CN107709356A - 用于肿瘤特异性活化的掩蔽嵌合抗原受体t细胞 - Google Patents
用于肿瘤特异性活化的掩蔽嵌合抗原受体t细胞 Download PDFInfo
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Abstract
本发明涉及一种掩蔽的嵌合抗原受体,其包含:(a)掩蔽肽;(b)一个或多个抗原特异性靶向结构域;(c)细胞外间隔区结构域;(d)跨膜结构域;(e)至少一个共刺激结构域;以及(f)细胞内信号传导结构域。一旦切割所述掩蔽肽,所述mCAR便被活化。
Description
政府权利
本发明在美国国立卫生研究院(National Institutes of Health)授予的资助号CA170820、EB017206及CA132681下在政府支持下完成。政府对本发明享有某些权利。
发明领域
本发明涉及可活化的嵌合抗原受体及使用所述嵌合抗原受体基因工程化的细胞。所述可活化的mCAR当被掩蔽时无活性且当未被掩蔽时有活性。
背景
本文中的所有出版物均通过引用并入本文,其程度就如同每个单独出版物或专利申请被具体和单独地指明通过引用并入一样。以下描述包括可有助于理解本发明的信息。这并不是承认,本文所提供的任何信息是现有技术或者与正被要求保护的发明相关,或者被明确地或含蓄地引用的任何出版物是现有技术。
T细胞、特别是嵌合抗原受体(CAR)-工程化的T细胞的过继转移已显现为癌症免疫疗法中的有前景的手段。CAR为合成受体,其由特异性地识别肿瘤相关抗原(TAA)的细胞外单链可变片段(scFv)、铰链、跨膜结构域及细胞内信号传导和共刺激结构域组成。与天然存在的T细胞受体不同,CAR可直接识别其靶抗原,而无主要组织相容性复合体(MHC)分子所施加的限制并且可潜在地介导高水平的细胞杀灭活性。
CAR-修饰的T细胞(CAR-T)疗法在多个临床试验中显示出通过靶向B细胞特异性受体CD19来治疗B细胞恶性肿瘤的显著成功。这已重新激发了人们对开拓CAR-T技术用于治疗实体肿瘤的显著兴趣,且几个进行中的临床试验旨在测试这种治疗方式。然而,此种转换的一个具挑战性的方面是鉴别理想的限于肿瘤细胞的实体肿瘤抗原。虽然已经鉴别了许多实体肿瘤抗原,但它们中的大多数还在正常组织中以低水平表达。正是在健康细胞中的此低水平的抗原表达可造成CAR-T细胞的活化并导致“中靶脱肿瘤(on-target off-tumor)”毒性。举例来说,人表皮生长因子受体2(HER2)-特异性CAR-T细胞在一个患者中的输注由于HER2在肺组织中的表达而引起致死性炎性细胞因子释放。考虑到鉴别理想的肿瘤抗原的挑战,改善不希望有的中靶但脱肿瘤效应的一个策略是工程化肿瘤选择性机制至CAR结构中以允许肿瘤微环境中的靶抗原与正常组织中的那些抗原之间的较佳区分。
T细胞免疫疗法为可在患有黑色素瘤、B细胞淋巴瘤及其它癌症的患者中导致长期治愈的有力治疗。一种常用的方法是离体基因工程化T细胞以表达嵌合抗原受体(CAR),所述CAR可识别靶抗原,而无需MHC呈递。这些CAR-T细胞具有产生极高水平的抗肿瘤活性的潜能,但它们还可展示增强的脱靶细胞杀灭。因此,在本领域中需要使这种副作用最小化。本文描述了减少CAR-T细胞的脱靶细胞杀灭的组合物。
发明概述
以下实施方案及其方面结合系统、组合物及方法来描述和说明,这些系统、组合物及方法旨在为示例性和说明性的,而不旨在限制范围。
表达嵌合抗原受体的T细胞具有产生极高水平的抗肿瘤活性的潜能,但它们还可展示增强的脱靶细胞杀灭。为了使这种副作用最小化,已经设计了一种含有N末端掩蔽肽的嵌合抗原受体(CAR),所述掩蔽肽阻断了CAR结合至其靶标的能力,该靶标为表皮生长因子受体(EGFR),它是在广泛多种肿瘤中高度表达的肿瘤相关抗原。掩蔽肽可由例如通常在肿瘤微环境中有活性的蛋白酶切割,由此使得mCAR仅能识别其在肿瘤位点处的靶抗原。
本文提供了包含掩蔽的嵌合抗原受体(mCAR)的组合物,其中所述CAR当被掩蔽时无活性且当掩蔽物被切割时则有活性。在一个实施方案中,mCAR包含以下、由以下组成或基本上由以下组成:表1中示出的和/或SEQ ID NO:29的序列。如本文所述,掩蔽肽包含防止mCAR中的抗原特异性靶向结构域过早结合至其靶标的掩蔽物、可为蛋白酶的底物的切割位点、将掩蔽物连接至切割位点上的接头序列以及将切割位点连接至car上的接头序列。
在一个实施方案中,当掩蔽物未被切割时mCAR从N-末端至C-末端的结构排列为掩蔽物-接头-切割位点-接头-CAR。在一个实施方案中,当掩蔽物被切割时mCAR从N-末端至C-末端的结构排列为接头-CAR。
在一个实施方案中,当掩蔽物未被切割时mCAR从N-末端至C-末端的结构排列包含以下、由以下组成或基本上由以下组成:掩蔽物-接头-切割位点-接头-抗原特异性靶向结构域-跨膜结构域-共刺激结构域-细胞内信号传导结构域。另外的序列可存在于每个结构域之间,以便例如对mCAR提供进一步的柔性和稳定性。
在一个实施方案中,当掩蔽物未被切割时mCAR从N-末端至C-末端的结构排列包含以下、由以下组成或基本上由以下组成:掩蔽物-接头-切割位点-接头-抗原特异性靶向结构域-细胞外间隔区结构域-跨膜结构域-共刺激结构域-细胞内信号传导结构域。另外的序列可存在于每个结构域之间,以便例如对mCAR提供进一步的柔性和稳定性。
在一个实施方案中,对EGFR有特异性的mCAR包含一种掩蔽肽,其中所述掩蔽肽中的掩蔽物包含以下、由以下组成或基本上由以下组成:与CISPRGCPDGPYVMY(SEQ ID NO:1)至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的序列。在另一实施方案中,对Her2有特异性的mCAR包含一种掩蔽肽,其中所述掩蔽肽中的掩蔽物包含以下、由以下组成或基本上由以下组成:与LLGPYELWELSH(SEQ ID NO:17)至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的序列。在其它实施方案中,对GD2有特异性的mCAR包含一种掩蔽肽,其中所述掩蔽肽中的掩蔽物包含以下或由以下组成或基本上由以下组成:与RCNPNMEPPRCWAAEGD(SEQ ID NO:22)至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的序列或与(VCNPLTGALLCSAAEGD)(SEQ ID NO:23)至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的序列。在另外的实施方案中,对碳酸酐酶9(CA-IX)有特异性的mCAR包含一种掩蔽肽,其中所述掩蔽肽中的掩蔽物包含以下或由以下组成或基本上由以下组成:与LSTAFARV(SEQ ID NO:24)至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的序列或与ALGPGREYRAL(SEQ ID NO:25)至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的序列。
在一个实施方案中,mCAR包含一种掩蔽肽,其中所述掩蔽肽中的切割位点包含以下、由以下组成或基本上由以下组成:与LSGRSDNH(SEQ ID NO:2)至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的序列。
在一个实施方案中,所述mCAR包含特异性地结合并抑制(EGF R)的抗原特异性靶向结构域。在一个实施方案中,EGFR抑制剂包含以下、由以下组成或基本上由以下组成:与QILLTQSPVILSVSPGERVSFSCRASQSIGTNIHWYQQRTNGSPRLLIKYASESISGIPSRFSGSGSGTDFTLSINSVESEDIADYYCQQNNNWPTTFGAGTKLELKR(SEQ ID NO:3)至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的可变轻链序列和与QVQLKQSGPGLVQPSQSLSITCTVSGFSLTNYGVHWVRQSPGKGLEWLGVIWSGGNTDYNTPFTSRLSINKDNSKSQVFFKMNSLQSNDTAIYYCARALTYYDYEFAYWGQGTLVTVSS(SEQ ID NO:4)至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的可变重链序列。
在一些实施方案中,mCAR包含以下、由以下组成或基本上由以下组成:与表1中示出的和/或SEQ ID NO:29的序列至少100%、99%、98%、97%、96%95%、94%、93%、92%、91%、90%、85%或80%同一的序列。
本文还提供了用于产生大量表达掩蔽的嵌合抗原受体的T细胞的方法。所述方法包括用编码本文所述的掩蔽的嵌合抗原受体的载体转染T细胞并用表达由抗原特异性靶向结构域所靶向的抗原的细胞或用对mCAR的ASTD有特异性的重组抗原或其组合刺激一个或多个T细胞。在一些实施方案中,转染的细胞的刺激造成T细胞增殖,从而产生大量T细胞。
本文还提供了用于治疗、抑制、减轻受试者的疾病的症状或延缓/减慢其进展的方法。所述方法包括向所述受试者施用有效量的包含本文所述的mCAR的组合物。在一个实施方案中,组合物中的mCAR包含表1中示出的和/或SEQ ID NO:29的序列。在一个实施方案中,mCAR特异性地结合EGFR。在一个实施方案中,所述疾病为可通过抑制EGFR治疗的任何疾病。在一个实施方案中,所述疾病为癌症。在一些实施方案中,所述癌症为以下任一种或多种:肺癌、结肠直肠癌、乳腺癌、头颈癌、黑色素瘤、成胶质细胞瘤、胰腺癌、卵巢癌。在一个实施方案中,mCAR特异性地结合GD2神经节苷脂且所述癌症为神经母细胞瘤、黑色素瘤、小细胞肺癌、骨肉瘤或软组织肉瘤。在一个实施方案中,mCAR特异性地结合GD2神经节苷脂且所述癌症为神经母细胞瘤。在又一实施方案中,mCAR特异性地结合碳酸酐酶9且所述癌症为肾细胞癌、浅表性膀胱癌或浸润性尿路上皮癌。在一个实施方案中,mCAR特异性地结合碳酸酐酶9且所述癌症为肾细胞癌。
本文还提供了用于治疗、抑制、减轻受试者的肺癌的症状或延缓/减慢其进展的方法。所述方法包括向所述受试者施用有效量的包含本文所述的mCAR的组合物。在一个实施方案中,组合物中的mCAR包含以下、由以下组成或基本上由以下组成:表1中示出的和/或SEQ ID NO:29的序列。在一个实施方案中,mCAR特异性地结合EGFR。
附图简述
示例性实施方案在参考附图中示出。这意味着本文所公开的实施方案和附图被视为说明性而非限制性的。
图1根据本发明的一个实施方案描绘了未掩蔽、掩蔽及NSUB形式的抗EGFR CAR构建体的示意图。(a)掩蔽的CAR提高肿瘤选择性的基本原理设计的示意图。在存在蛋白酶的肿瘤微环境中,掩蔽肽被切割并且暴露了单链可变片段(scFv)的先前阻断的抗原结合位点。(b)各种抗EGFR mCAR构建体的示意图。scFv序列来源于单克隆抗体西妥昔单抗。scFv与CD8α铰链和跨膜结构域、接着是CD28/41BB/CD3ζ信号传导结构域框内融合,然后克隆到逆转录病毒载体中以产生未掩蔽的CAR。掩蔽肽和蛋白酶敏感性接头被插入未掩蔽的CAR中的scFv的上游以产生掩蔽的mCAR构建体。掩蔽肽和不可切割的GS接头被插入未掩蔽的CAR中的scFv的上游以产生NSUB(无蛋白酶底物序列)CAR构建体。
图2根据本发明的一个实施方案描绘了与抗EGFR CAR转导的Jurkat细胞的EGFR蛋白的结合能力。分别用编码EGFR CAR或掩蔽EGFR CAR的慢病毒载体转导Jurkat细胞。将CAR-Jurkat细胞用重组人EGFR-Fc染色,然后将山羊-抗人Fc抗体作为二级抗体(黑色)或仅当作背景的第二抗体(灰色)。
图3根据本发明的一个实施方案描绘了CAR-Jurkat-NFAT-GFP报道细胞通过与相应的靶细胞K562-EGFR或K562-CD19细胞共培养而被活化。分别用编码EGFR CAR、掩蔽EGFRCAR或CD19CAR的慢病毒载体转导Jurkat报道细胞。将CAR-Jurkat报道细胞与它们的靶细胞共培养。根据GFP表达评估CAR-Jurkat报道细胞的活化。掩蔽EGFR CAR的活化减弱但可在切割蛋白酶uPA(50nM)之后部分恢复。
图4根据本发明的一个实施方案描绘了CAR-Jurkat-NFAT-GFP报道细胞通过与乳腺癌细胞MDA-MB-231共培养而被活化。蛋白酶从MDA-MB-231细胞的内源性分泌可部分活化掩蔽EGFR CAR,而uPA(50nM)的处理可增强活化信号。
图5根据本发明的一个实施方案描绘了uPA浓度的滴定以恢复掩蔽EGFR CAR-Jurkat报道细胞的活化。更高浓度的uPA的处理产生更活化的掩蔽EGFR CAR-Jurkat报道群,通过在用靶K562-EGFR细胞刺激之后的其GFP表达来评估。
图6根据本发明的一个实施方案描绘了在人T细胞中各种CAR的表达及它们对靶抗原EGFR的结合能力。将人PBMC活化并用编码未掩蔽、掩蔽及NSUB抗EGFR CAR的逆转录病毒载体转导并离体扩增10天。(a)将三组CAR-T细胞用生物素化蛋白L、继之以APC-缀合的链霉亲和素染色以检测在细胞表面上的CAR表达。(b)将CAR-T细胞与重组人EGFR-Fc蛋白孵育,继之用PE缀合的山羊抗人Fc抗体染色以评价CAR对它们的靶抗原人EGFR的结合能力。
图7根据本发明的一个实施方案描绘了在蛋白酶处理之后各种CAR与靶抗原EGFR的结合。将未掩蔽、掩蔽及NSUB抗EGFR CAR-T细胞用uPA在渐增的浓度(0nM、100nM及400nM)下处理,然后用重组人EGFR-Fc(rhEGFR-Fc)和山羊抗人Fc抗体染色以评价蛋白酶处理对CAR与抗原的结合的影响。
图8根据本发明的一个实施方案描绘了根据本发明的一个实施方案用不同靶细胞刺激的各种CAR-T细胞的细胞内细胞因子染色。(a)在离体活化和扩增之后第10天,将未掩蔽、掩蔽及NSUB CAR-T细胞与K562、K562-EGFR、MDA-MB-231或NCI-H292细胞用GolgiPlug抑制剂共培养6小时。将未刺激的CAR-T细胞用作阴性对照,而用抗CD3/CD28抗体刺激的CAR-T细胞用作阳性对照。通过细胞内染色测量干扰素γ(IFN-γ)产生。CD8+T细胞示于各图中。对分泌IFN-γ的CD8T细胞进行门控,且其占总CD8+T细胞的百分比示于各散点图中。(b)概括的统计资料以条形图示出(n=3,平均值±SEM;ns,不显著;*,P<0.05;**,P<0.01;***,P<0.001,具有Tukey多重比较的单向ANOVA)。
图9根据本发明的一个实施方案描绘了各种CAR-T细胞针对不同靶细胞系的体外细胞毒性。将未掩蔽、掩蔽及NSUB CAR-T细胞与不同的靶细胞系共培养。(a)将CAR-T细胞与K562-EGFR细胞在1:1、3:1或10:1的效应物与靶细胞比率下共培养4小时且测量针对K562-EGFR的细胞毒性并示于图中。(b)将CAR-T细胞与NCI-H292细胞在1:1、3:1或10:1的效应物与靶细胞比率下共培养18小时且测量细胞毒性。(c)将CAR-T细胞与MDA-MB-231细胞在1:1、2.5:1、5:1或10:1的效应物与靶细胞比率下共培养18小时,且测量细胞毒性。
图10根据本发明的一个实施方案描绘了CAR-T细胞在人肺癌异种移植物模型中的抗肿瘤功效。(a)体内CAR-T处理方案的示意图。在第0天将NCI-H292细胞注射到NSG小鼠的右侧腹中。将小鼠随机分到4个组(每组n=8)中并在第13天和第26天用4百万个未掩蔽、掩蔽或NSUB CAR-T细胞处理;纳入未转导的T细胞作为对照。每周两次用卡尺测量肿瘤尺寸。(b)各组中的肿瘤生长曲线显示为平均值±SEM(ns,不显著;*,P<0.05;**,P<0.01)。(c)使用Kaplan-Meier方法计算小鼠存活曲线。
发明详述
