CN101094688B - 多聚构建体 - Google Patents
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- CN101094688B CN101094688B CN2005800386237A CN200580038623A CN101094688B CN 101094688 B CN101094688 B CN 101094688B CN 2005800386237 A CN2005800386237 A CN 2005800386237A CN 200580038623 A CN200580038623 A CN 200580038623A CN 101094688 B CN101094688 B CN 101094688B
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Abstract
通过包涵体(inclusion)或连接体(linker)部分使Flt-1的Ig样结构域的多聚融合蛋白功能化。编码融合蛋白的载体和表达融合蛋白的宿主细胞可以治疗性地用于在患有与新血管形成有关的病理状况的个体内阻断新血管形成。这类病症包括年龄相关性黄斑变性、癌症、牛皮癣、增生性糖尿病视网膜病变、哮喘、葡萄膜炎、骨关节炎和类风湿性关节炎。用于Flt-1的Ig样结构域的相同多聚手段,即连接体和多聚结构域,可用于其他多肽,包括细胞外受体、抗体可变区、细胞因子、趋化因子和生长因子。
Description
技术领域
本发明涉及可用于治疗病理性新血管形成,例如哮喘、关节炎、癌症和黄斑变性的重组构建蛋白。
背景技术
病理性新血管形成是湿性年龄相关性黄斑变性(AMD)、增生性糖尿病视网膜病变、类风湿性关节炎、骨关节炎和哮喘之类疾病的关键因素。其还在肿瘤生长和扩散中起到重要作用。通过促血管新生和抗血管新生因子的精妙平衡调节新血管形成。
血管内皮生长因子(VEGF)已知对于新血管形成是必须的。在AMD、关节炎的动物模型中和在各种肿瘤模型中,VEGF活性的抑制已证明抑制了新血管形成。用于抑制VEGF活性的方法包括抗体、受体融合蛋白、肽和小分子。
VEGF-R1(Flt-1)和VEGF-R2(KDR)蛋白质已证明以高亲合力结合VEGF。Flt-1和KDR在其细胞外区域中均具有7个Ig样结构域。结构域2已经证明对于VEGF结合是必不可少的。全长可溶受体(结构域1-7)和结构域1-3各自与IgG Fc的融合有效地结合VEGF。但是,IgG Fc仅与Ig样结构域2融合不能结合VEGF,Ig样结构域1和2的组合也是如此。Davis-Smyth,1996。因此,对于有效的VEGF结合,除结构域2外,似乎还需要Ig样结构域1和3。
发明内容
根据本发明的一个实施方案,提供融合蛋白。融合蛋白具有式X-Y-Z。X包含选自细胞外受体、抗体可变区、细胞因子、趋化因子或生长因子的多肽。Y基本由5-25氨基酸残基多肽构成。Z是IgG重链分子的CH3区。
本发明的另一实施方案是式X-Y-Z的多肽。X包含选自细胞外受体、抗体可变区、细胞因子、趋化因子或生长因子的多肽。Y基本由提供5-25氨基酸残基的空间隔离(spatial separation)的连接体部分构成。Z是IgG重链分子的CH3区。
本发明的再一方面是式X-Y-Z的融合蛋白。X包含选自细胞外受体、抗体可变区、细胞因子、趋化因子或生长因子的多肽。Y基本由5-25氨基酸残基多肽构成。Z是抗体分子的Fc部分。
还提供了式X-Y-Z的融合蛋白。X包含选自细胞外受体、抗体可变区、细胞因子、趋化因子或生长因子的多肽。Y基本由提供5-25氨基酸残基的空间隔离的连接体部分构成。Z是抗体分子的Fc部分。
本发明的再一方面是使多肽X多聚的方法。多肽X通过多肽Y连接到多肽Z上以形成多肽XYZ。X包含选自细胞外受体、抗体可变区、细胞因子、趋化因子或生长因子的多肽。Y基本由5-25氨基酸残基多肽构成。Z是IgG重链分子的CH3区。形成的多肽XYZ多聚(multimerizes)。
本发明的再一实施方案提供了使多肽X多聚的方法。多肽X通过Y部分连接到多肽Z上以形成聚合物XYZ。X包含选自细胞外受体、抗体可变区、细胞因子、趋化因子和生长因子的多肽。Y基本由提供5-25氨基酸残基的空间隔离的连接体部分构成。Z是IgG重链分子的CH3区。如此形成的多肽XYZ多聚。
在本发明的一个实施方案中,提供了核酸分子。该核酸分子编码包含VEGF-R1(Flt-1)的Ig样结构域2、连接体和多聚结构域的融合蛋白。该融合蛋白包含选自SEQ ID NO:2、8、21、23或25的序列。
在本发明的另一实施方案中,提供了融合蛋白。该融合蛋白包含VEGF-R1(Flt-1)的Ig样结构域2、连接体和多聚结构域。该融合蛋白包含选自SEQ ID NO:2、8、21、23或25的序列。
在本发明的另一实施方案中,提供了体外方法。将核酸分子输送到分离的哺乳动物细胞中。该核酸分子编码包含VEGF-R1(Flt-1)的Ig样结构域2、连接体或多聚结构域的融合蛋白。该融合蛋白包含选自SEQ ID NO:2、8、21、23或25的序列。通过启动子控制融合蛋白的表达。形成表达融合蛋白的细胞。
本发明的再一实施方案是将融合蛋白输送给哺乳动物的方法。将表达融合蛋白的哺乳动物细胞输送给哺乳动物。细胞表达并分泌融合蛋白,由此将融合蛋白供应给哺乳动物。该融合蛋白包含VEGF-R1(Flt-1)的Ig样结构域2、连接体和多聚结构域。该融合蛋白包含选自SEQ ID NO:2、8、21、23或25的序列。
本发明的另一方面是向哺乳动物供应融合蛋白的方法。将包含VEGF-R1(Flt-1)的Ig样结构域2、连接体和多聚结构域的融合蛋白输送给哺乳动物。该融合蛋白包含选自SEQ ID NO:2、8、21、23或25的序列。或者,可以将编码所述融合蛋白的核酸构建体输送给哺乳动物,由此使哺乳动物表达该融合蛋白。
下面更详细描述的本发明的这些和其他实施方案为本领域提供治疗与血管增生和炎症有关的疾病的方法和试剂。这些试剂提供了相对于蛋白质天然形式的稳定性和生物利用率。
附图说明
图1.D2-9Gly-Fc构建体中9-Gly连接体的柔韧(flexible)区域。通过Karpus和Schultz(1985)法所预测的相对柔韧性表明,与不含9-Gly连接体的D2-Fc构建体相比,D2-9Gly-Fc蛋白中的多聚甘氨酸9-mer(9-Gly)连接体(aa94至103)是柔韧性高于平均水平(>1)的区域。这两种融合蛋白均含有相同的封在框中的氨基酸序列:sp-信号肽(aa-24至-1)、Flt-1结构域2(aa1至93)和IgG1-Fc残基(244aa)。箭头代表使用SignalP V2.0程序(Nielsen等,1997)预测的信号肽酶裂解位点。
图2.D2-9Gly-Fc vs.D2-Fc的生物活性。293细胞在饥饿培养基(starvation media)(M199+5%FCS)中生长并在CMV启动子的控制下用含有D2-9Gly-Fc和D2-Fc表达盒的质粒转染。72小时后收集条件培养基(CM)。将HUVECs种入含有饥饿培养基+VEGF(10纳克/毫升)种96孔板(2E3细胞/孔),并在24小时后加入50微升CM加VEGF(10纳克/毫升)。来自对照pEGFP(Clontech;pEGFP带有野生型绿色荧光蛋白(GFP)的红移变体,其经过最优化以获得更亮的荧光和在哺乳动物细胞中更高的表达)质粒转染的对照物(+/-VEGF)在CM中培养。阳性对照用50纳克Flt-1-IgG重组蛋白(R&D Systems)处理。使用AQueous试剂(Promega)检测HUVECs在处理后3天的增殖。数据是各分三份检测的两个实验的OD490平均值的平均数。
