CN1680444A - 抗香石竹斑驳病毒的单克隆抗体及其用途 - Google Patents
抗香石竹斑驳病毒的单克隆抗体及其用途 Download PDFInfo
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Abstract
本发明公开了一种抗香石竹斑驳病毒的单克隆抗体及其用途。用提纯的香石竹斑驳病毒免疫的BALB/C鼠脾细胞与SP2/0鼠骨髓瘤细胞融合,经筛选克隆,获得5株能稳定传代并分泌抗CarMV单克隆抗体(MAb)的杂交瘤细胞,并分别制备它们的单抗腹水。5株单克隆抗体腹水间接ELISA效价在10-6以上,3G1、1B9、2A9和2F8的单克隆抗体类型及亚类均为IgG1,2F2的单克隆抗体类型及亚类为IgG3。5株单抗与CarMV有特异反应,而与其他病毒无交叉反应。利用这些单抗建立了对检测CarMV有高度特异性、灵敏性和正确性的ACP-ELISA、DAS-ELISA、和TAS-ELISA方法。本发明提供的香石竹斑驳病毒的单克隆抗体为CarMV的快速检测诊断、分型和分子生物学研究提供物质基础和技术支撑,为该植物病毒病的防治打下基础。
Description
技术领域
本发明所属的领域为生物技术领域,尤其是涉及一种抗香石竹斑驳病毒的单克隆抗体及其用途。
背景技术
香石竹,又称康乃馨,是世界上四大鲜切花之一,也是我国主要的鲜切花(我国香石竹栽培发展很快,年产鲜切花达10亿枝以上)。但香石竹病毒广泛发生于世界香石竹栽培地区,引起香石竹品种退化,长势衰弱,植株畸形,花叶、花条变小,花碎色,叶茎和花出现枯斑,产量和品质下降,降低观赏价值和经济价值。发现感染香石竹的病毒有10多种,其中香石竹斑驳病毒(CarMV)是最主要的病毒之一。香石竹斑驳病毒(Carnation mottle virus,CarMV)是属于番茄丛矮病毒科(Tombusviridae),麝香石竹斑驳病毒属(Carmovirus)的典型成员,病毒粒子呈正二十面体,直径28-33nm。Guilley等(1985)和Carrington等(1984)报道表明,CarMV基因组为单组分单链正义RNA,含4003nt,包括4个ORF,其中ORF2和ORF3与ORF1具有共同的起始位点,分别为一次通读区和双重通读区,ORF4编码38KD的外壳蛋白。CarMV依靠汁液摩擦传播,能侵染香石竹、中国石竹、甜石竹、苋色藜、菠菜、千日红等多种植物。CaMV在我国上海、北京、昆明等香石竹产地广泛流行,发病严重,因而迫切需要建立快速、准确、简单方便的检测方法,为该病毒病的诊断和防治,脱毒种苗的生产提供技术支撑和物质支持。目前,已报道的CarMV的检测方法有电镜观测和多抗组合成的血清学检测方法两种,但电镜观测法需要昂贵的电子显微镜而不能普及,多抗组合成的血清学检测方法由于多抗存在非特异性高、准确性和均质性差、产量有限等缺陷而使这些血清学方法存在不足,本研究运用我们研制的CarMV特异性单克隆抗体具有特异性强、均质性好、可无限量生产等优点从而使用该单抗建立的ELISA血清学方法具有准确性强、易标准化和大规模生等特点。此方法已有效地用于CarMV在田间作物上的检测,为该病毒病的诊断和防治,脱毒种苗的生产服务。
发明内容
本发明的目的是提供一种抗香石竹斑驳病毒的单克隆抗体及其用途。
抗香石竹斑驳病毒(CarMV)的单克隆抗体是:3G1、1B9、2A9、2F8、2F25株单克隆抗体腹水的间接ELISA效价在10-6以上;3G1、1B9、2A9、2F8的单克隆抗体类型及亚类均为IgG1,2F2的单克隆抗体类型及亚类为IgG3;5株单抗分别识别CarMV病毒上5个不同的位点;5株单抗均与CarMV有特异反应,而与其他病毒无交叉反应。
