人乙肝病毒DNA在感染树鼩肝细胞内状态的研究

为探讨人乙肝病毒ＤＮＡ在树Ｑｕ肝细胞内存在状态，对经血清学证明已被感染的树Ｑｕ肝组织进行转移印迹杂交分析。结果，在实验感染早期的树Ｑｕ肝细胞检出ＨＢＶ ＤＮＡ复制的中间体；在实验中晚期的动物肝细胞发现整合型的ＨＢＶ ＤＮＡ。表明树Ｑｕ肝对ＨＨＢＶ敏感，可成为乙肝和肝细胞癌发病机理研究及治疗乙肝药物筛选的较好的实验动物模型。     

人乙肝病毒DNA在感染树鼠句肝细胞内状态的研究

为探讨人乙肝病毒（ＨＨＢＶ）ＤＮＡ在树鼠句肝细胞内存在状态，对经血清学证明已被感染的树鼠句肝组织进行转移印迹杂交分析。结果，在实验感染早期的树鼠句肝细胞检出ＨＢＶＤＮＡ复制的中间体；在实验中晚期的动物肝细胞发现整合型的ＨＢＶＤＮＡ。表明树鼠句肝对ＨＨＢＶ敏感，可成为乙肝和肝细胞癌发病机理研究及治疗乙肝药物筛选的较好的实验动物模型。     

乙肝病毒前S1抗原与HBeAg及HBV-DNA之间的相关分析

目的：探讨乙型肝炎病毒前S1抗原与HbeAg及HBV-DNA的关系．分析前S1抗原在临床诊断乙型肝炎病毒复制中的作用．方法：采用ELISA法检测前S1抗原,化学发光法检测乙肝五项指标,PCR法检测HBV-DNA．结果：400例HBV—DNA阳性的乙肝患者中,HbeAg阳性率为86．0％,前S1抗原阳性率为75．5％．其中：前S1抗原阳性率在HbeAg阳性患者中为75．6％、在抗-HBe阳性患者中为75．0％．HBV-DNA阳性情况下,Hbe鲰阳性与HbeAg阴性患者的前S1抗原阳性率,两组经χ^2检验,P〉0．05,无统计学差异．结论：前S1抗原是诊断乙肝病毒复制的有价值的一项血清学指标．     

HIV的病原学研究进展

人类免疫缺陷病毒(Human Immunodeficiency Virus,简称HIV)是导致艾滋病的病原体。研究HIV的病原学是认识HIV的致病机理、寻找有效的抗病毒治疗的靶位、设计HIV疫苗和诊断方法并最终控制艾滋病的基础。自从1983年HIV被分离出以来,HIV的病原学研究取得了长足进展：阐明了HIV的形态、结构以及病毒各个组成部分的功能;了解了HIV的复制和生命周期,并对病毒复制的调控有了基本的认识;对HIV在体内的动态和变异规律有了深入的了解;在上述认识的基础上,对HIV的致病机理以及病毒与宿主细胞的相互作用进行了深入的研究并取得了良好的进展。但是,艾滋病的抗病毒治疗和特异性免疫预防还远没有解决。开展深入的艾滋病病原学和致病机理研究,进一步揭示病毒复制、调控和致病的分子机制,阐明病毒与宿主细胞的相互作用,是发展新型抗药物、设计有效的HIV疫苗的前提和保证。本文概括了HIV病原学研究领域的主要进展,并提出了今后研究的展望。     

广西仙湖实验动物养殖场猕猴病毒感染的监控

本文报道广西仙湖实验动物养殖场三代猕猴病毒感染八年来的监控结果，猴Ｂ病毒、巨细胞病毒由亲代１００％的感染率到子一代和子二代变为阴性。猴痘病毒、麻疹病毒、爱滋病毒、反转录Ｄ型病毒、Ｔ淋巴细胞趋向病毒Ｉ型、Ｖ型、甲、乙肝病毒感染保持阴性。对养殖管理系统的工作作了探讨。     

