CN112986574A - 一种用于评价lag3抗体的生物学活性的方法及其试剂盒 - Google Patents
一种用于评价lag3抗体的生物学活性的方法及其试剂盒 Download PDFInfo
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- CN112986574A CN112986574A CN201911295821.1A CN201911295821A CN112986574A CN 112986574 A CN112986574 A CN 112986574A CN 201911295821 A CN201911295821 A CN 201911295821A CN 112986574 A CN112986574 A CN 112986574A
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Abstract
本发明公开了一种用于评价LAG3抗体的生物学活性的方法及其试剂盒,涉及LAG3抗体活性检测技术领域。具体而言,该用于评价LAG3抗体的生物学活性的方法包括将表达LAG3蛋白的T淋巴瘤细胞和表达MHCII的细胞的混合产物与待评价LAG3抗体共孵育,检测孵育产物中细胞因子的表达量。该方法仅需要构建一种稳定表达LAG3蛋白的细胞株,体系构建时间短且稳定性好,能够有效检测LAG3抗体的活性。
Description
技术领域
本发明涉及LAG3抗体活性检测技术领域,具体而言,涉及一种用于评价LAG3抗体的生物学活性的方法及其试剂盒。
背景技术
LAG3(Lymphocyte Activation Gene-3,淋巴细胞活化基因3,也称作CD223)是一种I型跨膜免疫球蛋白超基因家族成员。其能与MHC II类分子(组织相容性复合物II类分子)结合,负向调节免疫反应。通过研发抑制LAG3与MHC II分子结合的LAG3抗体,可上调免疫反应,增强细胞的抗肿瘤能力。
现有技术多采用超抗原葡萄球菌肠毒素(SEB)刺激健康人PBMC分泌细胞因子,或者通过异体T-DC混合淋巴细胞反应来评价抗人LAG3(hLAG3)抗体的体外生物学活性。但这两种技术均需要采集健康人外周血以用于分离外周血淋巴细胞PBMC,或需要进一步获得诱导分化后的DC细胞及分离高纯度的T细胞,实验材料获取困难,实验流程复杂,并且因供者不同,实验稳定性较差。
目前,还可通过荧光素酶报告基因体系,通过检测LAG3蛋白下游信号途径的活化信号,以评价抗hLAG3抗体介导的MHC II类分子的阻断活性,但该方法需要花费大量的时间以构建两种细胞株,即表达LAG3蛋白的稳定细胞株和包含荧光素酶报告基因的稳定细胞株,构建周期长,过程繁琐。
鉴于此,特提出本发明。
发明内容
本发明实施例的目的在于提供了一种用于评价LAG3抗体的生物学活性的方法及其试剂盒,该方法包括将表达LAG3蛋白的T淋巴瘤细胞和表达MHC II的细胞的混合产物与待评价LAG3抗体共孵育,检测孵育产物中细胞因子的表达量。
该试剂盒包括有表达LAG3蛋白的T淋巴瘤细胞和表达MHC II的细胞。
本发明具有以下有益效果:
本发明实施例提供的用于评价LAG3抗体的生物学活性的方法,仅需要构建一种稳定表达LAG3蛋白的细胞株,体系构建时间短且稳定性好,能够有效检测LAG3抗体的活性。
附图说明
为了更清楚地说明本发明实施例的技术方案,下面将对实施例中所需要使用的附图作简单地介绍,应当理解,以下附图仅示出了本发明的某些实施例,因此不应被看作是对范围的限定,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他相关的附图。
图1为本发明实施例1中的Jurkat-hLAG3稳定细胞株上hLAG3/CD3的比值结果;
图2为本发明实施例2中Jurkat-hLAG3和Raji细胞共孵育后IL2的分泌结果;
图3为本发明实施例2中14号克隆上hLAG3和CD3的表达情况;
