CN111153994A - 人肿瘤坏死因子的人源单克隆抗体 - Google Patents

人肿瘤坏死因子的人源单克隆抗体 Download PDF

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CN111153994A
CN111153994A CN201911416304.5A CN201911416304A CN111153994A CN 111153994 A CN111153994 A CN 111153994A CN 201911416304 A CN201911416304 A CN 201911416304A CN 111153994 A CN111153994 A CN 111153994A
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龚睿
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Wuhan Banke Biotechnology Co ltd
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    • C07K16/18Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
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Abstract

本发明公开了一种针对人肿瘤坏死因子的人源单克隆抗体,通过筛选和基因改造后,所获抗体的特异性好、中和活性强、抗聚集性增,适用于制备针对自身免疫性疾病的治疗性药物。

Description

人肿瘤坏死因子的人源单克隆抗体
技术领域
本发明涉及生物技术领域,具体地指一种人肿瘤坏死因子的人源单克隆抗体。
背景技术
肿瘤坏死因子(TNFα)是一种人体炎症反应相关蛋白,过量的TNFα会导致自身免疫性疾病的发生。研发针对TNFα的抗体将有利于降低体内的TNFα含量,加速其在体内的清除,从而治疗相关自身免疫性疾病。目前已有的针对TNFα的抗体由于在临床使用中易产生抗抗体现象,导致该抗体对部分病人失去治疗效果,因此开发新的针对TNFα的人源单克隆抗体有利于缓解该问题。
发明内容
本发明的目的在于填补现有技术的空白,提供一种针对人肿瘤坏死因子的人源单克隆抗体。
为实现上述目的,本发明提供了一种针对人肿瘤坏死因子的人源单克隆抗体,其轻链序列如SEQ No.1所示,其重链序列如SEQ No.3所示。
上述针对人肿瘤坏死因子的人源单克隆抗体对应的碱基序列,其轻链序列如SEQNo.4所示,其重链序列如SEQ No.5所示。
本发明的有益效果:通过筛选和基因改造后,所获抗体的特异性好、中和活性强、抗聚集性增强,适用于制备针对自身免疫性疾病的治疗性药物。
附图说明
图1-1为Tango软件预测FC9抗体氨基酸序列的易聚集区。
图1-2为Tango软件预测FC9抗体突变后氨基酸序列的易聚集区。
图1-3为FC0和FC9的重链突变区域比较图。
图2为SDS-PAGE对FC9抗体的检测图。
图3为ELISA分析FC9抗体与人TNFα的结合图。
图4为FC9抗体降低人TNFα对L929细胞的杀伤效果图。
具体实施方式
以下结合附图和具体实施例对本发明作进一步的详细描述。以下实施例是在以本发明技术方案为前提下进行实施,给出了详细的实施方式和具体的操作过程,但本发明的保护范围不限于下述的实施例。
实施例1:FC0抗体序列的获得
按照已有的文献(Zhu Z,Dimitrov DS,Methods Mol Biol,2009)构建了人源Fab噬菌体展示文库,并基于该文库对人TNFα蛋白进行了四轮的筛选,并通过单克隆phageELISA,将其中的阳性克隆送测序,得到了FC0候选克隆的碱基序列,并经氨基酸翻译软件(https://web.expasy.org/translate/),得到了其氨基酸序列,轻链氨基酸序列如SEQNo.1所示,其重链氨基酸序列如SEQ No.2所示。
实施例2:利用Tango软件对获得的FC0氨基酸序列进行优化
利用Tango软件(http://tango.crg.es/)对FC0候选克隆的氨基酸序列进行易聚集区预测,发现其中存在较强的易聚集区域,如图1-1,因此对该区域进行点突变,得到FC9抗体,其轻链氨基酸序列如SEQ No.1所示,其重链氨基酸序列如SEQ No.3所示,对应碱基序列,轻链如SEQ No.4所示,重链如SEQ No.5所示。突变后的氨基酸序列经Tango软件重新预测,发现该易聚集区被明显改善,如图1-2,1-3。
实施例3:293F细胞表达FC9抗体并SDS-PAGE检测
将突变后的碱基序列克隆到双启动载体pVitro2-neo-mcs(InvivoGen)上,利用PEI转染293F细胞后进行蛋白的表达,经过5-7天的表达,将293F细胞的培养上清经ProteinA(GE)纯化,将纯化后的蛋白经过浓换液后,得到溶于PBS缓冲液的FC9抗体。经SDS-PAGE电泳检测,发现其呈现轻链和重链两条带,如图2所示。
实施例4:ELISA分析FC9抗体与人TNFα蛋白的结合
包被人TNFα蛋白在ELISA板上,将FC9抗体经梯度稀释后作为一抗,HRP标记的Goat-anti-human IgG-Fc(Abcam)作为二抗,显色后,通过信号强度变化计算EC50,约在0.4nM,如图3所示。
实施例5:FC9抗体降低人TNFα对L929细胞的杀伤。
人TNFα对L929细胞有较强的杀伤作用,用抗体中和掉人TNFα因子可以降低其对细胞的杀伤效果。为验证FC9抗体对人TNFα的中和作用,梯度稀释的FC9抗体分别与人TNFα混合后加入到提前一天铺好的L929细胞中,加完后放置于37℃培养箱培养,24h后弃去培养基上清,加入CCK-8试剂显色,根据细胞的存活率就算FC9抗体对人TNFα的中和活性,约为20nM,如图4所示。
SEQUENCE LISTING
<110> 武汉班科生物技术股份有限公司
<120> 人肿瘤坏死因子的人源单克隆抗体
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ggtaaa 1326

Claims (2)

1.一种针对人肿瘤坏死因子的人源单克隆抗体,其特征在于,其轻链序列如SEQ No.1所示,其重链序列如SEQ No.3所示。
2.权利要求1所述针对人肿瘤坏死因子的人源单克隆抗体对应的碱基序列,其轻链序列如SEQ No.4所示,其重链序列如SEQ No.5所示。
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