利用质谱技术鉴定寨卡病毒非结构蛋白NS1的细胞内相互作用蛋白

寨卡病毒(Zika Virus)属于黄病毒科中的黄病毒属,虽然很早就已经被人类所发现,但是一直到2015年在南美巴西的大规模爆发,才引起了广泛的关注.寨卡病毒对人类的感染往往引起包括小头畸形和格林-巴利综合征在内的多种症状.寨卡病毒的基因组为单链正链RNA,其基因组可以编码翻译并剪切加工出3个结构蛋白,分别为膜蛋白,囊膜蛋白和核衣壳蛋白,以及7个非结构蛋白(NS1, NS2A, NS2B, NS3, NS4A, NS4B, NS5).相关研究已经证明,NS1蛋白与同属黄病毒属的登革病毒的发病有紧密的联系,而且根据其蛋白结构推测其可能与寨卡病毒穿越血脑屏障有关.因此鉴别NS1与细胞内的相互作用蛋白对于发现寨卡病毒在细胞内的转运,转录,以及装配都有重大的意义.在此,该课题构建并在HEK293细胞中表达包含Flag和Strep两种标签的NS1融合蛋白,通过免疫沉淀的方法将与NS1结合的蛋白利用标签蛋白进行分离,利用高分辨生物质谱技术,对蛋白进行分析鉴定.通过分别带有Flag与Strep标签的相互作用蛋白分析,发现了16个两种标签共同的结合蛋白,其进一步的通路分析证明这些蛋白于与病毒转录、病毒复制和免疫反应多个通路有关,相关的研究结果为今后进一步研究寨卡病毒的复制机制以及开发抗病毒药物提供了重要的参考价值.     

猴B病毒BVgD-多肽ELISA检测方法的建立

目的建立猴B病毒抗体BVgD-多肽ELISA检测方法。方法以Western-blot分析猴B病毒糖蛋白D(BVgD)上的多肽抗原决定簇(BVgD-多肽)的抗原性,采用方阵滴定法,确定ELISA法的最佳实验条件。用灭活BV全病毒、HSV-1和BVgD-多肽三种抗原系统对猴血清样品进行平行检测,比较分析了三种系统的抗原性特点。并且将检测结果与美国BV抗体检测试剂盒的检测结果进行了比较。结果建立了猴B病毒抗体的BVgD-多肽ELISA法,研究结果表明本方法与BV全病毒和以HSV-1病毒为抗原的试剂盒相比,敏感性较低、特异性较好,避免了制备BV抗原对实验室要求高和HSV-1抗原引起的非特异性问题。检测结果与美国实验室BV抗体检测结果的符合率达85%。     

Infectious foot-and-mouth disease virus derived from a cloned full-length cDNA of OH／CHA／99

The China foot-and-mouth virus (FMDV) isolate OH/CHA/99 was isolated from swine, which was unable to infect bovine thyroid cells in vitro or to cause typical disease in bovines following intradermal inoculation in the tongue. To enhance antigenicity, replication, maturation and pathogenicity studies of OH/CHA/99, an infectious fulllength cDNA clone, designated pBIFMDV, was prepared. The in vitro and in vivo biological properties of the virus derived from pBIFMDV were studied by analyzing antigenicity, plaque morphology and virulence in pigs. The results showed that the virus derived from pBIFMDV had the same biological properties as the parent strain OH/CHA/99; the fulllength infections cDNA clone, pBIFMDV, will be very useful in studies of the antigenicity, virulence, pathogenesis, maturation and replication of FMDV.     

