CN112390890B - 一种定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法 - Google Patents
一种定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法 Download PDFInfo
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Abstract
本申请涉及一种抗体;它的重链、轻链;相应的可变域以及相应的互补决定域;以及在BA‑ELISA分析中使用该抗体作为二抗所建立的酶联免疫分析方法。
Description
本案是申请日为2020年11月06日、申请号为202011233020.5、发明名称为“一种定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法”的发明专利申请的分案申请。
技术领域
本发明属于生物技术领域,尤其涉及一种定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法。
背景技术
白介素17(IL-17)也称为CTLA-8或IL-17A,是促炎细胞因子,其刺激诸如成纤维细胞、角质细胞、上皮和内皮细胞、滑膜细胞等非免疫细胞分泌IL-6、IL-8、PGE2、MCP-1、CXCL-1和G-CSF等多种细胞因子,并且还具有诱导ICAM-1表面表达、T细胞增殖等生物学效应。IL-17A主要由一类激活的称之为Th17的CD4+T细胞产生并通过结合IL-17RA和IL-17RC的复合物而发挥作用(Toy等,2006,J.Immunol.177(11);36-39)。抗人白介素17单克隆抗体为特异性结合人白细胞介素17A(IL-17A)的IgG1κ型人源化单克隆抗体;其亲本抗体由经人IL-17A免疫的新西兰兔B细胞筛选获得,亲本兔抗经人源化改造后得到抗人白介素17单克隆抗体。
本申请中待检测的抗人白介素17单克隆抗体是江苏荃信生物医药有限公司的QX002N,该抗人白介素17单克隆抗体在中国专利文献CN108640991 B中有所描述。具体来说,过高表达的IL-17A可引起诸多炎症疾病:如IL-17A作用于巨噬细胞,DC细胞,诱发IL-1,IL-6,TNF,CRP的高表达,导致炎症反应,参与银屑病和移植排斥的病理过程;IL-17A作用于内皮细胞,诱发IL-6,MMP,凝血因子的高表达,导致血管活化,参与再灌注损伤、血栓和动脉粥样硬化的病理过程;IL-17A作用于成纤维细胞,诱发IL-6,趋化因子,生长因子,MMP的高表达,导致基质破坏,参与多发性硬化症、克罗恩病的病理过程;IL-17A作用于成骨细胞和软骨细胞,诱导RANKL、MMP、破骨细胞生成、导致骨侵蚀、软骨损伤,参与风湿性关节炎、牙周病的病理过程(N Engl J Med.2009Aug 27;361(9):888-98.Nat Rev DrugDiscov.2012Oct;11(10):763-76.Semin Arthritis Rheum.2013Oct;43(2):158-70.Trends Mol Med.2016Mar;22(3):230-41.)。IL-17A中和抗体可以抑制自身免疫性疾病患者体内高表达IL-17A,并降低重要炎症因子IL-6的产生(Chabaud M,Durand JM,BuchsN,et al.Arthritis Rheum.1999,42:963-70)。很多自身免疫疾病的动物模型实验证明,使用抗体中和IL-17A,可有效抑制炎症的病理发展(Lubberts E,Koenders MI,Oppers-Walgreen B,et al.Arthritis Rheum.,2004,50:650-659)。目前,IL-17A相关抗体药物已经被批准上市,分别是Secukinumab(IL-17A靶向抗体,SEC)用于治疗斑块银屑病、强直性脊柱炎及银屑病关节炎、Ixekizumab(IL-17A靶向抗体,IXE),用于治疗斑块银屑病及银屑病关节炎。江苏荃信生物医药有限公司开发了商品代号为QX002N的抗IL-17单克隆抗体作为药物使用。
对于药物而言,药代动力学是应用动力学原理与数学处理方法,定量描述药物在体内的动态变化规律,研究通过各种途径进入人体的药物,其吸收、分布、代谢、排泄的过程。因此药代动力学的研究将有利于评价药物的安全性和有效性。生物样品常用的分析方法包括色谱法和免疫法。色谱法灵敏度较低,试验过程繁琐,回收率不稳定。免疫法是以特异性抗原-抗体反应为基础的分析方法,是当前临床和非临床生物样品检测方法中最为常用的一种,由于抗人白介素17单克隆抗体是蛋白大分子,适合使用酶联免疫分析方法进行测定,而且生物素化兔抗抗人白介素17单克隆抗体作为第二抗体与检测抗体的结合使用,减少血清中无关蛋白的干扰。
BA-ELISA是指是在常规ELISA原理的基础上,结合生物素(B)与亲和素(A)间的高度放大作用,而建立的一种检测系统。亲和素是卵白蛋白中提取的一种碱性糖蛋白,对生物素有非常高的亲和力(结合常数高达1015M-1)。生物素很易与蛋白质(如抗体等)以共价键结合,这样,结合了酶的亲和素分子与结合有特异性抗体的生物素分子产生反应,既起到了多级放大作用,又由于酶在遇到相应底物时的催化作用而呈色,达到检测未知抗原(或抗体)分子的目的。具有高灵敏度、高特异性和稳定性等优点。
发明内容
基于以上原因,亟待开发一种特异性强、灵敏度高的基于生物素-亲和素酶联免疫分析法的定量测定血清中抗人白介素17单克隆抗体含量的方法。
1.一种单克隆抗体,所述单克隆抗体包括重链和轻链,所述重链和轻链分别包含3个互补决定区CDR区,它们的氨基酸序列为:
重链互补决定区HCDR1区:SEQ ID NO.1:SYGMR;
重链互补决定区HCDR2区:SEQ ID NO.2:VVSSNGNIYYANWAKG;
重链互补决定区HCDR3区:SEQ ID NO.3:DLRAGWSVGPFNL;
轻链互补决定区LCDR1区:SEQ ID NO.4:QASQSIASALA;
轻链互补决定区LCDR2区:SEQ ID NO.5:DASDLAS;
轻链互补决定区LCDR3区:SEQ ID NO.6:QSYYHSGSSFYGYNG。
2.根据项1所述的单克隆抗体,所述抗体包括重链和轻链,其中,所述重链和轻链分别包括一个可变域CVR区,它们的氨基酸序列为:
重链可变域HCVR区:SEQ ID NO.7:
QSVKESGGRLVTPGGSLTLTCTVSGIDLSSYGMRWVRQAPGKGLEWIGVVSSNGNIYYANWAKGRFTISKTSTTVDLKITSLTTEDTATYFCARDLRAGWSVGPFNLWGPGTLVTVSS;