所述单克隆抗体建立的ACP-ELISA、DAS-ELISA、和TAS-ELISA方法检测抗香石竹斑驳病毒。
本发明的优点是:1)提供的CarMV病毒特异性单克隆抗体,运用ACP-ELISA、DAS-ELISA、和TAS-ELISA能够高度特异、准确、灵敏的检测CarMV;2)利用本发明所制备的单克隆抗体检测CarMV,不需要昂贵的电子显微镜设备;3)利用本发明所制备的单克隆抗体,可有效地用于田间作物CarMV的检测。
具体实施方式
本发明制备了CarMV的特异性强、效价高、稳定性好、能大量生产的单克隆抗体,并用这些单抗建立了检测CarMV具有高度特异性、灵敏性和正确性的快速诊断方法-ELISA,可为香石竹种苗脱毒鉴定和抗病育种提供有力的技术和产品支持,对该病毒病的综合防治及增产保收提供直接的理论依据和技术保障,同时,可应用于进出口检验,检疫及CarMV疫情调查分析等方面。
单克隆抗体的制备
1.免疫原的制备
将CarMV分离物接种于中国石竹,15d后采集病叶,用10%PEG离心沉淀和蔗糖不连续密度梯度方法提取CarMV。病毒提纯液经2%磷钨酸(pH6.7)染色后置JEOL,JEM-1200EX电镜下观察粒子形态。
2.免疫动物
用提取CarMV病毒免疫四周龄体重18-20g BALB/C雌性小鼠:1mg/ml提取CarMV病毒0.5ml与等体积福氏完全佐剂混合,充分乳化后,经背腹部皮下多点注射0.2ml每只,间隔3周,取与一免等量抗原和等体积的福氏不完全佐剂充分乳化后,第二次腹腔注射0.2ml每只,过3周后用加倍剂量的抗原进行腹腔注射,3天后取脾细胞进行融合。
3.细胞融合
取上述免疫小鼠脾细胞与小鼠骨髓瘤细胞(SP2/0)按5-10∶1的比例,在无血清的RPMI-1640(Gibco)培养基中混匀,1500rpm离心5min,去除培养基,用50%PEG(Sigma)作为融合剂,在37℃下水浴下加入0.5-0.7ml,使其融合2min,用无血清的RPMI-1640培养基终止融合后1500rpm离心5min,沉淀用HAT培养基悬浮,分装到96孔含有饲养细胞的细胞板中,37℃,5%CO2的细胞培养器皿中培养。
4.杂交瘤细胞、阳性孔的筛选及其克隆
细胞培养器皿中培养5天后,用HAT培养基换液一次,第10天用HT培养基换液,等到融合细胞覆盖孔底5%-50%时,常规间接ELISA方法筛选阳性孔,共获150多个对CarMV有反应的阳性孔,阳性率为31%。选择10个呈强阳性反应的细胞孔,进行有限稀释法克隆,获得3G1、1B9、2F2、2A9和2F8 5株能分泌抗CarMV的特异性抗体的杂交瘤细胞株。经6个月以上体外传代和多次冻存复苏后,5株细胞株均能良好生长,并稳定分泌抗体。经扩大培养后,用于腹水制备和液氮保存。
5.单克隆抗体的特异性检测
用提纯的香石竹斑驳病毒(CarMV)、甘蔗花叶病毒(SCMV)、芜菁花叶病毒(TuMV)、番茄花叶病毒(ToMV)、烟草花叶病毒(TMV)、黄瓜花叶病毒(CMV)、蚕豆萎蔫病毒1(BBWV-1)、蚕豆萎蔫病毒2(BBWV-2)、香石竹环斑病毒(CaRSC)、马铃薯X病毒(PVX)和马铃薯Y病毒(PVY)1ug/ml包被ELISA反应板,以相应的健叶提取液作阴性对照,用间接ELISA法,分别测定5株单抗的特异性反应。