ErbB-3结合蛋白Ebp1对NIH3T3细胞生长增殖的影响

目的：探讨erbB-3结合蛋白Ebp1对NIH3T3细胞生长增殖的影响。方法：将真核表达质粒pEGFP—C1和Ebpl基因经双酶切后用T4连接酶连接，并经鉴定序列正确后，用脂质体转染剂Lipofectin Reagent稳定转染NIH3T3细胞，免疫细胞化学显色，在激光共聚焦扫描显微镜下观察Ebp1蛋白的表达和定位；通过平板集落形成率观察细胞生长增殖能力的改变。结果：重组质粒鉴定正确，成功构建Ebp1稳定表达的NIH3T3细胞系，并存显微镜下可见绿色荧光，免疫细胞化学显色可见Ebp1蛋白表达；转染目的基因的细胞克隆形成率明显升高。结论：成功构建Ebp1稳定表达细胞系，Ebp1融合蛋白表达于胞质，呈不均匀颗粒状、环状分布；Ebp1在体外能增强NIH3T3细胞生长增殖。     

小鼠肿瘤/睾丸抗原Biot2对NIH3T3细胞增殖的影响

目的:研究新发现的小鼠肿瘤/睾丸抗原Biot2对小鼠NIH3T3细胞生物学行为的影响,探讨基因的生物学功能。方法:构建真核表达质粒pcDNA3.1( )-Biot2,由脂质体包裹稳定转染NIH3T3细胞,用Realtime RT-PCR、Western blot等方法筛选和鉴定Biot2表达阳性细胞克隆,研究其与细胞增殖相关的生物学特征的变化。结果:成功构建真核表达重组质粒pcDNA3.1( )-Biot2,并稳定转染于NIH3T3细胞。与对照组相比,转染了Biot2cDNA的NIH3T3细胞生长速率明显增快。结论:成功地建立稳定转染小鼠新基因Biot2的NIH3T3细胞克隆;Biot2基因能影响细胞增殖的调节,促进NIH3T3细胞的增殖,为进一步研究基因生物学功能奠定了基础。     

表达载体pEGFP-C3-PENK的构建以及在NIH3T3细胞中的表达

目的:构建质粒pEGFP-C3-PENK,并观察其在真核细胞中表达的时效.方法:构建质粒pEGFP-C3-PENK;低浓度裸质粒、高浓度裸质粒、脂质体介导分别转染NIH3T3细胞,观察转染率、绿色荧光蛋白表达情况;放射免疫法和免疫细胞化学法检测脑啡肽的表达情况.结果:质粒pEGFP-C3-PENK成功构建;低浓度裸质粒转染率5%;高浓度裸质粒转染率8%,脂质体介导转染率为20%;转染5周后仍有绿色荧光蛋白表达.结论:成功构建质粒pEGFP-C3-PENK,可在NIH3T3细胞中表达超过5周.     

膜联蛋白A5绿色荧光蛋白重组质粒的构建及其在宫颈癌细胞系Hela细胞中的表达

目的：构建在哺乳动物细胞中表达的膜联蛋白A5(anxA5)的重组质粒,并在真核细胞中表达。方法：用PCR方法从pJLA503-anxA5质粒中扩增anx A5的基因序列,引入酶切位点XhoⅠ和Bam HⅠ。将真核表达质粒pEGFP-N1和anxA5的PCR产物经双酶切后用T4连接酶连接,并经鉴定序列正确后,用磷酸钙共沉淀法稳定转染Hela细胞,荧光显微镜下观察;免疫细胞化学染色观察anxA5在Hela细胞的表达。结果：重组质粒鉴定正确,稳定转染Hela细胞,在荧光显微镜下可见绿色荧光,免疫细胞化学染色可见anxA5表达。结论：成功构建了pEGFP-anxA5重组质粒,并能在宫颈癌细胞系Hela细胞中表达,为研究anxA5的功能及其在细胞系中的作用奠定了基础。     