轻链可变域LCVR区:SEQ ID NO.8:
DIVMTQTPSPVSAAVGGTVTIKCQASQSIASALAWYQQKPGQPPKLLIYDASDLASGVPSRFKGSGSGTQFTLTITDLECADVATYYCQSYYHSGSSFYGYNGFGGGTEVVVK。
3.根据项2所述的单克隆抗体,所述抗体包括重链和轻链,它们的氨基酸序列为:
重链:SEQ ID NO.9:
QSVKESGGRLVTPGGSLTLTCTVSGIDLSSYGMRWVRQAPGKGLEWIGVVSSNGNIYYANWAKGRFTISKTSTTVDLKITSLTTEDTATYFCARDLRAGWSVGPFNLWGPGTLVTVSSGQPKAPSVFPLAPCCGDTPSSTVTLGCLVKGYLPEPVTVTWNSGTLTNGVRTFPSVRQSSGLYSLSSVVSVTSSSQPVTCNVAHPATNTKVDKTVAPSTCSKPTCPPPELLGGPSVFIFPPKPKDTLMISRTPEVTCVVVDVSQDDPEVQFTWYINNEQVRTARPPLREQQFNSTIRVVSTLPIAHQDWLRGKEFKCKVHNKALPAPIEKTISKARGQPLEPKVYTMGPPREELSSRSVSLTCMINGFYPSDISVEWEKNGKAEDNYKTTPAVLDSDGSYFLYSKLSVPTSEWQRGDVFTCSVMHEALHNHYTQKSISRSPGKGGGGSGLNDIFEAQKIEWHE;
轻链:SEQ ID NO.10:
DIVMTQTPSPVSAAVGGTVTIKCQASQSIASALAWYQQKPGQPPKLLIYDASDLASGVPSRFKGSGSGTQFTLTITDLECADVATYYCQSYYHSGSSFYGYNGFGGGTEVVVKGDPVAPTVLIFPPAADQVATGTVTIVCVANKYFPDVTVTWEVDGTTQTTGIENSKTPQNSADCTYNLSSTLTLTSTQYNSHKEYTCKVTQGTTSVVQSFNRGDC
4.根据项3所述的单克隆抗体,其中,所述抗体带有生物素标记。
4-1.项4所述的单克隆抗体在制备用于检测人IL-17A单克隆抗体的试剂盒中的用途。
4-2.根据项4-1所述的用途,其中,作为检测对象的抗人白介素17单克隆抗体是QX002N。
4-3.根据项4-1所述的用途,其中,所述试剂盒包括抗原和第二抗体,所述第二抗体是项4所述的单克隆抗体。
4-4.根据项4-2所述的用途,其中,所述抗原是(人)白介素17,且其被固定至固相载体上。
4-5.根据项4-4所述的用途,其特征在于,所述固相载体为酶联板。
4-6.根据项4-3所述的用途,其特征在于,所述试剂盒还包括:
辣根过氧化物酶标记的链霉亲和素;
洗液、底物显色液、终止液;
用来制作标准曲线的、已知含量的抗人白介素17单克隆抗体标准品以及相应的稀释液。
4-7.根据项4-1所述的用途,其特征在于,所述试剂盒是生物素-亲和素酶联免疫吸附测定(BA-ELISA)试剂盒。
5.一种用于检测抗人白介素17单克隆抗体的试剂盒,其中,该试剂盒包括:抗原和第二抗体;
其中,抗原是白介素17且被固定在酶联板上;而
所述第二抗体是根据权利要求4所述的单克隆抗体。
6.根据项5所述的试剂盒,其中,所述待检测的抗人白介素17单克隆抗体是QX002N;所述QX002N的
LCDR1具有SEQ ID NO:11(QASQNIGGSLA)的氨基酸序列,
LCDR2具有SEQ ID NO:12(GASSLAS)的氨基酸序列,
LCDR3具有SEQ ID NO:13(QSYNTISTYGLA)的氨基酸序列,
HCDR1具有SEQ ID NO:14(LFYMS)的氨基酸序列,
HCDR2具有SEQ ID NO:15(TIHEVASSYYASWAKG)的氨基酸序列,
HCDR3具有SEQ ID NO:16(ETYSSRYPYPNI)的氨基酸序列。
7.根据项5或6所述的试剂盒,其特征在于,所述试剂盒还包括:
辣根过氧化物酶标记的链霉亲和素;洗液、底物显色液、终止液;
用来制作标准曲线的、已知含量的抗人白介素17单克隆抗体标准品以及相应的稀释液。
8.根据项7所述的试剂盒,其中,
所述洗液是PBS溶液与吐温20的混合液(V/V:100/0.05),所述显色液是TMB显色液,所述终止液是纯化水与磷酸的混合液(V/V:4/1)。
9.根据项8所述的试剂盒,其特征在于,所述试剂盒是生物素-亲和素酶联免疫吸附测定(BA-ELISA)试剂盒。
10.使用根据项9所述的试剂盒依照BA-ELISA法对抗人白介素17单克隆抗体进行含量测定的方法。
11.如项10所述的单克隆抗体含量测定方法,该方法包括下述步骤:
-使用白介素17作为抗原包被酶联板;用洗液洗板;
-使已知浓度的抗人白介素17单克隆抗体标准品用所述稀释液稀释为稀释列并与包被抗原反应;温育;用洗液洗板;
-加入根据项4所述的单克隆抗体作为第二抗体;用洗液洗板;
-依次加入显色抗体;底物显色液;终止液;
-测定由上述得到的反应液在特定波长下的吸光值,制成标准曲线;
并且:
-使用白介素17作为抗原包被酶联板;用洗液洗板;
-使待测抗人白介素17单克隆抗体样品与包被抗原反应;温育;用洗液洗板;
-加入根据项4所述的单克隆抗体作为第二抗体;用洗液洗板;
-依次加入显色抗体;底物显色液;终止液;
-测定由上述得到的反应液在特定波长下的吸光值,由上面步骤得到的标准曲线计算待测抗人白介素17单克隆抗体样品的浓度。
12.如项11所述的单克隆抗体含量测定方法,其中,所述单克隆抗体样品与抗原反应时温育的条件为:室温下约110rpm、2h左右置于摇床。
13.如项11所述的单克隆抗体含量测定方法,其中,所使用的洗液、显色液和终止液分别是:PBS溶液与吐温20的混合液(V/V:100/0.05)、TMB显色液、纯化水与磷酸的混合液(V/V:4/1);而所述特定波长是450nm。
14.如项11所述的单克隆抗体含量测定方法,其中,加入显色抗体、底物后的显色条件是:室温下约110rpm避光置于摇床。
15.如项10至14的任一项所述的单克隆抗体含量测定方法,其中,所述待检测的抗人白介素17单克隆抗体是QX002N;所述QX002N的
LCDR1具有SEQ ID NO:11(QASQNIGGSLA)的氨基酸序列,
LCDR2具有SEQ ID NO:12(GASSLAS)的氨基酸序列,
LCDR3具有SEQ ID NO:13(QSYNTISTYGLA)的氨基酸序列,
HCDR1具有SEQ ID NO:14(LFYMS)的氨基酸序列,
HCDR2具有SEQ ID NO:15(TIHEVASSYYASWAKG)的氨基酸序列,
HCDR3具有SEQ ID NO:16(ETYSSRYPYPNI)的氨基酸序列。
