共查询到19条相似文献，搜索用时 250 毫秒
1.
为研究II型草鱼呼肠孤病毒(grass carp reovirus, GCRV)病毒样颗粒(viruses-like particles, VLPs)疫苗,本试验利用杆状病毒-昆虫细胞表达系统(baculovirus expression vector system, BEVS)将编码VP35蛋白的GCRV-S11基因克隆入杆状病毒载体pFastBacHTATM,然后将鉴定正确的重组质粒转化至DH10Bac感受态细胞,筛选得到重组穿梭质粒Bacmid-VP35。将穿梭质粒Bacmid-VP35以及实验室前期构建的重组穿梭质粒Bacmid-VP3、Bacmid-VP4分别转染sf9昆虫细胞获得重组杆状病毒pFHB-VP35、pFHB-VP3以及pFHB-VP4。利用Bac-PAK快速滴定试剂盒测定重组杆状病毒滴度,并通过间接免疫荧光(IFA)和Western Blot鉴定重组蛋白的表达情况。结果显示,本试验获得了较高滴度的重组杆状病毒,并且重组蛋白在杆状病毒感染的sf9昆虫细胞中正确表达。将成功表达的重组杆状病毒pFHB-VP35、pFHB-VP3以及pFHB-VP4共感染sf9细胞组装GCRV-VLPs,通过透射电镜(EM)进行检测。结果显示,GCRV的3个蛋白在sf9昆虫细胞中可以完成自我组装,形成与天然病毒结构形似的VLPs,直径大小为65-72nm。本试验结果为进一步研制安全、高效的GCRV-VLPs疫苗奠定基础。 相似文献
2.
为研制基于杆状病毒表达系统的大鲵虹彩病毒(Chinese giant salamander iridovirus,CGSIV)新型亚单位疫苗,将CGSIV主要衣壳蛋白(major capsid protein,MCP)基因克隆至杆状病毒穿梭载体p Fast Bac1质粒中,构建了重组质粒p Fast Bac-MCP。转化E.coli DH10Bac感受态细胞,经PCR筛选和测序获得了阳性重组杆粒r Bacmid-MCP,在昆虫细胞转染试剂介导下将该重组杆粒转染Sf9细胞,获得重组杆状病毒。重组杆状病毒感染的Sf9昆虫细胞,经超薄切片电镜观察,可见大量重组杆状病毒存在于细胞中。按不同感染复数(MOI=2、5、10)将重组杆状病毒感染Sf9细胞进行CGSIV MCP的表达。SDS-PAGE检测结果表明,在MOI=10时,目的蛋白的表达量最高;间接免疫荧光观察结果显示,目的蛋白在感染细胞中得到表达,且分布在细胞表面。以抗CGSIV MCP单抗为抗体制备的免疫磁珠纯化目的蛋白并利用兔抗CGSIV MCP多抗血清检测目的蛋白的生物学活性。SDS-PAGE和Western blot结果显示,纯化的目的蛋白纯度很高,而且具有抗原活性,能够被兔抗大鲵虹彩病毒MCP多抗血清识别。利用杆状病毒表达系统成功进行了CGSIV MCP的表达,并应用免疫磁珠法进行了目的蛋白的纯化,为CGSIV新型亚单位疫苗的研制奠定了基础。 相似文献
3.
根据CCVORF6基因序列,设计合适的引物,扩增ORF6基因,分别将其克隆到自杀性DNA疫苗载体pS-FV与常规DNA疫苗载体pcDNA3.1(+)中,转化感受态细胞DH5α后提取质粒,构建斑点叉尾鮰(Ictalurus punc-tatus)自杀性DNA疫苗ps-ORF6与常规DNA疫苗pcd-ORF6,利用转化后的大肠杆菌菌液为模板进行PCR扩增、提取质粒酶切鉴定以及序列测定等方法证实重组质粒构建正确。将重组质粒转染人胚肾细胞(293T),间接免疫荧光试验表明ORF6均获得表达,但自杀性DNA疫苗的表达效果不如常规DNA疫苗,该研究为这2种疫苗进一步的鱼体试验奠定了基础。 相似文献
4.
根据CCVORF6基因序列,设计合适的引物,扩增ORF6基因,分别将其克隆到"自杀性"DNA疫苗载体pS-FV与常规DNA疫苗载体pcDNA3.1(+)中,转化感受态细胞DH5α后提取质粒,构建斑点叉尾鮰(Ictalurus punc-tatus)"自杀性"DNA疫苗ps-ORF6与常规DNA疫苗pcd-ORF6,利用转化后的大肠杆菌菌液为模板进行PCR扩增、提取质粒酶切鉴定以及序列测定等方法证实重组质粒构建正确。将重组质粒转染人胚肾细胞(293T),间接免疫荧光试验表明ORF6均获得表达,但"自杀性"DNA疫苗的表达效果不如常规DNA疫苗,该研究为这2种疫苗进一步的鱼体试验奠定了基础。 相似文献
5.
