CN112062854B - 用于治疗肠癌的双特异性融合蛋白抗体及其应用 - Google Patents
用于治疗肠癌的双特异性融合蛋白抗体及其应用 Download PDFInfo
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Abstract
本发明公开了用于治疗肠癌的双特异性融合蛋白抗体及其应用。本发明双特异性融合蛋白抗体一条链为肠癌特异性抗原GUCY2C抗体,可与肠癌细胞特异性结合,其另一条链是ULBP2(NKG2D配体),可与NKs表面NKG2D活化受体结合。本发明的有益效果主要体现在:本发明对于肠癌双特异性抗体的研发,将极大的丰富晚期难治性肠癌的内科治疗手段,并可能极大的降低药物副反应和治疗的精准性;本发明双特异性融合蛋白抗体,可将NK活化并定位至肿瘤细胞,使得NK的肿瘤杀伤效率极大的提高,丰富了难治性肠癌的治疗手段。
Description
(一)技术领域
本发明涉及用于治疗肠癌的双特异性融合蛋白抗体及其应用。
(二)背景技术
自然杀伤细胞(Natural Killer Cells,NK细胞)作为血液中的单个核细胞中的一种,是人体先天免疫的核心组成部分,分布于外周各淋巴器官及血液循环系统,其主要功能是参与机体先天性免疫应答;同时在免疫调节中也发挥重要的作用,它无需抗原的刺激与活化即可发挥细胞毒效应;NK细胞的靶细胞主要包括:肿瘤细胞、病毒感染细胞、某些自身组织衰老细胞和细菌、寄生虫等,因此,NK细胞是机体抗肿瘤、抗感染的重要免疫因素;此外,NK细胞还参与第Ⅱ型超敏反应和抑制物抗宿主反应。
目前对NK细胞功能成熟和细胞毒活性的研究主要从它对NK细胞表面功能性受体的改变和NK细胞分泌效应因子的能力等方面来观察;IL-21可以明显地刺激NK细胞表面或滑行受体NKG2D分子的表达上调,从而激活NK细胞,协同低剂量IL-2显著地增强细胞增殖速率及毒活性。
4-1BB(CD137)是神经生长因子受体/肿瘤坏死因子受体家族成员之一,通过胞浆末尾区的聚集,与肿瘤坏死因子受体相关因子2(TRAF2)交流,依次活化ASK-1、JNK/SAPK或p38 MAP,启动级联放大效应,促进NK等免疫细胞活化、增殖、分化,调高杀伤肿瘤的活性。
双特异抗体是含有两种或多种特异性抗原结合位点的人工抗体,能在靶细胞和功能分子或细胞之间架起桥梁,激发具有导向性的免疫反应,在肿瘤等疾病治疗中表现出潜在价值。美国安进公司的新型靶向CD19和CD3的双特异性抗体Blincyto的上市,是对双特异性抗体产业的一个极大的鼓舞,该药被批准用于费城染色体阴性的复发或耐药急性淋巴母细胞性白血病的二线治疗,技术上归属于系列合成单抗,即T细胞双特异性单抗家族(BiTEs)。
双特异IgG抗体产生中的主要挑战就是轻、重链的正确连接,而以往最原始的方式是轻、重链随机合成非对称的异源二聚体IgG抗体,容易产生多种不需要的副产品;Knobs-into-holes(KiH)方法的使用解决了重链异二聚体的正确连结,但双抗轻链的正确连结仍未得到有效解决;此时,CrossMAb技术应运而生了!该技术基于双特异IgG抗体Fab臂功能域的交换而达成目的,解决了轻链连接的问题,而重链的正确结可利用KiH、静电转向技术达成。
实践证明CrossMAb已经成了具有广泛用途的抗体工程技术之一,可用于多种形式双特异抗体的构建,多项临床研究成功验证了该方法的可靠性,有4种独特设计的双特异抗体已经进入了I/II期临床试验,其中CEA TCB就是运用靶向肠癌特异性CEA抗原以及连接CD3抗体,来吸引更多淋巴毒T细胞靶向肠癌进行针对性的杀伤,临床试验已提示该双抗与PDL1单抗联合使用可显著提高难治性肠癌的疗效。
(三)发明内容
本发明目的是提供一种可将NK活化并定位至肿瘤细胞,使得NK的肿瘤杀伤效率极大的提高的双特异性融合蛋白抗体,及其在制备治疗肠癌的药物中的应用。
本发明采用的技术方案是:
一种用于治疗肠癌的双特异性融合蛋白抗体,其一条链为肠癌特异性抗原GUCY2C抗体,另一条链为ULBP2。
本发明双特异性融合蛋白抗体一条链为肠癌特异性抗原GUCY2C抗体,可与肠癌细胞特异性结合,其另一条链是ULBP2(NKG2D配体),可与NKs表面NKG2D活化受体结合。前期研究显示NKG2D受体激活后可“越过”MHC抑制效应对靶细胞进行杀伤,通过双特异性融合蛋白抗体,可将NK活化并定位至肿瘤细胞,使得NK的肿瘤杀伤效率极大的提高。本发明双抗起到的是桥梁的作用,形成免疫突触,同时可介导抗体依赖细胞介导的细胞毒性(ADCC)等生物效应,对NK细胞杀伤肿瘤有增益效果。
所述的双特异性融合蛋白抗体,由如下方法制得:
(1)将ULBP2-Ig Kappa轻链、重链及肠癌特异性蛋白GUCY2C相关抗体的可变区,分别连接到真核表达载体pATX2,以1:1:1:1配比与人悬浮胚胎肾细胞293F共转染,在293F表达系统中的表达,依靠CROSS MAB 技术,表达的氨基酸片段通过功能域的交换自动拼合成GUCY2C-NKG2D双特异性抗体。
(2)利用细胞工厂小批量转染293F细胞的方式表达双特异性抗体通过凝胶过滤、亲和层析、离子交换层析方式进行纯化,得到所述双特异性融合蛋白抗体。
所述ULBP2-Ig Kappa轻链核苷酸序列如SEQ ID No.4所示(编码SEQ ID No.5所示氨基酸),所述重链核苷酸序列如SEQ ID No.2所示(编码SEQ ID No.6 所示氨基酸),所述肠癌特异性抗原GUCY2C抗体的可变区核苷酸序列如SEQ ID No.3(编码SEQ ID No.7所示氨基酸)和SEQ ID No.1(编码SEQ ID No.8所示氨基酸)所示。
SEQ ID No.1序列如下:
>VL-MS7-CH1-725bp
GAATTCGCCGCCACCATGGAGACCGATACCCTGCTGCTGTGGGTGCT GCTGCTGTGGGTCCCTGGCAGCACCGGCGACGACATCCTGATGACACAGA GCCCTAGCAGCATGTACGCCTCCCTGGGCGAGAGGGTGACAATCACCTGC AAGGCCAGCCACGACATCAAGTCCTACCTGAGCTGGTACCAGCAGAAGC CTTGGAGGTCCCCTAAGACACTGATCTACTACACCACCGCCCTGGCCGAT GGCGTGCCCTCTAGATTCAGCGGCAGCGGCTCCGGCCAGGACTACAGCCT GACAATCTCCAGCCTGGAGAGCGATGATACCGCCACATACTACTGTCTGC AGCACGGCGAGAGCCCCTACACCTTTGGCGGCGGCACCAAGCTGGAGAT CAAGAGCAGCGCCAGCACAAAGGGCCCTTCCGTGTTCCCCCTGGCCCCCT CTTCCAAGTCCACAAGCGGCGGCACAGCCGCCCTGGGATGTCTGGTGAAG GATTACTTCCCCGAGCCTGTGACCGTGAGCTGGAATAGCGGCGCCCTGAC AAGCGGCGTGCACACATTTCCCGCCGTGCTGCAGAGCAGCGGCCTGTACA GCCTGAGCAGCGTGGTGACCGTGCCCAGCTCCAGCCTGGGCACCCAGACA TACATCTGCAATGTGAACCACAAGCCCAGCAATACAAAGGTGGATAAGA AGGTGGAGCCTAAGTCCTGTTGAGCGGCCGC
