CN108414762A - 一种草鱼IgM单克隆抗体、其制备方法及其应用 - Google Patents
一种草鱼IgM单克隆抗体、其制备方法及其应用 Download PDFInfo
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- CN108414762A CN108414762A CN201810031357.4A CN201810031357A CN108414762A CN 108414762 A CN108414762 A CN 108414762A CN 201810031357 A CN201810031357 A CN 201810031357A CN 108414762 A CN108414762 A CN 108414762A
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- carp igm
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Abstract
本发明公开了一种草鱼IgM单克隆抗体、其制备方法及其应用;草鱼IgM单克隆抗体由保藏号为C2017130的杂交瘤细胞株产生;草鱼IgM单克隆抗体的应用为将草鱼IgM单克隆抗体应用于检测鱼类Ig水平的试剂或试剂盒的制备、应用于治疗鱼类病毒感染的药物的制备、应用于评价鱼类疫苗免疫效果的试剂的制备、在鱼类免疫功能评价方面的应用;还提供了杂交瘤细胞株;草鱼IgM单克隆抗体可以提高血清抗体检测过程的灵敏度,具有良好的应用前景。
Description
技术领域
本发明涉及一种草鱼IgM单克隆抗体、其制备方法及其应用,属于生物工 程技术领域。
背景技术
真骨鱼血清中免疫球蛋白(Immunoglobulin,Ig)主要以四聚体IgM的形式 存在。IgM分子量约100KDa,其中重链大小为75KDa,轻链大小为25KDa。在Ig M抗体制备中,利用商品化Protein A/G亲和层析时,Protein A/G对IgM的结 合效率较低,较难纯化出IgM,因此有必要以人工的方式获得IgM单克隆抗体。 而以鱼类的IgM单克隆抗体为基础,通过分析可以评价鱼类的免疫功能、利用 鱼类血液、免疫器官和组织中抗体水平变化规律来评价疫苗免疫效果的方法、 对于治疗药物的效果研究等。此外,针对目前市场针对鱼类血清抗体的检测, 现有的检测法是以病毒重组蛋白作为固相包被物、以HRP标记的IgM抗体作为 检测抗体建立的间接ELISA检测法,应用这一方法反复测试发现,ELISA检测 P/N值较小,对样品检测的分辨率较低。
发明内容
为了克服现有技术的不足,本发明的第一个目的在于提供一种草鱼(Ctenopharyngodon idellus)IgM单克隆抗体,分类命名为杂交瘤细胞Carp IgM单抗, 可以提高血清抗体检测过程的灵敏度。
本发明的第二个目的在于提供上述草鱼IgM单克隆抗体的制备方法。
本发明的第三个目的在于提供一种草鱼IgM单克隆抗体的应用
本发明的第四个目的在于提供一种杂交瘤细胞株。
实现本发明的第一个目的可以通过采取如下技术方案达到:一种草鱼IgM 单克隆抗体,所述草鱼IgM单克隆抗体由杂交瘤细胞株产生;杂交瘤细胞株由 中国典型培养物保藏中心进行保藏,地址为:中国武汉大学,保藏日期为:201 7年8月18日,保藏号为CCTCCNO:C2017130。
实现本发明的第二个目的可以通过采取如下技术方案达到:一种草鱼IgM 单克隆抗体的制备方法,包括:
培养步骤:培养保藏号为CCTCC NO:C2017130的杂交瘤细胞株,使之分 泌单克隆抗体;
纯化步骤:将单克隆抗体纯化。