图4为本发明验证例1中丝裂霉素C处理Raji细胞1~3天后Raji细胞的检测结果,其中,图4A为细胞存活率检测结果,图4B为活细胞密度检测结果;
图5为本发明验证例2中加入不同外源刺激因子后IL2的检测结果;
图6为本发明验证例3中不同Jurkat细胞与Raji细胞混合比例以及不同共孵育时间下IL2的检测结果;
图7为本发明验证例4中不同的抗hLAG3抗体在评价体系中IL-2的表达情况;
图8为本发明验证例5中Jurkat-hLAG3和Raji细胞上表达PD1和PDL1的检测结果;
图9为本发明验证例5中不同抗体作用下IL2的分泌情况。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚,下面将对本发明实施例中的技术方案进行清楚、完整地描述。实施例中未注明具体条件者,按照常规条件或制造商建议的条件进行。所用试剂或仪器未注明生产厂商者,均为可以通过市售购买获得的常规产品。
本发明提供了一种用于评价LAG3抗体的生物学活性的方法,其包括:将表达LAG3蛋白的T淋巴瘤细胞细胞和表达MHC II的细胞的混合产物与待评价LAG3抗体共孵育,检测孵育产物中细胞因子的表达量。
在本发明提供的方法中,表达LAG3蛋白的T淋巴瘤细胞细胞与表达MHC II的细胞共孵育后,T淋巴瘤细胞细胞上的LAG3蛋白与MHC II结合,免疫下调,抑制T淋巴瘤细胞细胞分泌细胞因子;当在共孵育产物中加入抗LAG3抗体后,抗LAG3抗体与LAG3蛋白结合,以阻断LAG3蛋白与MHC II的结合,使T淋巴瘤细胞细胞分泌细胞因子的功能恢复,细胞因子的分泌量增加。
在可选实施方式中,所述表达LAG3蛋白的细胞与所述表达MHC II的细胞的细胞数量比为(5~20):1。具体地,所述表达LAG3蛋白的细胞与所述表达MHC II的细胞的细胞数量可比为5:1、6:1、7:1、8:1、9:1、10:1、11:1、12:1、13:1、14:1、15:1、16:1、17:1、18:1、19:1或20:1。
在可选实施方式中,所述共孵育的孵育时间为22~26h。具体地,所述共孵育的孵育时间为22h、23h、24h、25h或26h。在该混合孵育时间下,LAG3蛋白的T淋巴瘤细胞细胞分泌细胞因子的能力较强。
在可选实施方式中,所述表达LAG3蛋白的T淋巴瘤细胞中,hLAG3/hCD3的表达比为0.5~40。在该hLAG3/hCD3的表达比的范围内,人源T淋巴瘤细胞能稳定表达LAG3蛋白,使用于评价LAG3抗体的生物学活性的方法的稳定性更好,检测结果更准确。
在可选实施方式中,所述表达LAG3蛋白的T淋巴瘤细胞中,hLAG3/hCD3的表达比为0.8~1.5。具体地,hLAG3/hCD3的表达比可为0.8、0.9、1.0、1.1、1.2、1.3、1.4或1.5。
在可选实施方式中,所述表达LAG3蛋白的细胞为人源T淋巴瘤细胞系。
在可选实施方式中,所述表达LAG3蛋白的细胞为Jurkat细胞。
在可选实施方式中,所述表达MHC II的细胞为Raji细胞。
在可选实施方式中,在共孵育前,所述方法包括采用细胞增殖抑制剂处理Raji细胞1~3天。本发明采用细胞增殖抑制剂处理细胞,能够在维持细胞功能的前提下抑制Raji细胞的增殖,保持反应体系的稳定,增加检测结果的稳定性和准确度。
在可选实施方式中,所述增殖抑制剂为丝裂霉素C。
在可选实施方式中,所述丝裂霉素C的作用浓度为1~10μg/ml。
在可选实施方式中,所述丝裂霉素C的作用浓度为2.5~10μg/ml。具体地,所述丝裂霉素C的作用浓度为2.5μg/ml、3μg/ml、3.5μg/ml、4μg/ml、4.5μg/ml、5μg/ml、5.5μg/ml、6μg/ml、6.5μg/ml、7μg/ml、7.5μg/ml、8μg/ml、8.5μg/ml、9μg/ml、9.5μg/ml或10μg/ml。