SEQ ID No.2序列如下:
>VH-KYK2.0-CH1-hinge-CH2-CH3(S354C-T366W)-1436bp
GAATTCGCCGCCACCATGGGCTGGTCCTGCATCATCCTGTTCCTGGTG GCCACCGCCACCGGCGTGCACTCTCAGGTGCAGCTGGTGGAGAGCGGCG GCGGACTGGTGAAGCCTGGCGGATCCCTGAGACTGTCCTGCGCCGCCAGC GGCTTTACCTTTAGCAGCTACGGCATGCACTGGGTGAGGCAGGCCCCCGG AAAGGGCCTGGAGTGGGTGGCTTTCATCAGATACGACGGCAGCAACAAG TACTACGCCGACAGCGTGAAGGGCAGGTTCACAATCAGCAGAGACAATT CCAAGAACACAAAGTACCTGCAGATGAATAGCCTGAGAGCCGAGGACAC AGCCGTGTACTACTGCGCCAAGGACAGAGGCCTGGGCGACGGCACCTAC TTTGACTACTGGGGCCAGGGCACCACAGTGACAGTGAGCAGCGCCTCCAC CAAGGGCCCTAGCGTGTTCCCCCTGGCCCCCTCTTCCAAGAGCACCAGCG GCGGCACAGCCGCCCTGGGATGTCTGGTGAAGGATTACTTTCCCGAGCCT GTGACCGTGTCCTGGAACAGCGGCGCCCTGACCTCCGGCGTGCACACATT CCCTGCCGTGCTGCAGAGCTCCGGCCTGTACTCCCTGTCCAGCGTGGTGA CCGTGCCTTCCAGCAGCCTGGGCACCCAGACCTACATCTGTAACGTGAAT CACAAGCCTAGCAACACCAAGGTGGACAAGAGGGTGGAGCCCAAGAGCT GCGATAAGACCCACACATGTCCCCCTTGCCCCGCCCCTGAGCTGCTGGGA GGACCTTCCGTGTTCCTGTTCCCCCCCAAGCCCAAGGACACCCTGATGAT CTCCAGAACCCCCGAGGTGACCTGCGTGGTGGTGGACGTGTCCCACGAGG ACCCTGAGGTGAAGTTTAACTGGTACGTGGACGGCGTGGAGGTGCACAA CGCCAAGACAAAGCCCAGAGAGGAGCAGTACAACAGCACCTACAGAGTG GTGAGCGTGCTGACCGTGCTGCACCAGGACTGGCTGAACGGCAAGGAGT ACAAGTGCAAGGTGAGCAATAAGGCCCTGCCCGCCCCCATCGAGAAGAC CATCAGCAAGGCCAAGGGCCAGCCCAGGGAGCCTCAGGTGTACACCCTG CCTCCTTGTAGAGAGGAGATGACCAAGAACCAGGTGTCCCTGTGGTGTCT GGTGAAAGGCTTCTACCCCAGCGATATCGCCGTGGAGTGGGAGTCCAATG GCCAGCCTGAGAACAACTACAAGACAACCCCTCCCGTGCTGGACAGCGA CGGCTCCTTCTTCCTGTACTCCAAGCTGACAGTGGATAAGAGCAGATGGC AGCAGGGCAATGTGTTCTCCTGTTCCGTGATGCACGAGGCCCTGCACAAC CACTACACCCAGAAGTCCCTGAGCCTGAGCCCCGGCAAGTGAGCGGCCG C
SEQ ID No.3序列如下:
>VH-MS7-CK-hinge-CH2-CH3 Y349C-T366S-L368A-Y407V-1448bp
GAATTCGCCGCCACCATGGGCTGGAGCTGCATCATCCTGTTCCTGGT GGCCACAGCCACCGGCGTGCACAGCGAGGTCATGCTGGTGGAGAGCGGC GGCGGCCTGGTGAAGCCAGGAGGATCCCTGAAGCTGAGCTGTGCCGCCA GCGGCTTCACATTCAGCACATACGCCATGAGCTGGGTGAGGCAGACCCCT GAGAAGAGACTGGAGTGGGTGGCCACCATCACAAGCGGCGGCTCCTACA CATACTACCCCGATTCCGTGAAGGGCAGGTTCACCATCAGCAGAGATAAC GCCAAGAATATCCTGTACCTGCAGATGTCCTCCCTGAGATCCGAGGATAC CGCCATGTACTACTGTACCAGGCTGAGACAGATCGGCCTGAGGGGCTTCA GCGACTACTGGGGCCAGGGCACCACCCTGACAGTGTCCTCCGCCAGCGTG GCCGCCCCTTCTGTGTTCATCTTCCCTCCCAGCGATGAGCAGCTGAAGAG CGGCACCGCCTCCGTGGTGTGCCTGCTGAATAATTTCTACCCCAGAGAGG CCAAGGTGCAGTGGAAGGTGGACAACGCCCTGCAGAGCGGCAACAGCCA GGAGTCCGTGACAGAGCAGGACTCCAAGGACAGCACATACAGCCTGAGC TCCACCCTGACCCTGTCCAAGGCCGACTACGAGAAGCACAAGGTGTACGC CTGCGAGGTGACCCACCAGGGCCTGTCCAGCCCTGTGACCAAGTCCTTCA ATAGAGGCGAGTGCGACAAGACACACACCTGCCCCCCTTGCCCTGCCCCT GAGCTGCTGGGAGGCCCTTCCGTGTTCCTGTTTCCTCCCAAGCCCAAGGA CACCCTGATGATCTCCAGGACACCCGAGGTGACATGCGTGGTGGTGGACG TGTCCCACGAGGACCCTGAGGTGAAGTTCAACTGGTACGTGGACGGCGTG GAGGTGCACAACGCCAAGACAAAGCCTAGAGAGGAGCAGTACAATTCCA CCTACAGAGTGGTGAGCGTGCTGACAGTGCTGCACCAGGACTGGCTGAAC GGCAAGGAGTACAAGTGTAAGGTGAGCAACAAGGCCCTGCCTGCCCCCA TCGAGAAGACCATCTCCAAGGCCAAGGGCCAGCCCAGGGAGCCTCAGGT GTGTACACTGCCTCCCAGCAGGGAGGAGATGACAAAGAATCAGGTGTCC CTGAGCTGTGCTGTGAAGGGCTTCTACCCTAGCGACATCGCCGTGGAGTG GGAGAGCAACGGCCAGCCCGAGAATAACTACAAGACCACCCCTCCCGTG CTGGACTCCGACGGCAGCTTTTTCCTGGTGAGCAAGCTGACCGTGGATAA GTCCAGATGGCAGCAGGGCAACGTGTTCAGCTGCTCCGTGATGCACGAGG CCCTGCACAACCACTACACACAGAAGAGCCTGTCCCTGTCCCCTGGCAAG TGAGCGGCCGC
SEQ ID No.4序列如下:
>VL-KYK2.0-CK-737bp