高校图书馆应如何对乙肝学生患者进行心理护理与健康教育

笔者与本馆研究组成员通过对本校2007级768名乙肝病毒学生患者进行问卷调查,并对造成他们心理负担的结果进行分析,最后总结出了对乙肝病毒学生患者如何进行心理护理和健康教育,目的是发挥高校图书馆教育优势,让学生能正确地认识乙肝疾病,增强自我保护意识,使学生能健康成长。     

Infective viruses produced from full-length complementary DNA of swine vesicular disease viruses HK/70 strain

Swine vesicular disease (SVD) is a highly conta- gious viral disease of pigs. Symptoms are clinically indistinguishable from those caused by other vesiculardisease viruses, such as foot and mouth disease (FMD virus, vesicular stomatitis (VS) virus and ves…     

校园网络防病毒体系的研究

校园网络安全正经受着严峻挑战,网络病毒,特别是来自校园内网的网络病毒时刻威胁着校园网络各种应用业务系统的正常运转和网上信息资源的安全,基于网络传播感染的病毒层出不穷,病毒的防范和控制已经成为校园网管理工作的重要组成部分.文章结合西北民族大学校园网实际情况,介绍如何构建和部署一套安全有效的校园网防病毒体系,以及通过日常管理工作流程不断完善此防毒体系.     

中国大陆乙型肝炎病毒基因分型的研究进展

目的:综述乙型肝炎病毒的分子基因型在中国境内的地理分布的特点、临床特征和治疗疗效的关系。方法:收集并综述近五年中国大陆的研究成果。结果:虽然HBV有8个基因型,但中国大陆只有4个基因型别流行,其分布表现出明显的地域性。结论:中国大陆HBV基因型与HBV自然史、致病性、预防、治疗等关系的研究为今后控制乙型肝炎提出了方向。     

Epstein-Barr virus infection and replication in a human epithelial cell system.

Epstein-Barr virus, a human herpesvirus with oncogenic potential, infects two target tissues in vivo: B lymphocytes, where the infection is largely non-productive, and stratified squamous epithelium in which virus replication occurs. The interaction with B cells, initiated through virus binding to the B-cell surface molecule CR2 (ref. 4), has been studied in vitro and the virus 'latent' genes associated with B-cell growth transformation defined. By comparison, viral infection of epithelium remains poorly understood, reflecting the lack of an appropriate cell-culture model. Here we describe the development of such a model using as targets CR2-expressing transfected cells of two independent human epithelial lines. A high proportion of these cells bind virus and become actively infected, expressing the small EBER RNAs (small non-polyadenylated virus-coded RNAs) and the Epstein-Barr nuclear antigen 1 but not other latent proteins; thereafter, under conditions favouring epithelial differentiation, up to 30% of the cells can be induced to enter virus productive cycle with some progressing to full virus replication. We find significant differences between laboratory virus strains in their ability to infect epithelium that do not correlate with their B-cell growth-transforming activity.     

基于诱骗的中心控制病毒防卫模型研究

互联网的迅速扩大,网络成为病毒传播的主要手段,网络病毒随之产生。与传统的基于主机的病毒相比,网络病毒有更强的繁殖能力,传播能力和破坏能力。防范网络病毒成为当前研究的重点,产生了许多不同的病毒传染模型和网络病毒检测方法。文中分析了病毒传播机制后,提出一种新颖的网络病毒的检测方法———基于诱骗的中心控制病毒防卫模型。在该模型中利用监测器检测网络是否发生异常,利用诱骗技术来捕获病毒的样本并把该样本提交给管理中心进行处理,并研制出相应的疫苗发放给组织内的所有主机,达到防护的目的。最后给出了一旦检测器发生错误判断后病毒在该检测模型中的传染模型。     

Crystal structure of the anti-viral APOBEC3G catalytic domain and functional implications