图3.D2-9Gly-Fc和D2-Fc的免疫印迹分析。D2-9Gly-Fc和D2-Fc蛋白的尺寸在非还原性凝胶中迁移时均为在还原性凝胶中迁移时的两倍大。蛋白质载自在表达D2-9Gly-Fc和D2-Fc质粒的293细胞转染后的条件培养基,通过SDS-电泳分离并转移到PVDF膜上。用山羊抗人抗-IgG1Fc和兔抗山羊IgG-HRP抗体探测印迹。
图4.含有9Gly连接体和VEGF Ex3的sFlt-1杂交蛋白质。D2-9Gly-Ex3/CH3与之前构建的蛋白质的结构对比。所有三种蛋白质均含有Flt-1结构域2的相同氨基酸序列,由Flt-1信号肽的24aa和Flt-1结构域2的93aa构成。D2-9Gly-Ex3/CH3含有9Gly连接体的9aa、VEGFEx3的14aa和人IgG1重链Fc的CH3区的120aa。
图5.D2-9Gly-Ex3/CH3vs.D2-9Gly-Fc的生物活性。蛋白质D2-9Gly-Ex3/CH3(其中结构域2通过9Gly连接体连接到CH3区和VEGF Ex3上)与对照蛋白D2-9Gly-Fc和D2-Fc相比,也有效抑制了VEGF依赖型HUVECs增殖。使用50纳克重组Flt-1-IgG(R&D Systems)作为对照物。
图6.比较D2-(Gly4Ser)3-Fc蛋白质活性与D2-9Gly-Fc和D2-9Gly-Ex3/CH3的HUVECs增殖检测。
图7.免疫印迹。来自用表达(1):D2-9Gly-Fc;(2):D2-(G4S)3-Fc和(3)-EGFP蛋白质的质粒转染293细胞的条件培养基(15微升CM)的蛋白质(未还原和还原)通过SDS-电泳分离并转移到PVDF膜上。用山羊抗人IgG1Fc和兔抗山羊IgG-HRP抗体探测印迹。
图8.含/不含9Gly连接体或VEGF Ex3的蛋白质组合。三种含或不含9Gly连接体和/或VEGF Ex3、D2-9Gly-CH3、D2-CH3和D2-Ex3/CH3的新型蛋白质的结构比较。
图9.用带有9Gly、Ex3和CH3组合的Flt-1(D2)构建体进行的HUVECs增殖检测。将来自293细胞的含有蛋白质D2-Ex3/CH3、D2-9Gly-CH3和D2-CH3的条件培养基(5微升)与D2-9Gly-Fc和D2-9Gly-Ex3/CH3进行比较。
图10.免疫印迹。用表达(1):D2-9Gly-Fc;(2):D2-9Gly-CH3(52/26kDa)和(3)D2-CH3(50/25kDa)的质粒转染293细胞。将来自293细胞条件培养基(15微升CM,未还原和/或还原)的蛋白质通过SDS-电泳分离并转移到PVDF膜上。用抗-人VEGF-R1HRP结合物(conjugate)(R&D Systems)探测印迹。
图11.VEGF“体外”结合检测。将含有已知浓度的D2-9Gly-Fc和Flt-1D(1-3)对照可溶受体(浓度为0.29-150pM)的来自293细胞的条件培养基连续稀释并用10pM VEGF混合。然后通过ELISA测量未结合的VEGF的量。D2-9Gly-Fc以比所有其他构建体高的亲合力结合VEGF。“n”代表独立实验(转染和结合检测)的数量。
图12.用BIAcore仪器通过表面等离子体共振测量可溶Flt-1构建体的结合动力。将sFlt-1构建体固定到传感器芯片上,并以0.2至1.5nM的浓度注射VEGF165。使用BIA Evaluation程序评测sensorgrams,测定速率常数Ka和Kd,并由Kd/Ka=KD的比率计算离解常数(KD)。越低的KD值意味着越好的亲合力。
图13A-13C.图13A显示含有各种连接体的Flt-1构建体的表达水平。图13B显示了含有各种连接体和IgG1的Fc的CH3部分的Flt-1构建体的二聚或多聚。未还原和还原条件之间的差异表明,蛋白质已经多聚。图13C显示了在存在VEGF的HUVEC增殖检测中在条件培养基中存在的所示Flt-1构建体的抑制生物活性。每一构建体均表现出与HUVEC在不存在VEGF情况下的增殖水平接近的抑制活性。
图14.使用视网膜血管新生(NV)的氧诱导视网膜病变(OIR)鼠科模型,对鼠眼施加Flt-1构建体之一,并测定新血管形成。使鼠暴露在含氧量高的条件下。测定处理过的眼中的新生血管事件数,与相同动物的未处理过的眼中的事件数进行比较。如果新生血管事件数降低了50%以上,该动物就被视为“反应者”。
具体实施方式
本发明人发现,Flt-1Ig样结构域2在没有结构域1和3的情况下能够有效结合VEGF并抑制VEGF依赖型内皮细胞增殖。结构域2可以通过连接体共价连接到多聚结构域上。连接体通常是多肽链。链长可以为6、7、9、11、13、15个或更多氨基酸残基,但通常为5至25个残基。根据长度和侧链组成,连接体可以但不需要具有大于平均水平的柔韧性。柔韧性可以使用本领域已知的运算法计算。多聚结构域是多聚蛋白质的促进亚单位结合形成例如二聚体、三聚体、四聚体等等的那些部分。适用于有效结合VEGF和/或抑制VEGF依赖型内皮细胞增殖的重组蛋白选自SEQ ID NO:2、8、21、23或25。
此外,本发明人已经发现,多聚结构域和连接体可以与各种其他蛋白质或蛋白质部分一起使用以引发多聚。这类蛋白质可以是仅在多聚时结合到配体或受体上的蛋白质,或可以是在多聚时提高其结合亲合力的蛋白质。适合多聚的蛋白质包括细胞外受体(包括其部分)、抗体可变区、细胞因子、趋化因子和生长因子。适合的蛋白质包括酪氨酸激酶受体和丝氨酸苏氨酸激酶受体。细胞外受体的具体例子包括EGF-受体、G蛋白偶联受体、FGF受体、Fc受体、T细胞受体等。抗体可变区的例子包括Fab、F(ab’)2和ScFv。细胞因子的例子包括GM-CSF、IL-1α、IL-1β、IL-2、IL-3、IL-4、IL-5、IL-6、IL-7、IL-8、IL-10、IL-12、IL-18、IL-21、IL-23、IFN-α、IFN-β、IFN-γ、MIP-1α、MIP-1β、TGF-β、TNFα和TNF-β。趋化因子的例子包括BCA-1/BLC、BRAK、趋化因子CC-2、CTACK、CXCL-16、ELC、ENA、ENA-70、ENA-74、ENA-78、Eotaxin、Exodus-2、Fractalkine、GCP-2、GRO、GROα(MGSA)、GRO-β、GRO-γ、HCC-1、HCC-4、I-309、IP-10、I-TAC、LAG-1、LD78-β、LEC/NCC-4、LL-37、淋巴细胞趋化因子(Lymphotactin)、MCP、MCAF(MCP-1)、MCP-2、MCP-3、MCP-4、MDC、MDC、MDC-2、MDC-4、MEC/CCL28、MIG、MIP、MIP-1α、MIP-1β、MIP-1δ、MIP-3/MPIF-1、MIP-3α、MIP-3bet、MIP-4(PARC)、MIP-5、NAP-2、PARC、PF-4、RANTES、RANTES-2、SDF-1α、SDF-1β、TARC和TECK。