GAATTCGCCGCCACCATGGAGACCGATACCCTGCTGCTGTGGGTGCT GCTGCTGTGGGTCCCTGGCTCCACAGGCGACCAGAGCGCCCTGACACAGC CCGCTTCCGTGTCCGGCTCCCCCGGACAATCCATCACCATCTCCTGCTCCG GCTCCTCCAGCAATATCGGCAACAATGCCGTGAATTGGTACCAGCAGCTG CCTGGCAAGGCCCCTAAGCTGCTGATCTACTACGACGATCTGCTGCCTTC CGGCGTGAGCGACAGGTTCTCCGGCTCCAAGAGCGGCACCAGCGCCTTTC TGGCCATCAGCGGCCTGCAGTCCGAGGATGAGGCCGACTACTACTGCGCC GCCTGGGACGATAGCCTGAACGGCCCTGTGTTCGGCGGCGGCACAAAGCT GACCGTGCTGGGCCAGCCTAAGGCCGCCCCTAGCGTGACACTGTTCCCCC CTTCCAGCGAGGAGCTGCAGGCCAATAAGGCCACACTGGTGTGCCTGGTG TCCGACTTCTACCCTGGCGCCGTGACCGTGGCCTGGAAGGCTGATGGCTC CCCTGTGAAGGTGGGCGTGGAGACCACAAAGCCTTCCAAGCAGAGCAAT AATAAGTACGCCGCCTCCTCCTACCTGAGCCTGACACCTGAGCAGTGGAA GTCCCACAGGTCCTACAGCTGCAGGGTGACACACGAGGGCAGCACCGTG GAGAAGACAGTGGCCCCCGCCGAGTGTTCCTGAGCGGCCGC
SEQ ID No.5序列如下:
>VL-KYK2.0-CK(237AAs;24.94kDa)
METDTLLLWVLLLWVPGSTGDQSALTQPASVSGSPGQSITISCSGSSSNI GNNAVNWYQQLPGKAPKLLIYYDDLLPSGVSDRFSGSKSGTSAFLAISGLQS EDEADYYCAAWDDSLNGPVFGGGTKLTVLGQPKAAPSVTLFPPSSEELQAN KATLVCLVSDFYPGAVTVAWKADGSPVKVGVETTKPSKQSNNKYAASSYLS LTPEQWKSHRSYSCRVTHEGSTVEKTVAPAECS
Features:SIP[1:21]
SEQ ID No.6序列如下:
>VH-KYK2.0-CH1-hinge-CH2-CH3(S354C-T366W)(470Aas;51.47kDa)
MGWSCIILFLVATATGVHSQVQLVESGGGLVKPGGSLRLSCAASGFTFS SYGMHWVRQAPGKGLEWVAFIRYDGSNKYYADSVKGRFTISRDNSKNTKY LQMNSLRAEDTAVYYCAKDRGLGDGTYFDYWGQGTTVTVSSASTKGPSVF PLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSG LYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKRVEPKSCDKTHTCPPCPA PELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVE VHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEK TISKAKGQPREPQVYTLPPCREEMTKNQVSLWCLVKGFYPSDIAVEWESNGQ PENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYT QKSLSLSPGK
Features:SIP[1:19]
SEQ ID No.7序列如下:
>VH-MS7-CK-hinge-CH2-CH3 Y349C-T366S-L368A-Y407V(474AAs; 52.34kDa)
MGWSCIILFLVATATGVHSEVMLVESGGGLVKPGGSLKLSCAASGFTFS TYAMSWVRQTPEKRLEWVATITSGGSYTYYPDSVKGRFTISRDNAKNILYLQ MSSLRSEDTAMYYCTRLRQIGLRGFSDYWGQGTTLTVSSASVAAPSVFIFPPS DEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDST YSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGECDKTHTCPPCP APELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGV EVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIE KTISKAKGQPREPQVCTLPPSREEMTKNQVSLSCAVKGFYPSDIAVEWESNG QPENNYKTTPPVLDSDGSFFLVSKLTVDKSRWQQGNVFSCSVMHEALHNHY TQKSLSLSPGK
Features:SIP[1:19]
SEQ ID No.8序列如下:
>VL-MS7-CH1(233AAs;24.85kDa)
METDTLLLWVLLLWVPGSTGDDILMTQSPSSMYASLGERVTITCKASHD IKSYLSWYQQKPWRSPKTLIYYTTALADGVPSRFSGSGSGQDYSLTISSLESD DTATYYCLQHGESPYTFGGGTKLEIKSSASTKGPSVFPLAPSSKSTSGGTAAL GCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSC
Features:SIP[1:21]
本发明还涉及所述双特异性融合蛋白抗体在制备治疗肠癌的药物中的应用。
具体的,本发明双特异性融合蛋白抗体可与NK细胞联用。异体T细胞与人类白细胞抗原(HLA)复合物相互作用可能导致致命的移植物抗宿主病,但是NK细胞与HLA的互作要小得多,因此双抗联合NK细胞疗法不会产生严重的副反应。
本发明的有益效果主要体现在:
(1)本发明对于肠癌双特异性抗体的研发,将极大的丰富晚期难治性肠癌的内科治疗手段,并可能极大的降低药物副反应和治疗的精准性;
(2)本发明双特异性融合蛋白抗体,可将NK活化并定位至肿瘤细胞,使得 NK的肿瘤杀伤效率极大的提高,丰富了难治性肠癌的治疗手段。
(四)附图说明
图2为抗GCC/NKG2D双抗100ml量级的表达纯化效果SDS-PAGE分析图;说明:MW为分子量参照物,IN为输入液,FT为滤液,W为冲洗液,E2 至E11为进行缓冲液交换和浓缩后的产品
图3为最终抗GCC/NKG2D双抗质控图;说明:Non-reduced为未变性蛋白, Reduced为变性蛋白。
图4为抗GCC/NKG2D双抗检测人NK细胞NKG2D抗原蛋白表达流式峰图;说明:L1空白对照;L2同型对照;L3Alexa Fluor 488标记的荧光二抗(双抗2.5ug/ml);L4 Alexa Fluor488标记的荧光二抗(双抗5ug/ml)。
图5为抗GCC/NKG2D双抗对Caco-2癌细胞增殖活性的影响。
图6为抗GCC/NKG2D双抗在小鼠体内MTD毒性试验结果。
