人类TAP2基因克隆及真核表达质粒的构建

抗原处理相关转运体(transporter associated with antigen processing,TAP)属于ABC(ATP-binding cassette)超家族成员,由TAP1(75 kD)和TAP2(71 kD)形成异二聚体,负责抗原肽从胞浆到内质网的转运,在MHC Ⅰ类分子的抗原处理及提呈过程中发挥重要作用.     

Bacterial and mammalian DNA alkyltransferases sensitize Escherichia coli to the lethal and mutagenic effects of dibromoalkanes

Here we confirm and extend our previous studies demonstrating that the mutagenic potency of 1,2-dibromoethane (DBE) and dibromomethane (DBM) is markedly enhanced (not prevented) in bacteria expressing the O6- alkylguanine-DNA alkyltransferase (ATase) encoded by the Escherichia coli ogt gene. We demonstrate that, in close parallel with mutagenesis, the Ogt ATase sensitizes the bacteria to the lethal effects of these carcinogens, suggesting that one or more of the potentially mutagenic lesions induced by DBE and DBM in the presence of Ogt has additional lethal capacity. We further demonstrate that the sensitization to both lethality and mutagenesis by DBE and DBM is a property shared by other DNA alkyltransferases. This objective was accomplished by quantifying the induction of mutations and lethal events in ogt- ada- E. coli expressing an exogenous bacterial or mammalian ATase from a multicopy plasmid. Mammalian recombinant ATases enhanced the lethal and mutagenic actions of DBE and suppressed the lack of sensitivity of the vector- transformed bacteria to DBM. In most cases the order of effectiveness of the ATases ranked: murine > human > Ogt > rat. Further comparisons included the full-length Ada ATase from E. coli and a truncated Ada version (T-ada) that retains the O6-methylguanine binding domain of the protein. The full-length Ada ATase was effective in enhancing the lethality but not the mutagenicity induced by DBE and DBM. The T-ada ATase provided less sensitization than Ada to lethality by DBE, but of the three bacterial ATases T-ada yielded the highest sensitization to mutagenesis by this compound. T-ada and Ada ATases were in general less effective than the mammalian versions, with the exception of the rat recombinant ATase. The effectiveness of the different mammalian and bacterial ATases in promoting the deleterious actions of dibromoalkanes was compared with the effectiveness of these proteins in suppressing the lethal and mutagenic effects induced by N-nitroso-N-methylurea. The ability to sensitize E. coli to the lethal and mutagenic effects of DBE and DBM seems restricted to DNA alkyltransferase, since overexpression of thioredoxin (Trx) or glutaredoxin (Grx1) in ogt- ada- cells showed no effect, in spite of the reported potential of bioactive dihaloethane- derived species to alkylate Trx.      

Effects of histaminergic neuron on the developmental process of conditioned reward induced by morphine

To investigate the effect of histaminergic neuron on morphine - induced conditioned place preference （ CPP）, the model of CPP was used to assess the rewarding effect of morphine. Morphine （2, 5, 10 mg/kg） significantly produced a CPP in a dose-dependent manner. In addition, morphine simultaneously and markedly lessened the histaminergic neurons in the TM,     

支气管动脉灌注化疗及静脉化疗联合放疗对Ⅲ期非小细胞肺癌疗效的比较

目的 通过对支气管动脉灌注化疗及静脉化疗联合放疗对Ⅲ期非小细胞肺癌的疗效及N分期对其疗效的影响的研究,为临床选择支气管动脉灌注化疗或静脉化疗提供理论依据.方法 70例患者采用单盲随机分为支气管动脉灌注化疗联合放疗组（A组）37例及静脉化疗联合放疗组（B组）33例.结果 A、B组近期有效率分别为78.4%和57.6%,差异无显著性（P=0.06）;1、2、3年生存率分别为64.9%、24.3%、16.2%及51.5%、18.2%、12.1%,差异均无显著性（P＞0.05）.按UICC（国际抗癌联盟）TNM分期中N分期进行分层研究,两组中N0～N1者A组23例,B组17例,近期有效率分别为91.3%及64.7%,差异有显著性（P＜0.05）,1、2、3年生存率分别为78.3%、30.4%、21.7%及58.8%、23.5%、11.7%,差异均无显著性（P＞0.05）.N2～N3者A组14例,B组16例,近期有效率分别为57.1%及50.0%,差异无显著性（P＞0.05）;两组1、2、3年生存率分别为42.9%、14.3%、7.1%及43.8%、12.5%、12.5%,差异均无显著性（P＞0.05）.结论 支气管动脉灌注化疗联合放疗能提高Ⅲ期N0～N1非小细胞肺癌患者的近期疗效,但生存期两者差异无显著性,而对于N2～N3患者无论近期疗效还是生存期差异均无显著性.     