生长因子的例子包括人双调蛋白、人血管生成蛋白、人ACE、人血管生成素(Angiogenin)、人促血管生成素(Angiopoietin)、人血管抑制素(angiostatin)、人β细胞素(betacellulin)、人BMP、人BMP-13/CDMP-2、人BMP-14/CDMP-1、人BMP-2、人BMP-3、人BMP-4、人BMP-5、人BMP-6、人BMP-7、人BMP-8、人BMP-9、人集落刺激因子、人flt-3-配体、人G-CSF、人GM-CSF、人M-CSF、人结缔组织生长因子、人cripto-1、人cryptic、人ECGF、人EGF、人EG-VEGF、人促红细胞生成素、人胎球蛋白、人FGF、人FGF-1、人FGF-10、人FGF-16、人FGF-17、人FGF-18、人FGF-19、人FGF-2、人FGF-20、人FGF-3、人FGF-4、人FGF-5、人FGF-6、人FGF-7/KGF、人FGF-8、人FGF-9、人酸性FGF(acidic)、人碱性FGF(basic)、人GDF-11、人GDF-15、人生长激素释放因子、人HB-EGF、人Heregulin、人HGF、人IGF、人IGF-I、人IGF-II、人抑制素、人KGF、人LCGF、人LIF、人混合生长因子(Miscellaneous Growth Factors)、人MSP、人肌肉生长抑制素(Myostatin)、人肌肉生长抑制素前肽、人神经生长因子、人制瘤素M、人PD-ECGF、人PDGF、人PDGF(AA同型二聚体)、人PDGF(AB异型二聚体)、人PDGF(BB同型二聚体)、人PDGF(CC同型二聚体)、人PIGF、人PIGF、人PIGF-1、人PIGF-2、人SCF、人SMDF、人干细胞生长因子、人SCGF-α、人SCGF-β、人血小板生成素、人转化生长因子、人TGF-α、人TGF-β和人VEGF。
Flt-1受体蛋白具有包含7个Ig样结构域的细胞外部分。这些位于Genbank接受号(accession no.)P17948的残基号32...123、151...214、230...327、335...421、428...553、556...654和661...747,也参见SEQ IDNO:15。残基号1-26包含信号序列。用Genbank接受号NM_002019(SEQ ID NO:14)所示的DNA序列编码Flt-1蛋白。
可以如本领域已知的那样使用多聚结构域。可以使用IgG1或IgG2λ重链的Fc部分的序列,例如单独使用CH3(aa371-477)或一起使用CH2和CH3域(aa247-477)。Ig分子的Fc部分是通过用木瓜蛋白酶裂解整个抗体分子而得的。可以使用其他方式获得这些部分。对于IgG1λ重链蛋白质序列,参见Genbank accession no Y14737和SEQ ID NO:10。可以使用例如来自其他IgG类型和来自IgA、IgM、IgD或IgE抗体的其他Fc区域。也可以使用VEGF的多聚区域。编码VEGF的DNA序列显示在Genbank接受号NM_003376和SEQ ID NO:11中。VEGF的氨基酸序列显示在Genbank接受号CAC19513和SEQ ID NO:12中。VEGF外显子3(VEGF Ex3)编码的VEGF的多聚区域(SEQ ID NO:13)大致位于VEGF蛋白质的氨基酸残基75-88处(SEQ ID NO:12)。多聚结构域会导致至少5%、10%、20%、30%、40%、50%、60%、75%、80%、85%、90%或95%的单体融合蛋白在非变性聚丙烯酰胺凝胶上以适合多聚体的速率迁移。糖基化可以影响蛋白质在凝胶中的迁移。尽管在此列出了特定序列,但也可以使用等位变体之类的变体。通常,这些变体与所公开的序列具有至少85%、90%、95%、97%、98%或99%的同一性。
如本文所示,可以例如使用还原和非还原性凝胶检验多聚。还可以通过检测蛋白质对其配体/受体提高的结合亲合力来检验多聚。在这方面可以使用BiaCoreTM表面等离子体共振检验。这些检验法通过测量接近传感器芯片表面的水层中折射率的变化来检测质量变化。可以使用本领域已知的任何方法来检测多聚。
本发明的连接体部分可以包含例如5-100氨基酸残基、5-75氨基酸残基、5-50氨基酸残基、5-25氨基酸残基、5-20氨基酸残基、5-15氨基酸残基、5-10氨基酸残基、5-9氨基酸残基。可用连接体的例子包括:gly9(SEQ ID NO:27)、glu9(SEQ ID NO:28)、ser9(SEQ ID NO:29)、gly5cyspro2cys(SEQ ID NO:30)、(gly4ser)3(SEQ ID NO:31)、SerCysValProLeuMetArgCysGlyGlyCysCysAsn(SEQ ID NO:32)、Pro SerCys Val Pro Leu Met Arg Cys Gly Gly Cys Cys Asn(SEQ ID NO:13)、GlyAsp Leu Ile Tyr Arg Asn Gln Lys(SEQ ID NO:26)和Gly9ProSerCysValProLeuMetArgCysGlyGlyCysCysAsn(SEQ ID NO:34)。可用的其他多肽连接体包括不同长度,包括5、7或30个残基的多聚甘氨酸。此外,可以使用Flt-1的其他部分作为连接体,例如Flt-1的结构域3。参见SEQ ID NO:15。连接体部分还可以由其他聚合物,例如聚乙二醇制成。这类连接体可以具有10至1000、10-500、10-250、10-100或10-50个乙二醇单体单元。合适的聚合物应该具有与被适当范围的氨基酸残基占据的尺寸类似的尺寸。典型大小的聚合物提供大约10-25埃的间隔。
本发明的融合蛋白可以通过本领域已知的任何方法制造。尽管这些蛋白质可以合成,或通过连接制成的部分制造,也可以使用重组制造。融合基因序列可以使用重组DNA的标准工具制造。融合基因序列可以被插入载体,例如病毒或质粒载体,以复制融合基因序列。可以在融合基因序列的上游引入在最终受体细胞中有作用的启动子序列。所用启动子可以是组成型的(constitutive)、可诱导的或可抑制的。每一类型的例子是本领域中公知的。载体可以通过本领域已知的任何方式引入宿主细胞或哺乳动物。可用的合适的载体包括腺病毒、腺相关病毒、反转录病毒、慢病毒或质粒。如果载体在病毒载体中且载体已经包装(packaged),则可以使用病毒粒子传染细胞。如果使用裸DNA,则可以使用适合特定宿主细胞的转染或转化程序。采用聚合物、脂质体或纳米球(nanospheres)的裸DNA制剂可用于融合基因输送。可以用本发明的重组构建体转化或转染的细胞可以是对技术人员而言方便的任何细胞。可用的示例性细胞类型包括细菌、酵母、昆虫和哺乳动物细胞。在哺乳动物细胞中,可以视方便选择许多组织类型的细胞。可用的示例性细胞是成纤维细胞、肝细胞、内皮细胞、干细胞、造血细胞、上皮细胞、肌细胞、神经元细胞和角质形成细胞。这些细胞可用于在体外制造蛋白质,或可以输送给包括人类在内的哺乳动物以在体内制造编码蛋白。这种输送手段是向哺乳动物输送核酸、向哺乳动物输送病毒载体和向哺乳动物输送融合蛋白的替代形式。
蛋白质或核酸的组合物可以在载体中,例如缓冲剂、水性或亲脂载体、消毒或未消毒、热源(pyrogenic)或未热源载体。未热源载体可用于可注射配方。配方可以是液体或固体,例如冻干的。配方还可以以气溶胶形式施用。组合物可以包含一种或多种融合蛋白或一种或多种核酸,或即包含融合蛋白又包含核酸。组合物中的融合蛋白和/或核酸可以是同源的,在这种情况下会形成同源多聚体(homomultimer)蛋白质,或它们在组合物中是异源的,在这种情况下会形成异源多聚体(heteromultimer)蛋白质。在异源多聚体的情况下,融合蛋白之间的X部分不同,但融合蛋白之间的Z部分相同。
可以通过本领域已知的任何方式向细胞或哺乳动物宿主提供融合蛋白。可以将蛋白质输送(delivered)到细胞或宿主中,可以将核酸施用(administered)到细胞或宿主上。可以将转化或转染细胞施用到细胞或宿主上。在后一种情况下,需要相同遗传背景的细胞以降低移植排异。