(五)具体实施方式
为了加深对本发明的理解,下面将结合具体实施例对本发明做进一步详细描述,该实施例仅用于解释本发明,并不对本发明的保护范围构成限定。
实施例1:
1、抗GCC/NKG2D双抗表达载体的构建及抗体蛋白的表达纯化
1.1抗GCC/NKG2D双抗表达载体的构建及验证
将ULBP2-Ig Kappa轻链>VL-KYK2.0-CK-737bp、重链 VH-KYK2.0-CH1-hinge-CH2-CH3-1436bp及肠癌特异性蛋白GUCY2C相关抗体的可变区>VH-MS7-CK-hinge-CH2-CH3Y349C-T366S-L368A-Y407V-1448bp 和>VL-MS7-CH1-725bp,分别连接到真核表达载体pATX2,然后人悬浮胚胎肾细胞293F表达系统中的表达和纯化。具体为将H-KYK2.0-CH1-hinge-CH2-CH3-pATX2,VL-KYK2.0-CK-pATX2, VH-MS7-CK-hinge-CH2-CH3-pATX2和VL-MS7-CH1-pATX2以1:1:1:1配比与 293F细胞共转染.然后收获细胞与培养基。依靠CROSSMAB技术,表达的氨基酸片段将通过功能域的交换自动拼合成GUCY2C-NKG2D双特异性抗体。因此通过小量转染293F细胞对构建表达的NKG2DL(ULBP2)-GUCY2C进行验证。采用聚丙烯凝胶电泳联合检测分析双特异性抗体的表达情况。
结果见图1,显示双抗在人悬浮胚胎肾细胞293细胞中稳定表达。
1.2抗GCC/NKG2D双抗的表达纯化
利用细胞工厂转染100ml 293F细胞的方式表达一批双特异性抗体,通过 ProteinG resin凝胶层析柱亲和层析,ph=5的TBS洗涤后,用0.1M Glycine pH 3.0 洗脱,用1MTris-HCl,pH 8.5缓冲液进行中和纯化,通过聚丙烯酰胺凝胶电泳方式分析抗体的表达量及纯化效果。
结果见图2,显示双抗100ml量级的表达纯化效果仍佳。同时验证纯化后的双特异性抗体与肠癌细胞的结合情况及对于NK细胞刺激效果。通过筛选稳定细胞株的方式,获得高效表达双特异性抗体的稳转细胞株,为后续抗体的大量生产做准备。
1.3抗GCC/NKG2D双抗的质量控制
将得到的2ug双抗和变性后的2ug双抗进行丙烯凝胶电泳,结果见图3,结果说明得到的双抗与构建的分子量一致,其轻链及重链也与原先NKG2DL (ULBP2)、GUCY2C分子量一致,最终抗GCC/NKG2D双抗有良好的质量控制。
2、抗GCC/NKG2D双抗亲和力的鉴定
采用生物传感器测定双特异性抗体对于NK细胞特异性蛋白NKG2D及肠癌细胞特异性抗原GUCY2C的亲和力,并且分析其对于两种蛋白的亲和力差异。根据亲和力的差异指导抗体在结合NK细胞时的抗体用量。流式细胞检测峰图显示,Caco-2肠癌细胞株与双抗作用后结合效应明显,并且2.5ug/ml的双抗浓度可达到与5.0ug/ml相同的结合效应,故后续双抗推荐使用浓度为2.0~2.5ug/ml。同样的,流式峰图显示本发明合成的双抗能与人外周血分离纯化的NK细胞具有良好的反应性。
实施例2:
2.1使用抗GCC/NKG2D双抗检测人NK细胞NKG2D抗原蛋白表达
人外周血分离纯化的NK细胞,用PBS调准细胞浓度2×106/ml。取0.1ml 细胞,加入抗GCC-NKG2D双抗(人源化),终浓度分别为2.5ug/ml和5ug/ml,室温反应1小时。用PBS(含5%FCS和0.1%NaN3)细胞3次后,加入100μL Goat anti-Human IgG(H+L)Cross-AdsorbedSecondary Antibody,Alexa Fluor 488(1:400,5ug/ml)(Molecular Probes,Cat#A-11013)荧光标记的二抗,荧光二抗终浓度5ug/mL,避光反应30min。用PBS(含5%FCS和0.1%NaN3) 洗细胞3次后,流式细胞仪(BD Canto II)检测。
结果见图4,显示双抗能与人外周血分离纯化的NK细胞具有良好的反应性。
2.2双抗抗结肠癌细胞的生物功能鉴定
(1)癌细胞增殖活性检测:
癌细胞系:Caco-2(GCC-Positive)
人NK细胞:临床分离纯化
试剂盒:CCK8
方法:取5000个癌细胞铺在96孔板中,培养2小时待细胞粘壁后,加不同效靶比例的NK细胞(NK:cancer cell分别为1:1,2:1,5:1,10:1,20:1),同时加入双抗体终浓度为1、2μg/ml。同时设有正常人IgG对照组(2μg/ml),共培养24、48、72小时后,分别用CCK8检测细胞活力。
双抗对Caco-2癌细胞增殖活性的影响参见图5,结果显示,加用双抗的 Caco-2在双抗和NK细胞的共同作用下,随着时间的推移,出现了增殖活性的最大抑制,提示本发明获得的双特异性抗体可特异性结合靶向肿瘤细胞和NK 细胞,并获得更好的抑制肿瘤效应,在相同的效应细胞(NK细胞):靶细胞比例下,加入双抗抗体对肿瘤细胞杀伤有增效效果。
2.3双抗在小鼠体内的毒性测定
评价药物双抗在Balb/c小鼠上的MTD的研究。
方法:
1.实验动物:Bal b/c小鼠,雌性,6~8周龄,体重约18~20g,6只。
2.实验分组:按照小鼠体重进行分组(每组3只),A组按小鼠体重给予 6.25mg/kg双抗腹腔注射,每周2次。B组按小鼠体重给予12.5mg/kg双抗腹腔注射,每周2次。
3.实验观察:实验动物在治疗后,每天进行观察,记录其发病和死亡等。对所有的实验动物进行行为、进食、摄水、体重改变、毛发光泽和其他一些异常情况的监测。所有小鼠每天测量体重。同时计算给药后小鼠体重增长变化率:体重变化用公式RCBW%=(BWi–BW0)/BW0×100%,BWi是小鼠当前体重, BW0是分组当日的小鼠体重;
4.实验终止:当小鼠体重下降超过20%,将进行安乐死处理。
双抗在小鼠体内的毒性测定见图6,结果显示,双抗在6.25mg/kg和12.5 mg/kg剂量下均无明显毒性,能够被机体耐受,安全性高。
序列表
<110> 浙江大学
<120> 用于治疗肠癌的双特异性融合蛋白抗体及其应用
<160> 8
<170> SIPOSequenceListing 1.0
<210> 1
<211> 725
<212> DNA
<213> 未知(Unknown)
<400> 1
gaattcgccg ccaccatgga gaccgatacc ctgctgctgt gggtgctgct gctgtgggtc 60
cctggcagca ccggcgacga catcctgatg acacagagcc ctagcagcat gtacgcctcc 120
ctgggcgaga gggtgacaat cacctgcaag gccagccacg acatcaagtc ctacctgagc 180
tggtaccagc agaagccttg gaggtcccct aagacactga tctactacac caccgccctg 240
gccgatggcg tgccctctag attcagcggc agcggctccg gccaggacta cagcctgaca 300
atctccagcc tggagagcga tgataccgcc acatactact gtctgcagca cggcgagagc 360
ccctacacct ttggcggcgg caccaagctg gagatcaaga gcagcgccag cacaaagggc 420
