鸭瘟病毒单抗的制备及胶体金试纸条检测方法的建立

doi:10.3864/j.issn.0578-1752.2016.14.013

摘要/Abstract

摘要： 【目的】鸭瘟（DP）是由鸭瘟病毒（DPV）引起的一种急性、败血性传染病，以头颈肿胀、食道黏膜和泄殖腔黏膜出血、黄白色溃疡，头颈部皮下有黄白色胶冻样渗出为特征。该病一旦发生，发病急、死亡快、死亡率高，对养鸭业危害严重。快速诊断是控制鸭瘟的重要措施之一，可以及时确定病原，以便采取有效的防制手段。试验旨在建立鸭瘟病毒（DPV）胶体金快速检测方法。【方法】利用生物学软件Protean分析，选择鸭瘟病毒抗原表位较多的一段序列设计引物，PCR扩增目的基因。连接到载体pMD-18T上，测序正确后再连接到原核表达载体pET-28a上。将获得的重组质粒转化至Rosetta感受态细胞中进行诱导表达。表达的蛋白经纯化后测其浓度并经Western blotting鉴定分析。以表达的DPV-gB蛋白作为抗原，免疫7周龄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筛选及亚克隆，获得DPV-gB特异性单克隆抗体。采用柠檬酸三钠还原法制备胶体金颗粒，以制备的 H6F6单抗作为标记抗体（标记的最适pH为8.0—8.5，最佳标记浓度为15倍原液稀释），将纯化的A8D7单抗（浓度为2倍原液稀释）和羊抗鼠IgG（浓度为10倍稀释）包被在硝酸纤维素膜（NC）上，分别作为检测线和质控线，经条件优化建立了鸭瘟病毒胶体金试纸条检测方法。【结果】共获得4株能稳定分泌抗DPV-gB蛋白抗体的杂交瘤细胞株，命名为A8D7、E6C3、H11F8、H6F6。间接ELISA检测腹水效价分别为1:10³、1:10³、1:10⁵、1:10³。亚类鉴定结果分别为IgG2b、IgG2a、IgG2b、IgG1，轻链均为kappa链。Western blotting结果显示4株单抗均能与DPV-gB蛋白特异性结合。IFA结果显示制备的4株单抗是针对DPV产生的。建立的胶体金试纸条方法能够特异性地检测鸭瘟病毒，与鸭坦布苏病毒、H9N2亚型禽流感病毒、呼肠孤病毒、减蛋综合征病毒无反应。阳性尿囊液稀释50倍后用该试纸条检测依然为阳性；用不同批次的试纸条重复检测，结果无差异。利用制备的胶体金试纸条和PCR方法对38份临床样品进行检测比较，结果显示两者符合率为91.6 % 。【结论】本研究建立的试纸条检测方法具有良好的特异性、敏感性、重复性和稳定性，可用于DPV的快速检测。

关键词: 鸭瘟病毒, gB蛋白, 原核表达, 单克隆抗体, 胶体金试纸条

Abstract: 【Objective】 Duck plague（DP） is an acute, septic contagion, caused by duck plague virus（DPV）, with the characteristics of head and neck swelling, the mucosa of esophageal and cloacal bleeding and yellowish-white ulcer, head and neck skin has a yellowish-white gelatin sample. Once an outbreak of this disease manifested by with high morbidity and high mortality, it would cause serious harm to the duck industry. The aim of this assay is to establish a method of colloidal gold strip for the detection of duck plague virus (DPV) rapidly. 【Method】 The main antigenic domain of DPV was chosen and analyzed by using of the Protean Biology software to design a pair of primer to amplify the aim gene by PCR. Then the fragment was inserted into prokaryotic expression vector pET-28a to construct recombinant plasmid. Then it was transformed into Rosetta for expression. During the experiment, the authors have groped the concentration of the IPTG and the induction time. After purification, the concentration of the aim protein was tested and was also analyzed and identified by Western blotting. Hybridoma cell lines stably secreting monoclonal antibody against gB protein of DPV were generated by fusing SP2/0 myeloma cells with splenocytes from the immunized mice, which used the gB protein of DPV, expressed and purified with prokaryotic, as the antigen. The monoclonal antibody-based colloidal gold immunochromatography strip was developed for the detection of DPV. The purified DPV-gB monoclonal antibody, named H6F6, was labeled with colloidal gold, with the appropriate pH between 8.0 and 8.5 and the concentration was 15 times dilution. The purified A8D7 monoclonal antibody, with the concentration of twice dilution, and the goat anti-mouse immunoglobulin G (IgG) antibody, with the concentration of ten times dilution, were blotted on nitrocellulose membrane as test line and control line, respectively. 【Result】 Hybridoma cell lines designated as A8D9, E6C3, H11F8, H6A10, stably secreting monoclonal antibody against gB protein of DPV. The titres of ascitic fluid was1:10³, 1:10³, 1:10⁵, 1:10³, respectively by indirect ELISA and the immunoglobulin subtype of the monoclonal antibodies was IgG2b, IgG2a, IgG2b, IgG1,with the light chain of kappa. The result of western blot showed that the four monoclonal antibodies were able to specifically recognize gB protein of DPV. The result of IFA showed that the four monoclonal antibodies were specific to DPV. The detection results indicated that the strip was specific to DPV and had no cross reaction with DRV, EDS-76V, AIV-H9N2, and TMUV. The detection limit of DPV were 50 times dilution. 38 clinical suspected samples were simultaneously detected by immunochromatography strip and PCR while the results showed 91.6 % accuracy between them. The monoclonal antibodies-based colloidal gold strip was highly specific and sensitive and more convenient for the clinical diagnosis of DPV.【Conclusion】The colloidal gold strip was highly specific and sensitive and more convenient for the clinical diagnosis of DPV.

Key words: duck plague virus, glycoprotein B, Prokaryotic expression, monoclonal antibody, colloidal gold strip

赵丹丹，杨国平，刁有祥，陈浩，提金凤，张璐，张英，李川川. 鸭瘟病毒单抗的制备及胶体金试纸条检测方法的建立[J]. 中国农业科学, 2016, 49(14): 2796-2804.

ZHAO Dan-dan, YANG Guo-ping, DIAO You-xiang, CHEN Hao, TI Jin-feng, ZHANG Lu, ZHANG Ying, LI Chuan-chuan. Preparation of Monoclonal Antibodies Against DPV and Development of Colloidal Gold Strip for DPV Detection[J]. Scientia Agricultura Sinica, 2016, 49(14): 2796-2804.

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