适用于输送给哺乳动物宿主动物的细胞包括来自任何器官、肿瘤或细胞系的任何哺乳动物细胞类型。例如,可以使用人、鼠、山羊、绵羊、牛、狗、猫和猪的细胞。适用的细胞类型包括,但不限于,成纤维细胞、肝细胞、内皮细胞、角质形成细胞、造血细胞、上皮细胞、肌细胞、神经元细胞和干细胞。
融合蛋白或编码融合蛋白的核酸的输送方式包括表达融合蛋白的细胞的输送、融合蛋白的输送、和编码融合蛋白的核酸的输送。融合蛋白、细胞或核酸可以通过例如注射、导管插入或内窥镜检查直接输送给所需器官或肿瘤。它们也可以静脉内、支气管内、肿瘤内(intra-tumorally)、鞘内、肌肉内、眼内、局部、皮下、透皮或经口输送。可获得有效治疗的患者包括患有湿性年龄相关性黄斑变性、增生性糖尿病视网膜病变、类风湿性关节炎、骨关节炎、葡萄膜炎、哮喘和癌症的患者。治疗会改善症状和/或疾病标记和/或疾病严重性。
核酸可以在任何所需载体中输送给哺乳动物,特别是人类。这些包括病毒的或非病毒的载体,包括腺病毒载体、腺相关病毒载体、反转录病毒载体、慢病毒载体和质粒载体。病毒的示例性类型包括HSV(单纯疱疹病毒)、腺病毒、AAV(腺相关病毒)、HIV(人类免疫缺陷性病毒)、BIV(牛免疫缺陷性病毒)和MLV(鼠白血病病毒)。核酸可以以提供足够有效的输送水平的任何所需形式施用,包括在病毒粒子中、在脂质体中、在纳米粒子中和络合到聚合物上。
可以结合使用蛋白质、核酸联合治疗。例如,可以向患者施用本发明的融合蛋白。如果观察到有利的响应,就可以施用编码融合蛋白的核酸分子以获得长期作用。或者,可以同时或几乎同时施用蛋白质和核酸。在另一选择中,可以在施用对配体的抗体或融合蛋白之后或相伴地,施用对受体的抗体或融合配偶体(partner)。
另一选择是使用核酸组合(combination),其中一种核酸编码抗体,另一种编码融合蛋白。可以与本发明的Flt-1构建体(无论是蛋白质还是核酸形式)结合使用的一些抗体是贝伐单抗(bevacizumab)和ranibizumab,两者均针对VEGF。这些分别特别可用于治疗癌症和黄斑变性。
除非另行说明,本发明的实践使用在本领域技术范围内的分子生物学(包括重组技术)、微生物学、细胞生物学、生物化学和免疫学的传统技术。在文献中充分解释了这类技术,例如,Molecular Cloning:ALaboratory Manual,Second Edition(Sambrook等,1989);CurrentProtocols In Molecular Biology(F.M.Ausubel等,eds.,1987);Oligonucleotide Synthesis(M.J.Gait.,ed.,1984);Animal Cell Culture(R.I.Freshney,ed.,1987);Methods In Enzymology(Academic Press,Inc.);Handbook Of Experimental Immunology(D.M.Wei&C.C.Blackwell,eds.);Gene Transfer Vectors For Mammalian Cells(J.M.Miller&M.P.Calos,eds.,1987);PCR:The Polymerase Chain Reaction(Mullis等,eds.,1994);Current Protocols In Immunology(J.E.Coligan等,eds.,1991);Antibodies:A Laboratory Manual(E.Harlow与D.Lane,eds.(1988));和PCR2:APractical Approach(M.J.MacPherson,B.D.Hames和G.R.Taylor eds.(1995))。
基因输送载体是可以将插入的多聚核苷酸带入宿主细胞的任何分子。基因输送载体的例子是脂质体、生物相容性聚合物,包括天然聚合物和合成聚合物;脂蛋白;多肽;多糖;脂多糖;人造病毒外壳(artificial viral envelopes);金属粒子和细菌、病毒,例如杆状病毒、腺病毒和反转录病毒,噬菌体、粘粒、质粒、真菌载体和本领域通常使用的其它重组载体,它们已经被描述成用于在各种真核和原核宿主中表达,并可用于基因治疗以及用于简单蛋白质表达。
本文所用的基因输送、基因转移之类的术语是指将外源多聚核苷酸(有时称作“转基因(transgene)”)引入宿主细胞,不管引入方法如何。这类方法包括各种公知技术,例如载体介导基因转移(通过,例如,病毒感染/转染,或各种其他基于蛋白质或基于脂质的基因输送复合物)以及促进“裸”多聚核苷酸输送的技术(例如电穿孔、“基因枪”输送和用于引入多聚核苷酸的各种其他技术)。引入的多聚核苷酸可以稳定地或短暂地保持在宿主细胞中。稳定保持通常要求引入的多聚核苷酸含有与宿主细胞相容的复制原点或整合到宿主细胞的复制子中,例如染色体外复制子(例如质粒)或核的或线粒体的染色体中。如本领域已知和本文所述的那样,许多载体已知能够介导基因转移到哺乳动物细胞中。
将外源多聚核苷酸插入载体,例如腺病毒、部分缺失的腺病毒、完全缺失的腺病毒、腺相关病毒(AAV)、反转录病毒、慢病毒、裸质粒、质粒/脂质体复合物等等,以经静脉内、肌肉内、门静脉(intraportal)内或其它施用途径输送给宿主。在本发明的方法和组合物中可用的表达载体包括,例如,病毒载体。最常用的基因治疗施用方法之一(体内和体外),是使用用于基因输送的病毒载体。许多类型的病毒是已知的,且许多已经研究用于基因治疗用途。最常用的病毒载体包括衍生自腺病毒、腺相关病毒(AAV)和反转录病毒,包括慢病毒,例如人类免疫缺陷性病毒(HIV)的那些。
腺病毒是具有大约36kb基因组的未包膜(non-enveloped)的核DNA病毒,其已经通过在经典遗传学和分子生物学中的研究来充分表征(Hurwitz,M.S.,Adenoviruses Virology,3rd edition,Fields等,eds.,Raven Press,New York,1996;Hitt,M.M.等,Adenovirus Vectors,TheDevelopment of Human Gene Therapy,Friedman,T.ed.,Cold SpringHarbor Laboratory Press,New York1999)。将病毒基因分类成早期(名为E1-E4)和晚期(名为L1-L5)转录单元,这是指病毒蛋白的两个时间段(temporal classes)分类的产生。这些事件的分界线是病毒DNA复制。根据包括血红细胞的凝集、致瘤性、DNA和蛋白质氨基酸组成和同源性、和抗原关系在内的性质,将人类腺病毒被划分成许多血清型(大约47,相应地编号并分成6类:A、B、C、D、E和F)。
重组腺病毒载体对于用作基因输送载体具有一些优点,包括对分裂和未分裂细胞的向性、最小致病可能、复制至高滴定度以制备载体原料的能力,和携带大插入物的能力(Berkner,K.L,Curr.Top.Micro.Immunol.158:39-66,1992;Jolly,D.,Cancer Gene Therapy1:51-641994)。具有各种腺病毒基因序列缺失的腺病毒载体,例如假腺病毒(pseudoadenoviral)载体(PAVs)和部分缺失的腺病毒(被称作“DeAd”)经过设计以利用腺病毒的合意特征,这使其成为适用于将核酸输送给受体细胞的载体。