本文引用的所有参考文献以引用的方式整体并入,如同全文引用一般。除非另外定义,否则本文所用的技术和科学术语具有本发明所属领域的普通技术人员通常理解的相同含义。Singleton等人,Dictionary of Microbiology and Molecular Biology第3版,J.Wiley&Sons(New York,NY 2001);March,Advanced Organic Chemistry Reactions,Mechanisms and Structure第5版,J.Wiley&Sons(New York,NY 2001);以及Sambrook和Russel,Molecular Cloning:A Laboratory Manual第3版,Cold Spring HarborLaboratory Press(Cold Spring Harbor,NY 2001)为本领域技术人员提供了本申请中所用的许多术语的通用指南。
本领域技术人员将认识到与本文所述的那些类似或等效的许多方法和材料,它们可在本发明的实践中使用。实际上,本发明决不限于所述方法和材料。出于本发明的目的,以下术语定义如下。
本文所述的本发明提供了可活化或掩蔽(mCARS)的嵌合抗原受体(CAR)。嵌合抗原受体为工程化的受体,其将免疫特异性移植到基因工程化的细胞上。掩蔽肽对CAR上的每个抗原结合位点有独特性且致使CAR无活性直到例如通过切割将CAR连接至掩蔽肽上的接头而被活化为止。
如本文所用的“掩蔽肽”(MP)是指当MP呈未切割状态时抑制CAR的ASTD与靶细胞上的抗原结合的肽。MP经由可切割的接头部分连接到CAR上。MP包含防止CAR结合靶细胞上的抗原的掩蔽物(肽)和切割位点。在一些实施方案中,接头序列将掩蔽肽与切割位点分隔开且掩蔽肽(MP)具有结构掩蔽物-接头-切割位点。切割位点包含由蛋白酶识别的氨基酸。掩蔽物的长度可为5-50个氨基酸。MP在切割的状态下不干扰CAR与靶细胞上的抗原的结合。在一些实施方案中,呈未切割状态的掩蔽的CAR(mCAR)从N-末端至C-末端的结构排列为MP-L-ASTD-ESD-TM-CSD-ISD。在一些实施方案中,呈未切割状态的mCAR从N-末端至C-末端的结构排列为MP-L-ASTD-TM-CSD-ISD。在各种实施方案中,掩蔽肽对每个ASTD有独特性。
如本文所用的“抗原特异性靶向结构域”(ASTD)是指靶向特异性抗原的CAR的结构域/区域。mCAR可包含一个或多个ASTD。ASTD为细胞外的并且可包含抗体或其功能等效物或其片段或其衍生物。靶向结构域/区可包含全长重链、Fab片段、单链Fv(scFv)片段、二价单链抗体或双抗体,其各自对靶抗原有特异性。如本领域技术人员应理解,在一些实施方案中,以高亲和力结合给定抗原的任何分子都可用作ASTD,例如,连接的细胞因子(其导致携带细胞因子受体的细胞的识别)、亲和体、来自天然存在的受体的配体结合结构域、用于受体的可溶性蛋白/肽配体(例如在肿瘤细胞上)、肽、及疫苗,以引起免疫应答。
如本文所用的“嵌合抗原受体”或“CAR”或“CAR”是指工程化的受体,其将抗原特异性移植到细胞(例如T细胞,如天然T细胞、中心记忆T细胞、效应记忆T细胞或其组合)上。CAR也称为人工T细胞受体、嵌合T细胞受体或嵌合免疫受体。CAR包含一个或多个抗原特异性靶向结构域、细胞外结构域、跨膜结构域、一个或多个共刺激结构域、及细胞内信号传导结构域。在一个实施方案中,如果CAR靶向两种不同抗原,那么抗原特异性靶向结构域可以串联排列并由接头序列分隔开。
如本文所用的“共刺激结构域”(CSD)是指CAR增强记忆细胞的增殖、存活和/或发育的部分。CAR可包含一个或多个共刺激结构域。每个共刺激结构域包含以下任一种或多种的共刺激结构域:例如TNFR超家族的成员、CD28、CD137(4-1BB)、CD134(OX40)、Dap10、CD27、CD2、CD5、ICAM-1、LFA-1(CD11a/CD18)、Lck、TNFR-I、TNFR-II、Fas、CD30、CD40或其组合。其它共刺激结构域(例如来自其它蛋白质)将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
如本文所用的“细胞外间隔区结构域”(ESD)是指介于抗原特异性靶向结构域与跨膜结构域之间的亲水区。在一些实施方案中,本发明的mCAR可包括或不包括细胞外间隔区结构域。细胞外间隔区结构域包括但不限于抗体的Fc片段或其片段或衍生物、抗体的铰链区或其片段或衍生物、抗体的CH2区、抗体的CH3区、人工间隔区序列或其组合。
如本文所用的“细胞内信号传导结构域”(ISD)或“细胞质结构域”是指CAR转导效应子功能信号并指导细胞执行其专门功能的部分。转导效应子功能信号的结构域的实例包括但不限于T细胞受体复合物的ζ链或其任何同系物(例如,η链、FcεR1γ和β链、MB1(Igα)链、B29(Igβ)链等)、人CD3ζ链、CD3多肽(Δ、δ和ε)、syk家族酪氨酸激酶(Syk、ZAP 70等)、src家族酪氨酸激酶(Lck、Fyn、Lyn等)及T细胞转导中所涉及的其它分子,如CD2、CD5和CD28。
如本文所用的“接头”(L)或“接头结构域”或“接头区”是指长度约1至100个氨基酸的寡肽或多肽区,其将CAR的任何结构域/区连接在一起并将CAR连接到掩蔽肽上。接头可由像甘氨酸和丝氨酸的柔性残基组成以便相邻的蛋白质结构域相对于彼此自由地移动。当需要确保两个相邻结构域在空间上不相互干扰时,可使用更长的接头。接头可为可切割的或不可切割的。在一些实施方案中,可切割的将掩蔽肽连接到CAR。可切割的接头的实例包括2A接头(例如T2A)、2A样接头或其功能等效物及其组合。在一些实施方案中,接头包括小核糖核酸病毒2A样接头、猪捷申病毒(P2A)、明脉扁刺蛾(Thosea asigna)病毒(T2A)的CHYSEL(SEQ ID NO:5)序列或其组合、变体及功能等效物。在其它实施方案中,接头序列可包含Asp-Val/Ile-Glu-X-Asn-Pro-Gly(2A)–Pro(2B)基序(SEQ ID NO:6和SEQ ID NO:7),其造成2A甘氨酸与2B脯氨酸之间的切割。其它接头将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
如本文所用的“跨膜结构域”(TMD)是指CAR跨质膜的区域。本发明的CAR的跨膜结构域为跨膜蛋白(例如I型跨膜蛋白)的跨膜区、人工疏水序列或其组合。
如本文所用的“B细胞相关疾病”包括B细胞免疫缺陷、自身免疫疾病和/或与B细胞相关的过度/不受控制的细胞增殖(包括淋巴瘤和/或白血病)。这种疾病(其中本发明的mCAR可用于治疗方法)的实例包括但不限于全身性红斑狼疮(SLE)、糖尿病、类风湿性关节炎(RA)、反应性关节炎、多发性硬化症(MS)、寻常天疱疮、乳糜泻、克罗恩氏病(Crohn'sdisease)、炎性肠病、溃疡性结肠炎、自身免疫性甲状腺病、X染色体连锁的无丙种球蛋白血症、前B急性淋巴母细胞性白血病、全身性红斑狼疮、常见变异型免疫缺陷病、慢性淋巴细胞性白血病、与选择性IgA缺乏和/或IgG亚类缺乏相关的疾病、B谱系淋巴瘤(何杰金氏淋巴瘤(Hodgkin's lymphoma)和/或非何杰金氏淋巴瘤)、具有胸腺瘤的免疫缺陷、短暂性低丙种球蛋白血症和/或高IgM综合征以及病毒介导的B细胞疾病(如EBV介导的淋巴组织增生病)、及B细胞参与病理生理过程的慢性感染。
“有益的结果”可包括但决不限于减轻或缓解疾病状况的严重性、防止疾病状况恶化、治愈疾病状况、预防疾病状况发展、降低患者发展成疾病状况的机会及延长患者的寿命或预期寿命。
“癌症”和“癌性”是指或描述通常特征为失控的细胞生长的哺乳动物中的生理状况。癌症的实例包括但不限于B细胞淋巴瘤(何杰金氏淋巴瘤和/或非何杰金氏淋巴瘤)、脑肿瘤、乳腺癌、结肠癌、肺癌、肝细胞癌、胃癌、胰腺癌、子宫颈癌、卵巢癌、肝癌、膀胱癌、泌尿道癌、甲状腺癌、肾癌、癌瘤、黑色素瘤、头颈癌、脑癌以及前列腺癌,包括但不限于雄激素依赖性前列腺癌和非雄激素依赖性前列腺癌。
如本文所用的“病状”、“疾病状况”、“疾病”及“疾病状态”包括其中患病细胞可用本发明的CAR靶向的生理状态,所述CAR例如针对患病细胞上的特异性抗原表达抗体。可被靶向的抗原的实例包括但不限于B细胞上表达的抗原;癌瘤、肉瘤、淋巴瘤、白血病、生殖细胞肿瘤、胚细胞瘤上表达的抗原;各种免疫细胞上表达的抗原;及与各种血液疾病、自身免疫疾病和/或炎性疾病相关的细胞上表达的抗原。在一个示例性实施方案中,所靶向的抗原为EGFR。
“效应子功能”是指分化细胞的专门功能。T细胞的效应子功能例如可为溶细胞活性或辅助活性,包括细胞因子的分泌。
如本文所用的“基因修饰的细胞”、“重定向的细胞”、“基因工程化的细胞”或“修饰的细胞”是指表达本发明的mCAR的细胞。基因修饰的细胞包括但不限于基因修饰的T细胞、NK细胞、造血干细胞、多能胚胎干细胞或胚胎干细胞。基因修饰的细胞表达本发明的mCAR,所述mCAR为可活化的并且可靶向靶细胞表面上表达的任何抗原
如本文所用的“免疫细胞”是指哺乳动物免疫系统的细胞,包括但不限于抗原呈递细胞、B细胞、嗜碱性粒细胞、细胞毒性T细胞、树突细胞、嗜酸性粒细胞、粒细胞、辅助T细胞、白细胞、淋巴细胞、巨噬细胞、肥大细胞、记忆细胞、单核细胞、天然杀伤细胞、嗜中性白细胞、吞噬细胞、浆细胞及T细胞。
如本文所用的“免疫应答”是指包括但不限于以下的免疫:先天免疫、体液免疫、细胞免疫、免疫力、炎症应答、获得性(适应性)免疫、自身免疫和/或过分活跃的免疫。
如本文所用的“哺乳动物”是指哺乳纲的任何成员,包括但不限于人和非人灵长类动物,如黑猩猩及其它猿和猴物种;农场动物,如牛、绵羊、猪、山羊和马;家养哺乳动物,如狗和猫;实验室动物,包括啮齿动物,如小鼠、大鼠和豚鼠等等。该术语不表示特定的年龄或性别。因此,无论是雄性还是雌性的成年和新生及胎儿受试者都旨在包括于该术语的范围内。
如本文所用的“多核苷酸”包括但不限于DNA、RNA、cDNA(互补DNA)、mRNA(信使RNA)、rRNA(核糖体RNA)、shRNA(小发夹RNA)、snRNA(小核RNA)、snoRNA(短核仁RNA)、miRNA(微小RNA)、基因组DNA、合成DNA、合成RNA和/或tRNA。
如本文所用的“裸DNA”是指编码以用于表达的适当方向克隆于合适的表达载体中的CAR的DNA。可使用的病毒载体包括但不限于SIN慢病毒载体、逆转录病毒载体、泡沫病毒载体、腺相关病毒(AAV)载体、杂合载体和/或质粒转座子(例如,睡美人(sleeping beauty)转座子系统)或基于整合酶的载体系统。可结合本发明的替代实施方案使用的其它载体将为本领域技术人员显而易见。
如本文所用的“单链可变片段”、“单链抗体可变片段”或“scFv”抗体是指仅包含由接头肽相连的重链和轻链可变区的抗体形式。
如本文所用的“靶细胞”是指牵涉于疾病中并且可由本发明的基因修饰的细胞(包括但不限于基因修饰的T细胞、NK细胞、造血干细胞、多能干细胞和胚胎干细胞)靶向的细胞。其它靶细胞将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
术语“T细胞”与“T淋巴细胞”在本文中可互换并同义地使用。实例包括但不限于天然T细胞、中心记忆T细胞、效应记忆T细胞或其组合。
如本文所用的“治疗剂”是指用于例如治疗、抑制、预防、减轻疾病的影响、降低疾病的严重性、减小发展成疾病的可能性、减缓疾病进展和/或治愈疾病的药剂。由治疗剂靶向的疾病包括但不限于癌瘤、肉瘤、淋巴瘤、白血病、生殖细胞肿瘤、胚细胞瘤、在各种免疫细胞上表达的抗原、及在与各种血液疾病、自身免疫疾病和/或炎性疾病相关的细胞上表达的抗原。
如本文所用的“转导”是指使用病毒载体将外源核酸引入到细胞中。
如本文所用的“转染”是指使用重组DNA技术将外源核酸引入到细胞中。术语“转化”意指“外源”(即外部的或细胞外的)基因、DNA或RNA序列引入到宿主细胞中,以使得宿主细胞将表达引入的基因或序列以产生所需物质,如由引入的基因或序列编码的蛋白质或酶。引入的基因或序列也可称作“克隆的”或“外源的”基因或序列,可包括调节或控制序列,如起始、终止、启动子、信号、分泌或由细胞遗传机构使用的其它序列。基因或序列可包括非功能性序列或具有未知功能的序列。接受和表达所引入的DNA或RNA的宿主细胞已经成为“转化的”并且是“转化体”或“克隆”。被引入宿主细胞中的DNA或RNA可以来自任何来源,包括与宿主细胞相同种属或种类的细胞或者不同种属或种类的细胞。
如本文所用的“处理(Treatment)”和“处理(treating)”是指治疗性处理和预防或防范措施,其中目标是防止或减缓(减轻)靶标病理状况、预防病理状况、寻求或获得有益结果、或减小个体发展成病状的机会,即便该处理最终未获得成功。需要处理的那些包括已经患有病状的那些以及倾向于患上病状的那些或病状有待预防的那些。
如本文所用的“肿瘤”是指无论是恶性还是良性的所有赘生细胞生长和增殖,及所有癌前和癌性细胞和组织。
如本文所用的“载体”、“克隆载体”和“表达载体”是指多核苷酸序列(例如外源基因)借此可引入到宿主细胞中以便转化宿主并促进所引入的序列的表达(例如转录和翻译)的媒介物。载体包括质粒、噬菌体、病毒等。
表达嵌合抗原受体的T细胞具有产生极高水平的抗肿瘤活性的潜能,但它们还可展示增强的脱靶细胞杀灭。为了使这种副作用最小化,本发明人描述了具有N末端掩蔽肽的CAR,所述掩蔽肽阻断CAR过早地结合至其靶标的能力。
本文描述了掩蔽的/可活化的嵌合抗原受体(mCAR),其包含对一个或多个抗原有特异性的嵌合抗原受体和掩蔽肽。掩蔽肽阻断CAR上的抗原特异性结合区与靶细胞上的抗原过早结合。在一般实施方案中,本发明涉及mCAR、编码mCAR的核酸序列、包含编码mCAR的核酸的载体、包含编码mCAR的核酸序列的病毒、表达mCAR和使用mCAR作为治疗剂的宿主细胞(如基因修饰的细胞)。构建本发明的mCAR以便它们可在细胞中表达,这些细胞又应答于与至少一个抗原特异性靶向结构域相互作用的至少一种分子(例如抗原)的存在而增殖。具体来说,抗原与抗原结合结构域之间的相互作用促进表达mCAR的细胞的增殖。其它因素(例如微环境中的细胞因子、结合亲和力、调节细胞的存在等)也可促进表达mCAR的细胞的增殖。
本文所述的mCAR可作为单一多肽链合成并且包含掩蔽肽、一个或多个抗原特异性靶向结构域、细胞外间隔区结构域、跨膜结构域、一个或多个共刺激结构域及细胞内信号结构域。在此实施方案中,掩蔽肽处于抗原特异性靶向结构域的N-末端并且串联排列并由接头肽分隔。抗原特异性靶向结构域连接到细胞外间隔区结构域,细胞外间隔区结构域连接到跨膜结构域。跨膜结构域连接到共刺激结构域。共刺激结构域连接到在C-末端处的细胞内信号传导结构域。如果使用一个以上共刺激结构域,那么多个共刺激结构域可与在其N-末端处的跨膜结构域和在其C-末端处的细胞内信号传导结构域串联排列。编码这些多肽的多核苷酸可进一步包含N-末端信号序列,该信号序列将mCAR导向细胞表面作为I型跨膜蛋白。抗原特异性靶向结构域可为细胞外朝向的,而细胞内信号传导结构域可为细胞质的。
图1示出了本发明的掩蔽的嵌合抗原受体的示意图。
掩蔽肽
所述掩蔽肽包含掩蔽物和切割位点。在各种实施方案中,掩蔽肽对CAR的每个抗原特异性靶向结构域有特异性。例如,对靶抗原有特异性的每个scFv将具有独特的掩蔽肽序列。掩蔽物与切割位点通过接头相连。掩蔽物对CAR的抗原特异性靶向结构域有特异性/独特性并且阻断CAR与靶细胞上的抗原的结合直到mCAR通过在切割位点处切割掩蔽肽而被活化。掩蔽的CAR的一个示例性实施方案描述于表1和/或SEQ ID NO:29中。
掩蔽肽的长度可为5至50个氨基酸。在各种实施方案中,掩蔽肽(包含掩蔽物、接头和切割位点)的长度为2-5、5-10、5-15、10-15、10-25、15-20、15-25、20-25、20-30、25-30、25-35、30-35、35-40、35-45、40-45或45-50个氨基酸。在一些实施方案中,掩蔽肽的长度为5、10、15、20、25、30、35、40、45或50个氨基酸。在一个实施方案中,掩蔽肽中的掩蔽物对CAR的每个抗原特异性靶向结构域有特异性。在一些实施方案中,掩蔽物的长度可为2-5、5-10、5-15、10-15、10-25个氨基酸。
