恒河猴类麻疹综合症的病原检测

对暴发类麻疹综合症的恒河猴病料组织进行了电镜观察,发现有副粘病毒粒子,然后分别合成了麻疹病毒及犬瘟热病毒的特异性引物,对病料进行RT-PCR扩增,从发病死亡的恒河猴脏器中扩增到犬瘟热病毒核蛋白基因287bp的特异片断,而麻疹病毒的检测为阴性.扩增到的犬瘟热病毒核酸片段经序列测定并与GenBank中的犬瘟热病毒毒株进行了比较,发现死亡恒河猴脏器中扩增到的片段序列与犬瘟热病毒疫苗株Onderstepoort、标准野毒株A75-17基因序列的同源性较高,研究结果表明引起恒河猴发病的病原体为麻疹病毒属的犬瘟热病毒.     

猴空泡病毒(SV40)PCR检测方法的建立与初步应用

目的建立检测实验猴及生物制品中猴空泡病毒(SV40)的PCR方法。方法根据SV40-776株设计合成三对引物对现有毒株进行PCR扩增并克隆测序。用这三对引物对56份猴肾、肺、脾及10批脊髓灰质炎疫苗进行检测。结果三对引物均扩增出目的片段;56份猴脏器和10批疫苗SV40检测均为阴性。结论56只恒河猴和10批疫苗中未检测到SV40,所设计的三对引物检测结果准确,均可用于检测。     

我国猕猴群中B病毒分离鉴定和检测方法研究初报

本实验从野外捕获的恒河猴的口腔溃疡灶中分离到一株病毒。该病毒在Vero细胞上具有B病毒特征性细胞病变 ,电镜观察具有疱疹病毒的典型形态与结构。经PCR扩增、SacⅡ酶切、PCR产物测序并与美国分离的BVE2 4 90株的部分基因序列进行比较 ,初步证实该分离株为B病毒 ,并命名为BV1 4 7株。用BV1 4 7株制备抗原片 ,并与国产HSV 1抗原片同时进行猴血清中B病毒抗体检测 ,可明显提高阳性检出率。B病毒的分离成功 ,对于提高我国实验猕猴的质量和检测水平 ,建立无B病毒猴群 ,增加出口创汇均具有十分重要的意义。     

猪流行性腹泻病毒变异株的分离鉴定及其S基因序列分析

为分析山东省2016年上半年猪流行性腹泻病毒(PEDV)流行株变异情况,用Vero细胞从仔猪临床腹泻样品中进行病毒分离,通过细胞病变(CPE)观察、聚合酶链式反应(PCR)方法、免疫荧光(IFA)试验、电镜观察、动物回归试验和测序分析,分离鉴定1株PEDV毒株(SDMY1401株).将该毒株进行S基因序列分析和遗传进化分析,结果表明该毒株为PEDV流行变异株.该毒株S基因核苷酸序列与山东省分离株CH-SDZC-2015和河南省分离株CHHNAY-2015同源性最高为99.4%,与疫苗毒株CV777同源性为94%.遗传进化分析表明该毒株与经典毒株DR13、疫苗毒株CV777及以前国内分离毒株在不同分支.     

蓝舌病病毒内蒙古分离株VP2基因5''端序列分析及探针制备

从内蒙古巴盟地区分离的蓝舌病病毒株(BTV-NM)提取总RNA,经反转录PCR扩增VP2基因5′端片段,并构建至pGEM-T载体中.序列测定后,将这一序列与蓝舌病毒澳大利亚株VP2基因5′端进行比较分析:同源性为40%.通过PCR法标记克隆的cDNA片段,制备地高辛标记探针,与粗提的蓝舌病发病羊病毒RNA进行Northern blot杂交,并作敏感性试验,结果表明此探针对蓝舌病毒内蒙古分离株具有特异性,可检测出50 pg的病毒RNA.     