特别地,也被称作“空壳腺病毒(gutless adenovirus)”或“微小腺病毒(mini-adenoviral)”载体的假腺病毒载体(PAVs),是由含有载体基因组的复制和包装(packaging)所需的最小顺式作用核苷酸序列和可以含有一个或多个转基因的腺病毒基因组衍生成的腺病毒载体(参见,美国专利5,882,877,其涵盖假腺病毒载体(PAV)和制造PAV的方法,作为参考并入本文)。PAVs经过设计以利用腺病毒的合意特征,这使其成为适用于基因输送的载体。尽管腺病毒载体通常可以通过删除对病毒生长而言不必要的区域而带有最多8kb大小的插入物,但可以使用含有多数病毒编码序列包括PAVs的缺失的腺病毒载体,实现最大承载能力。参见Gregory等人的美国专利5,882,877;Kochanek等人,Proc.Natl.Acad.Sci.USA93:5731-5736,1996;Parks等,Proc.Natl.Acad.Sci.USA93:13565-13570,1996;Lieber等人,J.Virol.70:8944-8960,1996;Fisher等人,Virology217:11-22,1996;美国专利5,670,488;1996年10月24日公开的PCT申请公开WO96/33280;1996年12月19日公开的PCT申请公开WO96/40955;1997年7月19日公开的PCT申请公开WO97/25446;1995年11月9日公开的PCT申请公开WO95/29993;1997年1月3日公开的PCT申请公开WO97/00326;Morral等人,Hum.Gene Ther.10:2709-2716,1998。可以容纳最多大约36kb外来核酸的这种PAVs是有利的,因为载体的承载能力最优化,同时降低宿主对载体的免疫响应可能或有复制能力的(replication-competent)病毒的生成。PAV载体含有5’反向末端重复(ITR)和含有复制原点的3’ITR核苷酸序列,和PAV基因组的包装所需的顺式作用核苷酸序列,并可以容纳一个或多个带有适当的调节元件(例如启动子、增强子等等)的转基因。
其他部分缺失的腺病毒载体提供了部分缺失的腺病毒(被称作“DeAd”)载体——其中从载体中删除病毒复制所需的大部分腺病毒早期基因并在条件启动子的控制下置于生产(producer)细胞染色体内。置于生产细胞中的可删除腺病毒基因可以包括E1A/E1B、E2、E4(仅需要将ORF6和ORF6/7置入细胞中)、pIX和pIVa2。也可以从载体中删除E3,但因为这对于载体制造不是必须的,这可以从生产细胞中省略。腺病毒晚期基因,通常在主要晚期启动子(MLP)的控制下,存在于载体中,但MLP可以被条件启动子取代。
适合用在DeAd载体和生产细胞系中的条件启动子包括具有下列特征的那些:在未诱导状态下的低基本表达,从而不以对细胞有害的程度表达细胞毒性或细胞抑制性腺病毒基因;在诱导状态下的高水平表达,从而制造足够量的病毒蛋白以支持载体复制和装配。适用在DeAd载体和生产细胞系中的优选条件启动子包括以免疫抑制剂FK506和雷帕霉素为基础的二聚体基因控制体系,蜕皮激素基因控制体系和四环素基因控制系统。同样可用于本发明的是在Abruzzese等人,Hum.Gene Ther.199910:1499-507中描述的GeneSwitchTM技术(Valentis,Inc.,Woodlands,TX),其公开的内容作为参考并入本文。在WO99/57296中进一步描述了部分缺失的腺病毒表达系统,其公开的内容作为参考并入本文。
腺相关病毒(AAV)是基因组大小为4.6kb的单链人类DNA细小病毒。AAV基因组含有两种主要基因:编码rep蛋白质(Rep76、Rep68、Rep52和Rep40)的rep基因,和编码AAV复制、恢复(rescue)、转录和整合(integration)的cap基因,同时cap蛋白质形成AAV病毒粒子。AAV的名字源自其对腺病毒或其他辅助病毒(例如疱疹病毒)的依赖性以供应允许AAV经历生产性感染(即在宿主细胞中自我复制)的必需基因产品。在不存在辅助病毒时,AAV作为前病毒整合到宿主细胞的染色体中,直至通过辅助病毒(通常腺病毒)对宿主细胞的重复感染将其恢复(rescue)(Muzyczka,Curr.Top.Micor.Immunol.158:97-127,1992)。
AVV作为基因转移载体的重要性来自其生物学的一些独特特征。在AAV基因组的两个末端均有被称作反向末端重复(ITR)的核苷酸序列,其含有病毒复制、恢复、包装和整合所需的顺式作用核苷酸序列。反式下的rep蛋白质介导的ITR整合作用能够使AAV基因组在不存在辅助病毒的情况下整合到感染后的细胞染色体中。病毒的这种独特性质与AVV在基因转移中的使用有关,因为其允许含有相关基因的重组AAV整合到细胞染色体中。因此,可以使用rAAV载体实现对基因转移的许多目标而言理想的稳定基因转化。此外,AAV用的整合位点是非常确定的并定位于人类的染色体19(Kotin等,Proc.Natl.Acad.Sci.87:2211-2215,1990)。整合位点的这种可预测性降低了任意插入细胞基因组中的危险,这可能激活或钝化宿主基因或打断编码序列,结果可能限制了载体的应用——其中AVV的整合、在rAAV载体设计中这种基因的去除可能导致使用rAAV载体已经观察到的改变的整合模式(Ponnazhagan等人,Hum Gene Ther.8:275-284,1997)。
使用AAV进行基因转移具有其他优点。AAV的宿主范围很宽。此外,与逆转录病毒不同,AAV可以感染休眠和分裂细胞。此外,AAV尚未与人类疾病联系在一起,这消除了使用逆转录病毒衍生基因转移载体引起的许多顾虑。
重组rAAV载体生成的标准方法要求一系列细胞内事件的配合:用含有在侧面与AAV ITR序列相接的所需转基因的rAAV载体基因组转染宿主细胞,通过编码反向(in trans)所需的AAV rep和cap蛋白质基因的质粒转染宿主细胞,和用辅助病毒感染转染细胞以提供intrans所需的非AAV辅助功能(Muzyczka,N.,Curr.Top.Micor.Immunol.158:97-129,1992)。腺病毒(或其他辅助病毒)蛋白质激活AAV rep基因的转录,而rep蛋白质随后激活AAV cap基因的转录。Cap蛋白质随后利用ITR序列将rAAV基因组包入rAAV病毒粒子。因此,足量结构蛋白质的可得性以及rAAV载体基因组所需的任何顺式作用包装(packaging)序列的可达性(accessibility)部分决定包装效率。
逆转录病毒载体是基因输送的常用工具(Miller,Nature(1992)357:455-460)。逆转录病毒载体将非重新排列的单副本基因输送到多种啮齿动物、灵长动物和人类体细胞中的能力使逆转录病毒载体非常适合将基因转移到细胞中。
逆转录病毒是RNA病毒,其中病毒基因组是RNA。当用逆转录病毒感染宿主细胞时,将基因组RNA逆转录为非常有效地整合到受感染细胞的染色体DNA中的DNA中间体。这种整合的DNA中间体被称作前病毒。前病毒的转录和装配为传染性病毒,在存在适当辅助病毒的情况下或在含有能够在不同时产生污染辅助病毒的情况下实现壳体化的适当序列的细胞系中发生。如果通过与适当载体的共转染提供用于壳体化的序列,重组逆转录病毒的制造就不需要辅助病毒。