间接ELISA方法具体为上述病毒分别用包被液稀释成1ug/mL后100ul/孔包被ELISA板,4℃过夜或37℃2小时,使其吸附于聚苯乙烯板孔;PBST洗涤三次后用1-10%的脱脂奶粉或1-3%BSA或3-6%牛血清封闭30-60min;加入单抗100ul/孔,37℃ 1-2小时;PBST洗涤三次后加入按说明书稀释10000倍的碱性磷酸脂酶(AP)标记兔抗鼠IgG二抗(Sigma公司)100ul/孔,37℃ 1-2小时,PBST洗涤四次后,用PNPP底物显色,2mol/L氢氧化钠终止反应后,用酶标仪读取OD405的值,以与阴性OD值比值大于2.1为阳性。结果发现,5株单抗对CarMV有特异性反应,而与TMV、ToMV、CMV、SCMV、PVY、PVX、BBWV1、BBWV2、TuMV、CaRSC其他病毒均无特异性反应。
6.单克隆抗体腹水制备及纯化
取8周龄左右BALB/C小鼠,腹腔注射0.3-0.5ml降植烷(Sigma),7-10天后腹腔注入5-10×105个杂交瘤细胞,注射后7-10天可见小鼠腹部明显膨大,采取腹水,3000rpm离心3min,收集上清液,即为单克隆抗体腹水。取1倍体积腹水加2倍体积0.06M PH4.8醋酸缓冲液稀释,加辛酸(30ul/ml腹水),室温下边加边搅拌,4℃澄清1小时,12000rpm离心20min,收集上清,再用50%饱和硫酸铵沉淀免疫球蛋白,4℃放置2小时,3000rpm离心20min,沉淀用2倍体积的PBS溶液溶解,在4℃流动透析24小时后即获纯化的腹水抗体,-70℃保存。
7.单克隆抗体的亚类鉴定和腹水效价测定
将纯化的单抗腹水与Sigma公司的标准抗BALB/C小鼠IgG,IgG1,IgG2a,IgG2b、IgG3,IgM抗体,作双向琼脂扩散试验,结果为,3G1、1B9、2A9和2F8亚类均为IgG1,2F2为IgG3。用常规间接ELISA方法检测单抗腹水效价,结果为上述5株腹水效价均在10-6以上。
8.AP-抗CarMV单克隆抗体结合物的制备
将30mg AP和1.0mg纯化的单克隆抗体混匀于0.5ml PBS(0.01mol/l、PH7.2),加入戊二醛至终浓度为0.2%,于室温下温和搅拌2小时。反应物中加入10MMTris-HCL(pH8.0,0.15M NaCl,1MM MgCl2)至1ml,然后用上述Tris-HCL缓冲液于4C流动透析24小时。透析以后的产物即为AP-单克隆抗体结合物,结合物中加入灭菌甘油至50%(V/V),于-20℃保存备用。
9.单克隆抗体识别位点分析
3ug/ml抗原(提纯CarMV)100ul/孔于96孔ELISA板中,4℃包被过夜;用PBST洗涤三次,2% BSA 150ul/孔37℃,封闭1小时,加一种单抗腹水50ul及AP标记的另一种单抗50ul,37℃ 1小时;PBST洗涤三次后加硝基苯磷酸盐底物100ul/孔,37℃20分钟,OD405测定吸收值。以单抗腹水对同一AP标记的单抗抑制为100%,以已知无关单抗腹水对标记单抗的抑制为阴性对照,计算各单抗间的抑制率。即抑制率为(1-测定值OD/阴性对照值OD)X100。抑制率>75%为相关,>50%为不完全相关,<50%为不相关,<25%为完全不相关,结果表明5株抗CarMV单抗识别5个不相关的抗原结合位点。
10.用单抗建立间接抗原包被ELISA(ACP-ELISA)方法检测病毒
ACP-ELISA方法的操作步骤
(1)用碳酸盐缓冲液(pH9.6)30倍稀释的病叶汁液100ul/孔加入ELISA板,CarMV病叶为阳性对照,相应健叶为阴性对照,37℃ 2h,或4℃过夜;
(2)PBST洗涤后用5%脱脂奶粉封闭30min;
(3)单抗腹水5000倍稀释后100ul/孔,37℃ 1h;
(4)PBST洗涤后加入5000倍稀释的AP标记的羊抗鼠IgG结合物(Sigma),
100ul/孔,37℃,1h;