合并厌氧菌感染的治疗

临床上需氧菌与厌氧菌的混合感染并不少见，由于厌氧菌培养较困难，大多数医院都未建立常规培养与药敏测定方法，故常被忽视。如果临床上疏忽了厌氧菌感染，易延误治疗，造成感染扩散，影响预后。     

乌鲁木齐市2000-2004年法定传染病报告质量调查分析

目的为了及时准确地掌握各类传染病的漏报情况，为制订传染病防治策略提供理论依据。方法每年对区、市、系统、乡级医疗机构疫情报告情况进行调查，计算漏报率。结果共调查传染病患者4069例，漏报130例．总平均漏报率为3．19％。年漏报率最低为0．53％；最高为10．39％。漏报病种最高为细菌性痢疾和病毒性肝炎．分别占总漏报数的53．85％和26．15％。结论领导重视、提高业务人员的能力和基层防保队伍的建设，是传染病疫情报告和管理工作顺利开展的保证。     

雷公藤多甙对大鼠胶原免疫性关节炎黏膜免疫的影响

目的:观察雷公藤多甙对于大鼠胶原免疫性关节炎黏膜免疫的影响.方法:Ⅱ型胶原与完全弗氏佐剂免疫大鼠,以雷公藤多甙治疗,观察大鼠黏膜免疫各项指标.结果:雷公藤多甙可以改善CIA大鼠病理改变,降低肠道PP结中CD4/CD8比值,对脾中T细胞亚群有调节作用,并可降低关节中致炎细胞因子的表达.结论:雷公藤多甙对CIA模型大鼠有抗炎和免疫抑制的作用.     

柯达3M969激光相机常见软故障处理与维修思维方法探讨

本文介绍了柯达3M969系列激光相机常见故障处理,也结合目前医疗设备的维修维护现状,探讨了医院设备维修面临的问题和当今数学中的思维方法在维修中的应用.     

异丙酚在人工流产术中的临床效果观察

目的:观察异丙酚在人工流产术中麻醉效果、宫颈松弛程度、阴道出血量、人工流产综合征及术中不良反应。方法:选择对象200例,分观察组、对照组各100例,观察组术前静脉注射异丙酚,对照组术前未给予任何药物,手术方法两组相同。结果:观察组镇痛率为:100％,无人工流产综合征发生;宫颈口松弛程度和术中不良反应,两组有显著性差异(P<0.01);两组术中出血量比较无统计学意义(P>O.05)。结论:异丙酚用于人工流产术镇痛效果较好,可避免人工流产综合征的发生,减少术中不良反应,缩短手术时间,对子宫收缩无影响,可以广泛应用于无痛人工流产术。     

P-gp、p53和VEGF在非小细胞肺癌中的表达及临床意义

目的:探讨P-糖蛋白(P-gp)、p53和血管内皮生长因子(VEGF)在非小细胞肺癌(N SCLC)组织中的表达及临床意义。方法:应用免疫组化检测84例(化疗组40例和非化疗组44例)N SCLC中P-gp、p53和VEGF的表达水平,40例癌旁组织作为对照组,比较三者的表达与生存率的关系。结果:P-gp、p53和VEGF在N SCLC中的阳性表达率分别为40.5%、70.23%和67.9%;P-gp与VEGF呈正相关(χ2=10.805,r=0.360,P=0.001),P-gp与p53无相关性(χ2=138,r=-0.047,P=0.637),p53与VEGF呈正相关(χ2=9.288,r=0.333,P=0.002);化疗组中P-gp、p53和VEGF表达阳性者生存时间明显低于阴性者(P<0.05);Cox显示:临床分期、P-gp、p53和VEGF与N SCLC的预后有关(P<0.05)。结论:P-gp、p53和VEGF检测对肺癌患者化疗效果、预后的判断具有的指导作用。