抗猪传染性胃肠炎M蛋白单克隆抗体的制备及部分特性鉴定

以纯化的猪传染性胃肠炎病毒重组M蛋白免疫BALB/c小鼠,按常规方法进行融合、筛选,最终获得3株抗TGEVM蛋白的杂交瘤细胞系1B3、3C2、4A5,染色体平均记数为89对、92对、90对,间接ELISA检测1B3、3C2、4A5细胞培养上清的效价分别为1/4000、1/1000、1/4000,腹水效价分别为2×10~4、2×10~5、2×10~5。通过间接ELISA做病原检测,这3株单抗不与猪流行性腹泻病毒、猪伪狂犬病病毒和猪轮状病毒发生交叉反应,而与传染性胃肠炎病毒显示良好的特异性。用制备的单抗通过间接免疫荧光做病原检测,发现染色后TGEV感染的细胞培养物在胞浆和细胞膜上出现黄绿色荧光,未接种病毒的细胞培养物未见有黄绿色闪亮荧光,结果表明,所制备的抗重组TGEVM蛋白的单抗对病原检测具有很高的特异性,为TGEV准确快速的病原诊断和TGEV感染相关的基础性研究提供了物质基础。     

脑心肌炎病毒单克隆抗体的制备与鉴定

为了制备脑心肌炎病毒(EMCV)的单克隆抗体,并对其进行鉴定。应用杂交瘤细胞技术,将灭活EMCV免疫的小鼠脾细胞与骨髓瘤细胞融合,HAT选择培养、间接ELISA法筛选和多次克隆化,筛选出稳定分泌抗猪EMCV的杂交瘤细胞株,并对其分泌的单克隆抗体进行了亚型、效价、特异性和细胞株染色体核型的分析。结果获得了1株能分泌抗EMCV单克隆抗体的细胞株,命名为EMCV Y1G9,其分泌的抗体亚型为Ig G2b类;腹水效价可达3.2×104;细胞株的染色体核型分析结果是染色体众数为92±2,单抗的特异性也较好。制备出了具有良好特异性和敏感性的抗EMCV的Mc Ab,为建立EMCV的特异性检测方法及该病的防制奠定了基础。     

达氟沙星单克隆抗体的制备与鉴定

采用碳二亚胺法将达氟沙星与BSA和OVA偶联制成免疫抗原DFLX-BSA、检测抗原DFLX-OVA。采用FeCl3显色反应、紫外扫描分析法对合成的抗原进行了鉴定。用免疫抗原DFLX-BSA腹腔免疫BALB/c小鼠,有限稀释法筛选获得分泌特异性抗体的杂交瘤细胞株1株4F9,单抗亚型鉴定为IgG1,并将此细胞株注射小鼠腹腔获得腹水,用辛酸-硫酸铵法对腹水进行了纯化。纯化后的抗体效价为2.48×10-6,紫外分析方法计算蛋白含量为1.348 mg/mL。     

O型口蹄疫病毒单克隆抗体的制备和鉴定

利用O型口蹄疫病毒(FMDV)免疫BALB/c小鼠,取其脾细胞与Sp2/0细胞进行融合,经间接ELISA方法筛选和7次亚克隆后获得2株能稳定分泌单克隆抗体(MeAb)的杂交瘤细胞株.经间接ELISA检测,2株杂交瘤细胞株(3E1、7E6)的腹水效价分别为1:25 600、1:102 400.间接免疫荧光试验和特异性试验表明2株McAb可与不同株的O型FMDV反应,而不与其他血清型的FMDV反应.Western blot和叠加试验表明2株单抗可识别0型FMDV结构蛋白VP1上的同一个抗原表位.此特异性McAb的获得将为O型FMDV疫苗的研制和诊断方法的建立奠定基础.     

猪传染性胃肠炎病毒spike蛋白C抗原位点的原核表达研究

为猪传染性胃肠炎病毒(TGEV)的血清学检测方法的建立提供必要的诊断抗原,通过基因重组的方法,在大肠杆菌表达系统中表达了猪传染性胃肠炎病毒(TGEV)spike蛋白C抗原位点。Western blot试验表明:表达的重组蛋白具有良好的抗原性。研究为TGEV血清学检测方法的建立提供了必要的物质基础。     

猪传染性胃肠炎病毒重组M蛋白免疫血清在病原检测中的应用

以纯化的猪传染性胃肠炎病毒（TGEV）重组M蛋白免疫新西兰兔，制备免疫血清，用间接ELISA测得免疫血清效价达1：14000。通过间接ELISA进行病原检测，表明制备的免疫血清与全病毒具有较好的特异性。用免疫血清进行病原间接免疫荧光检测，TGEV感染的细胞培养物中多数细胞在其胞浆和细胞膜上出现黄绿色闪亮荧光，且荧光强度强，而未接种病毒的细胞培养物未见有黄绿色闪亮荧光，表明用所制备的抗TGEV重组M蛋白的免疫血清进行病原间接免疫荧光检测具有较高的特异性，为TGEV准确快速诊断与鉴别奠定了基础。     