(5)用PBST洗涤后加入硝基磷酸盐底物100ul/孔,室温30min;
(6)用肉眼观察,底物颜色变成黄绿色的孔为阳性,或用酶联免疫检测仪测
OD405值,以P/N>2.1作为阳性判断标准。
ACP-ELISA方法检测灵敏度检测
单抗腹水工作浓度为5000倍稀释,对病叶从1∶5至5120作倍比稀释,提纯病毒(5mg/l)从1∶1000至1∶1024000作倍比稀释,分别以相应稀释度的健叶汁液作阴性对照,进行上述ACP-ELISA方法检测。结果表明ACP-ELISA方法对1∶5~800倍稀释的病叶汁液均呈阳性反应,即对检测病叶的灵敏度可达到1∶800,ACP-ELISA方法对纯病毒的检测灵敏度可达1ng/ml,每孔的病毒绝对量检测为0.1ng。表现ACP-ELISA方法具有高度的灵敏性和可靠性。
11.CarMV的单抗DAS-ELISA检测方法
1)抗CarMV的一株单抗2F2 5000倍稀释100ul/孔包被聚苯乙烯板,37℃,2-4h或4℃,过夜;
2)PBST洗涤三次后加1-10%的脱脂奶粉或1-3% BSA或3-6%牛血清封闭200ul/孔于37℃封闭30-60min
3)加入检测样品100ul/孔。以CarMV为阳性对照,以相应的健康样品作阴性对照,37℃ 1-2h;
4)BST洗涤后加入10000倍稀释碱性磷酸脂酶(AP)标记另一单抗3G1结合物100ul/孔,37℃ 1-2h
5)PBST洗涤后加PNPP底物于室温显色5-30min,2mol/L氢氧化钠终止反应后,肉眼观察底物颜色变成黄绿色的孔为阳性或用680型酶联免疫检测仪测405nm的OD值,以P/N>2.1作为阳性判断标准。
DAS-ELISA方法检测灵敏度检测
对病叶从1∶5至5120作倍比稀释,提纯病毒(5mg/l)从1∶1000至1∶1024000作倍比稀释,分别以相应稀释度的健叶汁液作阴性对照,进行上述DAS-ELISA方法检测。结果表明DAS-ELISA方法对1∶5~1000倍稀释的病叶汁液均呈阳性反应,即对检测病叶的灵敏度可达到1∶1000,DAS-ELISA对纯病毒的检测灵敏度可达0.1ng/ml,每孔的病毒绝对量检测为0.01ng。表现DAS-ELISA方法具有高度的灵敏性和可靠性。
12.CarMV的TAS-ELISA检测方法
12.1.TAS-ELISA方法的操作流程:
1)抗CarMV的兔抗血清(本所自制)100ul/孔包被聚苯乙烯板,37℃,2-4h或4℃,过夜;
2)PBST洗涤三次后加1-10%的脱脂奶粉或1-3%BSA或3-6%牛血清封闭200ul/孔于37℃封闭30-60min
3)加入检测样品100ul/孔。以CarMV为阳性对照,以相应的健康样品作阴性对照,37℃ 1-2h;
4)洗涤后用封闭液稀释的单抗腹水100ul/孔,37℃ 1-2h
5)PBST洗涤后加入10000倍稀释碱性磷酸脂酶(AP)标记兔抗鼠IgG二抗结合物(Sigma)100ul/孔,37℃ 1-2h
6)PBST洗涤后加PNPP底物于室温显色5-30min,2mol/L氢氧化钠终止反应后,肉眼观察底物颜色变成黄绿色的孔为阳性或用680型酶联免疫检测仪测405nm的OD值,以P/N>2.1作为阳性判断标准。
12.2.TAS-ELISA检测方法最适条件的确定:
采用TAS-ELISA方阵试验进行,即横向加兔抗CarMV血清(本所自制)用包被缓冲液从1∶100至1∶102400倍比稀释;CarMV 1ug/ml;纵向加用PBST缓冲液从1∶5至1∶2048000倍比稀释单抗腹水;AP标记的兔抗鼠IgG二抗按Sigma公司说明书稀释,1∶10000倍;按TAS-ELISA方法流程进行操作。结果为CarMV的兔抗血清最适稀释度均为1∶5000;3G1、1B9、2A9、2F2和2F8的最适稀释度分别为1∶5000,1∶8000,1∶8000,1∶10000,1∶5000。