在一个示例性实施方案中,mCAR中的ASTD对EGFR有特异性且掩蔽物包含以下或由以下组成或基本上由以下组成:序列CISPRGCPDGPYVMY(SEQ ID NO:1)。在另一示例性实施方案中,mCAR中的ASTD对EGFR有特异性且掩蔽物包含以下或由以下组成或基本上由以下组成:序列QGQSGQCISPRGCPDGPYVMY(SEQ ID NO:8)。在另一示例性实施方案中,mCAR中的ASTD对Her2有特异性且掩蔽物包含以下或由以下组成或基本上由以下组成:序列LLGPYELWELSH(SEQ ID NO:17)。在其它示例性实施方案中,CAR中的ASTD对GD2神经节苷脂有特异性且掩蔽物包含以下或由以下组成或基本上由以下组成:序列RCNPNMEPPRCWAAEGD(SEQ IDNO:22)或(VCNPLTGALLCSAAEGD)(SEQ ID NO:23)。在另一些示例性实施方案中,CAR中的ASTD对碳酸酐酶9(CA-IX)有特异性且掩蔽物包含以下或由以下组成或基本上由以下组成:序列LSTAFARV(SEQ ID NO:24)或ALGPGREYRAL(SEQ ID NO:25)。
用于筛选掩蔽肽中的掩蔽物的方法将为本领域技术人员显而易见。在一些实施方案中,将组合方法用于设计掩蔽肽。组合方法包括将已知的掩蔽物(例如,已显示结合至抗体或其它抗原结合结构域的肽)与已知的抗原结合结构域(例如单链抗体或其它蛋白结合结构域)组合。在一些实施方案中,从头筛选方法被用于通过在例如细菌展示肽文库中针对其在现有的CAR中掩蔽抗原特异性结合结构域的能力筛选肽来设计掩蔽肽。使用多种已知技术中的任一种鉴别合适的掩蔽部分。例如,使用Daugherty等人的美国专利申请公布号2009/0062142中所述的方法鉴别肽掩蔽部分,该专利的内容据此以引用的方式整体并入。采用细菌展示筛选,例如,掩蔽肽文库通过与细菌膜蛋白如OmpX融合而展示在细胞表面上。将转化的细胞与对应于CAR的抗原结合结构域的荧光团标记的抗体一起孵育,并且通过荧光活化细胞分选法分离结合的细胞。扩增结合的细胞,并且重复几轮选择过程。通过选择的克隆的测序鉴别候选掩蔽肽序列。其它筛选方法包括噬菌体展示,如Barbas,Carlos F.等人Phage display:a laboratory manual.CSHL Press,2004中所教导;mRNA展示,如Wilson,David S.,Anthony D.Keefe和Jack W.Szostak."The use of mRNA display toselect high-affinity protein-binding peptides."Proceedings of the NationalAcademy of Sciences 98.7(2001):3750-3755中所教导;及酵母展示,如Boder,Eric T.和K.Dane Wittrup."Yeast surface display for screening combinatorial polypeptidelibraries."Nature biotechnology 15.6(1997):553-557中所教导。
在各种实施方案中,切割位点包含包括蛋白酶的底物的序列,例如在受试者的处理位点处与靶抗原共定位的蛋白酶。在一些实施方案中,掩蔽肽中的切割位点的长度为2-5、5-10、5-15、10-15、5、8、10、12或15个氨基酸。在一个示例性实施方案中,切割位点包含以下或由以下组成或基本上由以下组成:序列LSGRSDNH(SEQ ID NO:2);并且对uPA蛋白酶有特异性。在另一示例性实施方案中,切割位点包含以下或由以下组成或基本上由以下组成:序列LSGRSDNHGSSGT(SEQ ID NO:9);并且对uPA蛋白酶有特异性。用于选择适于与本文所述的mCAR一起使用的合适的切割位点的方法将为本领域技术人员显而易见。在一些实施方案中,切割位点为蛋白酶如uPA、MT-SPl、豆荚蛋白的底物。在一些实施方案中,切割位点为蛋白酶如基质金属蛋白酶(MMP)的底物。基质金属蛋白酶(MMP)可切割的接头序列的实例包括但不限于蛋白酶MMP-1底物VLVPMAMMAS(SEQ ID NO:26)、MMP-2和/或MMP-9底物GPLGIAGQ(SEQ ID NO:27)或PVGLIG(SEQ ID NO:28)。
切割位点的所需特征包括但不限于对受试者无毒性、在受试者中的体循环期间的稳定性、对循环蛋白酶(如凝血酶、纤溶酶等)不敏感以及在受试者的预定处理位点处有活性。使用多种已知技术中的任一种鉴别合适的底物。例如,使用Daugherty等人的美国专利号7,666,817中所述的方法鉴别肽底物,该专利的内容据此以引用的方式整体并入。(还参见Boulware等人"Evolutionary optimization of peptide substrates for proteasesthat exhibit rapid hydrolysis kinetics."Biotechnol Bioeng.106.3(2010):339-46)。
在一个示例性实施方案中,掩蔽物与切割位点之间的接头包含以下或由以下组成或基本上由以下组成:序列GSSGGSGGSGGSG(SEQ ID NO:10),并且将掩蔽肽连接到CAR上的接头包含以下或由以下组成或基本上由以下组成:序列GSSGT(SEQ ID NO:11)。
在一些实施方案中,掩蔽的CAR(mCAR)降低CAR结合至受试者的处理位点处的靶抗原的能力,以使得CAR在连接到针对靶抗原的掩蔽肽上时的离解常数(Kd)为CAR在不连接到针对该抗原的掩蔽肽上时的Kd的至少20倍。在一些实施方案中,掩蔽的CAR(mCAR)降低CAR结合至受试者的处理位点处的靶抗原的能力,以使得CAR在连接到针对靶抗原的掩蔽肽上时的离解常数(Kd)为CAR在不连接到针对该抗原的掩蔽肽上时的Kd的至少100倍。在一些实施方案中,掩蔽的CAR(mCAR)降低CAR结合至受试者的处理位点处的靶抗原的能力,以使得CAR在连接到针对靶抗原的掩蔽肽上时的离解常数(Kd)为CAR在不连接到针对该抗原的掩蔽肽上时的Kd的至少1000倍。在一些实施方案中,掩蔽的CAR(mCAR)降低CAR结合至受试者的处理位点处的靶抗原的能力,以使得CAR在连接到针对靶抗原的掩蔽肽上时的离解常数(Kd)为CAR在不连接到针对该抗原的掩蔽肽上时的Kd的至少1000倍。在一个示例性实施方案中,掩蔽的CAR(mCAR)降低EGFR特异性CAR结合至受试者的处理位点处的EGFR的能力,以使得EGFR特异性CAR在连接到针对EGFR的掩蔽肽上时的离解常数(Kd)为EGFR特异性CAR在不连接到针对该抗原的掩蔽肽上时的Kd的至少20、50、100、100或10,000倍中的任一者。
在一些实施方案中,在靶抗原的存在下,掩蔽肽与当切割位点被切割时相比当切割位点未被切割时使CAR结合靶抗原的能力降低了至少95%、90%、85%、80%、75%、70%或65%,使用靶标置换测定在体外进行测定,如例如在PCT公布号WO 2009/025846和WO2010/081173中所述的测定。在一个示例性实施方案中,在EGFR的存在下,表1和/或SEQID NO:29中所述的掩蔽肽与当切割位点被切割时相比当如表1所示的切割位点(LSGRSDNH)未被切割时使EGFT特异性CAR结合EGFR的能力降低了至少95%、90%、85%、80%、75%、70%或65%。
嵌合抗原受体的抗原特异性靶向结构域
本发明的mCAR可靶向一种或多种抗原。由mCAR的ASTD所靶向的抗原可为单一患病细胞(如癌性B细胞)上的抗原或在各自促成疾病的单独细胞上表达的抗原。由mCAR所靶向的抗原为疾病中直接或间接涉及的抗原。包含mCAR的ASTD的抗体可对挑选的任何抗原有特异性。对抗原有特异性的抗体可为抗体的Fab片段或抗体的单链可变片段(scFv)。
例如,图1示出了本发明的一个实施方案,其描绘了对EGFR有特异性并且包含掩蔽肽和可切割的接头的mCAR。使用本领域技术人员所熟知的方法,在ASTD(如scFv)的上游(即N-末端)处克隆掩蔽肽。此外,对抗原有特异性的scFv可在CD28TM-41BBCSD-CD3ζISD结构域的上游(即N-末端)处克隆,只要靶抗原在可由如下所述的基因修饰的细胞靶向的细胞上表达。在另一实施方案中,对抗原有特异性的scFv可在CD8α铰链-CD8TM-CD28CSD-41BBCSD-CD3ζISD(图1)结构域的上游(即N-末端)处克隆,只要靶抗原在可由如下所述的基因修饰的细胞靶向的细胞上表达。这种技术在文献中充分阐明。(Sambrook等人,“MolecularCloning:A Laboratory Manual”(1989),Current Protocols in Molecular Biology.第I-III卷[Ausubel,R.M.编著(1994)],Cell Biology:A Laboratory Handbook.第I-III卷[J.E.Celis编著(1994))],Current Protocols in Immunology.第I-III卷[Coligan,J.E.编著(1994)],Oligonucleotide Synthesis.(M.J.Gait编著1984),Nucleic AcidHybridization[B.D.Hames&S.J.Higgins编著(1985)],Transcription And Translation[B.D.Hames&S.J.Higgins编著(1984)],Animal Cell Culture[R.I.Freshney编著(1986)],Immobilized Cells And Enzymes[IRL Press,(1986)],Practical Guide ToMolecular Cloning B.Perbal(1984),Current Prptocols in Immunology(J.E.Coligan,A.M.Kruisbeek,D.H.Margulies,E.M.Shevach和W.Strober编著,1991),免疫学年鉴(Annual Review of Immunology)及专题论文期刊,如免疫学进展(Advances inImmunology))。
在一个实施方案中,抗原特异性靶向结构域包含全长IgG重链(对靶抗原有特异性),其具有VH、CH1、铰链、及CH2和CH3(Fc)Ig结构域,如果VH结构域单独足以赋予抗原特异性(“单结构域抗体”)的话。全长IgG重链可经由适当的跨膜结构域连接到共刺激结构域和细胞内信号传导结构域。在一个实施方案中,细胞外间隔区结构域可连接于抗原特异性结合结构域与跨膜结构域之间。
在另一实施方案中,mCAR的每个抗原特异性靶向结构域包含一个或多个单链抗体可变片段(scFv)。如果mCAR中存在一个以上scFV,那么每个scFV对不同的靶抗原有特异性。已经开发了其中一个可变结构域(VH或VL)的C-末端经由多肽接头连接到另一个(分别是VL或VH)的N-末端上的scFv,而不会明显破坏抗原结合或结合特异性。(Chaudhary等人,Arecombinant single-chain immunotoxin composed of anti-Tac variable regionsand a truncated diphtheria toxin.1990Proc.Natl.Acad.Sci.,87:9491;Bedzyk等人Immunological and structural characterization of a high affinity anti-fluorescein single-chain antibody.1990J.Biol.Chem.,265:18615)。接头将VH的N-末端与VL的C-末端相连或将VH的C-末端与VL的N-末端相连。这些scFv缺乏天然抗体的重链和轻链中存在的恒定区(Fc)。在一些实施方案中,scFv对至少两种不同的抗原有特异性并且串联排列并经由跨膜结构域连接到共刺激结构域和细胞内信号传导结构域上。在一个任选的实施方案中,细胞外间隔区结构域可连接于抗原特异性结合区与跨膜结构域之间。
另一方面,每个scFv片段可融合至重链的恒定结构域的全部或一部分。所得到的抗原特异性靶向结构域经由跨膜结构域连接到共刺激结构域和细胞内信号传导结构域。在一个任选的实施方案中,细胞外间隔区结构域可连接于抗原特异性结合结构域与跨膜结构域之间。
在又一实施方案中,mCAR的一个或多个抗原特异性靶向结构域包含二价(或双价)单链可变片段(二-scFv、双-scFv)。在包含二-scFV的mCAR中,对抗原有特异性的两个scFv通过用两个VH和两个VL区产生单肽链而连接在一起,由此产生串联的scFv。(Xiong,Cheng-Yi;Natarajan,A;Shi,XB;Denardo,GL;Denardo,SJ(2006).“Development of tumortargeting anti-MUC-1multimer:effects of di-scFv unpairedcysteine location onPEGylation and tumor binding”.Protein Engineering Design and Selection 19(8):359–367))。包含一个或多个抗原特异性靶向结构域的mCAR将表达对两种抗原中的每一种有特异性的两个scFv。所得到的抗原特异性靶向结构域经由跨膜结构域连接到共刺激结构域和细胞内信号传导结构域。在一个任选的实施方案中,细胞外间隔区结构域可连接于抗原特异性结合结构域与跨膜结构域之间。
在另一实施方案中,mCAR的每个抗原特异性靶向结构域包含双抗体。在双抗体中,用接头肽生成scFv,该接头肽过短以致于两个可变区不能折叠在一起,由此促使scFv二聚化。较短的接头(一个或两个氨基酸)还导致三聚体形成,即所谓的三抗体或三体。还可使用四抗体。
为了生成本发明的mCAR,抗原特异性靶向结构域共价地或非共价地在单一蛋白质分子上彼此相连。寡肽或多肽接头、Fc铰链或膜铰链区可用于将这些结构域彼此相连。
掩蔽的嵌合抗原受体的共刺激结构域
本发明的mCAR还可包含共刺激结构域。此结构域可增强记忆细胞的细胞增殖、细胞存活和发育。本发明的mCAR还可包含一个或多个共刺激结构域。每个共刺激结构域包含以下任一种或多种的共刺激结构域:例如TNFR超家族的成员、CD28、CD137(4-1BB)、CD134(OX40)、Dap10、CD27、CD2、CD5、ICAM-1、LFA-1、Lck、TNFR-1、TNFR-II、Fas、CD30、CD40或其组合。来自其它蛋白质的共刺激结构域也可与本发明的CAR一起使用。另外的共刺激结构域将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。如果mCAR包含一个以上共刺激结构域,那么这些结构域可串联排列,任选由接头分隔开。
掩蔽的嵌合抗原受体的细胞外间隔区结构域
本发明的mCAR可进一步包含细胞外间隔区结构域。在一些实施方案中,此结构域促进恰当的蛋白质折叠。细胞外间隔区结构域包含亲水区,该亲水区连接至抗原特异性靶向结构域和跨膜结构域。细胞外间隔区结构域可包括但不限于抗体的Fc片段或其片段或衍生物、抗体的铰链区或其片段或衍生物、抗体的CH2区、抗体的CH3区、人工间隔区序列或其组合。细胞外间隔区结构域的实例包括但不限于CD8α铰链、由多肽如Gly3制成的人工间隔区、或IgG(如人IgG4)的CH1、CH3结构域。具体来说,细胞外间隔区结构域可为(i)IgG4的铰链区、CH2区和CH3区;(ii)IgG4的铰链区;(iii)IgG4的铰链和CH2;(iv)CD8α的铰链区;(v)IgG1的铰链区、CH2区和CH3区;(vi)IgG1的铰链区;或(vi)IgG1的铰链和CH2或其组合。另外的细胞外间隔区结构域将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
掩蔽的嵌合抗原受体的跨膜结构域
本发明的mCAR还可包含跨膜结构域。跨膜结构域可包含来自具有跨膜结构域的任何蛋白质的跨膜序列,包括I型、II型或III型跨膜蛋白中的任一种。本发明的mCAR的跨膜结构域还可包含人工疏水序列。可选择本发明的mCAR的跨膜结构域以免二聚化。另外的跨膜结构域将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