在可选实施方式中,所述待评价LAG3抗体包括Relatlimab、LAG525、REGN3767、MK-4280、MGD013、Sym022、FS118和GSK2831781中的任意一种。
在可选实施方式中,细胞因子为IL2或干扰素γ,优选为IL2。
此外,本实施例还提供了用于评价LAG3抗体的生物学活性的试剂盒,其包括有表达LAG3蛋白的T淋巴瘤细胞和表达MHC II的细胞。需要说明的是,表达LAG3蛋白的T淋巴瘤细胞和表达MHC II的细胞同上述实施方式所述,在此不再赘述。
在可选实施方式中,该试剂盒还包括丝裂霉素C和/或细胞因子检测试剂。
在可选实施方式中,所述细胞因子检测试剂为IL2检测试剂。
以下结合实施例对本发明的特征和性能作进一步的详细描述。
实施例1
构建稳定表达人LAG3的Jurkat稳定细胞株。
Jurkat细胞不表达内源性的人LAG3蛋白(hLAG3),通过慢病毒体系构建稳定表达hLAG3蛋白(序列如SEQ ID No.1所示)的Jurkat稳定细胞株,即Jurkat-hLAG3,具体如下。
用含10%的DMEM完全培养基将293T细胞按5×10E6接种于100mm平皿中,于37℃、5%CO2培养箱培养过夜。次日,待293T细胞生长至汇合率为80~90%,采用聚乙烯亚胺PEI进行质粒转染,37℃、5%CO2培养箱中静置培养。
次日,将细胞上清完全吸去(第一次病毒上清),加入新鲜的DMEM完全培养基,在培养箱中继续培养48小时。吸取病毒上清后,加入新鲜的完全培养基继续培养1天后,收集上清,并将收集的上清与第一次病毒上清合并后,于4℃、3000×g离心10min后,通过0.45μm滤膜过滤浓缩。
采用流式细胞仪进行慢病毒滴MOI检测。根据MOI,采用助转剂Polybrene进行Jurkat细胞的慢病毒感染,72小时后,采用有限稀释法进行单克隆的筛选,在96孔板中连续培养15-20天后,光学显微镜下观察细胞克隆化情况,然后转移至24孔板中扩大培养,根据细胞生长情况,挑选单克隆化细胞转移至6孔板中,待单克隆细胞生长3天后,采用流式细胞术检测CD3和LAG3的表达,并对挑选出的部分Jurkat-hLAG3细胞株进行传代稳定性评估。
筛选获得的38株Jurkat-hLAG3稳定细胞株上hLAG3/CD3的比值结果如图1所示,hLAG3/hCD3的表达比例介于0.5~40之间,选取hCD3/hLAG3比值介于0.8~3的克隆。
实施例2
Jurkat-hLAG3稳定细胞株的传代稳定性评估。
为防止外源人LAG3基因整合后的丢失,对实施例1得到的部分Jurkat-hLAG3克隆进行稳定性评估。
通过Jurkat-hLAG3和Raji细胞混合培养体系,检测细胞因子IL2的分泌情况:
将5μg/ml CD3抗体包被于96孔板中,次日,按1×10E4/孔Raji细胞,2×10E5/孔Jurkat-hLAG3细胞进行共孵育,37℃连续培养3天后,采用酶联免疫反应ELISA检测上清中IL2的表达,检测结果如图2所示。
由图2可知,相对#34、#35、#87和#95号克隆外,#14号克隆Jurkat-hLAG3几乎没有IL2的分泌,加入Raji细胞后,IL2的分泌量显著上调,说明#14细胞能够明显的评价LAG3抗体的生物学活性。同时,通过流式细胞仪,检测传代过程中不同代次下#14号克隆上LAG3和CD3的表达情况,如图3所示,不同传代下,#14号克隆Jurkat-hLAG3上LAG3与CD3的表达比例介于0.8~1.5之间。
实施例3
评价LAG3抗体的生物学活性的方法。
用1ml含10%FBS的RPMI 1640完全培养基重悬Raji细胞至活细胞密度为5×10E6/ml,在Raji细胞中加入丝裂霉素C至终浓度为2.5μg/ml,37℃细胞培养箱静置处理30min。补加DPBS至10ml,250×g离心5min后,吸弃上清后,用DPBS再次洗涤细胞一次。
最后,细胞完全培养基重悬Raji细胞至活细胞浓度为2×10E5/ml。取Jurkat-hLAG3#14(实施例2提供的)细胞液,250×g离心5min后,调整活细胞浓度至1×10E6/ml。