实现本发明的第三个目的可以通过采取至少一个如下技术方案的达到:
一种草鱼IgM单克隆抗体的应用,将草鱼IgM单克隆抗体应用于检测鱼类 Ig水平的试剂或试剂盒的制备。
进一步地,所述试剂或试剂盒以草鱼IgM单克隆抗体作为固相包被物,以 HRP标记的病毒蛋白作为检测抗原。
一种草鱼IgM单克隆抗体的应用,将草鱼IgM单克隆抗体应用于治疗鱼类 病毒感染的药物的制备。
一种草鱼IgM单克隆抗体的应用,将草鱼IgM单克隆抗体应用于评价鱼类 疫苗免疫效果的试剂的制备。
一种草鱼IgM单克隆抗体的应用,草鱼IgM单克隆抗体在鱼类免疫功能评 价方面的应用。
进一步地,所述免疫功能评价为草鱼对草鱼呼肠孤病毒II型的免疫功能评 价或大口黑鲈对大口黑鲈病毒的免疫功能评价。
进一步地,鱼类免疫功能评价包括:
包被步骤:用包被液将草鱼IgM单克隆抗体稀释至浓度为1-3μg/mL,包被 聚苯乙烯反应板;包被液为浓度0.05mol/L、pH为9.6的碳酸盐缓冲液;
封闭步骤:在反应板的反应孔中加入无蛋白封闭液;
样本加入步骤:反应孔中加入稀释的血清样本,再加入洗涤液进行洗涤, 拍干;洗涤液为pH为7.4、含0.05vt%Tween-20的PBS溶液;
检测抗原加入步骤:稀释HRP标记的病毒蛋白后加入反应孔,用洗涤液洗 涤,拍干;
显色步骤:加入TMB显色液进行避光显色;
终止步骤:加入终止液,读取OD450nm值;终止液为2mol/L的H2SO4溶液。
该方法有别于常规技术中先包被抗原,加入样品后再加入HRP标记单克隆 抗体的步骤,以草鱼IgM单克隆抗体结合ELISA检测方法的改进,大大提高检 测的灵敏度。
实现本发明的第四个目的可以通过采取至少一个如下技术方案的达到:一 种杂交瘤细胞株,该杂交瘤细胞株产生草鱼IgM单克隆抗体,其保藏号为CCT CC NO:C2017130。
本发明中的鱼类包括但不限于草鱼和大口黑鲈(Micropterus salmoides)。
相比现有技术,本发明的有益效果在于:
本发明的草鱼IgM单克隆抗体可以提高血清抗体检测过程的灵敏度;
本发明在草鱼IgM单克隆抗体的应用中,以草鱼IgM单克隆抗体作为固相 包被物,以HRP标记的病毒蛋白作为检测抗原,与常规技术中使用HRP标记的 IgM单克隆抗体作为检测抗体相反,针对性地设计草鱼IgM单克隆抗体的使用 方式,大大提高检测过程的灵敏性。
附图说明
图1为实施例3Western-Blot结果。
杂交瘤细胞株由中国典型培养物保藏中心进行保藏,地址为:中国武汉大 学,保藏日期为:2017年8月18日,保藏号为CCTCC NO:C2017130,分类 命名为杂交瘤细胞CarpIgM单抗。
具体实施方式
下面,结合附图以及具体实施方式,对本发明做进一步描述:
实施例1:杂交瘤细胞株的获得过程:
1)多肽合成与偶联:
以草鱼IgM重链区氨基酸序列ABD76396(序列如SEQ ID NO.1所示)为 基础,筛选出3条多肽序列:CIgM-HC1,其序列如SEQ ID NO.2所示;CIgM -HC2,其序列如SEQ ID NO.3所示;CIgM-HC3,其序列如SEQ ID NO.4所 示;
根据3条多肽的序列进行人工合成及纯化;人工合成过程中,分别在CIgM -HC2的羧基端、CIgM-HC3的氨基端加一个半胱氨酸(Cys);在多肽不同位置 中加入半胱氨酸是在不影响多肽结构的情况下提供KLH的偶联位点;
以多肽偶联试剂盒对3条多肽分别与载体蛋白KLH偶联。
2)杂交瘤细胞株的获得:
偶联KLH的3条多肽分别免疫Balb/C小鼠,背部皮下注射,150μg/只; 每隔15天检测抗体效价;每组选择草鱼IgM抗体效价高的小鼠,取脾脏细胞, 与适量的小鼠骨髓瘤细胞进行融合,每只小鼠融合10块96孔板进行克隆筛选 实验;