Smad7过度表达抑制3T3细胞增殖和TGF-β1基因表达

研究Smad7过度表达对TGF β1基因表达的调控和对 3T3细胞增殖的影响。实验将Smad7质粒 ,通过脂质体介导转染NIH3T3细胞 ,应用RT PCR方法鉴定转染结果和检测TGF β1mRNA的表达 ,以及用免疫细胞化学检测TGF β1蛋白的表达情况 ,并观察基因转染对细胞增殖的影响。结果显示转染Smad7后 ,NIH3T3细胞中TGF β1mRNA的表达显著减少 (P <0 0 5 ) ,TGF β1蛋白的表达下降 ,细胞增殖明显减缓 (P <0 0 5 )。提示Smad7过度表达能够抑制 3T3细胞的增殖和TGF β1基因的表达 ,可以通过阻断TGF β细胞内信号传导来调控TGF β1的生物学行为。     

携带钙整合素结合蛋白基因逆转录病毒表达载体的构建及包装细胞系的建立

目的:构建钙整合素结合蛋白(CIB)的逆转录病毒表达载体,并建立包装细胞系.方法:质粒pet32-CIB经EcoR I和Xho I双酶切后亚克隆至逆转录病毒载体pLXSN,构建重组逆转录病毒表达载体pLXSN-CIB,PCR及双酶切鉴定后,通过脂质体转染导入包装细胞pA317,G418稳定筛选后获得抗性克隆,NIH3T3细胞进行逆转录病毒颗粒谪度测定.结果:重组逆转录病毒表达载体pLXSN-CIB质粒测序结果与GenBank中序列一致,经PCR及酶切鉴定证实,获得了大约574 bp的基因片段,且正确插入pLXSN-CIB载体中；建立了pA317-CIB包装细胞系,采用NIH3T3细胞测定病毒滴度为6.81 ×105 CFU/mL.结论:pLXSN-CIB结构正确,成功构建了CIB基因的逆转录病毒表达载体并建立了pLXSN-CIB包装细胞系.     

核内M-CSF对NIH3T3细胞内微丝的影响

目的建立M-CSF核内稳定表达的NIH3T3细胞系,探讨核内M-CSF对细胞骨架的影响。方法经脂质体介导核内定位表达重组体pCMV/M-CSF转染NIH3T3细胞,G418筛选后,用Rt-PCR、免疫细胞化学鉴定其在真核细胞中的表达及定位分布,用考马斯亮蓝染色细胞微丝测定M-CSF进入细胞核后对细胞骨架的影响。结果RT-PCR结果显示转染pCMV/M-CSF的NIH3T3细胞能稳定表达M-CSFmRNA;免疫细胞化学结果显示表达的M-CSF定位于NIH3T3细胞核。考马斯亮蓝染色结果显示转染pCMV/M-CSF的NIH3T3细胞内微丝数量减少,排列紊乱。结论核内M-CSF可引起NIH3T3细胞内微丝数量减少,排列紊乱。     

NIH3T3细胞核内过表达的M-CSF对细胞运动的影响

目的构建M-CSF细胞核内定位表达载体pCMV/M-CSF,探讨核内M-CSF对NIH3T3细胞运动的影响。方法采用PCR的方法扩增人M-CSF活性片段,将其插入核内真核表达载体pCMV/myc/nuc,构建重组体pCMV/M-CSF,经脂质体介导转染NIH3T3细胞,G418筛选后,用免疫细胞化学及Western blot鉴定其在真核细胞中的表达及定位分布,用细胞划痕实验测定M-CSF进入细胞核后对细胞运动能力的影响。结果限制性双酶切及DNA测序分析结果显示插入pCMV/M-CSF的片段为1400bp左右,与预期M-CSF分子大小相当。Western blot结果显示转染pCMV/M-CSF的NIH3T3细胞能稳定表达M-CSF蛋白;免疫细胞化学结果显示表达的M-CSF定位于NIH3T3细胞核。细胞划痕实验显示转染pCMV/M-CSF的NIH3T3细胞有较强的运动能力。结论成功构建M-CSF核内定位表达载体pCMV/M-CSF,核内M-CSF可加强NIH3T3细胞运动。     