将Raji细胞和Jurkat-hLAG3#14细胞按等体积混匀后,按100μL/孔均分至96孔平底板中。用细胞完全培养基稀释抗hLAG3抗体至所需浓度。按100μL/孔均分至96孔平底板中。将96孔板转移至37℃,5%CO2细胞培养箱中,培养1天。
收集细胞上清,用Human IL-2,uncoated ELISA kit(eBioscience,Cat.88-7025)进行IL-2的定量检测。
验证例1
验证丝裂霉素C的浓度对于Raji细胞的影响。
采用实施例3提供的方法,并设置6组试验例(试验例1~6),试验例1~6分别采用不同作用浓度的丝裂霉素C处理Raji细胞,丝裂霉素C处理浓度分别为10μg/ml、7.5μg/ml、5μg/ml、2.5μg/ml、1μg/ml以及0μg/ml。丝裂霉素C处理Raji细胞1~3天后,检测细胞活性,检测结果如图4所示。
图4A为不同浓度下,细胞存活率检测结果,图4B为不同浓度下,活细胞密度检测结果。
由图4A和4B可知,当丝裂霉素C的作用浓度为2.5μg/ml时,经处理1~3天后的Raji细胞活率不受影响,同时能以最小丝裂霉素浓度抑制Raji细胞的生长。
验证例2
验证外源刺激因子对评价LAG3抗体的生物学活性的方法的影响。
采用实施例3提供的方法,设置5组试验例(试验例1~5),试验例1~4的区别条件在于分别依次采用5μg/ml、1μg/ml、0.5μg/ml以及0μg/ml OKT3(外源刺激因子)提前包被平板,试验例5为实验当天加入葡萄球菌肠毒素SEB。
5组试验例均对照设置有人IgG4抗体对照组(human IgG4 iso ctrl组)和空白对照组(Blank ctrl组),检测各试验例中LAG3抗体Relatlimab促进Jurkat-hLAG3分泌IL2的情况,检测结果如图5所示。
由图5可知,在不进行OKT3或SEB刺激的条件下,Jurkat-hLAG3经Raji细胞处理,并加入抗LAG3抗体Relatlimab后,能恢复分泌相当或更多的细胞因子IL-2,因此,实施例3提供的方法不需要外源刺激因子的加入。
验证例3
验证Jurkat细胞与Raji细胞混合比例以及共孵育时间对评价LAG3抗体的生物学活性的方法的影响。
采用实施例3提供的方法,对照设置5组试验例,5组试验例的区别条件在于Jurkat-hLAG3和Raji细胞的细胞数量比依次为1:40、1:20、1:10、1:5以及1:2,每组试验例对照设置2组对照组(human IgG4 iso ctrl组和Blank ctrl组)。检测Jurkat-hLAG3、Raji细胞以及Relatlimab共孵育1天、2天和3天后评价体系中的IL2分泌结果,检测结果如图6所示。
由图6可知,IL-2在孵育1天后分泌量相对孵育2天或3天较高;当Jurkat-hLAG3细胞和Raji细胞的混合比例为5:1时,相对其他混合比例,IL2分泌量相对较高,同时检测到加入抗LAG3抗体Relatlimab介导的刺激Jurkat-hLAG3恢复IL2分泌的能力显著。
验证例4
验证评价LAG3抗体的生物学活性的方法的可行性。
选择6个抗hLAG3抗体采用实施例3提供的方法进行抗体活性评价,分别检测IL2的表达量,检测结果如图7所示。
由图7可知,不同的抗hLAG3抗体在该体系中IL-2的表达量不同。该体系可用于抗hLAG3抗体体外活性的评价。
验证例5
验证评价LAG3抗体的生物学活性的方法的特异性。
采用流式分析术,检测Jurkat-hLAG3和Raji细胞上PD1和PDL1的表达,结果如图8所示,Jurkat-hLAG3和Raji细胞上均有PD1和PDL1的表达。
本实施例采用实施例3提供的方法,设置8组试验例,8组试验例的区别在于待评价抗体不同,区别如下:
试验例1:10μg/ml人LAG3抗体(Relatlimab);
试验例2:10μg/ml Opdivo(抗hPD1抗体);
试验例3:0.1μg/ml Opdivo;