分别用纯化的草鱼IgM包被ELISA板,对融合的细胞上清进行ELISA筛选, 挑选阳性克隆扩大到24孔细胞培养内进行培养,每个克隆进行3轮亚克隆,以 确保细胞株分泌抗体的稳定性;最终选择1株杂交瘤细胞株CIgM-2E7作为优选 细胞;对优选的杂交瘤细胞株CIgM-2E7扩大培养、验证,交由中国典型培养物 保藏中心收藏,保藏号为:CCTCC NO:C2017130。
实施例2:草鱼IgM单克隆抗体的获得过程:
将实施例1得到的杂交瘤细胞注射小鼠,收集小鼠腹水,免疫检测验证, 利用ProteinA/G对杂交瘤细胞分泌抗体进行纯化,纯化后的单抗为草鱼IgM单 克隆抗体(2E7)。
实施例3:草鱼IgM单克隆抗体免疫分析
分别采集草鱼、鲫鱼(Carassius auratus)、罗非鱼(Oreochromis spp)、 大口黑鲈、鲤鱼(Cyprinus carpio)和大头鲢鱼(Hypophthalmichthys molitrix) 全血,分离制备血清,利用饱和硫酸铵沉淀法分别制备6种鱼IgM:配制4.1mo l/L硫酸铵溶液,在搅拌的条件下加入等体积、离心处理后的鱼血清中,4℃搅拌 6-8h,4℃8000-10000Xg离心10min,弃上清;将沉淀溶于1/2原血清体积的P BS中,4℃、在透析卡中透析12-24h,取溶解透析后的溶液,BCA法分别测定 各种鱼IgM浓度。
1)Western-Blot检测:
将6种鱼血清分别20倍稀释,以各稀释液为样品进行SDS-PAGE,以实施 例2得到的草鱼IgM单克隆抗体为识别抗体,HRP标记的羊抗鼠单克隆抗体为 二抗进行Western-Blot,结果如图1所示,图1中M:蛋白Ladder;泳道1:草 鱼IgM;泳道2:鲫鱼IgM;泳道3:罗非鱼IgM;泳道4:大口黑鲈IgM;泳 道5:鲤鱼IgM;泳道6:大头鲢鱼IgM;草鱼IgM单克隆抗体可分别识别草鱼 IgM,大口黑鲈IgM。
2)ELISA检测:
将6种鱼血清稀释至0.2μg/mL,分别包被聚苯乙烯板、封闭,分别加入2 000、4000和8000倍稀释的实施例2得到的草鱼IgM单克隆抗体,孵育、洗涤, 加入HRP标记的羊抗鼠单克隆抗体,孵育、洗涤、显色,在酶标仪中读取检测 的OD450nm。结果如表格1所示,草鱼IgM单克隆抗体具有对草鱼IgM较高的 识别效价,此外,单抗对大口黑鲈IgM同样具有明显的识别作用。
表格1 6种鱼IgM ELISA试验OD450nm均值
后续可进行更多鱼类品种的血清进行免疫分析。
实施例4:草鱼呼肠孤病毒II型(GCRV II)血清抗体的检测
1)优化试验:
以草鱼IgM单克隆抗体(2E7)作为固相包被物,以HRP标记的草鱼呼肠 孤病毒II(GCRV II)VP7重组蛋白作为检测抗原。
包被步骤:用包被液将草鱼IgM单克隆抗体稀释1.5μg/mL,包被聚苯乙烯 反应板,100μL/孔,37℃、1h后,4℃、6-8h;包被液为浓度0.05mol/L、pH为 9.6的碳酸盐缓冲液;
封闭步骤:在反应板的反应孔中加入无蛋白封闭液(Pierce),100μL/孔, 37℃、1h;
样本加入步骤:反应孔中加入不同比例稀释的阳性和阴性血清,100μL/孔, 室温、60min;加入洗涤液250μL/孔进行洗涤3次,拍干;洗涤液为pH为7.4、 含0.05vt%Tween-20的PBS溶液;
检测抗原加入步骤:HRP标记的GCRV II VP7重组蛋白稀释至2μg/mL后 加入反应孔,100μL/孔,室温、30min,加洗涤液250μL/孔进行洗涤3次,拍干;
显色步骤:加入TMB显色液(生工生物工程(上海)股份有限公司)100μL/ 孔,进行避光显色10min;