鱼类病毒性神经坏死病毒衣壳蛋白在昆虫细胞中的表达及其特性 总被引：1，自引：0，他引：1
利用RT-PCR技术获得病毒性神经坏死病毒0603株的衣壳蛋白基因,将其插入到杆状病毒Bac-To-Bac表达系统的pFastBacI质粒中,构建了pFastBac-cp质粒.转化DH10Bac大肠杆菌后获得重组穿梭载体Bacmid-cp,脂质体介导将其转染Sf9细胞产生有感染性的重组杆状病毒AcNPV-cp.利用AcNPV-cp感染Sf9细胞后,SDS-PAGE分析可见大小约为37 ku的特异性蛋白带,Western-blotting分析发现,其可以与病毒性神经坏死病毒阳性血清反应出现特异性的杂交带.试验结果表明,AcNPV-cp在Sf9细胞中成功地表达了病毒性神经坏死病毒的衣壳蛋白,其具有良好的免疫学活性.负染电镜观察发现,CP蛋白可自行装配成病毒样颗粒,其大小形态类似于病毒性神经坏死病毒.制备超薄切片后电镜观察发现,CP蛋白自行装配成的病毒样颗粒呈晶格状排列在细胞质中.为研制有效防控鱼类病毒性神经坏死病的新型颗粒性疫苗奠定了基础. 相似文献
6.
鱼类神经坏死病病毒衣壳蛋白在昆虫细胞中的表达及其特性 总被引：1，自引：0，他引：1
鱼类病毒性神经坏死病毒能引起多种海水鱼类中枢神经组织病变,给各国海水养殖业造成了巨大的损失。本研究利用RT-PCR技术获得病毒性神经坏死病毒0603株的衣壳蛋白基因,将其插入到杆状病毒Bac-To-Bac表达系统的pFastBacⅠ质粒中,构建了pFastBac-cp质粒。转化DH10Bac大肠杆菌后获得重组穿梭载体Bacmid-cp,脂质体介导将其转染Sf9细胞产生有感染性的重组杆状病毒AcNPV-cp。利用AcNPV-cp感染Sf9细胞后,SDS-PAGE分析可见大小约为37kD的特异性蛋白带, Western-blotting分析发现,其可以与病毒性神经坏死病毒阳性血清反应出现特异性的杂交带,试验结果表明AcNPV-cp在Sf9细胞中成功地表达了病毒性神经坏死病毒的衣壳蛋白,其具有良好的免疫学活性。负染电镜观察发现,CP蛋白可自行装配成病毒样颗粒,其大小形态类似于病毒性神经坏死病毒。制备超薄切片后电镜观察发现,CP蛋白自行装配成的病毒样颗粒呈晶格状排列在细胞质中。
本研究为研制有效防控鱼类病毒性神经坏死病的新型颗粒性疫苗奠定了基础。 相似文献
7.
近年来,鳜弹状病毒引起的病害频发,该病毒传播快,致病性强,是引起鳜病害的主要病原之一。鳜弹状病毒基因组编码5个结构蛋白,其中糖蛋白G是病毒表面的主要抗原,为实现该抗原蛋白的大量表达,利用分子克隆技术将鳜弹状病毒糖蛋白G片段插入杆状病毒穿梭载体pFastBac1中转化至大肠杆菌DH5α感受态细胞后,筛选阳性克隆获得重组转移载体pFastBac-G,再将其转化至大肠杆菌DH10Bac感受态细胞,经蓝白斑与抗性筛选后获取重组杆粒rBacmid-G,随后利用脂质体转染法将重组杆粒转染Sf9昆虫细胞制备重组杆状病毒。将获取到的P3代重组病毒感染Sf9昆虫细胞进行重组蛋白的SDS-PAGE检测,成功表达后利用镍离子亲和层析柱纯化目的蛋白,随后对重组蛋白进行Western blot鉴定,结果显示在大于50 ku处有一条特异性条带,而对照组无条带,表明制备的抗原能与抗体特异性结合。结果表明,鳜弹状病毒糖蛋白G在杆状病毒表达系统成功表达。本试验结果可为鳜弹状病毒糖蛋白G疫苗的研发和大规模生产提供技术支撑。 相似文献
9.