发明的技术效果
采用本申请的技术方案,得到了下述有益效果:首先,以生物素化兔抗抗人白介素17单克隆抗体抗体为第二抗体,建立了定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法;第二,本申请所建立的方法有效定量范围很宽,为100~4000ng/ml,对抗人白介素17单克隆抗体的定量下限为100ng/ml,灵敏度高;第三,本发明所建立的方法重复性好,板间重复实验变异系数为1.7%~10.6%,小于20%;第四,本发明所建立的方法特异性好,可耐受50μg/ml的静注人免疫球蛋白和8ng/ml的人白介素17;第五,本发明可用于检测血清中抗人白介素17单克隆抗体含量,可用于临床评价抗人白介素17单克隆抗体的药代动力学特征,从而评估其安全性和有效性。
附图说明
图1为本发明中酶联免疫分析方法的示意图;
图2为方法标准曲线四参数拟合曲线图。
具体实施方案
需要说明的是,在说明书及权利要求当中使用了某些词汇来指称特定组件。本领域技术人员应可以理解,技术人员可能会用不同名词来称呼同一个组件。本说明书及权利要求并不以名词的差异来作为区分组件的方式,而是以组件在功能上的差异来作为区分的准则。如在通篇说明书及权利要求当中所提及的“包含”或“包括”为一开放式用语,故应解释成“包含但不限定于”。说明书后续描述为实施本发明的较佳实施方案,然所述描述乃以说明书的一般原则为目的,并非用以限定本发明的范围。本发明的保护范围当视所附权利要求所界定者为准。
本申请在第一方面涉及一种抗体。
在一个具体的实施方案中,提供了一种单克隆抗体,所述单克隆抗体包括重链和轻链,所述重链和轻链分别包含3个互补决定区CDR区,它们的氨基酸序列为:
重链互补决定区HCDR1区:SEQ ID NO.1:SYGMR;
重链互补决定区HCDR2区:SEQ ID NO.2:VVSSNGNIYYANWAKG;
重链互补决定区HCDR3区:SEQ ID NO.3:DLRAGWSVGPFNL;
轻链互补决定区LCDR1区:SEQ ID NO.4:QASQSIASALA;
轻链互补决定区LCDR2区:SEQ ID NO.5:DASDLAS;
轻链互补决定区LCDR3区:SEQ ID NO.6:QSYYHSGSSFYGYNG。
在本说明书的上下文中,“单克隆抗体”表示得自基本上同源的抗体的群体的抗体,即,构成所述群体的各个抗体是相同的和/或结合相同表位,单克隆抗体制品的每种单克隆抗体针对抗原上的单个决定簇。因而,术语“单克隆”指示所述抗体得自基本上同源的抗体群体的特征,并且不应解释为需要通过任何特定方法生产所述抗体。例如,要根据本发明使用的单克隆抗体可以通过多种技术来制备,所述技术包括、但不限于杂交瘤方法、重组DNA方法、噬菌体展示方法、和使用包含人免疫球蛋白基因座的全部或部分的转基因动物的方法,本文描述了这样的方法和其它示例性的制备单克隆抗体的方法。单克隆抗体在结构上包括有重链和轻链。
在本说明书的上下文中,CDR为complement determine region(互补决定区)的缩写,也称“超变区”。LCDR为轻链超变区的缩写,HCDR为重链超变区的缩写。一般地,抗体的重链和轻链均具有3个CDR,它们共同组成Ig的抗原结合部位(antigen-binding site)。在该部位,抗体在空间结构上可与抗原决定簇形成精密的互补。在下文中,在分析技术中使用本申请要求保护的单克隆抗体作为“二抗”或“抗抗体”与抗人白介素17单克隆抗体发生特异性结合,即是依赖此处限定的CDR区对抗人白介素17单克隆抗体上特定抗原决定簇的特异结合能力。
在又一具体实施方案中,提供了一种单克隆抗体,所述单克隆抗体包括重链和轻链,其中,所述重链和轻链分别包括一个可变域CVR区,它们的氨基酸序列为:
重链可变域HCVR区:SEQ ID NO.7:
QSVKESGGRLVTPGGSLTLTCTVSGIDLSSYGMRWVRQAPGKGLEWIGVVSSNGNIYYANWAKGRFTISKTSTTVDLKITSLTTEDTATYFCARDLRAGWSVGPFNLWGPGTLVTVSS;
轻链可变域LCVR区:SEQ ID NO.8:
DIVMTQTPSPVSAAVGGTVTIKCQASQSIASALAWYQQKPGQPPKLLIYDASDLASGVPSRFKGSGSGTQFTLTITDLECADVATYYCQSYYHSGSSFYGYNGFGGGTEVVVK。
在本说明书的上下文中,CVR是“可变域”的英文缩写,该定义是相对“恒定域”而言。重链和轻链的可变域都包括三个上述“互补决定区”。
在再一具体实施方案中,提供了一种单克隆抗体,所述单克隆抗体包括重链和轻链,它们的氨基酸序列为:
重链:SEQ ID NO.9:
QSVKESGGRLVTPGGSLTLTCTVSGIDLSSYGMRWVRQAPGKGLEWIGVVSSNGNIYYANWAKGRFTISKTSTTVDLKITSLTTEDTATYFCARDLRAGWSVGPFNLWGPGTLVTVSSGQPKAPSVFPLAPCCGDTPSSTVTLGCLVKGYLPEPVTVTWNSGTLTNGVRTFPSVRQSSGLYSLSSVVSVTSSSQPVTCNVAHPATNTKVDKTVAPSTCSKPTCPPPELLGGPSVFIFPPKPKDTLMISRTPEVTCVVVDVSQDDPEVQFTWYINNEQVRTARPPLREQQFNSTIRVVSTLPIAHQDWLRGKEFKCKVHNKALPAPIEKTISKARGQPLEPKVYTMGPPREELSSRSVSLTCMINGFYPSDISVEWEKNGKAEDNYKTTPAVLDSDGSYFLYSKLSVPTSEWQRGDVFTCSVMHEALHNHYTQKSISRSPGKGGGGSGLNDIFEAQKIEWHE;
轻链:SEQ ID NO.10:
DIVMTQTPSPVSAAVGGTVTIKCQASQSIASALAWYQQKPGQPPKLLIYDASDLASGVPSRFKGSGSGTQFTLTITDLECADVATYYCQSYYHSGSSFYGYNGFGGGTEVVVKGDPVAPTVLIFPPAADQVATGTVTIVCVANKYFPDVTVTWEVDGTTQTTGIENSKTPQNSADCTYNLSSTLTLTSTQYNSHKEYTCKVTQGTTSVVQSFNRGDC。
在又一具体实施方案中,提供了一种单克隆抗体,所述单克隆抗体带有生物素标记。