蓝舌病病毒内蒙古分离株VP_2基因5′端序列分析及探针制备

从内蒙古巴盟地区分离的蓝舌病病毒株(BTV-NM)提取总RNA,经反转录PCR扩增VP2基因5′端片段,并构建至pGEM-T载体中.序列测定后,将这一序列与蓝舌病毒澳大利亚株VP2基因5′端进行比较分析:同源性为40%.通过PCR法标记克隆的cDNA片段,制备地高辛标记探针,与粗提的蓝舌病发病羊病毒RNA进行Northernblot杂交,并作敏感性试验,结果表明此探针对蓝舌病毒内蒙古分离株具有特异性,可检测出50pg的病毒RNA.     

B病毒PCR检测方法的建立

目的建立B病毒核酸的PCR检测方法。方法设计引物,用PCR方法扩增B病毒,并验证其灵敏性和特异性。结果引物P1、P2及P3、P4在以B病毒为模板时有特定大小的目的片段出现,在以其他病毒为模板时无目的片段出现;引物P5、P6以B病毒和人单纯疱疹病毒I型(HSVI)为模板能扩增出382bp的产物,经SacⅡ酶切后,B病毒产生176bp和206bp的两个片段,HSVI无变化。结论通过PCR方法成功的区分开B病毒,并且鉴定区分了B病毒和HSVI。     

自繁幼猴感染B病毒的情况调查

目的调查昆明亚灵生物科技有限公司室外猴场食蟹猴和恒河猴群B病毒（猴疱疹病毒Ⅰ型）的抗体情况,以了解B病毒在母猴和幼猴之间的传播.方法对繁殖年龄的雌性和雄性猴血清B病毒抗体进行检测,按照血清抗体B病毒阳性和阴性分开饲养,建立繁殖群.对出生1岁以上的幼猴进行血清病毒抗体检测.结果 检测的137份B病毒阴性群自繁幼猴血清中,没有B病毒抗体呈阳性,阳性率为0％;检测的426份B病毒阳性群自繁幼猴血清中,有27份B病毒抗体呈阳性,阳性率为6.3％.     

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%。     

蓝舌病病毒内蒙古分离株VP2基因5′端序列分析及探针制备

从内蒙古巴盟地区分离的蓝舌病病毒株(BTV—NM)提取总RNA，经反转录PCR扩增VP2基因5′端片段，并构建至pGEM—T载体中。序列测定后，将这一序列与蓝舌病毒澳大利亚株VP2基因5′端进行比较分析：同源性为40％。通过PCR法标记克隆的cDNA片段，制备地高辛标记探针，与粗提的蓝舌病发病羊病毒RNA进行Northernblot杂交，并作敏感性试验，结果表明此探针对蓝舌病毒内蒙古分离株具有特异性，可检测出50pg的病毒RNA。     

Ⅰ型单纯疱疹病毒包膜糖蛋白L基因片段的克隆及高效表达

 采用PCR方法扩增HSV-1病毒型特异性包膜糖蛋白L(gL)基因片段并克隆至原核表达载体pGEX-5X-1获得重组质粒pGEX-5X-1-gL,将重组质粒转化E.coli BL21表达菌后经IPTG诱导表达目的蛋白.SDS-PAGE蛋白检测表明,在分子质量56 ku处有HSV-1 GST-gL融合蛋白的高效表达,通过IPTG浓度筛选和诱导前表达菌扩增培养时间的比较分析对诱导条件进行了优化,GST-gL融合蛋白表达量可达到菌体蛋白总量的48.65%.Western blot中利用HSV-1灭活病毒获得的多克隆抗体确证所表达蛋白为HSV-1病毒组分.这一表达系统的建立和优化对进一步探讨HSV-1 gL蛋白功能及其免疫原性提供了有利条件.     