根据已克隆的半滑舌鳎(Cynoglossus semilaevis)生长激素(GH)基因和生长激素受体Ⅰ(GHR-Ⅰ)基因的cDNA序列信息设计引物,用于扩增半滑舌鳎GH、GHR-Ⅰ基因序列。随后,分别利用表达载体pET-32a和pGEX-6P-1成功构建了包含半滑舌鳎GH、GHR-Ⅰ基因ORF全序列及不同ORF片段的6个重组质粒,并将获得的重组质粒在表达宿主菌大肠杆菌(Escherichia coli)BL21(DE3)中,用IPTG诱导表达。SDS-PAGE电泳结果显示:重组GH的pET-32a-CSGH质粒在40 kD处有特异性的蛋白条带,重组GHR-Ⅰ胞内区的pGEX-6P-1-CSGHR1-2质粒在70 kD处发现诱导的蛋白条带,其表达量分别占细胞蛋白总量的37.6%和20.2%;而构建的pGEX-6P-1-CSGH重组质粒和含有GHR-Ⅰ基因跨膜区的重组质粒(pET-32a-CSGHR1-1、pET-32a-CSGHR1-2和pGEX-6P-1-CSGHR1-1)均未获得表达产物。由此可见,半滑舌鳎GHR-Ⅰ基因的跨膜区可能影响其在大肠杆菌中的表达。研究结果为实现半滑舌鳎GH、GHR-Ⅰ制剂的开发及应用于养殖生产实践奠定基础。 相似文献
10.
鲤疱疹病毒Ⅱ型(CyHV-2)能够引起鲫大量死亡,严重威胁我国水产养殖业的健康发展,目前,针对CyHV-2尚无有效的商业化疫苗或治疗措施。为构建CyHV-2DNA疫苗,本研究将其衣壳蛋白ORF66编码基因克隆至pVAX1真核表达载体上,构建重组质粒pVAX-ORF66。此外,在BL21(DE3)pLysS中对ORF66蛋白进行了原核表达,表达蛋白经纯化后免疫新西兰白兔制备了ORF66特异性抗体。酶联免疫吸附(ELISA)检测显示,制备抗体效价达1∶20000以上。将pVAX-ORF66质粒转染金鱼脑细胞系(GFB),利用制备的ORF66抗体进行间接免疫荧光(IFA)检测,结果显示,ORF66蛋白可以在细胞中大量表达,且主要定位于细胞质中。将pVAX-ORF66质粒肌肉注射鲫后进行CyHV-2免疫保护实验,结果表明,其相对免疫保护率达55.6%。本研究针对CyHV-2构建了一种制备简单、成本低廉的DNA疫苗,为鲫造血器官坏死病的免疫预防及感染分子机制研究奠定了前期实验基础。 相似文献
11.
Recombinant channel catfish virus (Ictalurid herpesvirus 1) can express foreign genes and induce antibody production against the gene product 总被引：1，自引：0，他引：1
The potential use of channel catfish virus (CCV) (Ictalurid herpesvirus 1) as a vaccine vector for the channel catfish industry was investigated by inserting the Escherichia coli lacZ gene into the CCV genome and evaluating the immune response to the foreign gene product in catfish exposed to the recombinant. The recombinant virus was produced by inserting the lacZ in reading frame with the ATG start codon of the CCV thymidine kinase (TK) gene in the recombinant transfer plasmid pBSCV457 described previously. The plasmid was then cotransfected with CCV DNA in a TK gene-mediated selectable homologous recombination. The recombinant progeny were selected by resistance to 0.1 mM acycloguanosine (acyclovir) and the production of blue plaques in the presence of 5-bromo-4-chloro-3-indolyl-β-D-galactopyranoside (X-gal). The resultant construct (CCVlacZ) was TK?, and contained the lacZ gene at both TK loci in the genome. β-Galactosidase expression in infected CCO ceils reached 0.53 μg per 106 CCO cells at 12 h post-infection. When channel catfish fingerlings were immersion exposed to CCVlacZ, these developed an antibody response to the inserted foreign gene product which peaked at approximately 15–20 days post-infection. Additionally, the anti-β-galactosidase response was significantly enhanced when the fingerlings were re-exposed to the virus 20 days after the initial exposure. These results demonstrate that foreign genes can be inserted into and expressed by CCV and that such constructs could be used as vaccine vectors. 相似文献
12.