ccttccgtgt tccccctggc cccctcttcc aagtccacaa gcggcggcac agccgccctg 480
ggatgtctgg tgaaggatta cttccccgag cctgtgaccg tgagctggaa tagcggcgcc 540
ctgacaagcg gcgtgcacac atttcccgcc gtgctgcaga gcagcggcct gtacagcctg 600
agcagcgtgg tgaccgtgcc cagctccagc ctgggcaccc agacatacat ctgcaatgtg 660
aaccacaagc ccagcaatac aaaggtggat aagaaggtgg agcctaagtc ctgttgagcg 720
gccgc 725
<210> 2
<211> 1436
<212> DNA
<213> 未知(Unknown)
<400> 2
gaattcgccg ccaccatggg ctggtcctgc atcatcctgt tcctggtggc caccgccacc 60
ggcgtgcact ctcaggtgca gctggtggag agcggcggcg gactggtgaa gcctggcgga 120
tccctgagac tgtcctgcgc cgccagcggc tttaccttta gcagctacgg catgcactgg 180
gtgaggcagg cccccggaaa gggcctggag tgggtggctt tcatcagata cgacggcagc 240
aacaagtact acgccgacag cgtgaagggc aggttcacaa tcagcagaga caattccaag 300
aacacaaagt acctgcagat gaatagcctg agagccgagg acacagccgt gtactactgc 360
gccaaggaca gaggcctggg cgacggcacc tactttgact actggggcca gggcaccaca 420
gtgacagtga gcagcgcctc caccaagggc cctagcgtgt tccccctggc cccctcttcc 480
aagagcacca gcggcggcac agccgccctg ggatgtctgg tgaaggatta ctttcccgag 540
cctgtgaccg tgtcctggaa cagcggcgcc ctgacctccg gcgtgcacac attccctgcc 600
gtgctgcaga gctccggcct gtactccctg tccagcgtgg tgaccgtgcc ttccagcagc 660
ctgggcaccc agacctacat ctgtaacgtg aatcacaagc ctagcaacac caaggtggac 720
aagagggtgg agcccaagag ctgcgataag acccacacat gtcccccttg ccccgcccct 780
gagctgctgg gaggaccttc cgtgttcctg ttccccccca agcccaagga caccctgatg 840
atctccagaa cccccgaggt gacctgcgtg gtggtggacg tgtcccacga ggaccctgag 900
gtgaagttta actggtacgt ggacggcgtg gaggtgcaca acgccaagac aaagcccaga 960
gaggagcagt acaacagcac ctacagagtg gtgagcgtgc tgaccgtgct gcaccaggac 1020
tggctgaacg gcaaggagta caagtgcaag gtgagcaata aggccctgcc cgcccccatc 1080
gagaagacca tcagcaaggc caagggccag cccagggagc ctcaggtgta caccctgcct 1140
ccttgtagag aggagatgac caagaaccag gtgtccctgt ggtgtctggt gaaaggcttc 1200
taccccagcg atatcgccgt ggagtgggag tccaatggcc agcctgagaa caactacaag 1260
acaacccctc ccgtgctgga cagcgacggc tccttcttcc tgtactccaa gctgacagtg 1320
gataagagca gatggcagca gggcaatgtg ttctcctgtt ccgtgatgca cgaggccctg 1380
cacaaccact acacccagaa gtccctgagc ctgagccccg gcaagtgagc ggccgc 1436
<210> 3
<211> 1448
<212> DNA
<213> 未知(Unknown)
<400> 3
gaattcgccg ccaccatggg ctggagctgc atcatcctgt tcctggtggc cacagccacc 60
ggcgtgcaca gcgaggtcat gctggtggag agcggcggcg gcctggtgaa gccaggagga 120
tccctgaagc tgagctgtgc cgccagcggc ttcacattca gcacatacgc catgagctgg 180
gtgaggcaga cccctgagaa gagactggag tgggtggcca ccatcacaag cggcggctcc 240
tacacatact accccgattc cgtgaagggc aggttcacca tcagcagaga taacgccaag 300
aatatcctgt acctgcagat gtcctccctg agatccgagg ataccgccat gtactactgt 360
accaggctga gacagatcgg cctgaggggc ttcagcgact actggggcca gggcaccacc 420
ctgacagtgt cctccgccag cgtggccgcc ccttctgtgt tcatcttccc tcccagcgat 480
gagcagctga agagcggcac cgcctccgtg gtgtgcctgc tgaataattt ctaccccaga 540
gaggccaagg tgcagtggaa ggtggacaac gccctgcaga gcggcaacag ccaggagtcc 600
gtgacagagc aggactccaa ggacagcaca tacagcctga gctccaccct gaccctgtcc 660
aaggccgact acgagaagca caaggtgtac gcctgcgagg tgacccacca gggcctgtcc 720
agccctgtga ccaagtcctt caatagaggc gagtgcgaca agacacacac ctgcccccct 780
tgccctgccc ctgagctgct gggaggccct tccgtgttcc tgtttcctcc caagcccaag 840
gacaccctga tgatctccag gacacccgag gtgacatgcg tggtggtgga cgtgtcccac 900