终止步骤:加入终止液50μL/孔,10min内在酶标仪上读取OD450nm值;终 止液为2mol/L的H2SO4溶液。
2)对比试验:
以草鱼呼肠孤病毒II(GCRV II)VP7重组蛋白作为固相包被物,以HRP 标记的草鱼IgM单克隆抗体(2E7)作为检测抗体。
包被步骤:用包被液将GCRV II VP7重组蛋白稀释2μg/mL,包被聚苯乙 烯反应板,100μL/孔,37℃、1h后,4℃、6-8h;包被液为浓度0.05mol/L、pH 为9.6的碳酸盐缓冲液;
封闭步骤:在反应板的反应孔中加入无蛋白封闭液(Pierce),100μL/孔, 37℃、1h;
样本加入步骤:反应孔中加入不同比例稀释的阳性和阴性血清,100μL/孔, 室温、60min;加入洗涤液250μL/孔进行洗涤3次,拍干;洗涤液为pH为7.4、 含0.05vt%Tween-20的PBS溶液;
检测抗原加入步骤:HRP标记的草鱼IgM单克隆抗体稀释至2μg/mL后加 入反应孔,100μL/孔,室温、30min,加洗涤液250μL/孔进行洗涤3次,拍干;
显色步骤:加入TMB显色液(生工生物工程(上海)股份有限公司)100μL/ 孔,进行避光显色10min;
终止步骤:加入终止液50μL/孔,10min内在酶标仪上读取OD450nm值;终 止液为2mol/L的H2SO4溶液。
结果如表格2和3所示:
表格2OD450nm均值的检测结果
表格3P/N值数据对比
优化试验和对比试验ELISA检测法对标准阴性和阳性血清进行检测,优化 试验的方法检测的P/N值最高为15.37,对比试验最高为6.15。在间接ELISA方 法建立中,常常要求较高的P/N值,即阳性标准和和阴性标准品的差距较大, 在样品检测时具有较高的分辨率。
实施例5:大口黑鲈虹彩病毒(LMBV)血清抗体的检测
1)优化试验:
以分离培养并纯化的大口黑鲈虹彩病毒(LMBV)作为固相包被物,以HR P标记的草鱼IgM单克隆抗体(2E7)作为检测抗体。
包被步骤:将LMBV稀释8μg/mL,包被聚苯乙烯反应板,100μL/孔,37℃、 1h后,4℃、6-8h;包被液为浓度0.05mol/L、pH为9.6的碳酸盐缓冲液;
封闭步骤:在反应板的反应孔中加入无蛋白封闭液(Pierce),100μL/孔, 37℃、1h;
样本加入步骤:反应孔中加入不同40倍稀释的阳性和阴性血清,100μL/孔, 室温、60min;加入洗涤液250μL/孔进行洗涤3次,拍干;洗涤液为pH为7.4、 含0.05vt%Tween-20的PBS溶液;
检测抗原加入步骤:HRP标记的草鱼IgM单克隆抗体稀释至4μg/mL后加 入反应孔,100μL/孔,室温、30min,加洗涤液250μL/孔进行洗涤3次,拍干;
显色步骤:加入TMB显色液(生工生物工程(上海)股份有限公司)100μL/ 孔,进行避光显色10min;
终止步骤:加入终止液50μL/孔,10min内在酶标仪上读取OD450nm值;终 止液为2mol/L的H2SO4溶液。
判定实验有效的条件:如果(Pm-Nm)≥0.30,同时Nm≤0.15,则实验 有效,否则实验失败,应重做。(Pm:LMBV阳性对照OD的平均值;Nm:L MBV阴性对照OD的平均值)
检测样品结果判定:
1)LMBV抗体的阳性或阴性通过计算Cut-off值(COV)进行判定。 Cut-off值(COV)的计算:COV=Nm×2.1(阴性对照孔OD值<0.08时按0.0 8计算)
例如:如果阴性对照两孔平均值Nm=0.11,则COV=Nm×2.1=0.11×2.1=0.231如果阴性对照两孔平均值Nm=0.07,则COV=Nm×2.1=0.08×2.1=0.168。
2)检测样品LMBV抗体判定标准。