Channel catfish virus (CCV) disease is an acute haemorrhagic disease in juvenile channel catfish ( Ictalurus punctatus ). To date channel catfish is the only species affected by natural outbreaks of the CCV but juvenile large mouth bass ( Micropterus salmoides ) and silurus ( Silurus meriaionalis ) have suffered high mortalities in recent years in China. Histopathological phenomenon of sick fish is similar to CCV disease, and the identified virus was CCV. In this report, the pathogenicity of infectious CCV was examined by infection trials on the first known host species, the channel catfish and other teleosts. Our results indicated that there were higher detection rates of CCV from large mouth bass and silurus fish. Channel catfish virus did not induce mortality in other cypriniformes, but histopathological studies revealed that carp might be infected by both bathing and intraperitoneal infection. No deaths, clinical or histopathological signs, were found in the six other species exposed by immersion or injection. Experimental infection studies confirm that CCV infect not only channel catfish but also other species (large mouth bass, silutus and carp). The outbreaks of CCV disease only occurred when the cultured temperature was above 25 °C. 相似文献
13.
14.
Channel catfish virus (CCV) causes an acute haemorrhagic disease in channel catfish, Ictalurus punctatus (Rafinesque), fry and fingerlings. The present study describes a polymerase chain reaction (PCR)-based assay for detection of CCV DNA in the tissues of acutely infected juvenile catfish. The assay is rapid, sensitive and specifically detects CCV DNA derived from epidemiologically distinct viral isolates. The use of two independent PCR primers sets, each specific for particular CCV genes (open reading frames 8 and 59), provides a means to confirm the results and minimize false-positive results. The method identifies CCV DNA in several tissues of acutely infected fish, including the brain, blood, intestine, kidney and liver. The CCV PCR assay is useful for the diagnosis of acute CCV disease and for studies to investigate the molecular basis of CCV pathogenesis. 相似文献
15.
《Aquaculture (Amsterdam, Netherlands)》1987,65(1):1-5
Although channel catfish virus (CCV) is thought to be vertically transmitted, no mechanism has been demonstrated for such a process. When contained in small volumes of saline, CCV associated rapidly with channel catfish leukocytes and sperm, associated slowly with a continuous cell line of channel catfish cells and did not adhere to channel catfish eggs. This virus-sperm adherence appeared to be a mechanism by which eggs might become infected with virus. However, virus-sperm adherence was not detected when sperm were added to 250 ml of CCV-containing water, indicating that sperm are probably not involved with transmitting CCV into eggs from water or ovarian fluid. Egg infections in channel catfish, if they occur, must be accomplished by mechanisms different from those thought to be involved in the infection of salmonid eggs by infectious hematopoietic necrosis virus. 相似文献
16.
Abstract. Two populations of channel catfish were examined for the presence of channel catfish virus (CCV) by use of a nucleic acid probe. In one population of 22 fish with no history of CCV, viral DNA was found in every liver. These fish had previously been examined by a technique involving co-cultivation of their leucocytes with catfish tissue culture cells. The co-cultivation method had identified virus in 10 of these fish. The second fish population consisted of 14 adults that had survived a CCV outbreak in 1980. Of the 14 fish, 11 showed positive indication of CCV DNA. The tissue distribution of the CCV differed from fish to fish. All fish from the first group and one fish from the second group showed some alterations in the DNA banding patterns expected from pure CCV DNA. This might be indicative of modifications in the genomic structure of the CCV DNA when the virus is latent in a fish. 相似文献
17.
Abstract Two groups of European catfish, Silurus glanis L., fingerlings were infected with channel catfish virus (CCV) by either intraperitoneal injection with 105 TCID50 of CCV, or bathing in water containing 105 TCID50 of CCV per 1·0 ml. The virus was isolated from spleen, intestine and brain of CCV-injected fish at day 1 and the titres ranged from 102·1 to 103·3 TCID50 /g. However, the tissue distribution of CCV was irregular and no virus was isolated after day 3 post-exposure. In CCV-bathed fish, the virus was isolated only from the liver of one specimen at day 3 post-exposure. No clinical signs of CCV disease developed in any of the fish. Specimens in each regime from all sampling periods showed some minor histopathological changes, but there were no differences between treatments. Lesions included oedema and focal haemorrhage in the liver and the spleen was congested. Electron micrographs of tissue samples showed the presence of a few virus particles around the nuclei of kidney, spleen and intestinal cells, and in or around a myelinated nerve within the optic lobes of infected fish during the first 4 days of infection. 相似文献
18.
A nucleic acid probe for channel catfish virus (CCV) was constructed using recombinant DNA techniques. This probe consisted of a specific viral DNA fragment generated by digestion of CCV DNA with the restriction enzyme EcoRI. The probe was used to examine DNA isolated from tissues of fish that had been injected with CCV. Viral DNA was detected in some tissues of various injected fish. The sensitivity limit of detection was determined to be one viral DNA per cell. 相似文献