逆转录病毒基因组和前病毒DNA具有三种基因:gag、pol和env,其两侧是两个长末端重复(LTR)序列。gag基因编码内部结构(基质、衣壳和核壳体)蛋白;pol基因编码RNA指导的DNA聚合酶(逆转录酶),env基因编码病毒包膜糖蛋白。5’和3’LTRs用以促进病毒粒子RNAs的转录和多聚腺苷酸化。LTR含有病毒复制所需的所有其他顺式作用序列。慢病毒具有附加的基因,包括vit vpr、tat、rev、vpu、nef和vpx(在HIV-1、HIV-2和/或SIV中)。与5’LTR相邻的是基因组的逆转录(tRNA引物结合位点)和病毒RNA有效壳体化到粒子中(Psi位点)所必须的序列。如果壳体化(或逆转录病毒RNA包装到传染性病毒粒子中)所必须的序列从病毒基因组中丢失,结果是防止基因组RNA壳体化的顺式缺陷。但是,所得突变体仍然能够指导所有varion蛋白质的合成。
慢病毒(lentiviruses)是复合逆转录病毒,其除了普通逆转录病毒基因gag、pol和env外还含有具有调节或结构功能的其他基因。在潜伏性感染过程中那样,较高的复杂性能够使慢病毒调节其生存周期。典型的慢病毒是人类免疫缺陷病毒(HIV),AIDS的病原体。在体内,HIV可以感染极少分裂的末端分化细胞,例如淋巴细胞和巨噬细胞。在体外,HIV可以感染单核细胞衍生的巨噬细胞(MDM)以及通过用aphidicolin或γ辐射处理而停滞在细胞周期中的HeLa-Cd4或T淋巴样细胞的原代培养。细胞的感染取决于HIV整合前复合物通过目标细胞的核孔的活性核输入。这通过复合物中的多个部分冗余的分子决定子与目标细胞的核输入系统的相互作用产生。识别出的决定子包括gag基质(MA)蛋白质中的功能性核定位信号(NLS)、亲核(karyophilic)病毒粒子相关蛋白、vpr和gag MA蛋白质中的C-末端磷酸酪氨酸残基。例如,在美国专利6,013,516和美国专利5,994,136中描述了使用反转录病毒进行基因治疗,其公开的内容作为参考并入本文。
向细胞输送DNA的其他方法不使用病毒进行输送。例如,可以使用阳离子两亲化合物输送本发明的核酸。因为用于促进生物活性分子的细胞内输送的化合物必须与非极性和极性环境相互作用(在例如质膜、组织液、细胞内的隔室和生物活性分子本身之中或之上),这类化合物通常被设计成含有极性和非极性结构域。含有这两种结构域的化合物可以被称作两亲物,且已经被公开用于促进这种细胞内输送的许多脂质和合成脂质(无论是用于体外还是体内用途)符合这一定义。这些两亲物的一个特别重要的类型是阳离子型两亲物。一般而言,阳离子型两亲物具有能够在生理pH值下带正电荷的极性基团,这种性质在本领域中被认为在确定两亲物与许多类型的生物活性(治疗性)分子(包括,例如,带负电荷的多聚核苷酸,例如DNA)如何相互作用时是重要的。
在例如美国专利5,049,386;US5,279,833;US5,650,096;US5,747,471;US5,767,099;US5,910,487;US5,719,131;US5,840,710;US5,783,565;US5,925,628;US5,912,239;US5,942,634;US5,948,925;US6,022,874;US5,994,317;US5,861,397;US5,952,916;US5,948,767;US5,939,401和US5,935,936中描述了使用含有阳离子两亲化合物的组合物进行基因输送,其公开的内容作为参考并入本文。
此外,本发明的核酸可以使用“裸DNA”输送。美国专利5,580,859;US5,963,622;US5,910,488描述了在不与转染促进蛋白质、病毒粒子、脂质体制剂、带电脂质和磷酸钙沉淀剂结合的情况下,输送编码所需多肽或可连接到启动子上的肽的非传染性、非整合的DNA序列的方法;其公开的内容作为参考并入本文。
还报道了结合病毒和非病毒成分的基因转移系统。Cristiano等人,(1993)Proc.Natl.Acad.Sci.USA90:11548;Wu等人,(1994)J.Biol.Chem.269:11542;Wagner等人,(1992)Proc.Natl.Acad.Sci.USA89:6099;Yoshimura等人,(1993)J.Biol.Chem.268:2300;Curiel等人,(1991)Proc.Natl.Acad.Sci.USA88:8850;Kupfer等人,(1994)HumanGene Ther.5:1437和Gottschalk等人,(1994)Gene Ther.1:185。在多数情况下,将腺病毒并入基因输送系统以利用其溶内体(endosomolytic)性质。所报道的病毒和非病毒成分的组合通常涉及腺病毒共价连接到基因输送复合物上或未结合的腺病毒与阳离子型脂质:DNA复合物的共同内在化(co-internalization)。
为了向眼输送DNA和蛋白质,施用通常是局部的。这具有限制需要施用的DNA量和限制全身副作用的优点。可以使用许多可能的输送方式,包括但不限于:通过基因枪在角膜上局部施用;结膜下注射、前眼房(intracameral)注射、经眼滴到角膜上、通过termporal缘(limbus)注入前房、基质内注射、与电脉冲、角膜内(intracomeal)注射、视网膜下注射、玻璃体内注射和眼内注射结合的角膜应用。或者,细胞可以离体转染或转导并通过眼内植入输送。参见,Auricchio,Mol.Ther.6:490-494,2002;Bennett,Nature Med.2:649-654,1996;Borras,Experimental Eye Research76:643-652,2003;Chaum,Survey ofOphthalmology47:449-469,2002;Campochiaro,Expert OpinionsinBiological Therapy2:537-544(2002);Lai,Gene Therapy9:804-813,2002;Pleyer,ProgressinRetinal and Eye Research,22:277-293,2003。
可以以适用于特定疾病的动物模型测试各种提出的治疗剂和施用方式的效果。例如,可以如Smith,Investigative Ophthalmology&VisualScience,35:101-111,1994中所述,在鼠中的氧诱导视网膜病模型中测试早产儿视网膜病变。可以使用鼠中的激光诱导的脉络膜新生血管作为模型,用于在例如与年龄相关性黄斑变性的疾病中发生人类脉络膜新生血管(CNV)。Tobe,American Journal of Pathology153:1641-1646,1998。已经在灵长动物、大鼠、小种猪和兔子中开发出其他CNV模型。已经在基因缺陷鼠中开发出年龄相关性黄斑变性的鼠模型。缺乏单核细胞趋化蛋白(chemoattractant)蛋白-1或C-C趋化因子受体-2的鼠发展出年龄相关性黄斑变性的特征。Ambati,Nature Med.9:1390-1397,2003。
尽管已经参照具体实施例,包括本发明目前优选的实施方式描述了本发明,但本领域技术人员会认识到,可以在如所述权利要求中所列的本发明的精神和范围内对上述系统和技术进行许多变动和重排。
实施例
实施例1
生成两种构建体:第一种,含有多聚甘氨酸9-mer(9Gly)连接体的D2-9Gly-Fc,第二种,除9Gly连接体外具有相同序列的D2-Fc(图1)。