掩蔽的嵌合抗原受体的细胞内信号传导结构域
本发明的mCAR还可包含细胞内信号传导结构域。此结构域可为细胞质的并且可转导效应子功能信号并指导细胞执行其专门功能。细胞内信号传导结构域的实例包括但不限于T细胞受体的ζ链或其任何同系物(例如,η链、FcεR1γ和β链、MB1(Igα)链、B29(Igβ)链等)、CD3多肽(Δ、δ和ε)、syk家族酪氨酸激酶(Syk、ZAP 70等)、src家族酪氨酸激酶(Lck、Fyn、Lyn等)及T细胞转导中所涉及的其它分子,如CD2、CD5和CD28。具体来说,细胞内信号传导结构域可为人CD3ξ链、FcγRIII、FcεRI、Fc受体的细胞质尾、携带细胞质受体的基于免疫受体酪氨酸的活化基序(ITAM)或其组合。另外的细胞内信号传导结构域将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
mCAR中的接头
在一些实施方案中,本发明的mCAR的两种或更多种组分是由一个或多个接头分隔开。在一些实施方案中,掩蔽肽的组分(掩蔽物和切割位点)是由接头序列分隔开。在一些实施方案中,掩蔽肽是通过接头序列连接到CAR上。接头为长度约1至100个氨基酸的寡肽或多肽区,其将本发明的CAR的任何结构域/区连接在一起。在一些实施方案中,接头可为例如5-12个氨基酸长、5-15个氨基酸长或5-20个氨基酸长。接头可由像甘氨酸和丝氨酸的柔性残基组成以便相邻的蛋白质结构域相对于彼此自由地移动。更长的接头(例如长于100个氨基酸的接头)可结合本发明的替代实施方案使用,并且可被选出以例如确保两个相邻结构域不在空间上相互干扰。可在本发明中使用的接头的实例包括但不限于2A接头(例如T2A)、2A样接头或其功能等效物。
如上所述,本发明的mCAR可作为单一多肽链来合成。在一个实施方案中,编码未切割的mCAR的单一多肽链具有以下从N-末端至C-末端的结构排列:掩蔽物-接头-切割位点-接头-抗原特异性靶向结构域-跨膜结构域-共刺激结构域-细胞内信号传导结构域。另外的序列可存在于每个结构域之间,以便例如对mCAR提供进一步的柔性和稳定性。
在一个实施方案中,编码未切割的mCAR的单一多肽链具有以下从N-末端至C-末端的结构排列:掩蔽物-接头-切割位点-接头-抗原特异性靶向结构域-细胞外间隔区结构域-跨膜结构域-共刺激结构域-细胞内信号传导结构域。另外的序列可存在于每个结构域之间,以便例如对mCAR提供进一步的柔性和稳定性。
嵌合抗原受体的抗原特异性靶向结构域的靶标
在一些实施方案中,mCAR的抗原特异性靶向结构域靶向对以下疾病有特异性的抗原:癌症、炎性疾病、神经元病症、糖尿病、心血管疾病、感染性疾病或其组合。可由本发明的mCAR所靶向的抗原的实例包括但不限于B细胞上表达的抗原;癌瘤、肉瘤、淋巴瘤、白血病、生殖细胞肿瘤、胚细胞瘤上表达的抗原;各种免疫细胞上表达的抗原;及与各种血液疾病、自身免疫疾病和/或炎性疾病相关的细胞上表达的抗原。本发明的mCAR能够将表达细胞的效应子功能重定向至两种靶抗原的任一者。当使用单一抗原特异性靶向例如基因不稳定的B细胞谱系恶性肿瘤时,构建体的此特征可克服抗原丢失的逃逸变体的问题。
可由本文所述的mCAR所靶向的对癌症有特异性的抗原包括但不限于以下任一种或多种:4-1BB、5T4、腺癌抗原、α-甲胎蛋白、BAFF、B-淋巴瘤细胞、C242抗原、CA-125、碳酸酐酶9(CA-IX)、C-MET、CCR4、CD152、CD19、CD20、CD200、CD22、CD221、CD23(IgE受体)、CD28、CD30(TNFRSF8)、CD33、CD4、CD40、CD44v6、CD51、CD52、CD56、CD74、CD80、CEA、CNTO888、CTLA-4、DR5、EGFR、EpCAM、CD3、FAP、纤连蛋白额外结构域-B、叶酸受体1、GD2、GD3神经节苷脂、糖蛋白75、GPNMB、HER2/neu、HGF、人分散因子受体激酶、IGF-1受体、IGF-I、IgG1、L1-CAM、IL-13、IL-6、胰岛素样生长因子I受体、整联蛋白α5β1、整联蛋白αvβ3、MORAb-009、MS4A1、MUC1、粘蛋白CanAg、N-乙醇酰神经氨酸、NPC-1C、PDGF-Rα、PDL192、磷脂酰丝氨酸、前列腺癌细胞、RANKL、RON、ROR1、SCH 900105、SDC1、SLAMF7、TAG-72、腱生蛋白C、TGFβ2、TGF-β、TRAIL-R1、TRAIL-R2、肿瘤抗原CTAA16.88、VEGF-A、VEGFR-1、VEGFR2、波形蛋白或其组合。对癌症有特异性的其它抗原将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
可由本文所述的mCAR靶向的对炎性疾病有特异性的抗原包括但不限于以下任一种或多种:AOC3(VAP-1)、CAM-3001、CCL11(嗜酸性细胞活化趋化因子-1)、CD125、CD147(基础免疫球蛋白(basigin))、CD154(CD40L)、CD2、CD20、CD23(IgE受体)、CD25(IL-2受体的α链)、CD3、CD4、CD5、IFN-α、IFN-γ、IgE、IgE Fc区、IL-1、IL-12、IL-23、IL-13、IL-17、IL-17A、IL-22、IL-4、IL-5、IL-5、IL-6、IL-6受体、整联蛋白α4、整联蛋白α4β7、大羊驼(Lamaglama)、LFA-1(CD11a)、MEDI-528、肌生长抑制素、OX-40、rhuMAbβ7、硬化蛋白(scleroscin)、SOST、TGFβ1、TNF-α或VEGF-A。对炎性疾病有特异性的其它抗原将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
可由本文所述的mCAR靶向的对神经元病症有特异性的抗原包括但不限于β淀粉样蛋白或MABT5102A中的任一种或多种。对神经元病症有特异性的其它抗原将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
可由本文所述的mCAR所靶向的对糖尿病有特异性的抗原包括但不限于L-1β或CD3中的任一种或多种。对糖尿病或其它代谢病症有特异性的其它抗原将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
可由本文所述的mCAR所靶向的对心血管疾病有特异性的抗原包括但不限于以下任一种或多种:C5、心肌肌球蛋白、CD41(整联蛋白α-IIb)、纤维蛋白II、β链、ITGB2(CD18)及鞘氨醇-1-磷酸。对心血管疾病有特异性的其它抗原将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
可由本文所述的mCAR所靶向的对感染性疾病有特异性的抗原包括但不限于以下任一种或多种:炭疽毒素、CCR5、CD4、聚集因子A、巨细胞病毒、巨细胞病毒糖蛋白B、内毒素、大肠杆菌、乙型肝炎表面抗原、乙型肝炎病毒、HIV-1、Hsp90、甲型流感血球凝集素、脂磷壁酸、绿脓假单胞菌、狂犬病病毒糖蛋白、呼吸道合胞病毒及TNF-α。对感染性疾病有特异性的其它抗原将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
可由所述的mCAR所靶向的靶抗原的其它实例包括但不限于以特异性或扩增方式见于癌细胞上的表面蛋白(例如,B细胞淋巴瘤的IL-14受体、CD19、CD20及CD40;多种癌瘤的Lewis Y和CEA抗原;乳腺癌和结肠直肠癌的Tag72抗原;肺癌的EGF-R;经常在人乳腺癌和卵巢癌中扩增的叶酸结合蛋白和HER-2蛋白)、或病毒蛋白(例如,HIV的gp120和gp41包膜蛋白;乙型肝炎和丙型肝炎病毒的包膜蛋白;人巨细胞病毒的糖蛋白B及其它包膜糖蛋白;来自致癌病毒如卡波西氏肉瘤(Kaposi's sarcoma)相关的疱疹病毒的包膜蛋白)。本发明的CAR的其它潜在靶标包括CD4,其中配体为HIV gp120包膜糖蛋白;及其它病毒受体,例如ICAM,其为人鼻病毒的受体,及脊髓灰质炎病毒的相关受体分子。
本发明的mCAR的另外的靶标包括B细胞相关疾病中所涉及的抗原。本发明的mCAR的又一些靶标将为本领域技术人员显而易见并且可结合本发明的替代实施方案使用。
基因工程化的细胞
本发明还提供了基因工程化的细胞,其包含并稳定地表达本文所述的mCAR。由基因工程化的细胞表达的mCAR包含掩蔽肽、至少一个抗原特异性靶向结构域、任选的细胞外结构域、跨膜结构域、一个或多个共刺激结构域及细胞内信号传导结构域。编码mCAR的多核苷酸序列还可包含N-末端信号序列。
基因工程化的细胞表达本文所述的mCAR。在一个实施方案中,抗原特异性靶向结构域包含靶标特异性抗体或其功能等效物或片段或衍生物。抗原特异性抗体可为抗体的Fab片段或抗体的单链可变片段(scFv)。
可包含并表达本发明的mCAR的基因工程化的细胞包括但不限于T-淋巴细胞(T细胞)、天然T细胞(TN)、记忆T细胞(例如,中心记忆T细胞(TCM)、效应记忆细胞(TEM))、天然杀伤细胞、造血干细胞和/或能够产生治疗相关子代的多能胚胎/诱导的干细胞。在一个实施方案中,基因工程化的细胞为自体细胞。举例来说,本发明的个别T细胞可为CD4+/CD8-、CD4-/CD8+、CD4-/CD8-或CD4+/CD8+。T细胞可为CD4+/CD8-与CD4-/CD8+细胞的混合群或单克隆的群。本发明的CD4+T细胞当与表达靶抗原的细胞在体外共培养时可产生IL-2、IFNγ、TNFα及其它T细胞效应细胞因子。本发明的CD8+T细胞当与靶细胞在体外共培养时可溶解抗原特异性靶细胞。在一些实施方案中,T细胞可为以下任一种或多种:CD45RA+CD62L+天然细胞、CD45RO+CD62L+中心记忆细胞、CD62L-效应记忆细胞或其组合(Berger等人,Adoptivetransfer of virus-specific and tumor-specific T cell immunity.Curr OpinImmunol 2009 21(2)224-232)。
基因修饰的细胞可通过用编码本文所述的mCAR的DNA稳定转染细胞而产生。病毒载体通常用于将异源基因携带到细胞(例如T细胞)中。可用于产生基因修饰的细胞的病毒载体的实例包括但不限于SIN慢病毒载体、逆转录病毒载体、泡沫病毒载体、腺相关病毒(AAV)载体和/或质粒转座子(例如,睡美人转座子系统)。
各种方法可产生表达本发明的mCAR的稳定转染子。在一个实施方案中,稳定转染并重定向细胞的方法是通过使用裸DNA进行电穿孔而实现。通过使用裸DNA,可明显缩短产生重定向细胞所需的时间。使用编码本发明的mCAR的裸DNA使细胞基因工程化的另外方法包括但不限于化学转化法(例如,使用磷酸钙、树枝状分子、脂质体和/或阳离子聚合物)、非化学转化法(例如,电穿孔、光学转化、基因电转移和/或流体动力学递送)和/或基于颗粒的方法(例如,刺穿转染(impalefection)、使用基因枪和/或磁转染)。显示存在单整合的非重排载体和mCAR的表达的转染的细胞可离体扩增。在一个实施方案中,为离体扩增选出的细胞为CD8+并且显示出特异性地识别并裂解抗原特异性靶细胞的能力。
病毒转导方法也可用于产生表达本发明的mCAR的重定向细胞。可用于产生表达本发明的mCAR的基因修饰细胞的细胞类型包括但不限于T-淋巴细胞(T细胞)、天然杀伤细胞、造血干细胞和/或能够产生治疗相关子代的多能胚胎/诱导的干细胞。
在适当条件下由抗原刺激T细胞导致细胞的增殖(扩增)和/或IL-2的产生。包含本发明的mCAR的细胞将应答于一种或多种抗原与mCAR的抗原特异性靶向结构域的结合在数量上扩增。本发明还提供一种制备并扩增表达mCAR的细胞的方法。所述方法包括用表达mCAR的载体转染或转导细胞并用表达靶抗原、重组靶抗原或针对受体的抗体的细胞刺激细胞以引起细胞增殖,由此制备和扩增T细胞。在一个实施方案中,细胞可为以下任一种或多种:T-淋巴细胞(T细胞)、天然杀伤(NK)细胞、造血干细胞(HSC)或能够产生治疗相关子代的多能胚胎/诱导的干细胞。
治疗方法
本文提供了用于在有此需要的受试者中治疗与由本文所述的mCAR所靶向的抗原相关的疾病的方法。所述方法包括提供包含本文所述的mCAR的组合物及施用有效量的所述组合物以便在受试者中治疗与抗原有关的疾病。
本文提供了用于在有此需要的受试者中治疗、抑制、减缓癌扩散的进展和/或预防癌扩散的方法。所述方法包括提供包含本文所述的mCAR的组合物及施用有效量的所述组合物以便在受试者中治疗、抑制、减缓癌扩散的进展和/或预防癌扩散。
在一些实施方案中,所述组合物包含编码mCAR的多核苷酸、包含mCAR的蛋白质或包含mCAR的基因修饰的细胞。在另一实施方案中,组合物的基因修饰的细胞为T-淋巴细胞(T细胞)、天然T细胞(TN)、记忆T细胞(例如,中心记忆T细胞(TCM)、效应记忆细胞(TEM))、天然杀伤(NK)细胞、造血干细胞(HSC)或能够产生治疗相关子代的多能胚胎/诱导的干细胞,其表达本发明的mCAR。本发明的组合物可单独或结合现有疗法施用。如果结合其它疗法使用,则本发明组合物可与其它现有疗法同时或依次施用。
在一些实施方案中,在有此需要的受试者中治疗、抑制、减缓癌扩散的进展和/或预防癌扩散包括施用有效量的包含本文所述的mCAR的组合物以及现有疗法。在各种实施方案中,包含mCAR的组合物可与现有疗法依次或同时施用。现有癌症治疗的实例包括但不限于主动监测、观察、手术介入、化疗、免疫疗法、放射疗法(如外部光束放射、立体定向放射手术(γ刀)及分次立体定向放射疗法(FSR))、局灶疗法、全身疗法、疫苗疗法、病毒疗法、分子靶向疗法或其组合。
化疗剂的实例包括但不限于白蛋白结合的紫杉醇(nab-紫杉醇)、放线菌素、阿屈替诺(Alitretinoin)、全反式视黄酸、阿扎胞苷、硫唑嘌呤(Azathioprine)、贝伐单抗、贝沙罗汀(Bexatotene)、博来霉素、硼替佐米、卡铂、卡培他滨、西妥昔单抗、顺铂、苯丁酸氮芥、环磷酰胺、阿糖胞苷、柔红霉素、多西他赛、去氧氟尿苷、阿霉素、表柔比星、埃博霉素、埃罗替尼、依托泊苷、氟尿嘧啶、吉非替尼、吉西他滨、羟基脲、伊达比星、伊马替尼、易普利单抗、依立替康、氮芥、美法仑、巯基嘌呤、氨甲蝶呤、米托蒽醌、奥瑞珠单抗(Ocrelizumab)、奥法木单抗、奥沙利铂、紫杉醇、帕尼单抗、培美曲塞、利妥昔单抗、他氟泊苷(Tafluposide)、替尼泊苷、硫鸟嘌呤、拓扑替康、维甲酸、戊柔比星、维罗非尼、长春花碱、长春新碱、长春地辛、长春瑞滨、伏立诺他、罗咪酯肽(Romidepsin)、5-氟尿嘧啶(5-FU)、6-巯基嘌呤(6-MP)、克拉屈滨、氯法拉滨、氟尿苷、氟达拉滨、喷司他丁、丝裂霉素、伊沙匹隆、雌氮芥或其组合
在各种实施方案中,包含本文所述的mCAR的组合物的有效量为以下任一个或多个:约0.01至0.05μg/kg/天、0.05-0.1μg/kg/天、0.1至0.5μg/kg/天、0.5至5μg/kg/天、5至10μg/kg/天、10至20μg/kg/天、20至50μg/kg/天、50至100μg/kg/天、100至150μg/kg/天、150至200μg/kg/天、200至250μg/kg/天、250至300μg/kg/天、300至350μg/kg/天、350至400μg/kg/天、400至500μg/kg/天、500至600μg/kg/天、600至700μg/kg/天、700至800μg/kg/天、800至900μg/kg/天、900至1000μg/kg/天、0.01至0.05mg/kg/天、0.05-0.1mg/kg/天、0.1至0.5mg/kg/天、0.5至1mg/kg/天、1至5mg/kg/天、5至10mg/kg/天、10至15mg/kg/天、15至20mg/kg/天、20至50mg/kg/天、50至100mg/kg/天、100至200mg/kg/天、200至300mg/kg/天、300至400mg/kg/天、400至500mg/kg/天、500至600mg/kg/天、600至700mg/kg/天、700至800mg/kg/天、800至900mg/kg/天、900至1000mg/kg/天或其组合。本文所述的mCAR的有效量的典型剂量可在制造商推荐的范围内,其中使用已知的治疗性化合物,并且还由熟练技术人员通过体外应答或动物模型中的应答表明。这种剂量通常可减少多至约一个数量级的浓度或量,而不会损失相关生物活性。实际剂量可取决于内科医师的判断、患者的病状、及基于例如相关培养细胞或组织培养的组织样品(如活检恶性肿瘤)的体外应答或在适当的动物模型中观察到的应答的治疗方法的有效性。在各种实施方案中,包含本文所述的mCAR的本发明组合物可每天一次(SID/QD)、每天两次(BID)、每天三次(TID)、每天四次(QID)或更多次施用,以便向受试者施用有效量的mCAR,其中有效量为任一个或多个本文所述的剂量。
