EB病毒及化学致癌物DNP对人胚鼻咽粘膜裸鼠移植的诱癌研究

用EBV,DNP及PMA分别或协同对人胚鼻咽粘膜裸鼠移植物进行诱癌研究,探讨上述因素在人实验性鼻咽癌发生中的作用。免疫荧光法检查证实,经B95-8上清液体外及体内转染的人胚鼻咽粘膜上皮表达EBNA。实验结果显示,实验各组均可见各种增生性改变,对照组仅见一般增生性病变。各诱癌组均可见癌前病变,组间无显著性差异。共出现癌8例(1)EBV组:原位癌1例。 (2)EBV+PMA组:早期浸润癌1例。(3)EBV+DNP组:原位癌及浸润癌各1例。(4)EBV+DNP+PMA组:浸润癌1例。 (5)DNP组:原位癌1例。(6)DNP+PMA组:原位癌及浸润癌各1例。结果提示EBV可能在人鼻咽上皮实验性癌变过程中起病因作用。本研究成功诱发了三例浸润癌,均系DAP与其它因素(PMA、EBV)协同作用,提示人鼻咽癌的发生可能与多种致癌因素的相互作用有关。     

EGFR在鼻咽癌临床分期中的作用

目的探讨EGFR在鼻咽癌临床分期中的作用。方法将鼻咽未分化非角化癌60例及鼻咽良性病变(慢性鼻咽炎及腺样体组织)30例的病理组织,利用免疫组化二步法检测其中EGFR的表达情况,结果经IPP6.0进行图像分析,并将检测结果与临床病理特征进行综合分析。结果 EGFR在鼻咽癌及慢性鼻咽炎病理组织中,都存在EGFR的表达,并在鼻咽未分化非角化癌组织中高表达,其MOD(EGFR)与鼻咽良性病变组织相比,存在显著性差异(p=0.0040.01),并且MOD(EGFR)与鼻咽癌的临床分期存在正相关性,相关系数0.786,鼻咽癌组织EGFR的表达与T分期正相关,相关系数0.722,与N分期存在一定相关性,N2与N3之间MOD(EGFR)无显著性差异(p0.05),剩余组间比较均有统计学意义(p0.05),并且MOD(EGFR)随着N分期的升高,有逐渐升高的趋势,但N分期与MOD(EGFR)的相关系数仅为0.250;结论在鼻咽癌及鼻咽良性病变病理组织中,都存在EGFR的表达,但在鼻咽癌组织中高表达,EGFR表达可能与鼻咽癌肿瘤细胞增殖活跃度密切相关;鼻咽病理组织中EGFR的免疫组化测定作为一种判断鼻咽肿瘤细胞增殖情况的指标,在临床中值得推广     

Cyclin D1与p21WAF1在鼻咽癌中的表达

目的探讨鼻咽上皮癌变过程中周期蛋白CyclinD1与抑癌基因p21（wild—type p53 activated fragment 1,p21wAF1）蛋白的表达及其意义。方法应用免疫组化方法检测47例鼻咽癌组织、21例癌旁上皮组织和14例正常鼻咽粘膜中Cyclin D1与p21WAF1蛋白表达。结果从鼻咽正常粘膜、癌旁粘膜上皮组织到癌组织,Cyclin D1表达阳性率逐渐增加,并且差异有显著意义（均为P〈0．05）。p21WAF1蛋白在以上组织中阳性率较高,且各组间差异无显著性。结论Cyclin D1、p21WAF1蛋白与鼻咽部上皮细胞恶性增生密切相关,p21wA兀蛋白表达可能与细胞周期调控的反馈机制有关。     

MDV感染B19、B21单倍型SPF鸡免疫器官中miR-146b-5p的变化规律

目的分析miR-146b-5p在B19(MD易感)与B21(MD抗性)单倍型鸡感染MDV后的表达变化规律,并探讨其可能与MD抗性/易感性相关的分子机制。方法我们在MDV超强毒株Md5攻毒实验和前期高通量测序分析发现,miR-146b-5p表达量有明显差异,为此进一步利用实时荧光定量PCR技术,检测MD感染B19和B21单倍型鸡5dpi、10dpi和21dpi,miR-146b-5p在法氏囊、胸腺和脾脏组织中的表达量变化情况。结果 miR-146b-5p在5dpi、10dpi和21dpi实验组和对照组的表达量明显不同,miR-146b-5p在B21实验组中的表达量要远高于对照组,且差异显著;而miR-146b-5p在B19实验组中的表达量高于对照组但差异不显著。结论 MD感染后,在不同免疫器官中miR-146b-5p的表达量可能存在组织特异性,不同鸡系之间在感染后也存在一定的差异,但具体机制尚需进一步深入研究。     

干扰长链非编码RNA Z38表达对鼻咽癌细胞增殖的影响

新型的长链非编码RNA Z38已证实高表达于肿瘤组织,低表达于癌旁组织,属于癌基因,但其功能和作用机制尚需深入分析。研究目的在于探讨稳定干扰长非编码RNA Z38对鼻咽癌细胞HNE1、5-8F功能和机制的影响。采用慢病毒包埋Z38-shRNA转染进人鼻咽癌细胞HNE1与5-8F,用嘌呤霉素筛选出稳定的干扰细胞系,利用相对实时荧光定量的方法检测干扰效率;使用MTT、和平板克隆集落形成实验验证其对HNE1、5-8F细胞增殖的抑制作用;Transwell检测细胞迁移的能力;采用Western Blot检测干扰Z38表达对抑癌因子P~(53)、P~(21)表达水平的影响。结果表明,慢病毒干扰鼻咽癌细胞显著降低了Z38基因表达水平,并且干扰Z38基因表达后使细胞增殖能力、细胞集落形成能力降低,穿过Transwell小室的细胞数降低,抑癌因子P~(53)、P~(21)表达量上调。由此推测,Z38基因可能为鼻咽癌细胞的癌基因之一。     

