核细胞表达质粒分别转染肾癌ACHN细胞,实现趋化素样因子1在ACHN细胞中的过表达。利用荧光显微镜,镜下观察质粒转染效率。利用CCK8实验观察肾癌细胞ACHN转染24、48、72小时后增殖情况;利用流式细胞术检测ACHN细胞转染24、48、72小时后细胞周期的变化情况;利用Hoechst33258染色法观察转染48小时后, ACHN细胞形态变化,利用流式细胞术检测各组细胞凋亡率。采用Western blot法检测CKLF1过表达后,蛋白Cyclin D1、、Bcl-xL、STAT3、P-STAT3表达情况。结果: 1、荧光显微镜下90%以上的细胞有绿色荧光蛋白表达,证明转染效率良好。2、CCK8检测结果显示：转染48、72小时后,实验组肾癌细胞ACHN的增殖情况均明显高于对照组,差异有显著性意义48小时(P ＜0.05),72小时（P ＜0.05）;3、流式细胞术检测结果显示：实验组增值指数PI明显高于对照组, 差异有显著性意义24h(P ＜0.01),48h(P ＜0.01),72h (P ＜0.01) 。4、 荧光显微镜下Hoechst 染色结果显示：与对照组相比较,实验组凋亡小体数量较少。流式细胞术检测结果显示,与对照组相比较,转染后48小时后实验组细胞凋亡率明显降低（P ＜0.05）。5、Western blot结果: 与对照组相比较,周期相关蛋白Cyclin D1表达明显高于对照组,差异有显著性意义（P＜0.05）;实验组凋亡相关蛋白Bcl-xL表达量明显高于对照组（P ＜0.05）;实验组JAK-STAT信号通路蛋白P-STAT3明显高于对照组（P＜0.05）。 结论：趋化素样因子1过表达可促进肾癌细胞ACHN的增殖、抑制其凋亡,其发生机制可能与JAK-STAT信号通路有关。CKLF1可能是肾透明细胞癌的新的治疗靶点。     

LC3真核表达载体构建及其在293T细胞中自噬诱导研究

【目的】构建pEGFP-N1-LC3真核表达载体,并将其转染进人胚肾细胞293T,通过Earle's盐平衡液(Balanced salt solution,EBSS)饥饿诱导观察细胞自噬现象。【方法】RT-PCR扩增LC3基因,并将其插入pEGFP-N1真核表达载体构建重组质粒。将重组质粒转染至人胚肾细胞293T,显微镜观察、Western blot检测GFP-LC3融合蛋白表达情况。对转染细胞进行Earle's盐平衡液饥饿诱导,通过Western blot验证自噬指标,激光共聚焦显微镜观察自噬泡形成。【结果】成功构建pEGFP-N1-LC3真核表达载体,并在293T细胞中成功表达目的蛋白,在进行Earle's盐平衡液饥饿诱导后观察到自噬泡的形成,Western blot检测到LC3-Ⅰ向LC3-Ⅱ的转化。【结论】本实验为研究自噬在癌细胞病理进程中的机制提供了实验素材。     

表达大鼠FoxA1的慢病毒制备和鉴定

通过PCR扩增获得大鼠FoxA1的cDNA,构建慢病毒重组载体plv-rFoxA1-IRES-EGFP,并瞬时转染293T细胞观察绿色荧光蛋白(GFP)的表达及Western blot检测FoxA1的表达.通过钙转将该重组载体与辅助质粒△8.91,pVSV-G共转染293T细胞制备慢病毒.研究结果表明,大鼠FoxA1慢病毒质粒成功构建,并且证实所制备的慢病毒能感染细胞,使细胞有效表达FoxA1蛋白,为FoxA1的功能研究奠定了材料基础.     

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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