在本说明书的上下文中,在提及BA-ELISA技术时,BA指涉生物素-亲和素系统(Biotin-Avidin—System,BAS)。它是70年代末发展起来的一种新型生物反应放大系统。随着各种生物素衍生物的问世,BAS很快被广泛应用于医学各领域。近年大量研究证实,生物素—亲和素系统几乎可与目前研究成功的各种标记物结合。生物素与亲和素之间高亲合力的牢固结合以及多级放大效应,使BAS免疫标记和有关示踪分析更加灵敏。它已成为目前广泛用于微量抗原、抗体定性、定量检测及定位观察研究的新技术。BA-ELISA法又有进一步的细致分类,本申请的技术类型是将亲和素与酶标生物素共同形成亲和素-生物素-过氧化物酶复合物,在与生物素化的“抗抗体”接触时,将抗原-抗体反应体系与ABC标记体系连成一体,也称为ABC法。这一方法可以将微量抗原的信号放大成千上万倍,以便于检测。本申请的技术方案就是将该“生物素化的抗抗体”优中选优,进行技术改进,以得到一种性能优异的ABC法。
本申请在第二方面涉及一种试剂盒。
在一个具体实施方案中,提供了一种用于检测抗人白介素17单克隆抗体的试剂盒,其中,该试剂盒包括:抗原和第二抗体;
其中,抗原是白介素17且被固定在酶联板上;而
所述第二抗体是前述加生物素的单克隆抗体。
在又一具体实施方案中,提供了一种试剂盒,其中,所述待检测的抗人白介素17单克隆抗体是QX002N;所述QX002N的
LCDR1具有SEQ ID NO:11(QASQNIGGSLA)的氨基酸序列,
LCDR2具有SEQ ID NO:12(GASSLAS)的氨基酸序列,
LCDR3具有SEQ ID NO:13(QSYNTISTYGLA)的氨基酸序列,
HCDR1具有SEQ ID NO:14(LFYMS)的氨基酸序列,
HCDR2具有SEQ ID NO:15(TIHEVASSYYASWAKG)的氨基酸序列,
HCDR3具有SEQ ID NO:16(ETYSSRYPYPNI)的氨基酸序列。
在本说明书的上下文中,人白介素17A(Human Interleukin-17A,hIL-17A)表示一种源自人的蛋白。IL-17A是一种由Th17细胞产生的促炎性细胞因子,通过结合其受体而刺激细胞产生细胞因子,参与和促进多种由异常免疫反应介导的疾病。本申请的单克隆抗体是特异性识别IL-17A的中和性抗体,其能够与IL-17A特异性结合。
在本说明书的上下文中,“抗人IL-17A单克隆抗体”表示这样的单克隆抗体:其能够以足够的亲和力结合人白介素17A,使得所述单克隆抗体可用于鉴定/检测人白介素17A,也可以作为抗体药物使用,例如作为治疗自身免疫性疾病的药物使用。因此,在下文用本申请的试剂盒建立的BA-ELISA方法可以作为此类抗体药物的药代动力学研究的分析手段来使用。在又一具体实施方案中提供了一种试剂盒,其中,该试剂盒还包括:
辣根过氧化物酶标记的链霉亲和素;
洗液、底物显色液、终止液;
用来制作标准曲线的、已知含量的抗人白介素17单克隆抗体标准品以及相应的稀释液。
在本说明书的上下文中,“标准曲线”是指待测样品的含量与分析方法的可测量量(例如吸光度值)之间的线性关系,以借助其实现对待测样品的定量分析。
在再一具体实施方案中,提供了一种试剂盒,其中,所述洗液是PBS溶液与吐温20的混合液(V/V:100/0.05),所述显色液是TMB显色液,所述终止液是纯化水与磷酸的混合液(V/V:4/1)。
在又一具体实施方案中,提供了一种试剂盒,其中,该试剂盒是生物素-亲和素酶联免疫吸附测定(BA-ELISA)试剂盒。
本申请在第三方面涉及对单克隆抗体进行含量测定的方法。
在一个具体实施方案中,提供了:使用前述试剂盒依照BA-ELISA法对抗人白介素17单克隆抗体进行含量测定的方法。
在又一具体实施方案中,提供了:前述对抗人白介素17单克隆抗体进行含量测定的方法,其中,该方法包括下述步骤:
-使用白介素17作为抗原包被酶联板;用洗液洗板;
-使已知浓度的抗人白介素17单克隆抗体标准品用所述稀释液稀释为稀释列并与包被抗原反应;温育;用洗液洗板;
-加入前述加生物素标记的单克隆抗体作为第二抗体;用洗液洗板;
-依次加入显色抗体;底物显色液;终止液;
-测定由上述得到的反应液在特定波长下的吸光值,制成标准曲线;
并且:
-使用白介素17作为抗原包被酶联板;用洗液洗板;
-使待测抗人白介素17单克隆抗体样品与包被抗原反应;温育;用洗液洗板;
-加入前述加生物素标记的单克隆抗体作为第二抗体;用洗液洗板;
-依次加入显色抗体;底物显色液;终止液;
-测定由上述得到的反应液在特定波长下的吸光值,由上面步骤得到的标准曲线计算待测抗人白介素17单克隆抗体样品的浓度。
在再一具体实施方案中,提供了一种单克隆抗体含量测定方法,其中,所述单克隆抗体样品与抗原反应时温育的条件为:室温下约110rpm、2h左右置于摇床。
在又一具体实施方案中,提供了一种单克隆抗体含量测定方法,其中,所使用的洗液、显色液和终止液分别是PBS溶液与吐温20的混合(V/V:100/0.05)、TMB显色液、纯化水与磷酸的混合液(V/V:4/1);而特定波长是450nm。
在再一具体实施方案中,提供了一种单克隆抗体含量测定方法,其中,加入显色抗体、底物后的显色条件是:室温下约110rpm避光置于摇床。
在一个具体实施方式中,提供了一种单克隆抗体含量测定方法,其中,所述检测的抗人白介素17单克隆抗体是QX002N;所述QX002N的
LCDR1具有SEQ ID NO:11(QASQNIGGSLA)的氨基酸序列,
LCDR2具有SEQ ID NO:12(GASSLAS)的氨基酸序列,
LCDR3具有SEQ ID NO:13(QSYNTISTYGLA)的氨基酸序列,
HCDR1具有SEQ ID NO:14(LFYMS)的氨基酸序列,
HCDR2具有SEQ ID NO:15(TIHEVASSYYASWAKG)的氨基酸序列,
HCDR3具有SEQ ID NO:16(ETYSSRYPYPNI)的氨基酸序列。
根据本申请所建立的BA-ELISA方法可以参见图1。
<实施例>
下面将参照附图更详细地描述本发明的具体实施例。虽然附图中显示了本发明的具体实施例,然而应当理解,可以以各种形式实现本发明而不应被这里阐述的实施例所限制。相反,提供这些实施例是为了能够更透彻地理解本发明,并且能够将本发明的范围完整的传达给本领域的技术人员。
实施例1生物素标记的第二抗体的制备与纯化
用抗人白介素17单克隆抗体(F(ab)2)作为抗原进行兔子免疫,通过B细胞克隆技术筛选出能够与该单克隆抗体结合、不阻断抗人白介素17单克隆抗体与其靶点人白介素17结合、且不和同型其它人IgG发生交叉反应的非中和性兔单克隆抗体。
获得上述抗抗体轻/重链基因片段和序列信息后,首先,设计并合成含Avi-Tag基因序列的3’端引物;然后利用PCR方法,扩增获得3’端含Avi-Tag序列的重链基因;通过一步克隆法,将含Avi-Tag的重链基因插入表达质粒中,构建含Avi-Tag的重链表达质粒;接着将含Avi-Tag的重链表达质粒和轻链表达质粒共转染ExpiCHO-S细胞,表达8天后收样,利用ProteinA亲和层析纯化获得重链C端融合Avi-Tag的抗体。由于BirA酶能有效、特异地将生物素标记到Avi-Tag上,因此利用BirA酶将生物素标记到Avi-Tag上,从而获得生物素定点标记抗体。
