HHV-8 ORF73C基因的克隆及其在大肠杆菌中的表达

利用PCR技术获得人疱疹病毒8型（HHV-8）ORF73C基因，克隆至pGEMT—easy载体，进-步克隆至原核表达载体pGEX-6P-1中，构建含HHV-8 ORF73C基因的重组表达质粒pGEXORF73；重组表达质粒pGEXORF73在大肠杆菌中得到有效表达。     

三种人类8型疱疹病毒特异性抗原表达及复合抗原血清学检测方法的建立

目的建立人类8型疱疹病毒（HHV-8）血清学检测方法。方法利用E．coli系统合成HHV-8三个抗原性较强的融合蛋白：K8．1，ORF65和ORF73C，作为检测抗原，阳性血清为本地12份卡波西肉瘤患者血清和32份AIDS相关型卡波西肉瘤患者血清；阴性血清为20份皮肤肿瘤患者血清和77份15岁以下儿童血清。以Western印迹及EI．ISA法确定各重组蛋白免疫原性和该混合抗原ELISA法的敏感度和特异度。结果获得高纯度的3种8型疱疹病毒特异重组蛋白，均具备较强的抗原特性。应用上述复合抗原ELISA法与传统免疫荧光法共同筛查同批次阳性和阴性血清，发现前者敏感度远高于后者，分别为81．8％和34．4％，特异度则为97．9％。结论K8．1、ORF65、ORF73C是建立HHV-8血清学检测方法较佳的候选抗原，有更高的敏感度和特异度。     

犬圆环病毒ORF3基因的克隆及表达载体的构建

目的克隆犬圆环病毒(Canine circovirus,CanineCV)ORF3基因,制备ORF3的抗体,为研究ORF3的功能奠定基础。方法以CanineCV基因组为模板,PCR扩增编码框ORF3全长序列。将ORF3基因克隆至原核表达载体pET-28a,构建重组原核表达质粒pET(28a)-ORF3。重组质粒转化入感受态细胞BL21(DE3),用IPTG诱导表达重组蛋白ORF3,并进行SDS-PAGE和Western blot鉴定。结果 PCR扩增出CanineCV编码框ORF3片段长度为318bp。构建的重组质粒pET(28a)-ORF3转化DE3后经IPTG诱导5h,表达分子质量单位(Mr)约为15×103蛋白,与预期相符。Western blot显示重组蛋白能被Anti-His标签抗体识别。结论成功构建了pET(28a)-ORF3重组原核表达质粒,并能在大肠杆菌中表达具有免疫反应性的ORF3,为抗ORF3抗体的制备奠定了基础。     

细粒棘球蚴重组14-3-3基因的表达、纯化及免疫学鉴定

目的 构建细粒棘球蚴14-3—3基因的重组质粒并原核表达、纯化该重组蛋白，对其免疫学特性进行初步鉴定。方法 从重组质粒pGEM—T／Eg14-3—3中获取14—3—3基因，亚克隆于表达载体pET28a构建基因丁程菌株，并表达、纯化重组蛋白，经Westernblot、ELISA对该蛋白的免疫学特性进行初步研究。结果 成功构建含目的片段14—33的基因工程菌株；ELISA检测显示，用表达、纯化的重组蛋白免疫小鼠，诱导产生了特异性抗体，Westernblot鉴定该抗体能识别重组抗原及原头蚴、囊液、囊壁抗原。结论构建的pET28a／Eg14—3—3菌株能高效表达14—3—3蛋白，初步鉴定该重组蛋白具有较好的抗原性和免疫原性。     