我们使用序列分析程序Mac Vector6.5.1.(IBI,New Haven,CT)的蛋白质分析工具箱(Protein Analysis Toolbox)分析D2-9Gly-Fc和D2-Fc蛋白质的氨基酸序列。D2-9Gly-Fc序列中的多聚甘氨酸9-mer连接体被确认为是通过Karpus and Schultz(1985)Naturwiss,72:212-213的柔韧性预测方法得出的柔韧性高于平均水平的区域。在D2-Fc序列中没有检出这样的区域(图1)。
实施例2
我们测试了通过柔韧多聚甘氨酸9-mer连接体连接到IgG1 Fc区域上的分离的Flt-1Flt-1Ig样结构域2(D2-9Gly-Fc)。D2-9Gly-Fc融合蛋白能够有效结合VEGF并抑制VEGF依赖型人类脐静脉内皮细胞(HUVEC)增殖。参见图2。相反,当Flt-1Ig样结构域2直接连接到IgG1重链(Fc)上以形成D2-Fc时,仅观察到轻微的VEGF结合。参见图2。通过IgGl Fc的二聚和柔韧连接体的插入似乎促进了VEGF结合到Flt-1结构域2上。通过免疫印迹分析确定D2-9Gly-Fc和D2-Fc中二聚形式的存在。参见图3。
实施例3
对新生的(P0)或1天大(P1)C57BL/6的鼠施用AAV载体(在0.0005毫升体积中1×108至1×109个粒子)的玻璃体内注射液。通过使P7幼畜和它们的看护母畜暴露在高氧中5天,在C57BL/6鼠中引发视网膜血管新生(NV)。使幼畜在P12回到室内空气并在P17安乐死(euthanized)(最高NV的时间)。(Smith LEH,Weslowski E,McLellan A,Kostyk SK,D’Amato R,Sullivan and D’Amore PA.Oxygen-Induced Retinopathy in the Mouse.Invest OpthVisSci.1994;35:101-111.)将整个石蜡包埋的眼以5微米为间隔连续切片。通过在每隔100微米截取的切片中数出在内界膜内部的内皮细胞核数,测定NV程度。
用编码抗血管生成剂的AAV载体处理的动物组与用编码不相关转基因的载体或用不编码转基因的载体处理的组进行比较。将每一处理过的眼中内皮细胞核的平均数与每一动物的未处理的对侧眼进行比较。
实施例4
D2-9Gly-Ex3/CH3的生成
Flt-1的结构域2已经证实对于VEGF165结合是必不可少的。但是,已经证明,Flt-1结构域2单独不能结合VEGF A(Davis-Smyth等人,1996)。VEGF A在作为二聚体存在时,通过酸性残基(成熟蛋白质的氨基酸63-67)结合到Flt-1上,这能够实现配体引发的受体二聚的可行机制(Keyt等人,1996)。
因此,Flt-1的结构域2的二聚被用作恢复Flt-1的结构域2与VEGFA的结合的对策。与IgG重链片段的融合可用于蛋白质的二聚(Davis-Smyth等人,1996)。在此,我们证实,VEGF A(SEQ ID NO:12)的氨基酸75-88(即PSCVPLMRCGGCCN;SEQ ID NO:13)提高了sFlt-1杂交蛋白质的生物活性。
首先,设计三种杂交蛋白质:D2-9Gly-Fc、D2-Fc和D2-9Gly-Ex3/CH3(图4)。所有三种杂交蛋白质含有与D2-9Gly-Fc相同的Flt-1结构域D2。使用不含多聚甘氨酸9-mer(9Gly)连接体的D2-Fc,没有观察到VEGF结合。第三种蛋白质,D2-9Gly-Ex3/CH3,含有多聚甘氨酸9-mer(9Gly)连接体和VEGF的多聚结构域(aaPSCVPLMRCGGCCN;SEQ ID NO:13;VEGF Ex3),但其还含有人类IgG1重链Fc的CH3区(SEQ ID NO:10的aa371-477)。
蛋白质D2-Fc在HUVEC增殖检测(图5)中没有表现出有效的抑制活性,且暗示未有效结合到VEGF165上。但是,第三种杂交蛋白质D2-9Gly-Ex3/CH3(其含有通过9Gly连接体和VEGF165的多聚区域(Ex3)融合到CH3区域上的Flt-1的结构域2)在VEGF-依赖型HUVECs增殖检测(图5)种确实表现出抑制活性。这意味着,这种杂交蛋白有效结合到VEGF165上。
实施例5
在Flt-1D2构建体中使用连接体(Gly4Ser)3
数种多聚甘氨酸连接体之前已经被描述用于改进蛋白质特征(Mouz等人,1996;Qiu等人,1998)。对于下一种构建体,我们已经使用另一种连接体,15-mer(Gly-Gly-Gly-Gly-Ser)3(Huston等人,1988)。生成D2-(Gly4Ser)3-Fc蛋白质,其含有Flt-1结构域2、(Gly4Ser)3连接体和人类IgG1重链的Fc区域。
在HUVECs增殖检测中进一步表征D2-(Gly4Ser)3-Fc。通过HUVEC增殖的抑制测得的D2-(Gly4Ser)3-Fc的生物活性与D2-9Gly-Fc和D2-9Gly-Ex3/CH3的类似(图6)。
通过免疫印迹法进一步表征D2-(Gly4Ser)3-Fc构建体并与D2-9Gly-Fc进行比较(图9)。这两种构建体均多数以二聚体形式存在,并在还原样品分离后检测单体形式。
实施例6
9Gly或VEGF Ex3在Flt-1(D2)构建体中的作用
为了调查9Gly连接体或VEGF二聚序列Ex3在可溶受体VEGF结合中的作用,生成三种其他构建体:D2-9Gly-CH3、D2-CH3和D2-Ex3/CH3(图8)。生成所有三种构建体,并与之前的构建体类似地也置于CMV启动子的控制下。在HUVECs增殖检测中评定它们的VEGF抑制活性(图9)。
含IgG1的CH3区的蛋白质的HUVEC增殖检测已经表明,D2-9Gly-CH3(无Ex3)和蛋白质D2-Ex3/CH3(无9Gly连接体)与母体D2-9Gly-Ex3/CH3蛋白质相比,具有类似的VEGF抑制效力。但是,在所有这些中,蛋白质D2-CH3似乎是最弱的VEGF抑制剂(图9中)。
来自转染293细胞的条件培养基的Flt-1ELISA数据已经表明了D2-9Gly-Ex3/CH3、D2-9Gly-CH3和D2-Ex3/CH3和D2-CH3的类似的Flt-1水平(70-90纳克/毫升),和D2-CH3的最低活性形式的略高水平(~150纳克/毫升)。D2-9Gly-CH3和D2-CH3构建体的免疫印迹(图10)表明二聚体形式在未还原条件下的优势。
实施例7
D2-9Gly-Fc结合VEGF优于所有构建体
VEGF结合检测使我们能够比较我们的可溶VEGF受体在无细胞体系中的相对VEGF结合亲合力。
简要地说,将含有已知浓度的可溶受体(浓度为0.29-150pM)的条件培养基连续稀释并用10pM VEGF混合。然后通过ELISA测量未结合的VEGF的量。在0.001至大约0.2pM的受体浓度下,D2-9Gly-Fc以比所有其他构建体高的亲合力结合VEGF。D2-CH3具有最低的结合VEGF的亲合力(图11)。
参考文献:
Davis-Smyth等,EMBOJ.,15,1996,4919
Huston,J.S.,等.(1991)Methods Enzymol.203,46-88
Huston,J.S.,等.(1988)Proc.Natl.Acad.Sci.USA,85,5879-5883.
Johnson,S.,等.(1991)Methods Enzymol.203,88-98
Karpus,P.A.,等.(1985)Naturwiss.,72,212-213.
Keyt.B.A.,等.(1996)J.Biol.Chem.271:5638-5646.
Kortt,A.A.,等.(1997)Protein Engng,10,423-433.
Lee,Y-L,等.(1998)Human Gene Therapy,9,457-465.