The APOBEC family members are involved in diverse biological functions. APOBEC3G restricts the replication of human immunodeficiency virus (HIV), hepatitis B virus and retroelements by cytidine deamination on single-stranded DNA or by RNA binding. Here we report the high-resolution crystal structure of the carboxy-terminal deaminase domain of APOBEC3G (APOBEC3G-CD2) purified from Escherichia coli. The APOBEC3G-CD2 structure has a five-stranded beta-sheet core that is common to all known deaminase structures and closely resembles the structure of another APOBEC protein, APOBEC2 (ref. 5). A comparison of APOBEC3G-CD2 with other deaminase structures shows a structural conservation of the active-site loops that are directly involved in substrate binding. In the X-ray structure, these APOBEC3G active-site loops form a continuous 'substrate groove' around the active centre. The orientation of this putative substrate groove differs markedly (by 90 degrees) from the groove predicted by the NMR structure. We have introduced mutations around the groove, and have identified residues involved in substrate specificity, single-stranded DNA binding and deaminase activity. These results provide a basis for understanding the underlying mechanisms of substrate specificity for the APOBEC family.     

中药复方板蓝根颗粒抗柯萨奇B_4病毒作用的实验研究

采用中药复方板蓝根颗粒进行了体外抗柯萨奇病毒B4(CVB4)的研究,通过观察病毒引起的细胞病变效应(CPE)、MTT法检测细胞活性,作为考核药物抗病毒作用.结果表明:中药复方板蓝根颗粒对CVB4无直接灭活作用,但能抑制CVB4在Hep-2细胞内的的生物合成和阻止CVB4的吸附,其半数抑制浓度(IC50)分别为1129.00和1130.44μg/mL,治疗指数(TI)均为2.78.在100～1600μg/mL范围内复方板蓝根颗粒与CVB4抑制率呈明显的量效关系(P<0.01),在1600μg/mL时能抑制CVB4在Hep-2细胞内的增殖>50%.研究表明中药复方板蓝根颗粒能有效地抑制CVB4在Hep-2细胞中的增殖,其抗病毒作用发生在阻断病毒吸附细胞和抑制病毒进入细胞之后的复制增殖.     

The APOBEC-2 crystal structure and functional implications for the deaminase AID

APOBEC-2 (APO2) belongs to the family of apolipoprotein B messenger RNA-editing enzyme catalytic (APOBEC) polypeptides, which deaminates mRNA and single-stranded DNA. Different APOBEC members use the same deamination activity to achieve diverse human biological functions. Deamination by an APOBEC protein called activation-induced cytidine deaminase (AID) is critical for generating high-affinity antibodies, and deamination by APOBEC-3 proteins can inhibit retrotransposons and the replication of retroviruses such as human immunodeficiency virus and hepatitis B virus. Here we report the crystal structure of APO2. APO2 forms a rod-shaped tetramer that differs markedly from the square-shaped tetramer of the free nucleotide cytidine deaminase, with which APOBEC proteins share considerable sequence homology. In APO2, two long alpha-helices of a monomer structure prevent the formation of a square-shaped tetramer and facilitate formation of the rod-shaped tetramer via head-to-head interactions of two APO2 dimers. Extensive sequence homology among APOBEC family members allows us to test APO2 structure-based predictions using AID. We show that AID deamination activity is impaired by mutations predicted to interfere with oligomerization and substrate access. The structure suggests how mutations in patients with hyper-IgM-2 syndrome inactivate AID, resulting in defective antibody maturation.     

利用TMV病毒载体在烟草中瞬时表达rPA（Reteplase）

构建了携带有人组织型纤溶酶原激活剂突变体rPA（Reteplase）的烟草花叶病毒（Tobacco Mosaic Virus,TMV）瞬时表达载体PJL TRBO-rPA,并转入农杆菌GV3101中.利用农杆菌渗滤接种技术在烟草本氏烟（Nicotiana benthamiana）中进行表达.经SDS-聚丙烯酰胺凝胶电泳（SDS-PAGE）、免疫印迹（western blotting）和纤维蛋白琼脂糖平板（fibrin-agarose plate assay,FAPA）法检测分析.结果表明,在烟草中成功地表达出了有活性的rPA.为在植物中生产Reteplase提供了一条可能的途径.