细粒棘球绦虫AgB8／1-AgB8／2重组嵌合抗原表达系统的构建

目的构建pET32a—AgBS／1-AgBS／2原核表达载体,并对其重组蛋自进行原核细胞表达。方法从细粒棘球绦虫原头蚴中提取总RNA,反转录生成cDNA,以此cDNA为模板,用基因特异性引物分别扩增EgAgBS／1和EgAgBS／2基因编码其分泌型多肽的片段,经测序后,以此两条基因片段为依据,人2r-合成EgAgBS／1-EgAgBS／2嵌合抗原编码核酸序列,将其克隆至pUCm—T载体,测序鉴定其正确性。通过对pUCm—T／AgBS／1-AgBS／2重组质粒进行双酶切,将获得的AgB8／1-AgBS／Z嵌合抗原编码核酸序列用定向克隆技术克隆至原核表达质粒pET32a上,测序鉴定插入片段E-确后,转化至E.coli BL21（DE3）Lys S,IPTG初步诱导表达pET32a-AgBS／1-AgBS／2重组嵌合蛋白。用SDS—PAGE电泳分析鉴定重组蛋白的表达水平。结果测序表明,AgBS／1-AgBS／2嵌合抗原编码核酸序列正方向插入至pET32a质粒。SDS-PAGE电泳分析显示,IPTG诱导后重组嵌合蛋白得到成功表达,在相对分子量约38kD处有表达条带。结论成功构建了pET32a—AgBS／1-AgBS／2原核表达质粒,并初步诱导表达出AgBS／1-AgBS／2嵌合重组蛋白,为进一步研究其免疫学特性奠定了基础。     

结核分枝杆菌Rv2352c基因的克隆表达及其抗原活性鉴定

目的构建含结核分枝杆菌(M.tb)rv2352c基因原核表达载体,经转化E.coli以表达Rv2352c融合蛋白,并研究其抗原性。方法用PCR扩增M.tb rv2352c基因,克隆入pET30a(+)质粒,构建pET30a(+):rv2352c重组质粒,阳性克隆测序验证正确后转化入表达宿主大肠杆菌BL21(DE3),经IPTG诱导Rv2352c蛋白表达。经Ni+-NTA层析柱纯化融合蛋白,通过SDS-PAGE和结核患者血清Western blot进行鉴定。将纯化的重组蛋白分别免疫家兔,制备抗Rv2352c抗血清,抗血清的效价测定采用酶联免疫吸附试验法(ELISA),取兔抗血清与纯化蛋白Rv2352c通过Western blot方法,检测抗体特异性。结果经酶切鉴定和测序分析证实rv2352c原核表达质粒构建正确,SDS-PAGE和Western blot结果显示,在45 kD处呈现单一蛋白条带。用重组蛋白Rv2352c免疫接种后可诱导出高滴度的特异性抗体。纯化蛋白通过Western blot鉴定证实为目的蛋白,有较强的免疫原性。结论成功构建原核表达重组质粒pET30a(+):rv2352c,制备和纯化的Rv2352c融合蛋白具有较好的纯度和生物学功能,为进一步研究结核病的潜在分子标志物奠定基础。     

GFP-Rv2626c融合蛋白表达载体的构建及表达纯化

目的构建含Rv2626c基因的原核表达载体,获得GFP-Rv2626c融合蛋白,为今后开发鉴别结核感染的血清学诊断试剂打下基础。方法以结核杆菌H37Rv基因组DNA为模板,经PCR法扩增得到Rv2626c基因DNA片段。将扩增片段克隆到pGM-T载体中测序,并进一步将Rv2626c亚克隆到pET28a-GFP中,构建原核重组表达载体pET28a-GFP-Rv2626c。将pET28a-GFP-Rv2626c转化E.coli BL21(DE3),用IPTG诱导目的基因表达,经SDS-PAGE和Western-blot分析和纯化该表达产物。结果经核苷酸序列测定和酶切鉴定,成功构建了重组质粒pET28a-GFP-Rv2626c。用IPTG诱导该质粒转化的E.coliBL21后,获得分子量约46kD的GFP-Rv2626c融合蛋白。经Ni-NTA Agarose试剂盒进行蛋白纯化,获得纯化的GFP-Rv2626c融合蛋白。结论成功制备出重组GFP-Rv2626c融合蛋白,为开发鉴别结核感染的血清学诊断试剂打下了基础。     

绵羊ARQ基因型PrP前体蛋白基因的克隆及原核表达

目的构建ARQ基因型PrP前体蛋白基因原核表达重组质粒,为TSE的检测及诊断、PrP的结构与功能研究奠定基础。方法根据GenBank中绵羊PrP基因全序列和表达载体pET28a载体的多克隆位点设计了绵羊PrP前体蛋白基因引物,以绵羊基因组DNA为模板,PCR扩增绵羊PrP前体蛋白基因,通过酶切将些基因克隆到pET28a(+)载体中,构建了重组原核表达质粒pET-OPrP。重组质粒转化E.coliBL-21感受态细胞,用IPTG诱导表达,通过PAGE电泳和Western-blo-ting鉴定表达的重组蛋白。结果在pET28a(+)载体中成功克隆了PrP前体蛋白基因,并在E.coli中成功表达了重组的PrP前体蛋白。结论绵羊PrP前体蛋白基因可以在E.coli中表达。本次克隆得到的小尾寒羊的PrP基因型为ARQ。     