抑癌基因ING1在鼻咽癌中的表达及突变分析

本研究运用免疫组化技术、逆转录 - PCR( RT- PCR) ,PCR- SS-CP技术对鼻咽癌组织及鼻咽癌细胞系中 ING1的表达和突变进行检测 .结果发现 3 0例鼻咽癌标本中 ING1蛋白表达下调率为 70 % ( 2 1/ 3 0 ) ;ING1m RNA表达明显下调率为 4 6% ( 12 / 2 6) ,6例鼻咽癌细胞系中有 2例鼻咽癌细胞系表达明显下调 ,而 11例 ( 4 2 .5 % ) NPC组织及其它 4例细胞系表达与正常水平相当 ,另有 3例 ( 11.5 % )鼻咽癌组织过表达 ;单链构像多态性分析 ( SSCP)在鼻咽癌及鼻咽癌细胞系中均未发现突变 .结果表明ING1基因的转录及翻译表达水平与鼻咽癌的发生 /发展呈负相关 ,该基因的异常表达是鼻咽癌发生中的频发事件而与基因突变无关     

鼻咽癌与EB病毒关系的研究

鼻咽癌(nasopharyngeal carcinoma,NPC)是鼻咽上皮来源的恶性肿瘤。它的病因是多方面的，目前仍不是非常清楚，但自从1966年Old等^[1]应用免疫扩散试验首次发现Epstein—Barr病毒(Epstein Barr Virus，EBV)和NPC有血清学关系以来，各国学对此进行了大量研究，在70年代在我国也开展了这方面的工作。现在各国的研究已从NPC病人EBV的血清学检查逐步进入分子生物学的研究。     

miR-221-3p在PTC中的表达及对BCPAP细胞增殖、凋亡的影响与KEGG、GO分析

目的:观察miR-221-3p在乳头状甲状腺癌(PTC)中的表达,分析其与分期、转移的关系,瞬时转染miR-221-3p inhibitor观察其对PTC细胞BCPAP的增殖和凋亡的影响,生物信息学方法分析miR-221-3p可能作用的靶基因、参与的通路及功能.方法:(1)原位杂交法(ISH)检测PTC、滤泡状甲状腺癌(FTC)与正常甲状腺组织中miR-221-3p的表达.(2)miR-221-3p inhibitor瞬时转染BCPAP细胞后与阴性对照组比较,实时荧光定量逆转录聚合酶链反应(qRT-PCR)法、噻唑蓝(MTT)法、Annexin V-FITC/PI流式法分别检测两组细胞miR-221-3p表达、细胞增殖、凋亡情况.(3)软件预测miR-221-3p的靶基因,进行KEGG及GO富集分析.结果:(1)ISH显示PTC组织中miR-221-3p表达明显上调,与FTC、正常甲状腺组织相比差异有统计学意义(P0.01);(2)miR-221-3p inhibitor转染细胞后,细胞miR-221-3p表达下降;细胞增殖减慢,细胞凋亡无明显改变.(3)在PTC中,KEGG分析显示miR-221-3p的靶基因参与了Wnt signaling pathway、Pathways in cancer等通路,GO分析显示miR-221-3p具有细胞代谢调控、基因表达调控、RNA代谢调控等生物功能.结论:miR-221-3p在PTC中表达明显上调,可能成为PTC的一种标志物,可能有影响PTC细胞增殖的作用,参与了Wnt signaling pathway、Pathways in cancer等通路,对PTC细胞的代谢、基因表达等功能具有重要影响.     

长链非编码RNA FGD5-AS1 通过 miR-542-3p/GTPBP4对肝癌细胞放射敏感性的影响

目的:探讨长链非编码RNA FGD5-AS1(lncRNA FGD5-AS1)对肝癌细胞放射敏感性的影响及其分子机制.方法:运用qRT-PCR检测FGD5-AS1、miR-542-3p和GTPBP4在肝癌组织和肝癌细胞系中的表达情况;采用克隆形成实验和流式细胞仪分析FGD5-AS1和GTPBP4表达变化对肝癌细胞系放射...     

miR-9-5p靶向调控ZAK对结直肠癌细胞增殖、迁移和侵袭的影响

目的:阐明miR-9-5p通过靶向调控ZAK表达从而影响结直肠癌细胞增殖、迁移和侵袭能力的分子机制。方法:通过qPCR、Western blot检测结直肠癌细胞系(HCT116、SW260、HT29及LoVo)及结直肠癌患者组织样本中miR-9-5p表达水平及ZAK的mRNA和蛋白表达水平。生物信息学方法分析miR-9-5p与ZAK结合的靶向序列。双荧光素酶基因报告实验检测miR-9-5p对ZAK的靶向调控关系。脂质体法将miR-9-5p mimic或/和ZAK质粒共转染结直肠癌细胞系HCT116及SW620,通过CCK-8及克隆形成实验观察miR-9-5p/ZAK信号轴对细胞增殖的影响，通过Transwell观察对细胞迁移和侵袭能力的影响。结果:与人正常上皮细胞系相比，在结直肠癌细胞系中ZAK的mRNA及蛋白水平显著上调(P<0.05);在结直肠癌临床组织样本中，ZAK蛋白水平亦显著上调(P<0.05);miR-9-5p的表达水平在癌细胞系及组织样本中下调(P<0.05)。双荧光素酶报道基因实验显示miR-9-5p能显著影响ZAK 3’UTR野生型表达载体的荧光素酶...     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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