STGC3基因突变载体的构建及其在CNE2细胞中的表达

目的 :构建STGC3基因单碱基位点突变载体并观察CNE2细胞中STGC3蛋白表达情况,为探讨STGC3基因发挥抑瘤作用的功能性位点提供前期基础。方法 :针对STGC3基因糖基化、蛋白激酶C磷酸化、酪蛋白激酶Ⅱ磷酸化3个(656C、725C、913T)可能性功能位点,运用Stratagene定点突变技术,对STGC3基因656C、725C、913T位点分别进行单碱基定点突变,使656C突变为G,725C突变为T,913T突变为G,构建突变表达质粒,同时构建野生型质粒为对照。质粒经转化、抽提、酶切及测序鉴定。将重组真核表达质粒,用脂质体转染至鼻咽癌CNE2细胞系,经G418筛选,得到稳定表达STGC3基因3种突变型CNE2细胞系。实验设6组,即空白对照组(Negative control)、空载体组(Vector)、野生型组(His-STGC3)和3个STGC3基因突变型组(His-STGC3-C656G、His-STGC3-C725T、His-STGC3-T913G)。运用RT-PCR、免疫印迹及免疫细胞化学,观察重组质粒突变型STGC3基因是否正常表达。结果 :突变质粒经酶切和测序鉴定,酶切结果显示目的片段大小一致,测序结果显示突变序列正确,成功构建带His标签的3个突变型(His-STGC3-C656G、His-STGC3-C725T、His-STGC3-T913G)重组真核表达质粒。RT-PCR、免疫印迹和免疫细胞化学结果显示,突变质粒均正常表达His-tag-STGC3基因及融合蛋白质,融合蛋白定位于细胞质和细胞核。结论 :成功构建STGC3基因单碱基位点突变质粒,并在CNE2细胞中表达STGC3融合蛋白。     

肝细胞生长因子基因转染对人脐静脉内皮细胞增殖、迁移的影响

目的:观察HGF基因对人脐静脉内皮细胞增殖、迁移的影响。方法:从已有质粒pRc/CMV-HGF中扩增出HGF基因,将其克隆到含增强型绿色荧光蛋白的真核表达载体中,构建重组质粒pEGFP-HGF,酶切及测序鉴定正确后,用脂质体将重组质粒pEGFP-HGF转染到人脐静脉细胞株ECV304中,G418筛选获得稳定表达细胞克隆,采用荧光显微镜观察、RT-PCR、免疫细胞化学方法检测鉴定重组质粒的表达情况;酶联免疫吸附法(ELISA)检测稳定表达细胞中HGF的含量;再以MTT法检测转染重组质粒后细胞增殖的改变,Transwell Migration实验检测细胞迁移能力的改变。结果:所构建重组质粒经酶切图谱分析和序列测定证实构建成功;荧光显微镜下观察到有绿色荧光;RT-PCR证实HGFmRNA在转染阳性细胞高表达;免疫细胞化学证实转染pEGFP-HGF质粒的细胞有HGF蛋白的表达;ELISA检测细胞培养基中HGF含量可达112.3 ng/ml,MTT法、TranswellMigration测定转染pEGFP-HGF阳性细胞的增殖、迁移能力明显高于对照组(P<0.01)。结论:重组质粒pEGFP-HGF能够在内皮细胞株ECV304转录、表达;表达的活性蛋白HGF刺激ECV304的增殖、迁移,为进一步应用于基因治疗奠定实验基础。     

Electrochemical copolymerization of 3-dodecylthiophene and 3-methylthiophene

3-Dodecylthiophene ( 1a ) and 3-methylthiophene ( 1b ) were copolymerized electrochemically. The visible and IR spectra of the neutral copolymers prove the copolymers to be of random structure, which can be denoted as that of poly(3-alkyl-2,5-thienylene)s. 1b polymerizes with preference over 1a . With increasing fraction of monomeric units of 1b in the copolymers, the conductivity increases and the solubility of the neutral copolymers decreases. The copolymer containing 58 mol-% monomeric units of 1b has a high conductivity of 220 S/cm and a good solubility of 75 wt.-% in chloroform. ¹H NMR spectra of poly(3-dodecylthienylene) and copolymers show two chemical shifts for the α(1)-methylene protons of the monomeric units of 1a as well as of the methyl protons of the monomeric units of 1b . This fact may be explained by the presence of head-to-head and other constitutions.     