药物组合物
在各种实施方案中,本发明提供药物组合物,其包含药学上可接受的赋形剂和治疗有效量的本文所述的mCAR。组合物中的mCAR可为以下任一种或多种:编码mCAR的多核苷酸、包含mCAR的蛋白质或包含mCAR的基因修饰的细胞。“药学上可接受的赋形剂”意指适用于制备药物组合物的赋形剂,其一般为安全、无毒和所需的,并且包括可为兽医使用所接受及人类药物使用所接受的赋形剂。这种赋形剂可为固体、液体、半固体或在气溶胶组合物的情况下可为气态的。
在各种实施方案中,根据本发明的药物组合物可被配制以经由任何施用途径递送。“施用途径”可指的是本领域中已知的任何施用途径,包括但不限于气溶胶、鼻、经口、静脉内、肌内、腹膜内、吸入、经粘膜、经皮、胃肠外、可植入泵、连续输注、局部施用、胶囊和/或注射。
根据本发明的药物组合物还可含有任何药学上可接受的载体。如本文所用的“药学上可接受的载体”是指药学上可接受的材料、组合物或媒介物,其牵涉于将目标化合物从身体的一个组织、器官或部分运载或转运到身体的另一个组织、器官或部分。例如,载体可为液体或固体填充剂、稀释剂、赋形剂、溶剂或包囊材料或其组合。载体的每个组分必须为“药学上可接受的”,因为其必须与制剂的其它成分相容。其必须还适于与其可能接触的任何组织或器官接触使用,这意味着其不能具有毒性、刺激、过敏反应、免疫原性或大大超过其治疗益处的任何其它并发症的风险。
根据本发明的药物组合物还可被囊封、压片或在乳剂或糖浆剂中制备以供经口施用。可添加药学上可接受的固体或液体载体以增强或稳定化组合物或便于组合物的制备。液体载体包括糖浆剂、花生油、橄榄油、甘油、盐水、乙醇及水。固体载体包括淀粉、乳糖、硫酸钙、二水合物、石膏粉、硬脂酸镁或硬脂酸、滑石、果胶、阿拉伯胶、琼脂或明胶。载体还可包括持续释放材料,如单硬脂酸甘油酯或二硬脂酸甘油酯,单独或与蜡一同使用。
药物制剂按照制药的常规技术,包括研磨、混合、造粒、当对于片剂需要时可压片、或对于硬明胶胶囊形式还有研磨、混合和填充来制备。当使用液体载体时,制剂将呈糖浆剂、酏剂、乳剂或水性或非水性混悬剂的形式。这种液体制剂可直接经口施用或填充到软明胶胶囊中。
根据本发明的药物组合物可以治疗有效量递送。精确的治疗有效量为就治疗在给定受试者中的功效而言将产生最有效结果的组合物的量。此量将随以下多种因素而变化,包括但不限于治疗化合物的特征(包括活性、药代动力学、药效学和生物利用度)、受试者的生理条件(包括年龄、性别、疾病类型和阶段、一般身体条件、对于给定剂量的反应和药物的类型)、制剂中的一种或多种药学上可接受的载体的性质、及施用途径。临床和药理学领域的技术人员将能够根据常规实验(例如通过监测受试者对施用化合物的应答并相应地调节剂量)来确定治疗有效量。关于其它指导,参见Remington:The Science and Practice ofPharmacy(Gennaro编著第20版,Williams&Wilkins PA,USA)(2000)。
实施例
提供以下实施例来更好地说明要求保护的发明并且不应被解释为限制本发明的范围。提到特定的材料仅仅是为了例示,而不是为了限制本发明。本领域技术人员可以开发等效的方法或反应物,而无需实施创造能力,且不背离本发明的范围。
实施例1
实验方法
细胞系构建:K562-EGFR细胞系通过用VSVg假型慢病毒载体稳定转导K562细胞而产生。将人EGFR的cDNA(GE Healthcare)扩增并克隆到慢病毒质粒FUW中以产生FUW-EGFR。然后产生慢病毒载体并将其用于转导K562细胞。将转导的细胞用PE/Cy7抗人EGFR抗体(Biolegend)染色并且分选以得到表达EGFR的K562细胞群。使用类似的方法生成K562-CD19细胞系。
质粒构建:通过吉布森组装EGFR scFv序列(Gibson assembling EGFR scFvsequence)、CD28跨膜结构域-41BB-CD3z共刺激结构域和主链pCCW载体来构建慢病毒载体pCCW-EGFR CAR。基于pCC W-EGFR CAR构建质粒pCCW-掩蔽EGFR CAR,其中在EGFR sc Fv区的N末端中添加经优化以表达由GS接头侧接的掩蔽肽和蛋白酶底物序列的DNA序列(QGQSGQ-CISPRGCPDGPYVMY-GSSGGS GGSGGSG-GSSGT(SEQ ID NO:12))。掩蔽肽加下划线;底物区加下划虚线。
慢病毒载体产生:通过使用标准磷酸钙沉淀方案进行293T细胞的瞬时转染来制备慢病毒载体。将在6-cm组织培养皿中培养的293T细胞用5μg慢病毒主链质粒pCCW-EGFR CAR或pCCW-掩蔽EGFR CAR连同2.5μg包膜质粒VSVG及包装质粒pMDLg/pRRE和pRSV-Rev一起转染。在转染后48小时收获病毒上清液并通过0.45-μm滤膜(Corning)过滤。
细胞系的慢病毒载体转导:将Jurkat或Jurkat-NFAT-GFP报道细胞(每孔1E5个)接种在24孔培养皿中并且在2,500rpm和25℃下用新鲜收获的病毒上清液(每孔2ml)旋转-感染90min。然后将上清液用新鲜培养基更换并在37℃和5%CO2下孵育3天。通过流式细胞术测量CAR的表达。
流式细胞术:为了检测CAR表达,将CAR-Jurkat细胞在含有4%牛血清白蛋白的PBS(洗涤缓冲液)中洗涤两次,在4℃下用2μg/ml重组人EGFR-Fc(R&D Systems)染色30min,洗涤两次,然后用R-藻红蛋白AffiniPure F(ab’)2片段山羊抗人IgG,Fcγ片段特异性(Jackson ImmunoResearch)在4℃下染色30min。将细胞洗涤两次并且再悬浮于PBS中。使用Miltenyi Biotec流式细胞仪评估荧光并用FlowJo软件分析数据。
掩蔽EGFR CAR的蛋白水解活化:掩蔽EGFR CAR的蛋白酶-介导的活化是通过在室温下将1e5个掩蔽EGFR CAR-Jurkat报道细胞与不同浓度的蛋白酶uPA(尿激酶型纤溶酶原活化物,R&D Systems)在PBS中孵育1小时来实现的。将细胞用PBS洗涤两次并在其它实验中使用。
CAR-Jurkat报道细胞与靶细胞的共培养:将1e5个EGFR CAR/掩蔽EGFR CAR-Jurkat报道细胞与2e5个靶细胞K562-EGFR或MDA-MB-231一起接种于圆底96孔板中的200μlC10培养基中。将CD19CAR-Jurkat报道细胞与K562-CD19细胞一起共培养。在37℃下孵育细胞混合物5小时。将细胞洗涤并且再悬浮于PBS中。通过流式细胞仪分析GFP荧光。
本发明人制备了具有下表1中示出的序列的抗EGFR mCAR。表1:掩蔽物呈粗体且切割位点加下划线(“Desnoyers,L.R.等人Tumor-specific activation of an EGFR-targeting probody enhances therapeutic index.Sci Transl Med 5,207ra144(2013))。
将Jurkat细胞用抗EGFR mCAR转导并且分析抗EGFR mCAR与EGFR蛋白的结合能力。如图2所示,与rhEGFR的结合能力在掩蔽EGFR CAR中与亲代抗EGFR CAR相比大大地减弱,但可在切割蛋白酶uPA之后恢复。
将Jurkat-NFAT-GFP报道细胞用抗EGFR mCAR转导并且分析抗EGFR mCAR的活化(由此在报道细胞中的GFP表达)。如图3所示,掩蔽EGFR CAR的活化与亲代抗EGFR CAR相比减弱,并在切割蛋白酶uPA之后部分恢复。
如图4所示,在分泌内源性蛋白酶的乳腺癌细胞MDA-MB-231存在下,掩蔽EGFR CAR部分活化,并且用uPA的处理进一步增强活化。
如图5所示,用更高浓度的uPA的处理造成掩蔽EGFR CAR的更多活化。
实施例2
使用组合设计和从头筛选的掩蔽的HER特异性CAR
组合设计:掩蔽的Her2-靶向的CAR是通过将曲妥珠单抗-结合肽LLGPYELWELSH(SEQ ID NO:17)(Jiang,B.等人A novel peptide isolated from a phage displaypeptide library with trastuzumab can mimic antigen epitope of HER-2.J BiolChem 280,4656-4662(2005))与肿瘤特异性切割序列LSGRSDNH(Desnoyers,L.R.等人Tumor-specific activation of an EGFR-targeting probody enhances therapeuticindex.Sci Transl Med 5,207ra144(2013)连接而产生的。将此可切割的掩蔽物融合至来源于曲妥珠单抗抗体的单链抗体CAR的N-末端(Zhao,Y.等人A Herceptin-Based ChimericAntigen Receptor with Modified Signaling Domains Leads to Enhanced Survivalof Transduced T Lymphocytes and Antitumor Activity.The Journal of Immunology183,5563-5574(2009))。使用与Her2+靶细胞共培养的T细胞报道子系测试这些CAR的中靶和脱靶活性。
从头筛选:掩蔽肽是根据其结合至基于曲妥珠单抗的Her2特异性CAR的能力(Zhao,Y.等人A Herceptin-Based Chimeric Antigen Receptor with ModifiedSignaling Domains Leads to Enhanced Survival of Transduced T Lymphocytes andAntitumor Activity.The Journal of Immunology 183,5563-5574(2009))选自细菌展示肽文库_ENREF_4的(Rice,J.J.,Schohn,A.,Bessette,P.H.,Boulware,K.T.&Daugherty,P.S.Bacterial display using circularly permuted outer membrane protein OmpXyields high affinity peptide ligands.Protein Science 15,825-836(2006))。针对稳定表达Her2特异性CAR的Jurkat T细胞系的阳性选择之后是针对基础Jurkat细胞系的阴性选择。为分离的克隆测序并且将独特的肽通过可切割的接头克隆到Her2CAR的N-末端中。掩蔽CAR是通过在肿瘤特异性蛋白酶存在下针对Her2+靶细胞的活性和在蛋白酶不存在下活性的缺乏来选择的。
实施例3
用于肿瘤特异性活化的掩蔽的嵌合抗原受体(mCAR)
表皮生长因子受体(EGFR)因为其在许多上皮肿瘤中的广泛过度表达及在EGFR表达与临床结果之间的逆相关而成为用于癌症疗法的有吸引力的靶标。已通过开发小分子抑制剂和靶向EGFR的单克隆抗体获得相当大的成功,尽管在皮肤、肾脏和胃肠系统中观察到处理毒性,这是因为EGFR在这些健康组织中的表达。举例来说,西妥昔单抗,一种针对人EGFR的人小鼠嵌合单克隆抗体,已被批准用于结肠癌及头颈癌中,但皮疹和腹泻是由内源性EGFR在上皮组织中的表达引起的最常见的副作用。一种提高西妥昔单抗的治疗指数的方法是开发一种前体,即在健康环境中保持无反应但在肿瘤中由肿瘤相关蛋白酶活化的基于抗体的前药。
在此,使用来自源于西妥昔单抗的前体的序列构建EGFR特异性CAR。此掩蔽的CAR(mCAR)含有能够阻断与EGFR的抗体结合位点的N-末端掩蔽肽和对肿瘤相关蛋白酶敏感的接头。此设计使得CAR-T细胞能够在健康组织中遇到抗原后保持惰性,但在肿瘤微环境中通过经由蛋白水解切割暴露抗原结合位点而变得活化,由此允许识别和杀灭肿瘤细胞。
实验方法
构建质粒。基于MP71逆转录病毒载体(Engels,B.等人(2003).Retroviralvectors for high-level transgene expression in T lymphocytes.Hum Gene Ther14:1155-1168)构建编码未掩蔽的EGFR CAR的逆转录病毒载体(RV-umCAR)。RV-umCAR载体由以下组分在框内从5′端至3′端组成:MP71逆转录病毒主链、NotI位点、抗EGFR scFv轻链可变区、GS接头、抗EGFR scFv重链可变区、CD8α分子的铰链区和跨膜区、CD28和4-1BB(CD137)的细胞质结构域、CD3ζ信号传导结构域及EcoRI位点。
未掩蔽的CAR中的抗EGFR scFv部分来源于西妥昔单抗的氨基酸序列。使用在线密码子优化工具对scFv的相应DNA序列进行密码子优化以供其在人细胞中的最佳表达并且通过整合DNA技术(Coralville,IA)合成该DNA序列。通过使用来自New England Biolab(Ipswich,MA)的吉布森组装克隆试剂盒来吉布森组装所有片段以生成未掩蔽的EGFR CAR序列,然后经由NotI和EcoRI连接到MP71主链载体中。吉布森组装中使用的引物如下:正向引物(NotI),tta cGC GGC CGC gcc acc atg gct ctg cct gt;反向引物(EcoRI),tta GAATTC tca tct tgg tgg cag agc ctg c。大写代表用于限制酶消化的靶序列。
基于未掩蔽的EGFR CAR构建体克隆掩蔽的和NSUB EGFR C AR构建体。将编码侧接有GS接头的掩蔽肽(加下划线)和蛋白酶底物序列(加下划虚线)(氨基酸序列:QGQSGQCISPRGCPDGPYVMY-GS SGGSGGSGGSG-GSSGT(SEQ ID NO:12))的DNA序列(如来源于先前报告,(Desnoyers,LR等人(2013).Tumor-specific act ivation of anEGFR-targeting probody enhances therapeutic index.S ci Transl Med 5:207ra144))进行密码子优化,然后克隆到未掩蔽的C AR构建体中的scFv区的N-末端中。对于NSUB CAR构建体,将蛋白酶底物序列用GS接头序列(加下划虚线)置换(QGQSGQCISPRGCPDGPYVMY-GSSGGSGGSGGSG-GSSGT(SEQ ID NO:12)),然后克隆到未掩蔽的CAR构建体的N-末端中。
通过以下步骤构建编码长臂猿白血病病毒糖蛋白(GALV)的包膜质粒(pGALV)。GALV的cDNA是从PG13细胞系的基因组DNA进行PCR扩增而来的(Ghani,K等人(2009).Efficient human hematopoietic cell transduction using RD114-and GALV-pseudotyped retroviral vectors produced in suspension and serum-freemedia.Hum Gene Ther 20:966-974)。用于克隆的引物为正向引物(EcoRI),tat GAA TTCgcc acc atg gta ttg ctg cct ggg tcc(SEQ ID NO:18);和反向引物(EcoRI),gcg GAATTC tta aag gtt acc ttc gtt ctc tag ggc(SEQ ID NO:19)。然后将所得的PCR片段经由EcoRI位点克隆到来自Addgene(Cambridge,MA)的pHCMV质粒主链中。