抗猪传染性胃肠炎病毒重组S蛋白单克隆抗体的制备与鉴定

以纯化的猪传染性胃肠炎病毒(TGEV)重组S蛋白免疫BALB/c小鼠,通过细胞融合技术,间接ELISA方法进行筛选和有限稀释法3次克隆,获得2株稳定分泌抗TGEV重组S蛋白单克隆抗体的杂交瘤细胞株,分别为C7C882和B5G8G7,其染色体平均计数均为88±10对,制备腹水抗体效价分别为1:2×105和1:104,分泌抗体亚类均为IgM型.2株杂交瘤细胞上清与猪流行性腹泻病毒(PEDV)、猪轮状病毒(PRV)、猪伪狂犬病病毒(PrV)均无交叉反应,与TGEV感染细胞经间接免疫荧光检测均呈黄绿色荧光.     

阿维菌素类药物单克隆抗体的制备和鉴定

将阿维菌素与牛血清白蛋白偶联,免疫Balb／c小鼠,用杂交瘤技术获得了1株分泌抗阿维菌素特异性抗体的杂交瘤细胞株。用间接ELISA测定腹水的效价为1：160000,抗体的50％抑制药物浓度（IC50）为2．5ng／ml,抗体与伊维菌素的交叉反应为12．5％,与多拉菌素、莫西菌素均无交叉反应。     

猪传染性胃肠炎病毒陕西株的分离鉴定

从陕西省某猪场临床上表现为腹泻症状的病死仔猪肠道内容物及粪便材料中分离获得1株病毒,采用PK-15细胞培养、理化试验及中和试验鉴定后,证实该分离株为猪传染性胃肠炎病毒(TGEV).克隆分离株N基因,并将该基因核苷酸序列和推导的氨基酸序列与其他不同来源的TGEV毒株进行比较分析.结果表明,分离株N基因与其他毒株核苷酸的同源性为94,3％～98.3％,氨基酸同源性为95.6％～99.4％.系统进化树结果表明,分离株与TGEV HN2002株(河南株)亲缘关系最近.     

Neutralization of porcine transmissible gastroenteritis virus by complement-dependent monoclonal antibodies

Monoclonal antibodies (MAB) to each of the 3 major structural proteins of transmissible gastroenteritis virus (TGEV) of swine were compared, using their virus-neutralizing (VN) activity in the presence or absence of guinea pig, rabbit, or swine complement. The MAB against the peplomer protein had similar VN titers for TGEV in the presence or absence of complement from any source. The MAB against the matrix protein had VN activity for TGEV only in the presence of complement, whereas MAB specific for the nucleocapsid protein did not possess VN activity in the presence or absence of complement. Serum from sows containing antibodies against TGEV peplomer and matrix proteins had slightly higher VN titers in the presence of complement than in the absence of complement. High concentrations of complement from swine serum (128 U) had little effect on the infectivity of TGEV for swine testes cells, whereas 32 U of complement from rabbit serum and 64 U of complement from guinea pig serum were able to neutralize virulent and attenuated TGEV in the absence of known antibodies for TGEV. Complement (less than or equal to 8 U) from any source did not decrease the infectivity of TGEV by greater than 0.5 log10 units.     

Antigenic variation of porcine transmissible gastroenteritis virus detected by monoclonal antibodies

Mouse myeloma cells (SP2/O) were fused with spleen cells from BALB/c mice immunized with detergent-solubilized antigen of purified virus, and 21 monoclonal (MC) antibodies reactive in enzyme-linked immunosorbent assay with the TO-163 strain of porcine transmissible gastroenteritis (TGE) virus were obtained. Of these MC antibodies, 14, 6 and 1 were IgG1, IgG2a and IgM, respectively. All of the MC antibodies contained light chains of the kappa type. Of these MC antibodies, 8 were found to have neutralization (NT) activity against the TO-163 strain. Comparison of 7 strains of TGE virus by NT tests using our panel of MC antibodies confirmed their close antigenic relationships, but also revealed the occurrence of distinct antigenic differences. These results suggest that there may be at least 6 different epitopes involved in NT reaction on the virion of the TO-163 strain. This notion was confirmed by the competitive binding assay.     