实施例2对由实施例1制成的单克隆抗体进行性能鉴定
1、结合活性鉴定
使用抗人白介素17单克隆抗体和人IgG作为抗原包被酶联板;使系列稀释的实施例1中的单克隆抗体与包被抗原反应;依次加入显色抗体;底物显色液;终止液;进行结合活性实验。结果显示,该单克隆抗体与抗人白介素17单克隆抗体有较好结合活性,且与同型IgG不发生交叉反应。
2、中和活性鉴定
使用人白介素17作为抗原包被酶联板;将定量抗人白介素17单克隆抗体和系列稀释的实施例1中的单克隆抗体的孵育物加入与包被抗原反应;依次加入显色抗体;底物显色液;终止液;进行中和活性实验。结果显示,该单克隆抗体不阻断抗人白介素17单克隆抗体和其靶点人白介素17的结合,因此不具备中和活性。
3、生物素标记鉴定
使用抗人白介素17单克隆抗体作为抗原包被酶联板;使系列稀释的实施例1中的单克隆抗体与包被抗原反应;依次加入显色抗体;底物显色液;终止液;进行活性实验。结果显示,该单克隆抗体与抗人白介素17单克隆抗体有较好结合活性,OD值响应高,生物素标记效果好。
实施例3使用依实施例1制得的“二抗”构建Elisa试剂盒
抗原是白介素17且被固定在酶联板上;抗人白介素17单克隆抗体可以与包被抗原结合;实施例1制得的“二抗”作为第二抗体;辣根过氧化物酶标记的链霉亲和素作为显色抗体。
实验过程:
包被:人白介素17用1×PBS稀释至1μg/ml,100μl/孔,2-8℃包被过夜;
封闭:200μl/孔封闭液,室温封闭2h;
加样:标准品和质控品加样前统一用稀释液进行MRD稀释20倍;100μl/孔,室温温育2h;
加二抗:用稀释液加实施例1制得的“二抗”稀释至10ng/ml,100μl/孔,室温避光孵育90min;
加显色抗体:用稀释液将辣根过氧化物酶标记的链霉亲和素稀释至12.5ng/ml,室温避光孵育1h;
显色:100μl/孔加入TMB显色液,室温避光25min;
终止及读数:100μl/孔加入终止液;在450nm处读取OD值(以650nm作为参考)
试剂信息:
1×PBS:23.48gPBS粉末溶解于2000ml超纯水中;
清洗液:每1000ml1×PBS加入500μl Tween 20;
稀释液/封闭液:称取2.5g BSA,用1×PBS 500ml使其溶解,加入250μl Tween 20及250μl Proclin 300,充分混匀;
TMB显色液的配制:取等体积的A液和B液,冷却至室温后充分混匀即可使用,避光,现配现用;
终止液:100ml H3PO4,加到400ml超纯水中;
人混合血清:20个个体空白血清等体积混匀;
5%人混合血清稀释液:每1ml稀释液中加入50μl人混合血清。
实施例4定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法的建立
1、定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法标准曲线的建立
将抗人白介素17单克隆抗体用人混合血清稀释成39.1,78.2,156.3,312.5,625,1250,2500,4000,5000ng/ml,在确定的最佳实验条件下进行酶联免疫分析实验。以检测抗人白介素17单克隆抗体浓度为横坐标,OD450值为纵坐标绘制四参数曲线,如图2所示,发现抗人白介素17单克隆抗体浓度在78.2~4000ng/ml范围内,曲线具有较好的回收率。
结果见下表1,表明本发明建立的酶联免疫分析方法的标曲浓度为39.1(锚定点),78.2(LLOQ),156.3,312.5,625,1250,2500,4000(ULOQ),5000ng/ml(锚定点)。方法定量范围为100~4000ng/ml,39.1,5000ng/ml作为锚定点用于改善标曲的拟合(回收率不做要求)。所建立的标准曲线可以参见图2。
表1:方法标曲建立各浓度点回收率统计
注:*标记为锚定点,回收率不作要求
2、定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法的方法学研究
2.1定量范围
不同实验人员于不同天用建立的定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法评估5个独立批次的标准曲线。
结果如表2所示,除锚定点外,在LLOQ和ULOQ浓度水平:批间准确度RE%在-4.9%~1.7%范围内,精密度CV%在1.7~10.6%范围内。4000ng/mL和100ng/mL可作为方法的定量上限和定量下限。
表2:方法定量范围研究
2.2准确度和精密度
实验人员至少2天用建立的定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法评估5个独立批次的质控样品(包括LLOQ、LQC、MQC、HQC、ULOQ)。
结果如表3所示,在LLOQ和ULOQ浓度水平:批间准确度RE%在1.1%~5.9%范围内,精密度CV%在8.0%~8.5%范围内。在QC浓度水平:批间准确度RE%在-8.1%~-0.2%范围内,精密度CV%在6.6%~7.9%范围内。
表3:方法准确度和精密度研究
2.3选择性
用建立的定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法,通过向至少10个个体来源的空白基质,添加LLOQ浓度水平的抗人白介素17单克隆抗体来考察。
结果如表4所示,12个个体来源的空白样品响应值均低于LLOQ,11个个体来源LLOQ水平质控样品批内准确度RE%在8.1%~22.6%范围内。
表4:方法选择性研究
2.4稀释线性和钩状效应
用建立的定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法,分别配制1000000、100000、25000和2500ng/ml浓度样品,高于定量上限的验证样品经1000倍、100倍和10倍的稀释,分别获得浓度在1000、1000、和2500ng/mL的稀释线性验证样品,对稀释线性验证样品与钩状效应样品进行检测,每个浓度水平的验证样品包含3个样品,每个样品为复孔。
结果见表5/6,高于ULOQ的钩状效应样品回算浓度均不准确,且未出现在标曲范围内的钩状效应。稀释线性验证样品稀释1000倍、100倍和10倍后,回算浓度终浓度的准确度在4.2%~8.9%范围内、精密度≤12%。
表5:钩状效应研究
表6:稀释线性研究
2.5特异性