日本血吸虫重组质粒pET28α-Sj32的构建及其在大肠埃希菌BL21(DE3)中的表达

目的构建日本血吸虫重组质粒pET28α-Sj32,研究该质粒在大肠埃希菌BL21(DE3)中的表达。方法超声粉碎日本血吸虫成虫,提取总RNA,通过RT-PCR扩增Sj32抗原编码基因;将该基因克隆至原核表达载体pET28α,构建重组质粒pET28α-Sj32并转化大肠埃希菌BL21(DE3),经异丙基硫代-β-D-半乳糖苷(IPTG)诱导表达后用SDS-PAGE和Western blot对表达产物进行分析和鉴定。结果RT-PCR扩增出1270bp的Sj32基因;双酶切和PCR鉴定证实Sj32基因成功插入pET28α中,SDS-PAGE分析显示表达产物为分子质量单位约为42ku的重组蛋白,与预期结果一致,表达的蛋白约占菌体总蛋白的24%;Western blot鉴定重组蛋白能被日本血吸虫感染的兔血清识别。结论成功构建了日本血吸虫重组质粒pET28α-Sj32,该质粒在大肠埃希菌BL21中获得了高效融合表达,表达的融合蛋白具有抗原特异性。     

3种截短的泡球蚴Eml8基因原核表达质粒的构建、表达及鉴定

目的 构建3种截短的泡球蚴18（Eml8）基因的原核表达质粒，获得高效表达、有生物活性的3种重组蛋白，并对其进行初步鉴定。方法 DNAman软件设计引物，PCR法扩增并构建3种截短的pET41a-Eml8．1、Eml8．2和Eml8．3原核表达质粒，测序鉴定插入序列正确性；IPTG诱导、表达和纯化rEml8．1-GST、rEml8．2-GST和rEml8．3一GST重组蛋白，SDS-PAGE电泳及Westernblot进行初步鉴定。结果 成功构建了3种截短的pET41a—Eml8．1、Eml8．2和Eml8．3重组表达质粒；SDS-PAGE检测表明rEml8．1-GST、rEinl8．2-GST、rEml8．3-GST重组蛋白得到成功表达，在分子质量单位为41、45．5和45．5ku处有表达条带；Westernblot显示3种重组蛋白均能被AE病人血清识别。结论 成功构建了截短的pET41a-Eml8．1、pET41a-Eml8．2和pET41a—Eml8．3原核表达质粒，表达的3种重组蛋白均具有良好的抗原性，为Eml8抗原表位分析奠定了基础。     

Medical and Psychology Students' Knowledge and Attitudes Regarding Aging and Sexuality

The current study surveys medical and doctoral psychology students (N = 100) from an urban northeastern university regarding knowledge and attitudes toward elderly sexuality and aging using the Facts on Aging Quiz, the Aging Sexuality Knowledge and Attitudes Scale, and measures of interest in gerontology, academic/clinical exposure to aging and sexuality, and contact with elders. The current study found that psychology students demonstrated greater aging knowledge than medical students; however, both groups showed gaps in knowledge about sexuality. Married students had greater academic/clinical exposure and greater knowledge about aging but less permissive attitudes toward elderly sexuality. Generally, knowledge about aging was the strongest correlate of knowledge about sexuality. Level of knowledge about sexuality was not associated with attitudes. Attitudes toward sexuality and aging may be more strongly tied to demographic variables reflective of religious beliefs or adherence to sociocultural norms.     