14-3-3蛋白的研究进展

14-3-3是一个在真核生物中广泛表达的酸性蛋白家族,主要以同源/异源二聚体形式存在,通过磷酸化丝/苏氨酸作用与靶蛋白或靶蛋白的2个结构域结合。7种不同亚型的高度保守的14-3-3蛋白与人类细胞中多种不同的信号通路有密切的关系。14-3-3通过调节靶蛋白间的相互作用在信号转导途径中发挥调控作用。     

3-Hydroxy-3-methylglutaric aciduria

3-Hydroxy-3-methylglutaric aciduria was found in a newborn infant whose parents are first cousins. The patient presented at 5 days of life with hyperammonemia, hypoglycemia, and metabolic acidosis. There was no ketonuria. Diagnosis was made by analysis of the pattern of organic acids excreted in the urine. A profound deficiency in activity of 3-hydroxy-3-methylglutaryl-coenzyme A lyase was found in cultured skin fibroblasts. The parents had intermediate levels of enzyme activity.     

3-Hydroxy-3-Methylglutaric Aciduria

3-Hydroxy-3-methylglutaric aciduria was found in a newborn infant whose parents are first cousins. The patient presented at 5 days of life with hyperammonemia, hypoglecemia, and metabolic acidosis. There was no ketonuria. Diagnosis was made by analysis of the pattern of organic acids excreted in the urine. A profound deficiency in activity of 3-hydroxy-3-methylglutaryl-coenzyme A lyase was found in cultured skin fibroblasts. The parents had intermediate levels of enzyme activity.     

14－3－3蛋白的新认识

14-3-3蛋白是一个在真核生物中广泛表达的高度保守的酸性蛋白家族,主要以同源/异源二聚体形式存在,在哺乳动物中由7种亚型组成。7种不同亚型的14-3-3蛋白在人类细胞中发挥着重要作用。本文就14-3-3蛋白的序列保守性和独特性、结构特征、结合靶点、调控机制以及作为潜在药物治疗靶点的相关研究进展做一综述。     

Regulation of Abortion by γλ T Cells

PROBLEM: T cells are present at the feto-maternal interface, but their function during pregnancy has not been fully elucidated. T cells bearing γλ T-cell receptor (TCR) may be particularly important, as some subsets can react to trophoblast cells by producing cytokines, such as interleukin-2 (IL-2). METHOD: We depleted T cells bearing the γλ receptor by injecting monoclonal antibodies (mAB) into females of the abortion-prone animal model CBA x DBA/2. We investigated the percentage and number of γλ T-cell receptor positive (TCR)⁺ cells in decidua and spleen during pregnancy in control and γλ-depleted female mice. Pregnant females were also exposed to ultrasonic sound stress to boost the abortion rate. RESULTS: Stress failed to increase the abortion rate in the γλ TCR-depleted mice. FACScan analysis show that the ratio of cells bearing the γλ TCR dramatically decreased after injection of mAB to the γλ TCR in spleen and decidua, these cells recovered six days after depletion, showing a change in cytokine pattern. Levels of TNF-α in decidual γλ T cells decreased; similar effects of decreasing Th₁ cytokines could be observed in splenic γλ T cells. We further identified increased levels of intracellular TNF-α in the Vλ4 subset in the decidua, compared to spleen. CONCLUSIONS: Trophoblast recognition by the Vλ4 T-cell subset in the decidua may cause the release of abortogenic cytokines such as TNF-α. Depletion of such γλ TCR T cells during early pregnancy may promote successful pregnancy outcome in normal pregnancy and prevent stress-induced abortions.