用建立的定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法,特异性考察了浓度为0,和200ng/ml的待测物验证样品中分别加入50000和5000ng/ml的干扰物1(静注人免疫球蛋白)以及8和1.6ng/ml的干扰物2(人白介素17)的情况下,分析分析物的浓度。每个浓度水平包括3个验证样品且为复孔。
结果如表7/8,方法特异性好,可耐受50000ng/ml的干扰物1(静注人免疫球蛋白)以及8ng/ml的干扰物2(人白介素17)。
表7:方法特异性研究
表8:方法特异性研究2
实施例5使用依实施例3构建的Elisa试剂盒依实施例4建立的方法对血清中的抗人白介素17单克隆抗体进行含量测定
使用稀释液对待测抗人白介素17单克隆抗体样品进行MRD稀释20倍,然后用5%血清稀释液进行合适倍数的稀释,以落入标曲定量范围为宜;使用依实施例3构建的Elisa试剂盒依实施例4建立的方法对血清中的抗人白介素17单克隆抗体进行含量测定。
综上所述,本发所明提供的一种定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法,是一种通过人白介素17包被酶标板形成固相载体,与待检生物样品中抗人白介素17单克隆抗体结合,再通过生物素化第二抗体和检测抗体,形成固相抗原-抗体-酶标抗体复合物。由于筛选获得的生物素化第二抗体(二抗)具有很强的特异性,所以本发明中所建立方法的特异性强,灵敏度高,具有好的精密度和准确度。
尽管以上结合附图对本发明的实施方案进行了描述,但本发明并不局限于上述的具体实施方案和应用领域,上述的具体实施方案仅仅是示意性的、指导性的,而不是限制性的。本领域的普通技术人员在本说明书的启示下和在不脱离本发明权利要求所保护的范围的情况下,还可以做出很多种的形式,这些均属于本发明保护之列。
序列表
<110>江苏荃信生物医药有限公司
<120> 一种定量检测血清中抗人白介素17单克隆抗体含量的酶联免疫分析方法
<130>PD01054D1
<141> 2020-10-21
<160> 16
<170> SIPOSequenceListing 1.0
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Ser Tyr Gly Met Arg
1 5
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<212> PRT
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Val Val Ser Ser Asn Gly Asn Ile Tyr Tyr Ala Asn Trp Ala Lys Gly
1 5 10 15
<210> 3
<211> 13
<212> PRT
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<400> 3
Asp Leu Arg Ala Gly Trp Ser Val Gly Pro Phe Asn Leu
1 5 10
<210> 4
<211> 11
<212> PRT
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<400> 4
Gln Ala Ser Gln Ser Ile Ala Ser Ala Leu Ala
1 5 10
<210> 5
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<212> PRT
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<400> 5
Asp Ala Ser Asp Leu Ala Ser
1 5
<210> 6
<211> 15
<212> PRT
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Gln Ser Tyr Tyr His Ser Gly Ser Ser Phe Tyr Gly Tyr Asn Gly
1 5 10 15
<210> 7
<211> 118
<212> PRT
<213> Artificial Sequence
<400> 7
Gln Ser Val Lys Glu Ser Gly Gly Arg Leu Val Thr Pro Gly Gly Ser
1 5 10 15
Leu Thr Leu Thr Cys Thr Val Ser Gly Ile Asp Leu Ser Ser Tyr Gly
20 25 30
Met Arg Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Ile Gly
35 40 45
Val Val Ser Ser Asn Gly Asn Ile Tyr Tyr Ala Asn Trp Ala Lys Gly
50 55 60
Arg Phe Thr Ile Ser Lys Thr Ser Thr Thr Val Asp Leu Lys Ile Thr
65 70 75 80
Ser Leu Thr Thr Glu Asp Thr Ala Thr Tyr Phe Cys Ala Arg Asp Leu
85 90 95
Arg Ala Gly Trp Ser Val Gly Pro Phe Asn Leu Trp Gly Pro Gly Thr
100 105 110
Leu Val Thr Val Ser Ser
115
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<211> 113
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<213> Artificial Sequence
<400> 8
Asp Ile Val Met Thr Gln Thr Pro Ser Pro Val Ser Ala Ala Val Gly
1 5 10 15
Gly Thr Val Thr Ile Lys Cys Gln Ala Ser Gln Ser Ile Ala Ser Ala
20 25 30
Leu Ala Trp Tyr Gln Gln Lys Pro Gly Gln Pro Pro Lys Leu Leu Ile
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50 55 60
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Lys
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Gln Ser Val Lys Glu Ser Gly Gly Arg Leu Val Thr Pro Gly Gly Ser