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序列表格
934140_3.TXT
SEQ ID NO 克隆名称 长度 类型
1 FLT1D29GLYFC 1077 DNA
2 FLT1D29GLYFC 358 蛋白质
3 FLT1D2DEL9GLY 1050 DNA
4 FLT1D2DEL9GLY 349 蛋白质
5 FLT1D29GLYVEG 426 DNA
6 FLT1D29GLYVEG 141 蛋白质
7 FLT1D29GLYVEG 744 DNA
8 FLT1D29GLYVEG 247 蛋白质
9 iGgl HEAVY 1434 DNA
10 IgGl HEAVY 477 蛋白质
11 VEGF 648 DNA
12 VEGF 215 蛋白质
13 VEGF外显子3 14 蛋白质
14 FLT-1 5777 DNA
15 FLT-1 1338 蛋白质
16 KDR 5830 DNA
17 KDR 1356 蛋白质
18 D2-CH3 675 DNA
19 D2-CH3 224 蛋白质
20 D2-EX3-CH3 717 DNA
21 D2-EX3-CH3 238 蛋白质
22 D2-9GLY-CH3 702 DNA
23 D2-9GLY-CH3 233 蛋白质
24 D2(G4s)3-Fc 1095 DNA
25 D2(G4s)3-Fc 364 蛋白质
26 随机连接体 9 蛋白质
27 连接体 9 蛋白质
28 连接体 9 蛋白质
29 连接体 9 蛋白质
30 连接体 9 蛋白质
31 连接体 7 蛋白质
934140_3.TXT
32 连接体 13 蛋白质
33 连接体 9 蛋白质
34 连接体 23 蛋白质
Claims (48)
1.式X-Y-Z的融合蛋白或多肽,其中
X是VEGF-R1的Ig样结构域2或是与信号肽连接的VEGF-R1的Ig样结构域2;
Y是由5-25个氨基酸残基的多肽构成的柔性连接体;
Z是IgG重链分子的CH3区或抗体分子的Fc部分,
其中所述式X-Y-Z的融合蛋白或多肽无VEGF受体的Ig样结构域3,且VEGF-R1的Ig样结构域2通过Y连接于Z。
2.权利要求1的式X-Y-Z的融合蛋白或多肽,其中X是VEGF-R1(FLT-1)的Ig-样结构域2。
3.权利要求1的式X-Y-Z的融合蛋白或多肽,其中多肽Y是柔韧的,且具有按照Karpus和Schultz1985方法预测的大于平均的柔性,>1。
4.权利要求1的式X-Y-Z的融合蛋白或多肽,其中多肽Y选自gly9(SEQ ID NO:27)、glu9(SEQ ID NO:28)、ser9(SEQ ID NO:29)、gly5cyspro2cys(SEQ ID NO:30)、(gly4ser)3(SEQ ID NO:31)、SerCysValProLeuMetArgCysGlyGlyCys CysAsn(SEQ ID NO:32)、ProSer Cys Val Pro Leu Met Arg Cys Gly Gly Cys Cys Asn(SEQ ID NO:13)、Gly-Asp-Leu-Ile-Tyr-Arg-Asn-Gln-Lys(SEQ ID NO:26)或Gly9ProSerCysValProLeuMetArgCysGlyGly Cys Cys Asn(SEQ ID NO:34)。
5.权利要求1的式X-Y-Z的融合蛋白或多肽,其中Z是IgG1 CH3区域。
6.权利要求1的式X-Y-Z的融合蛋白或多肽,其中Z是IgG2 CH3区域。
7.权利要求1的式X-Y-Z的融合蛋白或多肽,其中Z是IgG1 Fc。
8.权利要求1的式X-Y-Z的融合蛋白或多肽,其中Z是IgG2 Fc。
9.权利要求1的式X-Y-Z的融合蛋白或多肽,其氨基酸序列为SEQ IDNO:8、21或23所示的序列。
10.权利要求1的式X-Y-Z的融合蛋白或多肽,其氨基酸序列为SEQID NO:2或25所示的序列。
11.编码权利要求1-10之任一项的式X-Y-Z的融合蛋白或多肽的核酸分子。
12.包含权利要求11的核酸分子的核酸构建体。
13.包含权利要求12的核酸构建体的宿主细胞。
14.体外生产融合蛋白的方法,包括:
在权利要求13的宿主细胞中自权利要求12的核酸构建体表达产生该融合蛋白,
其中,所述融合蛋白无VEGF受体的Ig样结构域3,且在该融合蛋白中VEGF-R1的Ig样结构域2通过Y连接于Z,其中Y和Z如权利要求1-8之任一项所定义。
15.由权利要求14的方法产生的融合蛋白。
16.由权利要求12的核酸构建体表达的融合蛋白。
17.包含权利要求1-10之任一项的式X-Y-Z的融合蛋白或多肽或权利要求15或16的融合蛋白的组合物,其进一步包含一种或多种可药用赋形剂或载体。
18.权利要求17的组合物,其中所述组合物是液体制剂。
19.权利要求17的组合物,其中所述组合物是冻干制剂。
20.包含一种或多种权利要求1-10之任一项的式X-Y-Z的融合蛋白或多肽或权利要求15或16的融合蛋白的组合物,其中所述组合物包含所述融合蛋白的多聚体。
21.权利要求20的组合物,其中所述组合物由形成同源多聚体的单种融合蛋白构成。
22.权利要求20的组合物,其中所述组合物由融合蛋白构成,其中组合物中所述融合蛋白中的X部分是异源的。
23.权利要求20的组合物,其进一步包含一种或多种可药用赋形剂或载体。
24.权利要求23的组合物,其中所述组合物是液体制剂。
25.权利要求23的组合物,其中所述组合物是冻干制剂。
26.使多肽X多聚的方法,所述方法包括:
多肽X通过多肽Y连接到多肽Z上以形成多肽XYZ,其中
X是VEGF-R1(Flt-1)的Ig样结构域2或是与信号肽连接的VEGF-R1(Flt-1)的Ig样结构域2;
Y是由5-25个氨基酸残基的多肽构成的柔性连接体;
Z是IgG重链分子的CH3区或抗体分子的Fc部分;
其中该多肽XYZ无VEGF受体的Ig样结构域3,且VEGF-R1的Ig样结构域2通过Y连接于Z;
由此多肽XYZ多聚。
27.权利要求26的方法,其中X是VEGF-R1(Flt-1)的Ig样结构域2。
28.权利要求26的方法,其中连接步骤包括构建以单个开放阅读框形式编码X、Y和Z的核酸分子,其中所述多肽XYZ由宿主细胞中的核酸构建体表达。
29.载体,其包含权利要求11的核酸分子或权利要求12的核酸构建体。
30.权利要求29的载体,其中载体是病毒载体。
31.权利要求30的载体,其中病毒载体选自腺病毒载体、腺相关病毒载体、逆转录病毒载体和慢病毒载体。
32.权利要求31的载体,其中病毒载体是腺相关病毒载体。
33.包含权利要求11的核酸分子或权利要求12的核酸构建体或权利要求29-32之任一项的载体的哺乳动物细胞。
34.权利要求33的哺乳动物细胞,其是人类细胞。
35.权利要求34的哺乳动物细胞,其选自成纤维细胞、肝细胞、内皮细胞、角化细胞、造血细胞、滑膜细胞、上皮细胞、视网膜细胞或干细胞。
36.体外方法,包括:
将权利要求11的核酸分子或权利要求12的核酸构建体或权利要求29-32之任一项的载体输送到分离的哺乳动物细胞中以形成表达融合蛋白的细胞,
其中所述融合蛋白无VEGF受体的Ig样结构域3,且在该融合蛋白中VEGF-R1的Ig样结构域2通过Y连接于Z,其中Y和Z如权利要求1-8之任一项中所定义。
37.权利要求36的方法,其中融合蛋白自所述核酸分子表达。
38.权利要求36的方法,其中融合蛋白自所述核酸构建体表达。
39.权利要求36-38之任一项的方法,其中融合蛋白为选自SEQ ID NO:2、8、21、23或25的序列。
40.权利要求11的核酸分子或权利要求12的核酸构建体或权利要求29-32之任一项的载体在制备哺乳动物细胞中的用途,
其中所述细胞表达融合蛋白,并被输送给哺乳动物,
其中所述融合蛋白无VEGF受体的Ig样结构域3,且在该融合蛋白中VEGF-R1的Ig样结构域2通过Y连接于Z,其中Y和Z如权利要求1-8之任一项中所定义。
41.权利要求11的核酸分子或权利要求12的核酸构建体在制备用于将该核酸分子输送给哺乳动物的基因运送载体中的用途。
42.权利要求41的用途,其中基因运送载体是载体(vector)。
43.权利要求41的用途,其中载体是病毒载体。
44.权利要求43的用途,其中病毒载体选自腺病毒载体、腺相关病毒载体、逆转录病毒载体和慢病毒载体。
45.权利要求44的用途,其中病毒载体是腺相关病毒。
46.权利要求40-42之任一项的用途,其中融合蛋白为选自SEQ ID NO:2、8、21、23或25的序列。
47.权利要求1-10之任一项的式X-Y-Z的融合蛋白或多肽或权利要求15或16的融合蛋白在制备输送给哺乳动物的组合物中的用途。
48.权利要求47的用途,其中融合蛋白是选自SEQ ID NO:2、8、21、23或25的序列。
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