12.3.TAS-ELISA方法检测灵敏度的确定
在兔抗血清和单抗腹水最适工作浓度下,将1ug/ml的CarMV用含1-3% BSAPBST倍比稀释后进行TAS-ELISA测定,结果为:TAS-ELISA检测5株单抗的灵敏度均在0.01ng以上,说明本方法具有很好的灵敏度。
13.上述ELISA方法的田间检测CarMV的应用
利用制备的CarMV单抗建立的上述ELISA方法对田间香石竹进行检测。在杭州市区花卉市场和云南地区香石竹上采收呈病毒症状的病样,作1∶30倍稀释,然后进行上述ELISA检测,用健株汁液作阴性对照,接种CarMV的汁液作阳性对照。检测结果表明,香石竹上CarMV的带毒率很高,81%样品呈阳性,与电镜观察检测结果一致,这表明所制备的单克隆抗体和建立的上述ELISA方法能很好的用于田间CarMV的检测,同时,明确了香石竹斑驳病毒是田间香石竹流行的主要病毒种类。
Claims (2)
1.一种抗香石竹斑驳病毒的单克隆抗体,其特征是,3G1、1B9、2A9、2F8、2F2 5株单克隆抗体腹水的间接ELISA效价在10-6以上;3G1、1B9、2A9、2F8的单克隆抗体类型及亚类均为IgG1,2F2的单克隆抗体类型及亚类为IgG3;5株单抗分别识别抗香石竹斑驳病毒上5个不同的位点;5株单抗均与抗香石竹斑驳病毒有特异反应,而与其他病毒无交叉反应。
2.一种如权利要求1所述的抗香石竹斑驳病毒的单克隆抗体的用途,其特征是,所述单克隆抗体建立的ACP-ELISA、DAS-ELISA、和TAS-ELISA方法检测抗香石竹斑驳病毒。
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CN102140541A (zh) * | 2011-02-15 | 2011-08-03 | 北京林业大学 | 一种香石竹四种病毒的同步检测方法 |
CN101429562B (zh) * | 2008-11-10 | 2011-09-07 | 宁波检验检疫科学技术研究院 | 菜豆荚斑驳病毒荧光定量rt-pcr检测试剂及制备方法和应用 |
CN101429243B (zh) * | 2008-12-04 | 2011-09-07 | 浙江大学 | 三聚氰胺与载体蛋白偶联产物和三聚氰胺抗体的制备方法及用途 |
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CN101429562B (zh) * | 2008-11-10 | 2011-09-07 | 宁波检验检疫科学技术研究院 | 菜豆荚斑驳病毒荧光定量rt-pcr检测试剂及制备方法和应用 |
CN101429243B (zh) * | 2008-12-04 | 2011-09-07 | 浙江大学 | 三聚氰胺与载体蛋白偶联产物和三聚氰胺抗体的制备方法及用途 |
CN102140541A (zh) * | 2011-02-15 | 2011-08-03 | 北京林业大学 | 一种香石竹四种病毒的同步检测方法 |
CN102140541B (zh) * | 2011-02-15 | 2012-11-21 | 北京林业大学 | 一种香石竹四种病毒的同步检测方法 |
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