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Met Arg Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Ile Gly
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Val Val Ser Ser Asn Gly Asn Ile Tyr Tyr Ala Asn Trp Ala Lys Gly
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Arg Ala Gly Trp Ser Val Gly Pro Phe Asn Leu Trp Gly Pro Gly Thr
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115 120 125
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Cys Leu Val Lys Gly Tyr Leu Pro Glu Pro Val Thr Val Thr Trp Asn
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Ser Gly Thr Leu Thr Asn Gly Val Arg Thr Phe Pro Ser Val Arg Gln
165 170 175
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Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val
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Val Val Asp Val Ser Gln Asp Asp Pro Glu Val Gln Phe Thr Trp Tyr
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Ile Asn Asn Glu Gln Val Arg Thr Ala Arg Pro Pro Leu Arg Glu Gln
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Gln Phe Asn Ser Thr Ile Arg Val Val Ser Thr Leu Pro Ile Ala His
290 295 300
Gln Asp Trp Leu Arg Gly Lys Glu Phe Lys Cys Lys Val His Asn Lys
305 310 315 320
Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Arg Gly Gln
325 330 335
Pro Leu Glu Pro Lys Val Tyr Thr Met Gly Pro Pro Arg Glu Glu Leu
340 345 350
Ser Ser Arg Ser Val Ser Leu Thr Cys Met Ile Asn Gly Phe Tyr Pro
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Ser Asp Ile Ser Val Glu Trp Glu Lys Asn Gly Lys Ala Glu Asp Asn
370 375 380
Tyr Lys Thr Thr Pro Ala Val Leu Asp Ser Asp Gly Ser Tyr Phe Leu
385 390 395 400
Tyr Ser Lys Leu Ser Val Pro Thr Ser Glu Trp Gln Arg Gly Asp Val
405 410 415
Phe Thr Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln
420 425 430
Lys Ser Ile Ser Arg Ser Pro Gly Lys Gly Gly Gly Gly Ser Gly Leu
435 440 445
Asn Asp Ile Phe Glu Ala Gln Lys Ile Glu Trp His Glu
450 455 460
<210> 10
<211> 217
<212> PRT
<213> Artificial Sequence
<400> 10
Asp Ile Val Met Thr Gln Thr Pro Ser Pro Val Ser Ala Ala Val Gly
1 5 10 15
Gly Thr Val Thr Ile Lys Cys Gln Ala Ser Gln Ser Ile Ala Ser Ala
20 25 30
Leu Ala Trp Tyr Gln Gln Lys Pro Gly Gln Pro Pro Lys Leu Leu Ile
35 40 45
Tyr Asp Ala Ser Asp Leu Ala Ser Gly Val Pro Ser Arg Phe Lys Gly
50 55 60
Ser Gly Ser Gly Thr Gln Phe Thr Leu Thr Ile Thr Asp Leu Glu Cys
65 70 75 80
Ala Asp Val Ala Thr Tyr Tyr Cys Gln Ser Tyr Tyr His Ser Gly Ser
85 90 95
Ser Phe Tyr Gly Tyr Asn Gly Phe Gly Gly Gly Thr Glu Val Val Val
100 105 110
Lys Gly Asp Pro Val Ala Pro Thr Val Leu Ile Phe Pro Pro Ala Ala
115 120 125
Asp Gln Val Ala Thr Gly Thr Val Thr Ile Val Cys Val Ala Asn Lys
130 135 140
Tyr Phe Pro Asp Val Thr Val Thr Trp Glu Val Asp Gly Thr Thr Gln
145 150 155 160
Thr Thr Gly Ile Glu Asn Ser Lys Thr Pro Gln Asn Ser Ala Asp Cys
165 170 175