Leptin and cellular and innate immunity in abstinent alcoholics and controls

BACKGROUND: Basic studies indicate that in vitro and in vivo doses of leptin modulate cellular immune responses. Given evidence that concentrations of leptin are altered in alcoholics who also show immune abnormalities, this study examined the relationships between circulating levels of leptin and markers of cellular and innate immunity. METHODS: Circulating levels of leptin, natural killer cell (NK) activity, interleukin-2 (IL-2)-stimulated NK activity, and concanavalin A-stimulated production of IL-2, IL-6, IL-10, and IL-12 were compared between abstinent DSM-IV alcohol-dependent men (n = 27) and age- and gender-matched controls (n = 34). RESULTS: As compared with controls, alcoholics showed lower NK activity (p < 0.01) and a trend for lower levels of leptin (p = 0.055). In the total sample, leptin predicted NK activity (beta = 0.33; p < 0.05) after controlling for the confounding influence of body mass index, alcohol intake, and smoking. Leptin was not correlated with any of the cytokine measures. To examine whether the effects of leptin were mediated by its direct action on NK, additional studies examined in vitro effects of leptin on NK activity in healthy volunteers (n = 10); leptin doses (0.1, 1, and 10 nM) yielded levels of NK activity comparable to those with media alone. CONCLUSIONS: These data show that circulating levels of leptin are associated with NK activity in humans and suggest that abnormal in vivo concentrations of leptin may contribute to the declines of NK activity in alcoholics who are at risk for infectious diseases.     

自身免疫与动脉粥样硬化的发生发展

在动脉粥样硬化的发生发展过程中,自身免疫具有重要作用,本文就近年有关动脉粥样硬化的免疫机制的研究进展作一简要综述.     

慢性饮酒、吸烟与骨质疏松的相关性研究

目的 探讨长期大量慢性饮酒、吸烟等不良生活方式与骨质疏松的关系.方法 以乏力、腰背痛、双下肢酸困为主诉,且有长期大量慢性饮酒史、吸烟史,无其他慢性疾病史的年轻男性患者45例为观察对象,测定其血钙(Ca)、血磷(P)和血肌酐(Cr)、尿素氮(BUN)、血糖(Glu)、天门冬酸氨基转移酶(AST)、丙氨酸基转移酶(ALT)、血清碱性磷酸酶(ALP)、甲状腺功能、全段甲状旁腺激素(iPTH)、1,25-二羟维生素D3[1,25-(OH) 2D3]、双能X线骨密度仪测定腰椎L1-4及左侧股骨近段(包括颈、股骨颈上部、大粗隆)骨密度(BMD),分析饮酒、吸烟对骨量的影响.以感冒发热就诊、年龄相当、无饮酒、吸烟史及慢性疾病史的45例男性为对照组.结果 观察组1,25(OH)2D3水平均降低,血钙水平偏低,血磷正常,碱性磷酸酶呈不同程度地升高,骨密度T值提示观察组27例骨质疏松,12例骨量减少,6例正常骨量;而对照组仅有6例为骨量减少,1例骨质疏松,38例为正常骨量,两组比较差异有统计学意义(P＜0.05).结论 长期慢性大量饮酒吸烟影响骨量,甚至易导致骨质疏松.     

中青年超重和肥胖与高血压及高同型半胱氨酸血症的相关性研究

目的探讨中青年超重和肥胖与高血压及高同型半胱氨酸血症的相关性。方法选取2012年1月—2013年10月在我院进行常规健康体检者750例,测量受试者血压、身高、体质量及血清同型半胱氨酸(Hcy)水平。结果男性超重、肥胖检出率分别为36.87%(198/537)和13.97%(75/537),均高于女性的16.43%(35/213)和7.50%(16/213)(P0.05)。超重者和肥胖者高血压和高同型半胱氨酸血症检出率分别为21.03%(49/233)和11.16%(26/233)、46.12%(42/91)和41.76%(38/91),均高于正常者的9.16%(37/404)和2.23%(9/404),肥胖者高于超重者(P0.01)。收缩压(SBP)、舒张压(DBP)及血清Hcy与BMI呈正相关(r值分别为0.639、0.515、0.497,P0.01)。结论中青年尤其是男性超半数存在超重或肥胖,高血压及高同型半胱氨酸血症与BMI呈正相关,超重和肥胖者高血压及高同型半胱氨酸血症的发生率高,应积极防治。     

Cement and Concrete Nanoscience and Nanotechnology

Concrete science is a multidisciplinary area of research where nanotechnology potentially offers the opportunity to enhance the understanding of concrete behavior, to engineer its properties and to lower production and ecological cost of construction materials. Recent work at the National Research Council Canada in the area of concrete materials research has shown the potential of improving concrete properties by modifying the structure of cement hydrates, addition of nanoparticles and nanotubes and controlling the delivery of admixtures. This article will focus on a review of these innovative achievements.