水泡性口炎病毒单克隆抗体的制备与鉴定

将水泡性口炎病毒（VSV）经差速离心和蔗糖密度梯度离心法进行纯化后,以纯化的VSV作为免疫原免疫8～10周龄雌性BALB/c小鼠,取其脾细胞与SP2/0骨髓瘤细胞进行融合,经间接ELISA方法筛选能稳定分泌抗VSV单克隆抗体的杂交瘤细胞株,并对制备出的抗VSV单抗的特异性、抗体亚类等生物学特性进行鉴定。结果显示,试验成功筛选出2株能稳定分泌抗VSV单克隆抗体的杂交瘤细胞株,分别命名为1A2、4C3。ELISA鉴定结果表明,2株单抗均能特异性地与VSV结合,而与口蹄疫病毒（FMDV）、猪水泡病病毒（SVDV）均不发生交叉反应;诱生小鼠腹水产生的抗体效价可达1∶25 600～1∶51 200。杂交瘤细胞染色体核型鉴定结果显示,杂交瘤细胞染色体数为95～105,均高于2个亲本细胞的染色体数目,说明这2株细胞是两者的杂交产物。抗体亚类鉴定结果显示,所获得2株单抗1A2、4C3均为IgG1。Western blot分析结果表明,1A2可识别VSV G蛋白。2株抗VSV单克隆抗体的成功制备将为VSV快速检测方法的建立以及检测试剂的研制等奠定基础。     

猪流行性腹泻病毒M蛋白单克隆抗体的制备及鉴定

为制备猪流行性腹泻病毒(PEDV)抗M蛋白单克隆抗体(MAb),本研究以截短表达的His-M重组蛋白免疫BALB/c小鼠;以截短表达的GST-M重组蛋白作为包被抗原,采用常规的淋巴细胞杂交瘤技术制备杂交瘤细胞,通过间接ELISA进行筛选,得到一株稳定分泌抗M蛋白MAb.MAb亚类鉴定为IgG2b型,轻链为к链,杂交瘤细胞培养上清和诱导的小鼠腹水抗体效价分别为1:3000和1:2×105.Western blot试验表明该MAb能够识别重组及天然的PEDV M蛋白.间接免疫荧光试验表明该MAb能够与PEDV感染的Vero E6细胞产生特异性免疫荧光.     

Detection of antibody against transmissible gastroenteritis virus of pigs by indirect immunoperoxidase antibody test

Immunoperoxidase intibody (IPA) test was developed for detecting antibody against transmissible gastroenteritis (TGE) virus of pigs. The IPA antibody titers in sera collected in the field from 82 pigs were approximately seven times higher than those obtained in a serum-neutralization test. The correlation between the TGE antibody concentrations in the IPA and serum neutralization tests was positive (r = +0.74). The IPA tests appears to have the potential for routine laboratory use for serologic diagnosis of TGE.     

Inhibition of virus attachment to CPK cells by monoclonal antibody to transmissible gastroenteritis virus.

Five MAbs, which recognized E2 glycoprotein of TGE virus TO-163 and showed neutralizing activity, were examined to see if they inhibit virus attachment to the susceptible cells (CPK cells). Only one (160/4) MAb blocked the virus attachment to the cells, indicating that the inhibition of virus attachment is one of important mechanisms of neutralizing by antibody.     

鲤春病毒血症病毒单克隆抗体制备及鉴定

为制备鲤春病毒血症病毒(SVCV)单克隆抗体(MAb),本研究用纯化的SVCV免疫BALB/c鼠,通过杂交瘤细胞技术,制备2株抗SVCV的MAb,分别命名为2A3和3H7。经间接ELISA检测腹水效价为1:10240和1:12150。亚类鉴定证实,这2株亚类均为IgG1型。经非竞争酶免疫试验测定2A3和3H7的抗体亲和力常数分别为4.86×108L/mol和1.86×109L/mol,3H7相对亲和力高于2A3。MAb 2A3和3H7的饱和度均为1:400,叠加试验所得增值指数为63.2%,大于50%。抗体反应增值结果表明:两株MAb分别针对不同抗原位点。免疫印迹分析检测表明,两株纯化的MAb均可与SVCV抗原发生特异反应。     

相思子毒素-α单克隆抗体的制备与鉴定

用含1%甲醛的磷酸盐缓冲液对相思子毒素-a(abrin-a)减毒处理制备类毒素,以类毒素为免疫抗原分4次免疫3只BALB/c小鼠.采用聚乙二醇(PEG)法,取免疫脾细胞与小鼠骨髓瘤细胞(SP2/0)融合,筛选分泌抗abrin-a的单克隆抗体(MeAb)杂交瘤细胞株.将阳性细胞株接种BAI.B/c小鼠制备McAb腹水,根据亚类鉴定结果,分别采用蛋白A或蛋白G亲和层析柱纯化腹水,间接酶联免疫吸附试验(ELISA)检测McAb特异性,Western-blot法分析McAb抗原识别位点.结果获得1G5、3C2和4G1共3株McAb杂交瘤细胞株,均为抗abrin-a的特异性McAb,与相思子凝集素、蓖麻毒素(ricin)和蓖麻凝集素均无交叉反应,其中4G1为特异性结合abrin-a A链的MCAb,1G5和3C2两株为特异性结合abrin-a B链的MCAb;制备的MCAb可用于abrin-a含量的检测.