样本OD值≥1.0×COV值时,判定为LMBV抗体阳性(+)。
样本OD值≤1.0×COV值时,样品判定为LMBV抗体阴性(-)。
检测结果如表格4所示:
表格4样品检测OD450nm均值及判定
根据有效性判断方法,(Pm-Nm)≥0.30,试验结果有效。COV=0.184, 在两个池塘采集样品中,无LMBV发病池塘样本中,1/11个样本为LMBV抗体 阳性;LMBV发病池塘样本中,7/11个样本为LMBV抗体阳性。
对池塘鲈鱼血清样本LMBV抗体检测可为病毒感染情况评估、大口黑鲈对 大口黑鲈病毒的免疫功能评价提供重要依据。
对于本领域的技术人员来说,可根据以上描述的技术方案以及构思,做出 其它各种相应的改变以及变形,而所有的这些改变以及变形都应该属于本发明 权利要求的保护范围之内。
SEQUENCE LISTING
<110> 广东海大畜牧兽医研究院有限公司
<120> 一种草鱼IgM单克隆抗体、其制备方法及其应用
<130> 2018
<160> 4
<170> PatentIn version 3.3
<210> 1
<211> 446
<212> PRT
<213> Ctenopharyngodon idellus
<400> 1
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Claims (10)
1.一种草鱼(Ctenopharyngodon idellus)IgM单克隆抗体,其特征在于,所述草鱼IgM单克隆抗体由保藏号为CCTCC NO:C2017130的杂交瘤细胞株产生。
2.一种草鱼IgM单克隆抗体的制备方法,其特征在于,包括:
培养步骤:培养保藏号为CCTCC NO:C2017130的杂交瘤细胞株,使之分泌单克隆抗体;
纯化步骤:将单克隆抗体纯化。
3.一种草鱼IgM单克隆抗体的应用,其特征在于,将草鱼IgM单克隆抗体应用于检测鱼类Ig水平的试剂或试剂盒的制备。
4.如权利要求3所述的草鱼IgM单克隆抗体的应用,其特征在于,所述试剂或试剂盒以草鱼IgM单克隆抗体作为固相包被物,以HRP标记的病毒蛋白作为检测抗原。
5.一种草鱼IgM单克隆抗体的应用,其特征在于,将草鱼IgM单克隆抗体应用于治疗鱼类病毒感染的药物的制备。
6.一种草鱼IgM单克隆抗体的应用,其特征在于,将草鱼IgM单克隆抗体应用于评价鱼类疫苗免疫效果的试剂的制备。
7.一种草鱼IgM单克隆抗体的应用,其特征在于,草鱼IgM单克隆抗体在鱼类免疫功能评价方面的应用。
8.如权利要求7所述的草鱼IgM单克隆抗体的应用,其特征在于,所述免疫功能评价为草鱼对草鱼呼肠孤病毒II型的免疫功能评价或大口黑鲈对大口黑鲈病毒的免疫功能评价。
9.如权利要求7所述的草鱼IgM单克隆抗体的应用,其特征在于,鱼类免疫功能评价包括:
包被步骤:用包被液将草鱼IgM单克隆抗体稀释至浓度为1-3μg/mL,包被聚苯乙烯反应板;包被液为浓度0.05mol/L、pH为9.6的碳酸盐缓冲液;
封闭步骤:在反应板的反应孔中加入无蛋白封闭液;
样本加入步骤:反应孔中加入稀释的血清样本,再加入洗涤液进行洗涤,拍干;洗涤液为pH为7.4、含0.05vt%Tween-20的PBS溶液;
检测抗原加入步骤:稀释HRP标记的病毒蛋白后加入反应孔,用洗涤液洗涤,拍干;
显色步骤:加入TMB显色液进行避光显色;
终止步骤:加入终止液,读取OD450nm值;终止液为2mol/L的H2SO4溶液。
10.一种杂交瘤细胞株,其特征在于,该杂交瘤细胞株产生草鱼IgM单克隆抗体,其保藏号为CCTCC NO:C2017130。
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