试验例4:10μg/ml hIgG4 iso;
试验例5:No Ab(空白对照);
试验例6:10μg/ml Relatlimab+1μg/ml Opdivo;
试验例7:10μg/ml hlG4 iso+1μg/ml Opdivo;
试验例8:No Ab+1μg/ml Opdivo;
检测8组试验例的IL-2的分泌情况,检测结果如图9所示。由图9可知,仅用Relatlimab作用时,Jurkat-hLAG3细胞有增加IL-2的分泌量,说明该体系仅适用用于抗hLAG3抗体的体外活性评价。
综上,本发明实施例提供了一种表达LAG3蛋白的细胞和用于评价LAG3抗体活性的试剂盒及其方法,该用于评价LAG3抗体活性的方法包括将上述表达LAG3蛋白的细胞与表达MHC II的细胞混合,作为评价体系,通过检测评价体系中分泌的细胞因子的量来鉴定待评价LAG3抗体的生物学活性,该体系具有稳定性好,构建周期短,过程简单等优点。
以上所述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
SEQUENCE LISTING
<110> 深圳市菲鹏生物制药股份有限公司
<120> 一种用于评价LAG3抗体的生物学活性的方法及其试剂盒
<130> 250
<160> 1
<170> PatentIn version 3.5
<210> 1
<211> 525
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Claims (10)
1.一种用于评价LAG3抗体的生物学活性的方法,其特征在于,其包括:将表达LAG3蛋白的T淋巴瘤细胞和表达MHC II的细胞的混合产物与待评价LAG3抗体共孵育,检测孵育产物中细胞因子的表达量。
2.根据权利要求1所述的用于评价LAG3抗体的生物学活性的方法,其特征在于,所述表达LAG3蛋白的T淋巴瘤细胞与所述表达MHC II的细胞的细胞数量比为(5~20):1。
3.根据权利要求2所述的用于评价LAG3抗体的生物学活性的方法,其特征在于,所述共孵育的孵育时间为22~26h。
4.根据权利要求1~3任一项所述的用于评价LAG3抗体的生物学活性的方法,其特征在于,所述表达LAG3蛋白的T淋巴瘤细胞中,hLAG3/hCD3的表达比为0.5~40;
优选地,所述表达LAG3蛋白的T淋巴瘤细胞中,hLAG3/hCD3的表达比为0.8~1.5。
5.根据权利要求4所述的用于评价LAG3抗体的生物学活性的方法,其特征在于,优选地,所述T淋巴瘤细胞为人源T淋巴瘤细胞;
优选地,所述表达LAG3蛋白的细胞为Jurkat细胞。
6.根据权利要求4所述的用于评价LAG3抗体的生物学活性的方法,其特征在于,所述表达MHC II的细胞为Raji细胞。
7.根据权利要求6所述的用于评价LAG3抗体的生物学活性的方法,其特征在于,在共孵育前,所述方法包括采用细胞增殖抑制剂处理Raji细胞1~3天;
优选地,所述增殖抑制剂为丝裂霉素C。
8.根据权利要求7所述的用于评价LAG3抗体的生物学活性的方法,其特征在于,所述丝裂霉素C的作用浓度为1~10μg/ml;
优选地,所述丝裂霉素C的作用浓度为2.5~10μg/ml。
9.根据权利要求1所述的用于评价LAG3抗体的生物学活性的方法,其特征在于,所述待评价LAG3抗体包括Relatlimab、LAG525、REGN3767、MK-4280、MGD013、Sym022、FS118和GSK2831781中的任意一种;
优选地,所述细胞因子包括IL2或干扰素γ。
10.用于评价LAG3抗体的生物学活性的试剂盒,其特征在于,其包括权利要求1~7任一项所述的表达LAG3蛋白的T淋巴瘤细胞和表达MHC II的细胞;
优选地,所述试剂盒还包括丝裂霉素C和/或细胞因子检测试剂;
优选地,所述细胞因子检测试剂为IL2检测试剂。
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