牛疱疹病毒Ⅰ型(BHV-1)荧光定量PCR检测方法的建立及应用

目的 建立牛疱疹病毒Ⅰ型(BHV-1)实时荧光定量PCR检测方法,用于牛源性样本中BHV-1的快速检测。方法 根据已发表的BHV-1 gB基因设计特异引物和TaqMan探针,建立BHV-1实时荧光定量PCR方法。并对方法的特异性、敏感性、重复性稳定性等进行测定。用建立的方法对181份牛源性样本进行检测。结果 建立的BHV-1荧光定量PCR检测方法与牛副流感病毒Ⅲ型(BPIV3)、牛病毒性腹泻病毒1型(BVDV1)、猪伪狂犬病毒(PRV)、单纯疱疹病毒Ⅰ型(HSV-1)、猫疱疹病毒1型(FHV-1)均无交叉反应;检测灵敏度可达到1×101copies/μL;批内变异系数均小于5%。应用建立的方法检测181份牛源性样本,有6份样本BHV-1核酸为阳性。结论 建立的BHV-1荧光定量PCR检测方法具有快速、特异、敏感及稳定的特点,可用于牛源性样本中BHV-1污染的检测。     

An immunologically active chimaeric protein containing herpes simplex virus type 1 glycoprotein D

Herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) cause both persistent and latent infections, including recurrent cutaneous disease, lethal neonatal disease, central nervous system disease and other clinical syndromes. Modified live vaccines or conventionally prepared subunit vaccines have generally been unsuccessful in the treatment of HSV-1 and HSV-2 infections from the standpoints of safety and efficacy. It has been established that HSV-1 and HSV-2 infectivity may be neutralized in vitro with antisera directed specifically against each of the four major glycoproteins of the virus (gA/gB, gC, gD and gE) and antisera against glycoprotein gD, of either HSV-1 or HSV-2, are capable of neutralizing both HSV-1 and HSV-2 infectivity in vitro and in vivo. We have previously reported on the identification, DNA sequence and expression at low level in Escherichia coli of the gD gene of HSV-1 strain Patton. Here we describe construction of a hybrid gene encoding a chimaeric protein containing HSV-1 gD, bacteriophage lambda Cro and E. coli beta-galactosidase (gD-beta-gal) protein, which is expressed at high level in E. coli. Moreover, the chimaeric protein elicits antibodies in rabbits that not only immunoprecipitate gD from cells infected with HSV-1 and HSV-2 but also neutralize HSV-1 and HSV-2 infectivity in vitro.     

Antiviral activities of extracts from Hong Kong seaweeds

We extracted six Hong Kong brown seaweed species with hot water for their antiviral properties. The cytotoxicity and antiviral activity of these extracts were tested by MTT [3-（4,5-dimethylthiazol-2-yl）-2,5-diphenlytetrezolium bromide] method, cytopathic effect reduction assay, and plaque reduction assay. The antiviral effect was further determined by flow cytometric analysis. The results showed that most of these extracts inhibited the propagation of herpes simplex virus types 1 and 2 （HSV-1 and HSV-2） standard strains with very low cytotoxicity to the host cells. The extracts ofHydroclathrus clathratus and Lobophora variegata showed more potential anti-HSV activities than the extracts of the other four seaweeds. They also had moderate antirespiratory syncytial virus （RSV） activities but could not inhibit influenza A virus. Hydroclathrus clathratus was further extracted by diluted acid and alkali and the antiviral effects of the extracts were also detected. The result showed that the hot water extract contained the main carbohydrate components that exhibited the antiviral activities against various strains of HSV, including the acyclovir-resistant strain. HI-3, a compound fractionated from this hot water extract, showed a dose-dependent anti-HSV activity in flow cytometric analysis and plaque reduction assay.     

小鼠巨细胞病毒荧光定量PCR检测方法的建立及应用

目的 建立小鼠巨细胞病毒(Mouse Cytomegalovirus,MCMV)荧光定量PCR方法并对其进行初步应用。方法 选取NCBI发表的MCMV Smith株DNA polymerase基因保守序列设计引物探针,建立MCMV的荧光定量PCR方法,对方法的特异性、敏感性、重复性及稳定性进行验证,并应用该方法检测掺入MCMV的小鼠血液样品及2018年度送检的409份小鼠血液样本。结果 建立的MCMV荧光定量PCR方法标准曲线Slope为-3. 418,R2值为0. 999,扩增效率为96. 137%,可定量检测到的MCMV最低含量为47 copies/μL。以大鼠巨细胞病毒,猴巨细胞病毒,人单纯疱疹病毒,伪狂犬病毒及猫疱疹病毒I型为模板均无扩增曲线,特异性良好。方法组内和组间变异系数分别为0. 39%～0. 68%和0. 48%～1. 01%,重复性和稳定性好。可检测到掺入小鼠血液样品中MCMV病毒的最大稀释度为1∶1000(100. 75 TCID50/0. 1 m L),409份小鼠血液样品经检测均为阴性。结论 建立的小鼠巨细胞病毒荧光定量PCR方法有很好的敏感性、特异性及稳定性,可有效地检测小鼠中MCMV,为实验小鼠MCMV的监测及相关标准的补充完善提供了技术参考。     