Thr Tyr Asn Leu Ser Ser Thr Leu Thr Leu Thr Ser Thr Gln Tyr Asn
180 185 190
Ser His Lys Glu Tyr Thr Cys Lys Val Thr Gln Gly Thr Thr Ser Val
195 200 205
Val Gln Ser Phe Asn Arg Gly Asp Cys
210 215
<210> 11
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<212> PRT
<213> Artificial Sequence
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Gln Ala Ser Gln Asn Ile Gly Gly Ser Leu Ala
1 5 10
<210> 12
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<212> PRT
<213> Artificial Sequence
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Gly Ala Ser Ser Leu Ala Ser
1 5
<210> 13
<211> 12
<212> PRT
<213> Artificial Sequence
<400> 13
Gln Ser Tyr Asn Thr Ile Ser Thr Tyr Gly Leu Ala
1 5 10
<210> 14
<211> 5
<212> PRT
<213> Artificial Sequence
<400> 14
Leu Phe Tyr Met Ser
1 5
<210> 15
<211> 16
<212> PRT
<213> Artificial Sequence
<400> 15
Thr Ile His Glu Val Ala Ser Ser Tyr Tyr Ala Ser Trp Ala Lys Gly
1 5 10 15
<210> 16
<211> 12
<212> PRT
<213> Artificial Sequence
<400> 16
Glu Thr Tyr Ser Ser Arg Tyr Pro Tyr Pro Asn Ile
1 5 10
Claims (11)
1.一种单克隆抗体,所述单克隆抗体由重链和轻链构成,所述重链和轻链中的互补决定区CDR区的氨基酸序列为:
重链互补决定区HCDR1区:SEQ ID NO.1:SYGMR;
重链互补决定区HCDR2区:SEQ ID NO.2:VVSSNGNIYYANWAKG;
重链互补决定区HCDR3区:SEQ ID NO.3:DLRAGWSVGPFNL;
轻链互补决定区LCDR1区:SEQ ID NO.4:QASQSIASALA;
轻链互补决定区LCDR2区:SEQ ID NO.5:DASDLAS;
轻链互补决定区LCDR3区:SEQ ID NO.6:QSYYHSGSSFYGYNG。
2.根据权利要求1所述的单克隆抗体,所述抗体由重链和轻链构成,其中,所述重链和轻链中的可变域CVR区的氨基酸序列为:
重链可变域HCVR区:SEQ ID NO.7:QSVKESGGRLVTPGGSLTLTCTVSGIDLSSYGMRWVRQAPGKGLEWIGVVSSNGNIYYANWAKGRFTISKTSTTVDLKITSLTTEDTATYFCARDLRAGWSVGPFNLWGPGTLVTVSS;
轻链可变域LCVR区:SEQ ID NO.8:DIVMTQTPSPVSAAVGGTVTIKCQASQSIASALAWYQQKPGQPPKLLIYDASDLASGVPSRFKGSGSGTQFTLTITDLECADVATYYCQSYYHSGSSFYGYNGFGGGTEVVVK。
3.根据权利要求2所述的单克隆抗体,所述抗体由重链和轻链构成,它们的氨基酸序列为:
重链:SEQ ID NO.9:QSVKESGGRLVTPGGSLTLTCTVSGIDLSSYGMRWVRQAPGKGLEWIGVVSSNGNIYYANWAKGRFTISKTSTTVDLKITSLTTEDTATYFCARDLRAGWSVGPFNLWGPGTLVTVSSGQPKAPSVFPLAPCCGDTPSSTVTLGCLVKGYLPEPVTVTWNSGTLTNGVRTFPSVRQSSGLYSLSSVVSVTSSSQPVTCNVAHPATNTKVDKTVAPSTCSKPTCPPPELLGGPSVFIFPPKPKDTLMISRTPEVTCVVVDVSQDDPEVQFTWYINNEQVRTARPPLREQQFNSTIRVVSTLPIAHQDWLRGKEFKCKVHNKALPAPIEKTISKARGQPLEPKVYTMGPPREELSSRSVSLTCMINGFYPSDISVEWEKNGKAEDNYKTTPAVLDSDGSYFLYSKLSVPTSEWQRGDVFTCSVMHEALHNHYTQKSISRSPGKGGGGSGLNDIFEAQKIEWHE;
轻链:SEQ ID NO.10:DIVMTQTPSPVSAAVGGTVTIKCQASQSIASALAWYQQKPGQPPKLLIYDASDLASGVPSRFKGSGSGTQFTLTITDLECADVATYYCQSYYHSGSSFYGYNGFGGGTEVVVKGDPVAPTVLIFPPAADQVATGTVTIVCVANKYFPDVTVTWEVDGTTQTTGIENSKTPQNSADCTYNLSSTLTLTSTQYNSHKEYTCKVTQGTTSVVQSFNRGDC。
4.根据权利要求3所述的单克隆抗体,其中,所述抗体带有生物素标记。
5.根据权利要求4所述的单克隆抗体在制备用于检测抗人白介素17单克隆抗体的试剂盒中的用途。
6.根据权利要求5所述的用途,其中,作为检测对象的抗人白介素17单克隆抗体是QX002N。
7.根据权利要求5所述的用途,其中,所述试剂盒包括抗原和第二抗体,所述第二抗体是权利要求4所述的单克隆抗体。
8.根据权利要求7所述的用途,其中,所述抗原是人白介素17,且其被固定至固相载体上。
9.根据权利要求8所述的用途,其特征在于,所述固相载体为酶联板。
10.根据权利要求7所述的用途,其特征在于,所述试剂盒还包括:
辣根过氧化物酶标记的链霉亲和素;
洗液、底物显色液、终止液;
用来制作标准曲线的、已知含量的抗人白介素17单克隆抗体标准品以及相应的稀释液。
11.根据权利要求5所述的用途,其特征在于,所述试剂盒是生物素-亲和素酶联免疫吸附测定(BA-ELISA)试剂盒。
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