gaggaccctg aggtgaagtt caactggtac gtggacggcg tggaggtgca caacgccaag 960
acaaagccta gagaggagca gtacaattcc acctacagag tggtgagcgt gctgacagtg 1020
ctgcaccagg actggctgaa cggcaaggag tacaagtgta aggtgagcaa caaggccctg 1080
cctgccccca tcgagaagac catctccaag gccaagggcc agcccaggga gcctcaggtg 1140
tgtacactgc ctcccagcag ggaggagatg acaaagaatc aggtgtccct gagctgtgct 1200
gtgaagggct tctaccctag cgacatcgcc gtggagtggg agagcaacgg ccagcccgag 1260
aataactaca agaccacccc tcccgtgctg gactccgacg gcagcttttt cctggtgagc 1320
aagctgaccg tggataagtc cagatggcag cagggcaacg tgttcagctg ctccgtgatg 1380
cacgaggccc tgcacaacca ctacacacag aagagcctgt ccctgtcccc tggcaagtga 1440
gcggccgc 1448
<210> 4
<211> 737
<212> DNA
<213> 未知(Unknown)
<400> 4
gaattcgccg ccaccatgga gaccgatacc ctgctgctgt gggtgctgct gctgtgggtc 60
cctggctcca caggcgacca gagcgccctg acacagcccg cttccgtgtc cggctccccc 120
ggacaatcca tcaccatctc ctgctccggc tcctccagca atatcggcaa caatgccgtg 180
aattggtacc agcagctgcc tggcaaggcc cctaagctgc tgatctacta cgacgatctg 240
ctgccttccg gcgtgagcga caggttctcc ggctccaaga gcggcaccag cgcctttctg 300
gccatcagcg gcctgcagtc cgaggatgag gccgactact actgcgccgc ctgggacgat 360
agcctgaacg gccctgtgtt cggcggcggc acaaagctga ccgtgctggg ccagcctaag 420
gccgccccta gcgtgacact gttcccccct tccagcgagg agctgcaggc caataaggcc 480
acactggtgt gcctggtgtc cgacttctac cctggcgccg tgaccgtggc ctggaaggct 540
gatggctccc ctgtgaaggt gggcgtggag accacaaagc cttccaagca gagcaataat 600
aagtacgccg cctcctccta cctgagcctg acacctgagc agtggaagtc ccacaggtcc 660
tacagctgca gggtgacaca cgagggcagc accgtggaga agacagtggc ccccgccgag 720
tgttcctgag cggccgc 737
<210> 5
<211> 237
<212> PRT
<213> 未知(Unknown)
<400> 5
Met Glu Thr Asp Thr Leu Leu Leu Trp Val Leu Leu Leu Trp Val Pro
1 5 10 15
Gly Ser Thr Gly Asp Gln Ser Ala Leu Thr Gln Pro Ala Ser Val Ser
20 25 30
Gly Ser Pro Gly Gln Ser Ile Thr Ile Ser Cys Ser Gly Ser Ser Ser
35 40 45
Asn Ile Gly Asn Asn Ala Val Asn Trp Tyr Gln Gln Leu Pro Gly Lys
50 55 60
Ala Pro Lys Leu Leu Ile Tyr Tyr Asp Asp Leu Leu Pro Ser Gly Val
65 70 75 80
Ser Asp Arg Phe Ser Gly Ser Lys Ser Gly Thr Ser Ala Phe Leu Ala
85 90 95
Ile Ser Gly Leu Gln Ser Glu Asp Glu Ala Asp Tyr Tyr Cys Ala Ala
100 105 110
Trp Asp Asp Ser Leu Asn Gly Pro Val Phe Gly Gly Gly Thr Lys Leu
115 120 125
Thr Val Leu Gly Gln Pro Lys Ala Ala Pro Ser Val Thr Leu Phe Pro
130 135 140
Pro Ser Ser Glu Glu Leu Gln Ala Asn Lys Ala Thr Leu Val Cys Leu
145 150 155 160
Val Ser Asp Phe Tyr Pro Gly Ala Val Thr Val Ala Trp Lys Ala Asp
165 170 175
Gly Ser Pro Val Lys Val Gly Val Glu Thr Thr Lys Pro Ser Lys Gln
180 185 190
Ser Asn Asn Lys Tyr Ala Ala Ser Ser Tyr Leu Ser Leu Thr Pro Glu
195 200 205
Gln Trp Lys Ser His Arg Ser Tyr Ser Cys Arg Val Thr His Glu Gly
210 215 220
Ser Thr Val Glu Lys Thr Val Ala Pro Ala Glu Cys Ser
225 230 235
<210> 6
<211> 470
<212> PRT
<213> 未知(Unknown)
<400> 6
Met Gly Trp Ser Cys Ile Ile Leu Phe Leu Val Ala Thr Ala Thr Gly
1 5 10 15
Val His Ser Gln Val Gln Leu Val Glu Ser Gly Gly Gly Leu Val Lys
20 25 30
Pro Gly Gly Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe
35 40 45
Ser Ser Tyr Gly Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu
50 55 60
Glu Trp Val Ala Phe Ile Arg Tyr Asp Gly Ser Asn Lys Tyr Tyr Ala