通过将PCR扩增的人EGFR的cDNA经由SalI和XbaI插入到pENTR质粒中产生编码人EGFR的慢病毒载体(FUW-EGFR),然后使用来自Thermo Fisher Scientific(Grand Island,NY)的Gateway克隆试剂盒将EGFR基因经由LR反应克隆到慢病毒载体FUW中。用于克隆的引物为正向引物(SalI),tat GTC GAC atg cga ccc tcc ggg acg gcg GAA TTC tta aaggtt acc ttc gtt ctc tag ggc(SEQ ID NO:20);和反向引物(XbaI),tcg TCT AGA ccttca ctg tgt ctg caa atc tgc c(SEQ ID NO:21)。
细胞系和培养基。细胞系K562、293T和MDA-MB-231获自ATCC。肺癌细胞系NCI-H292是由Ite Laird-Offringa博士(University of Southern California,Los Angeles,CA)友好提供。K562-EGFR细胞系是通过用慢病毒载体FUW-EGFR转导亲代K562细胞而产生的。将转导的K562细胞用抗人EGFR抗体(BioLegend,San Diego,CA)染色并且分选以得到过度表达EGFR的K562细胞群。
将K562和K562-EGFR细胞维持在由RPMI-1640培养基组成的R10培养基中,该RPMI-1640培养基补充有10%胎牛血清(FBS)、2mM L-谷氨酰胺、10mM HEPES、100U/ml青霉素和100μg/ml链霉素。将293T和MDA-MB-231细胞在由DMEM培养基组成的D10培养基中培养,该DMEM培养基补充有10%FBS、2mM L-谷氨酰胺、100U/ml青霉素和100μg/ml链霉素。上述所有细胞培养基和添加剂都购自Hyclone(Logan,UT)。将人外周血单核细胞(PBMC)在由X-Vivo15培养基(Lonza,Walkersville,MD)组成的T细胞培养基(TCM)中培养,该X-Vivo 15培养基补充有5%人AB血清(GemCell,West Sacramento,CA)、1%HEPES(Gibco,Grand Island,NY)、1%Pen-Strep(Gibco)、1%GlutaMax(Gibco)和0.2%N-乙酰半胱氨酸(Sigma-Aldrich,St.Louis,MO)。
逆转录病毒载体产生。逆转录病毒载体通过使用标准磷酸钙沉淀方案瞬时转染293T细胞来制备。将在15-cm组织培养皿中培养的293T细胞用37.5μg逆转录病毒主链质粒连同18.75μg包膜质粒pGALV和30μg编码gag-pol的包装质粒一起进行转染。在转染后48小时和72小时收获病毒上清液并在使用前经由0.45-μm滤膜(Corning,Corning,NY)过滤。
T细胞转导和扩增。冷冻的人外周血单核细胞(PBMC)获自AllCells(Alameda,CA)。将PBMC在TCM中解冻并静置过夜。在逆转录病毒转导之前,通过与50ng/ml OKT3、50ng/ml抗CD28抗体及10ng/mL重组人IL-7和IL-15(PeproTech,Rocky Hill,NJ)一起培养活化PBMC持续2天。对于转导,将新鲜收获的逆转录病毒上清液在32℃下通过在2000×g下离心2小时旋转装载到经15μg retronectin/孔(Clontech Laboratories,Mountain View,CA)包被的经非组织培养物-处理的12孔板上。用新鲜的病毒上清液重复载体的旋转装载一次(Kochenderfer,JN等人(2009).Construction and preclinical evaluation of ananti-CD19chimeric antigen receptor.J Immunother 32:689-702)。将活化的PBMC以5×105/ml的浓度用补充有10ng/mL重组人IL-7和IL-15的新鲜TCM再悬浮并且添加到装有载体的板中。将该板在32℃下在1000×g下旋转10分钟并且在37℃和5%CO2下孵育过夜。在第二天重复相同的转导程序。在离体扩增期间,补足培养基并且每两天调整细胞密度至5×105/ml。在此项研究中,应注意细胞因子IL-7和IL-15的组合用于离体扩增CAR-T细胞,而不是更为广泛地用于实验和临床方案中的IL-2。选择此细胞因子条件,因为据报道在IL-7和IL-15存在下培养的基因工程化的T细胞造成在NSG小鼠中的植入改善(Cieri,N等人(2013).IL-7and IL-15instruct the generation of human memory stem T cells from naiveprecursors.Blood 121:573-584;Alcantar-Orozco等人(2013).Potential limitationsof the NSG humanized mouse as a model system to optimize engineered human Tcell therapy for cancer.Hum Gene Ther Methods 24:310-320)。
表面免疫染色和流式细胞术。为了检测在细胞表面上的EGFR CAR表达,用蛋白L或重组人EGFR-Fc融合蛋白(rhEGFR-Fc)染色细胞。FACS染色之前,收获1×106个细胞并用FACS缓冲液(含有4%牛血清白蛋白级分V的PBS)洗涤三次。对于蛋白L染色,将细胞在4℃下用0.5μg生物素化的蛋白L(GeneScript,Piscataway,NJ)染色30分钟(Zheng,ZL等人(2012).Protein L:a novel reagent for the detection of Chimeric AntigenReceptor(CAR)expression by flow cytometry.Journal of Translational Medicine10:29)。将细胞用FACS缓冲液洗涤三次,然后在4℃下与0.1μg APC缀合的链霉亲和素(BioLegend,San Diego,CA)一起在FACS缓冲液中孵育10分钟并且洗涤三次。对于rhEGFR-Fc染色,将细胞在4℃下在FACS缓冲液中用2μg/ml重组人EGFR-Fc(R&D Systems,Minneapolis,MN)染色30min,洗涤两次,然后在4℃下在FACS缓冲液中用山羊抗人IgG的PE-AffiniPure F(ab’)2片段(Jackson ImmunoResearch,West Grove,PA)染色30min。将细胞洗涤两次并且再悬浮于PBS中。使用Miltenyi Biotec流式细胞仪评估荧光并且用FlowJo软件分析所有FACS数据。
掩蔽的EGFR CAR的蛋白水解活化:掩蔽的EGFR CAR的蛋白酶介导的活化是通过在室温下将1×106个掩蔽的EGFR CAR-T细胞与不同浓度的尿激酶型纤溶酶原活化物蛋白酶(uPA,R&D Systems)在PBS中孵育1小时而实现的。然后将细胞用PBS洗涤两次并用于后续结合和染色实验。
细胞内细胞因子染色。在37℃和5%CO2下将T细胞(1×106)与靶细胞以1:1的比率在96孔圆底板中用GolgiPlug(BD Biosciences,San Jose,CA)共培养6小时。将PE-Cy5.5-抗CD3抗体、APC-Cy7-抗CD4抗体、太平洋蓝CD8抗体和PE-抗IFN-γ用于免疫染色。所有抗体都购自BioLegend。Cytofix/Cytoperm固定和渗透试剂盒(BD Biosciences)用于渗透细胞膜并且根据制造商说明书进行细胞内染色。
特异性细胞裂解测定。通过相对于阴性对照细胞K562的存活比较靶细胞K562-EGFR的存活来测量靶细胞K562-EGFR的裂解。此方法先前已经描述(Kochenderfer,JN等人(2009).Construction and preclinical evaluation of an anti-CD19chimericantigen receptor.JImmunother 32:689-702)。将K562细胞通过将其以1.5×106个细胞/mL的浓度悬浮于具有5μM荧光染料CMTMR(Invitrogen,Carlsbad,CA)的R10培养基中来标记。将细胞在37℃下孵育30分钟,然后洗涤两次并且悬浮于新鲜的R10培养基中。将K562-EGFR细胞通过将其以1×106个细胞/mL的浓度悬浮于具有5μM荧光染料CFSE的PBS+0.1%BSA中来标记。在37℃下孵育细胞30分钟。在孵育之后,将相同体积的FBS添加到细胞悬浮液中,然后在室温下孵育2分钟。然后洗涤细胞两次并且悬浮于新鲜的R10培养基中。将相等数目的K562和K562-EGFR细胞(各5×104个)合并于同一孔中以用于与效应CAR-T细胞的每次培养。将共培养物一式三份以以下的效应细胞与靶细胞比率设于圆底96孔板中:1:1、3:1和10:1。将培养物在37℃下孵育4小时,继之根据制造商说明书(BD Biosciences)进行7-AAD标记。进行流式细胞分析以量化剩余的活(7-AAD-阴性)靶细胞。对于每次共培养,通过将活的K562-EGFR的百分比除以活的K562细胞的百分比来测定K562-EGFR的存活百分比。在仅含靶细胞和阴性对照细胞而无效应细胞的孔中,计算K562-EGFR的百分比与K562细胞的百分比的比率并且用于校正初始细胞数目和自发细胞死亡中的变化。一式三份测定细胞毒性并且以平均值±SEM呈现。
对于NCI-H292和MDA-MB-231靶细胞,如上所述测定特异性细胞裂解,伴有以下差异。用CFSE标记靶细胞。在37℃下将靶细胞(5×104)与效应细胞一起培养18小时。通过将具有效应细胞的活靶细胞数目除以无效应细胞的活靶细胞数目来测定靶细胞的存活百分比。
CAR-T细胞在非小细胞肺癌异种移植物小鼠模型中的抗肿瘤功效。根据经USC实验动物照护及使用委员会(Institutional Animal Care and Use Committee)(IACUC)批准的动物方案进行动物实验。将六至八周龄的雌性NOD.Cg-PrkdcscidIL2Rgtm1Wjl/Sz(NSG)小鼠(Jackson Laboratory,Farmington,CT)用于此项研究中。在第0天,将悬浮于1:1稀释于RPMI培养基中的总计150μL基质胶(Corning,New York,NY)中的6×106个NCI-H292细胞注射到每只NSG小鼠的右侧腹中。当平均肿瘤尺寸在第12天达到120mm3时,所有小鼠基于肿瘤尺寸被随机化并分配到4个组(n=8)中。将小鼠用4百万个在150μL PBS中的CAR-T细胞处理,分别在第13天和第26天经由尾静脉注射静脉内施用两次。在所有CAR组中藉由添加供体匹配的未转导的T细胞将CAR表达归一化为30%。每周两次监测肿瘤生长。用卡尺测量肿瘤尺寸并通过下式来计算:L×W×H/2。当小鼠呈现明显的重量减轻、肿瘤溃疡或大于1000mm3的肿瘤尺寸时对它们施以安乐死。
统计分析。在GraphPad Prism,5.01版中进行统计分析。进行单向ANOVA和Tukey多重比较以评估体外测定中的不同组中的差异。使用单向ANOVA和重复测量(Sidak多重比较法)分析肿瘤生长曲线。通过Kaplan-Meier分析(对数秩检验和Bonferroni校正)评价小鼠存活曲线。小于0.05的P值被认为是统计上显著的。发现的显著性被定义为:ns=不显著的,P>0.05;*,P<0.05;**,P<0.01;***,P<0.001。
掩蔽的CAR的设计和产生
鉴于4-1BB胞内域的已知抗细胞凋亡效应和CD28胞内域对所需CAR功能的有效细胞毒性(van der Stegen等人(2015).Thepharmacology of second-generation chimericantigen receptors.Nat Rev Drug Discov 14:499-509;Rice,JJ等人(2006).Bacterialdisplay using circularly permuted outer membrane protein OmpX yields highaffinity peptide ligands.Protein Science 15:825-836),为此项研究构建靶向人EGFR的各种形式的第三代CAR分子(图1a,b)。这些CAR是由来源于单克隆抗体西妥昔单抗的单链可变片段(scFv)、CD8α铰链和跨膜结构域、CD28和4-1BB共刺激结构域、以及CD3ζT细胞受体信号传导结构域组成的。
对于mCAR,使用来自西妥昔单抗的前体的氨基酸序列将掩蔽肽连同可切割的接头序列一起引入scFv结构域的上游(Desnoyers,LR等人(2013).Tumor-specific activationof an EGFR-targeting probody enhances therapeutic index.Sci Transl Med 5:207ra144)。通过细菌展示选择掩蔽肽以结合西妥昔单抗的抗原识别结构域(Rice,JJ等人(2006).Bacterial display using circularly permuted outer membrane proteinOmpX yields high affinity peptide ligands.Protein Science 15:825-836),由此阻断其结合至EGFR的能力。通过使用肽底物的细胞文库(CLiPS)(Boulware,KT和Daugherty,PS(2006).Protease specificity determination by using cellular libraries ofpeptide substrates(CLiPS).Proc Natl Acad Sci USA 103:7583-7588)关于其对多个肿瘤相关蛋白酶的反应性进行选择来确定接头序列,所述肿瘤相关蛋白酶包括尿激酶型纤溶酶原活化物(uPA)、膜型丝氨酸蛋白酶1(MT-SP1/蛋白裂解酶(matriptase))及豆荚蛋白,所有这些在众多人肿瘤的肿瘤微环境中都上调(Desnoyers,LR等人(2013).Tumor-specificactivation of an EGFR-targeting probody enhances therapeutic index.Sci TranslMed5:207ra144)。常规的未掩蔽的CAR(无掩蔽肽和接头序列)被构建作为对照。还产生了含有相同的掩蔽肽但缺乏对蛋白酶切割敏感的接头的对照CAR构建体,且将其表示为NSUB(无蛋白酶底物序列)CAR。NSUB CAR反倒具有不可切割的富GS接头。将所有这些CAR都克隆到逆转录病毒载体中以便向人T细胞递送。
此新型mCAR的工程化是基于安全开关的整合,以便1)CAR结合位点被掩蔽肽阻断,造成CAR-T细胞在体循环或正常组织环境中的静息;但2)当这些CAR-T细胞被运送到肿瘤中时掩蔽肽被在肿瘤环境中局部有活性的蛋白酶切割,由此使得活化的CAR-T细胞能在肿瘤位点处识别靶抗原。
mCAR与重组EGFR的削弱结合
为了测试各种设计的CAR的功能表达,用抗CD3/CD28抗体刺激人外周血单核细胞(PBMC),然后用编码未掩蔽、掩蔽或NSUB形式的抗EGFR CAR的逆转录病毒载体进行转导。使用蛋白L染色方案检测CAR表达(Zheng,ZL等人(2012).Protein L:a novel reagent forthe detection of Chimeric Antigen Receptors(CAR)expression by flowcytometry.Journal of Translational Medicine 10:29)并且在转导后8天通过流式细胞术来分析。对于所有三种形式的EGFR CAR检测到类似水平的CAR的表面表达(大约30~35%CAR阳性T细胞,图2a),并且观察到它们在T细胞培养条件下类似地扩增。