猫细小病毒 PCR 检测方法的建立及初步应用

摘要: 目的 建立猫细小病毒 PCR 检测方法,应用于猫临床样本中 FPV 的快速检测。方法 根据已发表的 FPV VP2 基因序列设计合成引物,并以此建立 FPV 的 PCR 检测方法,并对方法的特异性、敏感性、稳定性等进行验证。 用建立的方法对 33 份猫临床样品进行检测。结果 建立的 FPV PCR 检测方法与猫疱疹病毒Ⅰ型(FHV-1)、猫冠 状病毒(FeCV)、猫合胞体病毒(FeSFV)、猫免疫缺陷病毒(FIV)均无交叉反应;可检测病毒最小滴度为 5lgTCID50 / mL,相应的 DNA 模板浓度为 4. 9 × 102 拷贝/μL;FPV DNA 在 － 30℃冰箱放置 12 个月仍可检测出目的条带。应用 该方法从 33 份猫临床样本中检测出 21 份 FPV 核酸阳性。结论 建立的 FPV PCR 检测方法具有特异、敏感及稳定 的特点,适合于临床 FPV 的感染检测。     

Glycoprotein C of herpes simplex virus 1 acts as a receptor for the C3b complement component on infected cells

Receptors for the Fc portion of immunoglobulins or for the third component of complement (C3) are present on a variety of circulating and fixed tissue cells including granulocytes, monocytes, lymphocytes and glomerular epithelial cells. Cells which lack Fc receptors may express them after infection by herpes simplex virus (HSV)-1, HSV-2, cytomegalovirus or varicella zoster virus. We recently reported that infection by HSV-1 induces both Fc and C3 receptors on human endothelial cells. Glycoprotein E of HSV-1 has been shown to function as an Fc receptor. We now demonstrate that glycoprotein C (gC) of HSV-1 functions as a C3b receptor. This receptor appears following HSV-1, but not HSV-2, infection. Detection of the C3b receptor is blocked by monoclonal antibodies to glycoprotein C (gC) of HSV-1, but not by monoclonal antibodies to other HSV-1 glycoproteins. In addition, the MP mutant of HSV-1, which lacks gC, fails to express a C3b receptor. These results assign a new function of gC of HSV-1 and demonstrate potentially important differences between HSV-1 and HSV-2 glycoproteins.     

Genetic retrieval of viral genome sequences from herpes simplex virus transformed cells

Oncogenic transformation of cultured cells by inactivated herpes simplex virus (HSV) types 1 and 2 has been demonstrated. Expression of HSV information in these transformed cells has been shown by immunofluorescence studies, detection of HSV neutralizing antibody in sera from tumour-bearing animals and by hybridization of HSV-specific RNA. Molecular hybridization studies of DNA from HSV-2 transformed hamster cells have detected up to 40% of the HSV genome present in several copies. Complementation of three HSV-2 temperature-sensitive mutants when superinfecting the RE1 rat embryo cell line (transformed by the HSV-2 temperature-sensitive mutant ts1) suggests that resident viral genes can be expressed. Brown et al. used a similar approach to detect HSV information latent in human ganglia. We report here retrieval of intertypic HSV recombinants from HSV transformed cells after superinfection with ts mutants of the alternative serotype of HSV. Restriction enzyme analysis which clearly differentiates between HSV-1 and HSV-2 DNA has demonstrated the isolation of recombinants spanning the genome and of virus indistinguishable from the original transforming virus.