65 70 75 80
Asp Ser Val Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ser Lys Asn
85 90 95
Thr Lys Tyr Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val
100 105 110
Tyr Tyr Cys Ala Lys Asp Arg Gly Leu Gly Asp Gly Thr Tyr Phe Asp
115 120 125
Tyr Trp Gly Gln Gly Thr Thr Val Thr Val Ser Ser Ala Ser Thr Lys
130 135 140
Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys Ser Thr Ser Gly
145 150 155 160
Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr Phe Pro Glu Pro
165 170 175
Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser Gly Val His Thr
180 185 190
Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser Leu Ser Ser Val
195 200 205
Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr Tyr Ile Cys Asn
210 215 220
Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys Arg Val Glu Pro
225 230 235 240
Lys Ser Cys Asp Lys Thr His Thr Cys Pro Pro Cys Pro Ala Pro Glu
245 250 255
Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp
260 265 270
Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
275 280 285
Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly
290 295 300
Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn
305 310 315 320
Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp
325 330 335
Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro
340 345 350
Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu
355 360 365
Pro Gln Val Tyr Thr Leu Pro Pro Cys Arg Glu Glu Met Thr Lys Asn
370 375 380
Gln Val Ser Leu Trp Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
385 390 395 400
Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr
405 410 415
Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys
420 425 430
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys
435 440 445
Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu
450 455 460
Ser Leu Ser Pro Gly Lys
465 470
<210> 7
<211> 474
<212> PRT
<213> 未知(Unknown)
<400> 7
Met Gly Trp Ser Cys Ile Ile Leu Phe Leu Val Ala Thr Ala Thr Gly
1 5 10 15
Val His Ser Glu Val Met Leu Val Glu Ser Gly Gly Gly Leu Val Lys
20 25 30
Pro Gly Gly Ser Leu Lys Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe
35 40 45
Ser Thr Tyr Ala Met Ser Trp Val Arg Gln Thr Pro Glu Lys Arg Leu
50 55 60
Glu Trp Val Ala Thr Ile Thr Ser Gly Gly Ser Tyr Thr Tyr Tyr Pro
65 70 75 80
Asp Ser Val Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn
85 90 95
Ile Leu Tyr Leu Gln Met Ser Ser Leu Arg Ser Glu Asp Thr Ala Met
100 105 110
Tyr Tyr Cys Thr Arg Leu Arg Gln Ile Gly Leu Arg Gly Phe Ser Asp
115 120 125
Tyr Trp Gly Gln Gly Thr Thr Leu Thr Val Ser Ser Ala Ser Val Ala
130 135 140
Ala Pro Ser Val Phe Ile Phe Pro Pro Ser Asp Glu Gln Leu Lys Ser
145 150 155 160
Gly Thr Ala Ser Val Val Cys Leu Leu Asn Asn Phe Tyr Pro Arg Glu
165 170 175
Ala Lys Val Gln Trp Lys Val Asp Asn Ala Leu Gln Ser Gly Asn Ser
180 185 190
Gln Glu Ser Val Thr Glu Gln Asp Ser Lys Asp Ser Thr Tyr Ser Leu
195 200 205
Ser Ser Thr Leu Thr Leu Ser Lys Ala Asp Tyr Glu Lys His Lys Val
210 215 220
Tyr Ala Cys Glu Val Thr His Gln Gly Leu Ser Ser Pro Val Thr Lys
225 230 235 240
Ser Phe Asn Arg Gly Glu Cys Asp Lys Thr His Thr Cys Pro Pro Cys
245 250 255
Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro
260 265 270
Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys
275 280 285
Val Val Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp
290 295 300
Tyr Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu
305 310 315 320
Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu
325 330 335
His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn
340 345 350
Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly
355 360 365
Gln Pro Arg Glu Pro Gln Val Cys Thr Leu Pro Pro Ser Arg Glu Glu
370 375 380
Met Thr Lys Asn Gln Val Ser Leu Ser Cys Ala Val Lys Gly Phe Tyr
385 390 395 400
Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn
405 410 415
Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe
420 425 430
Leu Val Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn
435 440 445
Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr
450 455 460
Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys
465 470
<210> 8
<211> 233
<212> PRT
<213> 未知(Unknown)
<400> 8
Met Glu Thr Asp Thr Leu Leu Leu Trp Val Leu Leu Leu Trp Val Pro
1 5 10 15
Gly Ser Thr Gly Asp Asp Ile Leu Met Thr Gln Ser Pro Ser Ser Met
20 25 30
Tyr Ala Ser Leu Gly Glu Arg Val Thr Ile Thr Cys Lys Ala Ser His
35 40 45
Asp Ile Lys Ser Tyr Leu Ser Trp Tyr Gln Gln Lys Pro Trp Arg Ser
50 55 60
Pro Lys Thr Leu Ile Tyr Tyr Thr Thr Ala Leu Ala Asp Gly Val Pro
65 70 75 80
Ser Arg Phe Ser Gly Ser Gly Ser Gly Gln Asp Tyr Ser Leu Thr Ile
85 90 95
Ser Ser Leu Glu Ser Asp Asp Thr Ala Thr Tyr Tyr Cys Leu Gln His
100 105 110
Gly Glu Ser Pro Tyr Thr Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
115 120 125
Ser Ser Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser
130 135 140
Ser Lys Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys
145 150 155 160
Asp Tyr Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu
165 170 175
Thr Ser Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
180 185 190
Tyr Ser Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr
195 200 205
Gln Thr Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val
210 215 220
Asp Lys Lys Val Glu Pro Lys Ser Cys
225 230
Claims (3)
1.一种用于治疗肠癌的双特异性融合蛋白抗体,其一条链为肠癌特异性抗原GUCY2C抗体,另一条链为ULBP2,由如下方法制得:
(1)将核苷酸序列如SEQ ID No.4所示的ULBP2-Ig Kappa轻链、核苷酸序列如SEQ IDNo.2所示的ULBP2-Ig重链及核苷酸序列分别如SEQ ID No.3和SEQ ID No.1所示的肠癌特异性抗原GUCY2C抗体的重链和轻链可变区,分别连接到真核表达载体pATX2,以1:1:1:1配比与人悬浮胚胎肾细胞293F共转染,在293F表达系统中的表达,依靠CROSS MAB技术,表达的氨基酸片段通过功能域的交换自动拼合成GUCY2C-ULBP2双特异性融合蛋白抗体;
(2)利用细胞工厂小批量转染293F细胞的方式表达双特异性融合蛋白抗体,通过凝胶过滤、亲和层析、离子交换层析方式进行纯化,得到所述双特异性融合蛋白抗体。
2.权利要求1所述双特异性融合蛋白抗体在制备治疗肠癌的药物中的应用。
3.如权利要求2所述的应用,其特征在于所述双特异性融合蛋白抗体与NK细胞联用。
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A novel bispecific protein (ULBP2-BB4) targeting the NKG2D receptor on natural killer (NK) cells and CD138 activates NK cells and has potent antitumor activity against human multiple myeloma in vitro and in vivo;Elke Pogge von Strandmann等;《BLOOD》;20060301;第107卷(第5期);第1955-1962页,参见全文 * |
Redirecting NK cells mediated tumor cell lysis by a new recombinant bifunctional protein;Claire Germain等;《Protein Engineering, Design & Selection》;20080911;第21卷(第11期);第665-672页,参见全文 * |
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