为了评估不同CAR构建体对其靶抗原EGFR的结合能力,将CAR-T细胞与同Fc融合的重组人EGFR(表示为rhEGFR-Fc)一起孵育,接着用抗人IgG Fc抗体染色。约35%未掩蔽的CAR-T细胞显示结合至EGFR,其很好地对应于由蛋白L检测的CAR阳性细胞的百分比,而掩蔽的和NSUB CAR-T细胞显示与靶抗原的结合显著减少,以致于仅分别检测到3%和0.4%结合(图2b)。因此,掩蔽肽可有效地阻断EGFR CAR-T细胞的抗原识别能力。
通过蛋白质水解恢复mCAR抗原结合
为了探究蛋白酶敏感性接头是否可被切割以暴露结合位点并恢复CAR结合,在与rhEGFR一起孵育之前用各种浓度的uPA(一种在多种人类癌瘤中有活性的常见蛋白酶)处理CAR-T细胞(Ulisse,S等人(2009).The urokinase plasminogen activator system:atarget for anti-cancer therapy.Current Cancer Drug Targets 9:32-71)。如所预期,未掩蔽的或NSUB CAR的结合能力在存在或不存在uPA处理的情况下没有明显不同(图3,上图和下图)。然而,掩蔽的CAR与EGFR的结合通过在uPA处理之后蛋白酶敏感性接头的蛋白水解切割而大大地恢复。发现掩蔽的CAR-T细胞的这种蛋白酶介导的结合活化是剂量依赖性的;可结合至rhEGFR的掩蔽的CAR-T细胞的百分比从无uPA处理时的6%增至分别用100nM和400nM蛋白酶时的23%和29%(图3,中图)。
掩蔽的CAR-T细胞的活性在蛋白酶不存在下被阻断,但一旦在体外用分泌蛋白酶的肿瘤细胞刺激便活化
考虑到掩蔽肽减弱掩蔽的和NSUB CAR与EGFR的结合,猜测掩蔽肽还可防止CAR-T细胞在蛋白酶不存在下对于EGFR+细胞的活化。为了检验这一猜测,产生一种靶细胞系K562-EGFR以稳定地过度表达人野生型EGFR。亲代K562细胞系是没有EGFR表达(Ghosh,G等人(2010).Quantifying the sensitivities of EGF receptor(EGFR)tyrosine kinaseinhibitors in drug resistant non-small cell lung cancer (NSCLC)cells usinghydrogel-based peptide array.Biosens Bioelectron26:424-431)但有极低水平的uPA表达(Antonyak,H等人(2001).Regulation of expression of the components ofplasminogen activation system in the leukemic cells.Exp Oncol 23:253-259)的人慢性骨髓性白血病细胞系。还使用两个先前研究的癌细胞系,即乳腺癌细胞系MDA-MB-231和肺癌细胞系NCI-H292,两者均具有野生型EGFR的高表面表达(Subik,K等人(2010).Theexpression patterns of ER,PR,HER2,CK5/6,EGFR,Ki-67and AR byimmunohistochemical analysis in breast cancer cell lines.Breast Cancer(Auckl)4:35-41;Raben,D等人(2005).The effects of cetuximab alone and in combinationwith radiation and/or chemotherapy in lung cancer.Clin Cancer Res 11:795-805)及肿瘤相关蛋白酶如uPA和蛋白裂解酶的高内源性分泌(Xing,RH和Rabbani,SA(1999).Transcriptional regulation of urokinase(uPA)gene expression in breast cancercells:role of DNA methylation.Int J Cancer81:443-450;Ma,Z等人(2001)Endogenously produced urokinase-type plasminogen activator is a majordeterminant of the basal level of activated ERK/MAP kinase and preventsapoptosis in MDA-MB-231breast cancer cells.J Cell Sci 114:3387-3396;Liu,G等人(1995).Co-expression of urokinase,urokinase receptor and PAI-1is necessaryfor optimum invasiveness of cultured lung cancer cells.Int J Cancer60:501-506)。为了检验掩蔽的CAR-T细胞的抗原特异性活化是否可在蛋白酶活性环境中实现,将EGFR CAR-T细胞与K562、K562-EGFR、MDA-MB-231或NCI-H292细胞共培养。CAR-T细胞的活化是经由细胞内细胞因子染色通过其产生促炎性细胞因子干扰素γ(IFN-γ)的能力来测量的(图4a,b)。
在K562细胞刺激的不存在下或在K562细胞的刺激下,所有CAR-T细胞组都呈现IFN-γ分泌的本底水平。在抗CD3/CD28抗体刺激后,它们全部都呈现与CD8+CAR-T细胞(约20%)相同的IFN-γ分泌水平。如所预期,未掩蔽的CAR-T细胞当与不同的靶细胞系共培养时在类似的百分比范围下作出应答(对于K562-EGFR、MDA-MB-231、NCI-H292分别为15.4%、17.8%、19.3%)。相反,所有测试组的NSUB CAR-T细胞与未掩蔽的CAR-T细胞相比显示出受损的细胞因子应答(对于K562-EGFR、MDA-MB-231、NCI-H292分别为1%、5%、6%)。此外,在掩蔽的EGFR CAR-T细胞中,仅约0.9%的CD8+细胞能够应答于K562-EGFR细胞的刺激而分泌IFN-γ,这与NSUB CAR-T组相比没有显著不同。因此,这一发现与先前的结合数据一致,由此证实CAR-T细胞的活化被掩蔽组和NSUB组的掩蔽肽大大地消除。然而,在表达EGFR并产生肿瘤相关蛋白酶的MDA-MB-231或NCI-H292肿瘤细胞刺激后,掩蔽的CAR-T细胞的活化水平(分别为16%和17.2%CD8+IFN-γ+)在很大程度上恢复到类似于未掩蔽组的水平。综上所述,这些数据表明EGFR特异性CAR-T细胞功能可在蛋白酶活化环境中选择性地活化,但在蛋白酶无效的环境中显著地消除。
还进行特异性细胞裂解测定以测试所有CAR-T细胞组对以上靶细胞系的细胞毒性作用。类似于IFN-γ测定,未掩蔽的CAR-T细胞裂解所有靶细胞,包括K562-EGFR、NCI-H292和MDA-MB-231;而掩蔽的CAR-T细胞在高效应细胞与靶细胞的比率下仅裂解H292和MDA-MB-231细胞并显示对K562-EGFR细胞无杀灭活性(图5a-c)。
掩蔽的CAR-T细胞显示在体内等同于未掩蔽的细胞的抗肿瘤功效
在证实了掩蔽的CAR-T细胞在体外应答于肿瘤细胞的特异性和功能性后,接着设法研究其在体内的抗肿瘤反应性。为了评价各种CAR-T细胞的抗肿瘤功效,利用NSG小鼠的皮下人肺癌异种移植物模型(图6a)。将NCI-H292细胞(6×106)注射到NSG小鼠的右侧腹中。当平均肿瘤尺寸在肿瘤接种之后第12天达到约120mm3时,将所有携带肿瘤的小鼠随机化到肿瘤尺寸等级匹配的组群(每治疗组n=8)中,并且开始CAR-T处理。在第13天和第26天将小鼠用4百万个CAR-T细胞经由静脉内注射处理,并且监测肿瘤生长。在所有治疗组中的动物都显示肿瘤进展。与未转导的对照T细胞组相比,NSUBCAR-T细胞的输注对减慢肿瘤生长没有影响(图6b)。然而,与接受未转导的T细胞的小鼠相比,接受未掩蔽或掩蔽的CAR-T细胞的那些小鼠产生肿瘤生长抑制(未掩蔽的:P=0.0294,掩蔽的:P=0.0404,单向ANOVA)。因此,未掩蔽和掩蔽的CAR-T细胞都显著地延长小鼠的存活期(图6c,未掩蔽的:P=0.0006,掩蔽的:P=0.0036,对数秩检验)。未掩蔽组和掩蔽组与具有42天的中值存活期的未转导组和NSUB组相比在首次处理之后分别具有50.5天和49天的中值存活期(图6c)。
“中靶脱肿瘤”毒性为CAR-T疗法在实体肿瘤中的转化应用的严重限制。这通常归因于靶抗原在正常组织中的低表达水平。由于CAR-T细胞对靶抗原的高敏感性,所以中靶毒性对于基于CAR的细胞疗法来说与常规抗体疗法相比可尤其严重。因此,在各种肿瘤中过度表达但在其它组织中广泛表达的靶抗原如EGFR和HER2一般被认为是CAR-T细胞的“不可药用的(undruggable)”靶标。
在此,证实了此限制可通过经由引入可切割的掩蔽肽将CAR分子再工程化为mCAR以阻断scFv结构域中的抗原识别位点来克服。类似于亲代未掩蔽的抗EGFR CAR-T细胞,发现掩蔽的抗EGFRCAR-T细胞显示出类似的细胞因子产生和针对过度表达EGFR的乳腺癌细胞系MDA-MB-231和肺癌细胞系NCI-H292的细胞杀灭活性。重要的是,掩蔽的CAR-T细胞显著地降低对于过度表达EGFR且几乎不分泌或不分泌蛋白酶的细胞的反应性。在NSG小鼠中建立的人肺癌异种移植物模型中,掩蔽的CAR-T细胞显示出与亲代CAR-T细胞在体内抑制肿瘤生长方面同样有效。
已做出了一些尝试以探究提高CAR工程化的T细胞的肿瘤组织选择性的工程化设计(Klebanoff,CA等人(2016).Prospects for gene-engineered T cell immunotherapyfor solid cancers.Nat Med22:26-36)。一种精巧的策略利用两个CAR的双重靶向以获得肿瘤而非正常细胞的选择性识别。据证实表达靶向两种不同抗原的两个CAR的T细胞可用作控制充分T细胞活化的逻辑门(logic gate)。在一个实例中,设计两个削弱的CAR以便由一个CAR对一种抗原靶标的识别仅诱导次优的T细胞活化,而由第二抗原对第二CAR的活化可提供另外的共刺激信号。因此,两个CAR的活化以所有潜力同时产生T细胞以诱导针对表达两种抗原的肿瘤组织的抗肿瘤免疫应答(Kloss,CC等人(2013).Combinatorial antigenrecognition with balanced signaling promotes selective tumor eradication byengineered T cells.Nat Biotechnol 31:71-75。或者,相同的组将两个功能上不同的CAR,即一个抑制性CAR(iCAR)和另一个活性CAR(aCAR)引入相同的T细胞中。当这种双重CAR-T细胞遇到表达两种抗原的正常组织环境时,由iCAR触发的抑制性信号支配T细胞信号传导并且预先限制T细胞应答。然而,当CAR-T细胞运送到仅有aCAR而无iCAR抗原可用的肿瘤环境中时,CAR-T细胞可被充分活化以引发抗肿瘤免疫。35本mCAR方法提供又一种策略以生成有条件活性的CAR以用于提高CAR-T细胞的肿瘤特异性。
另一种降低中靶脱肿瘤毒性的方法涉及调整CAR分子的亲和力以便更好地区分肿瘤组织中的抗原靶标与正常组织中的抗原。近期的研究显示来源于低亲和力抗EGFR或抗HER2scFv的CAR可选择性地靶向肿瘤细胞,而留下具有低靶抗原表达的正常组织(Liu,X等人(2015).Affinity-tuned ErbB2or EGFR chimeric antigen receptor T cellsexhibit an increased therapeutic index against tumors in mice.Cancer Res75:3596-3607;Caruso等人(2015).Tuning sensitivity of CAR to EGFR density limitsrecognition of normal tissue while maintaining potent antitumoractivity.Cancer Res 75:3505-3518;Chmielewski,M等人(2004).T cell activation byantibody-like immunoreceptors:increase in affinity of the single-chainfragment domain above threshold does not increase T cell activation againstantigen-positive target cells but decreases selectivity.J Immunol 173:7647-7653)。此方法可应用于设计有效和安全的CAR,但仍因不能识别具有相对较低肿瘤抗原密度的肿瘤细胞群而具有潜在缺点。因此,对于具有不均匀的抗原表达水平的肿瘤,这些CAR工程化的细胞可排除高抗原表达的肿瘤细胞,但可能错过具有低抗原表达的肿瘤。不同于亲和力调整设计,mCAR可来源于目前可用的高亲和力抗体并且mCAR的选择性是归因于空间上受控的受体活化。仅在蛋白酶富集的肿瘤微环境中,掩蔽的CAR-T细胞才变得应答于周围环境中的靶标并且触发下游细胞毒性应答。
总而言之,本研究已提供关于进一步调查和开发掩蔽的CAR平台的起点。然而,虽然在体外在有或没有肿瘤相关蛋白酶的靶细胞之间观察到提高的选择性且在动物研究中观察到抗肿瘤反应性,但mCAR构建体在人类中的安全性和功效还需要在涉及非人灵长类动物的临床前试验或I期先导试验中进一步评价和检验。我们的CAR来源于西妥昔单抗,西妥昔单抗与小鼠EGFR有最少的交叉反应性,且因此难以在小鼠模型中评价掩蔽的抗EGFRCAR-T细胞对正常组织的反应性。此外,在此项研究中,CAR-T作为单一试剂施用,其通常仅具有差强人意的抗肿瘤功效,尤其是在实体肿瘤中。在临床背景中,包括CAR-T疗法和化疗或免疫检查点抑制剂的组合疗法可用于增强治疗功效。另外,之前已经测试20,用于mCAR设计中的蛋白酶可切割的接头对在肿瘤微环境中有局部活性的多种蛋白酶而非正常组织中的蛋白酶如组织纤溶酶原活化物(tPA)、纤溶酶和KLK5敏感。然而,在人类中的临床研究之前即需要甚至更宽范围的正常蛋白酶的评价。
由于EGFR在许多种类的人癌瘤中失调,所以此项研究提供一种关于设计能够靶向不同类型癌症的CAR的途径。此掩蔽的CAR策略可有助于扩大CAR-T细胞对缺乏另外“可药用的”肿瘤抗原的癌症的适用性。其还可能使CAR-T疗法靶向肿瘤抗原,如碳酸酐酶IX或HER2,其中显示“中靶脱肿瘤”副作用是无法忍受并危且生命的(Morgan,RA等人(2010).Casereport of a serious adverse event following the administration of T cellstransduced with a chimeric antigen receptors recognizing ERBB2.Mol Ther 18:843-851;Lamers,CH等人(2013).Treatment of metastatic renal cell carcinoma withCAIX CAR-engineered T cells:clinical evaluation and management of on-targettoxicity.Mol Ther 21:904-912)。
上述各种方法和技术提供了实施本申请的多种方式。当然,应当理解未必所有所述的目标或优点都可根据本文所述的任何具体实施方案实现。因此,例如,本领域技术人员将认识到,所述方法可以能够实现或优化本文所教导的一个优点或一组优点的方式进行,而不必实现本文所教导或提出的其它目标或优点。在本文中提及多种替代。应理解的是,一些优选实施方案具体地包括一个、另一个或几个特征,而其它具体地排除一个、另一个或几个特征,而还有一些通过纳入一个、另一个或几个有利的特征而削弱具体的特征。
此外,熟练的技术人员将认识到来自不同实施方案的各种特征的适用性。类似地,以上论述的各种要素、特征及步骤以及各所述要素、特征或步骤的其它已知等效方案可由本领域普通技术人员以各种组合形式使用以便根据本文所述的原理执行这些方法。在各种要素、特征及步骤之中,在不同实施方案中将具体地包括一些且将具体地排除另一些。
虽然已在某些实施方案和实施例的上下文中公开了本申请,但本领域技术人员应理解,本申请的实施方案可延伸超出具体公开的实施方案至其它替代实施方案和/或用途及其修改和等效方案。
本文描述了本申请的优选实施方案,包括本发明人已知的用于实施本申请的最佳方式。本领域普通技术人员一旦阅读了以上说明将显而易见针对那些优选实施方案的变型。预期熟练的技术人员可视情况采用这种变型且可通过不同于本文具体描述的方式来实施本申请。相应地,只要适用法律容许,本申请的许多实施方案包括在所附权利要求书中所述主题的所有修改和等效方案。此外,除非本文另外指出或与上下文明显矛盾,本申请包括上述要素以其所有可能变型的任何组合。
本文引用的所有专利、专利申请、专利申请公布及其它材料,如文章、书籍、说明书、出版物、文献、内容等出于所有目的据此以引用的方式整体并入本文,以下除外:与此有关的任何起诉文件历史、与本文献不一致或矛盾的任一者、或可对与本文献现在或以后有关的权利要求的最宽范围具有限制影响的任一者。举例来说,如果在同任何所并入的材料有关与同本文献有关之间的术语的说明、定义和/或使用中的任何不一致性或冲突的话,应以本文献中术语的说明、定义和/或使用为准。
应理解,本文所公开的申请的实施方案为本申请的实施方案的原理的例示。可采用在本申请范围内的其它修改。因此,举例来说而非限制,可根据本文的教导利用本申请的实施方案的替代配置。因此,本申请的实施方案不限于确切所示和所述的。
本发明的各种实施方案如上在详述中描述。虽然这些说明直接描述了以上实施方案,但应当理解,本领域技术人员可以想到针对本文示出和描述的具体实施方案的修改和/或变型。落入本描述范围内的任何这种修改或变型也被认为包括在其中。除非特别指出,本发明人的意图是,说明书和权利要求中的词汇或短语被赋予本应用领域的普通技术人员常用的且惯用的含义。
已经给出了本申请人在提交申请时所了解的本发明的各种实施方案的上述描述,并且这些描述旨在用于示例和说明的目的。本描述并非是穷举性的,也并非要将本发明限制于所公开的确切形式,且根据上述教导可能存在许多修改和变型。所述实施方案用来解释本发明的原理及其实际应用,从而使得本领域的其他技术人员能够以适于预期具体用途的各种实施方案和各种修改利用本发明。因此,这意味着本发明不限于为实践本发明而公开的具体实施方案。
虽然已经示出并描述了本发明的具体实施方案,但对本领域技术人员显而易见的是,基于本文的教导,可在不背离本发明及其更宽方面的情况下做出改变和修改,且因此,所附权利要求应包括在其范围内,所有这些改变和修改都在本发明真正的精神和范围内。
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<110> UNIVERSITY OF SOUTHERN CALIFORNIA
WANG, Pin
HAN, Xiaolu
BRYSON, Paul
<120> 用于肿瘤特异性活化的掩蔽嵌合抗原受体T细胞
<130> 065715-000066WO00
<150> 62/185,398
<151> 2015-06-26
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<211> 556
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<213> 人工序列
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Arg Ala Ser Gln Ser Ile Gly Thr Asn Ile His Trp Tyr Gln Gln Arg
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Gly Gly Gly Ser Gln Val Gln Leu Lys Gln Ser Gly Pro Gly Leu Val
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Gln Pro Ser Gln Ser Leu Ser Ile Thr Cys Thr Val Ser Gly Phe Ser
180 185 190
Leu Thr Asn Tyr Gly Val His Trp Val Arg Gln Ser Pro Gly Lys Gly
195 200 205
Leu Glu Trp Leu Gly Val Ile Trp Ser Gly Gly Asn Thr Asp Tyr Asn
210 215 220
Thr Pro Phe Thr Ser Arg Leu Ser Ile Asn Lys Asp Asn Ser Lys Ser
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Trp Gly Gln Gly Thr Leu Val Thr Val Ser Ser Thr Thr Thr Pro Ala
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Arg Gly Leu Asp Phe Ala Cys Asp Ile Phe Trp Val Leu Val Val Val
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Ile Phe Trp Val Arg Ser Lys Arg Ser Arg Gly Gly His Ser Asp Tyr
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Met Asn Met Thr Pro Arg Arg Pro Gly Pro Thr Arg Lys His Tyr Gln
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Claims (38)
1.一种掩蔽的嵌合抗原受体(mCAR),其包含:
a.掩蔽肽;
b.抗原特异性靶向结构域;
c.跨膜结构域;
d.至少一个共刺激结构域;以及
e.细胞内信号传导结构域,
其中所述抗原特异性靶向结构域包含抗原特异性单链Fv(scFv)片段。
2.如权利要求1所述的mCAR,其还包含细胞外间隔区结构域。
3.如权利要求1所述的mCAR,其中所述掩蔽肽包含特异性地结合所述抗原特异性靶向结构域的掩蔽物和切割位点。
4.如权利要求3所述的mCAR,其中所述掩蔽物和所述切割位点通过接头连接。
5.如权利要求1所述的mCAR,其中所述掩蔽肽通过接头连接到所述cAR。
6.如权利要求1所述的mCAR,其中所述mCAR当被掩蔽时无活性且当所述掩蔽物被切割时则有活性。
7.如权利要求3所述的mCAR,其中所述切割位点为蛋白酶特异性切割位点。
8.如权利要求5所述的mCAR,其中呈未切割状态的掩蔽的mCAR包含如下从N-末端至C-末端的结构排列:掩蔽物-接头-切割位点-抗原特异性靶向结构域-跨膜结构域-共刺激结构域-细胞内信号传导结构域。
9.如权利要求5所述的mCAR,其中呈未切割状态的掩蔽的mCAR包含如下从N-末端至C-末端的结构排列:掩蔽物-接头-切割位点-抗原特异性靶向结构域-细胞外间隔区结构域-跨膜结构域-共刺激结构域-细胞内信号传导结构域
10.如权利要求2所述的掩蔽的嵌合抗原受体,其中所述细胞外间隔区结构域包含以下任何一个或多个:抗体的Fc片段或其功能等效物、片段或衍生物;抗体的铰链区或其功能等效物、片段或衍生物;抗体的CH2区;抗体的CH3区;人工间隔区序列及其组合。
11.如权利要求10所述的掩蔽的嵌合抗原受体,其中所述细胞外间隔区结构域包含以下任何一个或多个:(i)IgG4的铰链区、CH2区及CH3区,(ii)IgG4的铰链区,(iii)IgG4的铰链区和CH2区,(iv)CD8α的铰链区,(v)IgG1的铰链区、CH2区及CH3区,(vi)IgG1的铰链区,(vi)IgG1的铰链区和CH2区,或(vii)其组合。
12.如权利要求1所述的掩蔽的嵌合抗原受体,其中所述跨膜结构域包含以下任何一个或多个:I型跨膜蛋白的跨膜区、人工疏水序列及其组合。
13.如权利要求12所述的掩蔽的嵌合抗原受体,其中所述跨膜结构域包含以下任何一个或多个:T细胞受体复合物的ξ链的跨膜结构域、CD28、CD8α及其组合。
14.如权利要求1所述的掩蔽的嵌合抗原受体,其中所述共刺激结构域包含来自以下任何一个或多个的信号传导结构域:CD28、CD137(4-1BB)、CD134(OX40)、Dap10、CD27、CD2、CD5、ICAM-1、LFA-1、Lck、TNFR-I、TNFR-II、Fas、CD30、CD40及其组合。
15.如权利要求1所述的掩蔽的嵌合抗原受体,其中所述细胞内信号传导结构域包含以下一个或多个的信号传导结构域:人CD3ξ链、FcγRIII、FcεRI、Fc受体的细胞质尾、携带细胞质受体的基于免疫受体酪氨酸的活化基序(ITAM)及其组合。
16.如权利要求1所述的掩蔽的嵌合抗原受体,其中所述抗原特异性靶向结构域靶向选自由以下组成的组的抗原:对癌症、炎性疾病、神经元病症、糖尿病、心血管疾病、感染性疾病、自身免疫疾病及其组合有特异性的抗原。
17.如权利要求16所述的掩蔽的嵌合抗原受体,其中对癌症有特异性的所述抗原包括以下任一种或多种:4-1BB、5T4、腺癌抗原、α-甲胎蛋白、BAFF、B-淋巴瘤细胞、C242抗原、CA-125、碳酸酐酶9(CA-IX)、C-MET、CCR4、CD152、CD19、CD20、CD200、CD22、CD221、CD23(IgE受体)、CD28、CD30(TNFRSF8)、CD33、CD4、CD40、CD44v6、CD51、CD52、CD56、CD74、CD80、CEA、CNTO888、CTLA-4、DR5、EGFR、EpCAM、CD3、FAP、纤连蛋白额外结构域-B、叶酸受体1、GD2、GD3神经节苷脂、糖蛋白75、GPNMB、HER2/neu、HGF、人分散因子受体激酶、IGF-1受体、IGF-I、IgG1、L1-CAM、IL-13、IL-6、胰岛素样生长因子I受体、整联蛋白α5β1、整联蛋白αvβ3、MORAb-009、MS4A1、MUC1、粘蛋白CanAg、N-乙醇酰神经氨酸、NPC-1C、PDGF-R α、PDL192、磷脂酰丝氨酸、前列腺癌细胞、RANKL、RON、ROR1、SCH 900105、SDC1、SLAMF7、TAG-72、腱生蛋白C、TGFβ2、TGF-β、TRAIL-R1、TRAIL-R2、肿瘤抗原CTAA16.88、VEGF-A、VEGFR-1、VEGFR2、波形蛋白及其组合。
18.如权利要求16所述的掩蔽的嵌合抗原受体,其中对炎性疾病有特异性的所述抗原包括以下任一种或多种:AOC3(VAP-1)、CAM-3001、CCL11(嗜酸性细胞活化趋化因子-1)、CD125、CD147(基础免疫球蛋白)、CD154(CD40L)、CD2、CD20、CD23(IgE受体)、CD25(IL-2受体的α链)、CD3、CD4、CD5、IFN-α、IFN-γ、IgE、IgEFc区、IL-1、IL-12、IL-23、IL-13、IL-17、IL-17A、IL-22、IL-4、IL-5、IL-5、IL-6、IL-6受体、整联蛋白α4、整联蛋白α4β7、大羊驼、LFA-1(CD11a)、MEDI-528、肌生长抑制素、OX-40、rhuMAbβ7、硬化蛋白、SOST、TGFβ1、TNF-α、VEGF-A及其组合。
19.如权利要求16所述的掩蔽的嵌合抗原受体,其中对神经元病症有特异性的所述抗原包括以下任一种或多种:β淀粉样蛋白、MABT5102A及其组合。
20.如权利要求16所述的掩蔽的嵌合抗原受体,其中对糖尿病有特异性的所述抗原包括以下任一种或多种:L-1β、CD3及其组合。
21.如权利要求16所述的掩蔽的嵌合抗原受体,其中对心血管疾病有特异性的所述抗原包括以下任一种或多种:C5、心肌肌球蛋白、CD41(整联蛋白α-IIb)、纤维蛋白II、β链、ITGB2(CD18)、鞘氨醇-1-磷酸及其组合。
22.如权利要求16所述的掩蔽的嵌合抗原受体,其中对感染性疾病有特异性的所述抗原包括以下任一种或多种:炭疽毒素、CCR5、CD4、聚集因子A、巨细胞病毒、巨细胞病毒糖蛋白B、内毒素、大肠杆菌、乙型肝炎表面抗原、乙型肝炎病毒、HIV-1、Hsp90、甲型流感血球凝集素、脂磷壁酸、绿脓假单胞菌、狂犬病病毒糖蛋白、呼吸道合胞病毒、TNF-α及其组合。
23.如权利要求1所述的mCAR,其中所述抗原特异性靶向结构域靶向EGFR。
24.如权利要求1所述的mCAR,其中所述mCAR包含表1和/或SEQ ID NO:29中列出的序列。
25.一种多核苷酸,其编码如权利要求1所述的掩蔽的嵌合抗原受体。
26.一种多肽,其由如权利要求25所述的多核苷酸编码。
27.一种载体,其包含如权利要求25所述的多核苷酸。
28.一种病毒,其包含如权利要求25所述的多核苷酸。
29.如权利要求28所述的病毒,其中所述病毒为RNA病毒。
30.如权利要求28所述的病毒,其中所述病毒为逆转录病毒、腺病毒、腺相关病毒、慢病毒、痘病毒或疱疹病毒。
31.一种基因工程化的细胞,其包含如权利要求25所述的多核苷酸序列。
32.如权利要求31所述的基因工程化的细胞,其中所述细胞为T细胞。
33.如权利要求32所述的基因工程化的细胞,其中所述细胞为天然T细胞、中心记忆T细胞、效应记忆T细胞或其组合。
34.如权利要求31所述的基因工程化的细胞,其中所述细胞为天然杀伤细胞、造血干细胞、胚胎干细胞或多能干细胞。
35.一种用于产生大量表达掩蔽的嵌合抗原受体的T细胞的方法,所述方法包括:
用如权利要求27所述的载体转染一个或多个T细胞;及
用表达由抗原特异性靶向结构域靶向的抗原的细胞或用对mCAR的ASTD有特异性的重组抗原刺激所述一个或多个T细胞,借此所述T细胞增殖以产生大量T细胞。
36.一种用于治疗有此需要的受试者的疾病的方法,所述方法包括:
提供如权利要求1所述的组合物;及
向所述受试者施用治疗有效量的所述组合物,以便治疗所述疾病,其中所述抗原特异性靶向结构域与所述疾病有关。
37.如权利要求36所述的方法,其中所述疾病为癌症。
38.如权利要求36或37所述的方法,其中所述癌症为肺癌、乳腺癌、肾癌或神经母细胞瘤。
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PCT/US2016/039670 WO2016210447A1 (en) | 2015-06-26 | 2016-06-27 | Masking chimeric antigen receptor t cells for tumor-specific activation |
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Also Published As
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US10822419B2 (en) | 2020-11-03 |
CA2986604A1 (en) | 2016-12-29 |
EP3313874A4 (en) | 2018-12-05 |
WO2016210447A1 (en) | 2016-12-29 |
EP3313874A1 (en) | 2018-05-02 |
DK3313874T3 (da) | 2021-05-03 |
US20180148508A1 (en) | 2018-05-31 |
JP2018518972A (ja) | 2018-07-19 |
EP3313874B1 (en) | 2021-03-10 |
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