CN116059393A - 包含修饰铰链区的IgG4 FC片段 - Google Patents
包含修饰铰链区的IgG4 FC片段 Download PDFInfo
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- CN116059393A CN116059393A CN202211237140.1A CN202211237140A CN116059393A CN 116059393 A CN116059393 A CN 116059393A CN 202211237140 A CN202211237140 A CN 202211237140A CN 116059393 A CN116059393 A CN 116059393A
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Abstract
本发明涉及包含修饰铰链区的IgG4FC片段。本发明涉及可用作药物载体的修饰IgG4Fc片段。当本发明的修饰IgG4Fc片段与任意药物结合时,所得的药物缀合物可以使IgG4Fc的效应子功能以及与体内IgG的链交换最小化,同时保持药物缀合物的体内活性并提高其体内持续时间。
Description
本申请是分案申请,原申请的申请日为2014年5月29日,申请号为201480031130.X,发明名称为“包含修饰铰链区的IgG4 FC片段”。
[技术领域]
本发明涉及可用作药物载体的IgG4 Fc片段,更具体地涉及可以最小化Fc的效应子功能(effector functions),但不引起与体内IgG进行链交换,并且可以提高缀合药物的体内半衰期的IgG4 Fc片段。
[背景技术]
遗传工程技术的进步已经造就各种蛋白质药物的制造和使用。但是,蛋白质药物的致命问题在于,其因体内蛋白酶而容易变性或容易分解,因此无法长时间维持其体内浓度和滴定度。因此,为了给患者提供有效治疗同时减少患者接受通过注射等进行的频繁蛋白质供应的负担和其费用,通过增加蛋白质稳定性使蛋白质药物的血液和体内浓度维持在适当水平是非常重要的。
因此,为提高蛋白质药物的体内稳定性,长久以来已做过很多尝试——通过改变蛋白质的制剂类型、与其它蛋白质融合、或通过化学或生物学方法将合适的聚合物附着于蛋白质表面上。
其中一种通过与其它蛋白质融合来提高蛋白质稳定性的尝试是进行免疫球蛋白Fc和蛋白质之间的融合。
Fc区,除抗原结合能力(免疫球蛋白的主要功能)之外,还负责效应子功能,如补体依赖性细胞毒性(CDC)和抗体依赖性细胞毒性(ADCC)。此外,存在于Fc区的FcRn序列具有通过缀合至体内FcRn受体来增加体内半衰期而调节血清中的IgG水平的作用。关于这点,已经通过Fc区与治疗性蛋白质之间的融合进行了积极的研究来改良治疗性蛋白质。
但是,通过遗传重组产生的Fc融合蛋白的缺点在于:蛋白质融合仅在Fc区的特定区域可能发生,即氨基末端或羧基末端,且仅在糖基化蛋白质之间或非糖基化蛋白质之间可能发生,但在糖基化蛋白质和非糖基化蛋白质之间不可能发生。此外,通过遗传重组产生的Fc融合蛋白的问题在于:由于通过融合新产生的氨基酸序列可导致免疫应答发生,以及蛋白酶对连接体区域的敏感性可能增加。
此外,Fc融合蛋白具有增强的靶蛋白血清半衰期,但同时其也存在问题:Fc区具有的效应子功能显现(美国专利号5,349,053)。通过Fc区的效应子功能,融合蛋白可以固着补体或结合至FcRs表达细胞以破坏特定细胞,和诱导引发炎症的多种细胞因子生成和分泌,从而引发炎症。另外,融合区域中的蛋白质序列是在人体中不存在的新蛋白质序列,因此其具有多种缺点,包括在长期施用的情况下可能诱导免疫应答。
因此,研究已致力于采用其中效应物功能被删除同时血清半衰期得到保持的免疫球蛋白或免疫球蛋白片段。Cole等先前报道,通过用丙氨酸取代CH2结构域中的第234、235和237位残基(已知其在结合Fc受体方面具有重要作用)来抑制ADCC活性,以生产Fc受体亲和力降低的Fc衍生物,(Cole等,J.Immunol.159:3613-3621,1997)。但是,所有的这些都具有不适合的、与天然人Fc区不同的氨基酸,因此可具有更高的免疫性或抗原性,并且优选的Fc功能可能丧失。
作为在保持高血浓度免疫球蛋白的同时去除或减少不需要的效应子功能的方法,一种去除免疫球蛋白中的糖类的方法得到研究。在美国专利号5,585,097中,通过在制备CD3抗体时使CH2结构域的第297位天冬酰胺残基(CD3抗体的糖基化残基)被另一氨基酸取代,制备了非糖基化的抗体衍生物,并且具体地,该衍生物显示出降低的效应子功能,同时保持与FcRn受体的结合力,并且不改变其血清半衰期。但是,该方法也存在问题,由于新的重组构建体生成,其可能被免疫系统识别为外来物质并因此被免疫系统排斥。
在利用天然IgG Fc的序列制备融合蛋白质时,可选择IgG4 Fc,以最小化Fc的效应子功能。已知IgG4具有与IgG1相似的体内半衰期,但由于氨基酸序列差异而具有相对小的效应子功能。然而,尽管IgG4具有效应子功能降低的优势,但由于其独特的铰链序列,IgG4之间可发生体内链交换,因此据报道,将融合蛋白质用于治疗目的时存在很大困难(vander Neut Kolfschoten等,Science,317:1554-1557,2007)。也就是说,存在如下问题:当IgG4 Fc被用作蛋白质融合的载体时,与体内存在的IgG4发生链交换,从而与天然IgG4形成杂合体,或者其可以单体形式存在,从而改变原始结构并具有低治疗活性的结构。通过遗传工程或在体外是否生成IgG4 Fc片段和生理活性物质之间的融合产物是一个普遍问题。
[发明内容]
[技术问题]
在这种情况下,基于研发能够充当药物载体的、诱导与体内IgG的Fab臂交换反应(exchange反应)和效应子功能的风险低、同时能够克服遗传重组融合技术的缺点的IgG Fc片段的研究,发明人发现,当在大肠杆菌(E.coli)中生成经突变仅具有一个半胱氨酸残基的IgG4 Fc片段铰链序列并使之与药物缀合时,可形成具有耐久性提高而无诱导与体内IgG的Fab臂交换反应和效应子功能的风险的药物缀合物,从而完成本发明。
[技术方案]
本发明的一个目的是提供IgG4 Fc片段,其诱导与体内IgG的链交换反应或效应子功能的风险低,并且可以充当药物载体。更具体地,本发明的一个目的是提供修饰的IgG4Fc片段,其包含修饰的铰链区,其中部分铰链序列被删除,而仅包括一个半胱氨酸残基。.
本发明的另一目的是提供核酸,其编码包含修饰铰链区的修饰IgG4 Fc片段,其中部分铰链序列被删除,从而仅包括一个半胱氨酸残基。
本发明的又一目的是提供载体,其包含编码包含修饰铰链区的修饰IgG4 Fc片段的核酸,其中部分铰链序列被删除,从而仅包括一个半胱氨酸残基。
本发明的又一目的是提供微生物,该微生物其中引入包括编码包含修饰铰链区的修饰IgG4 Fc片段的核酸的载体,其中部分铰链序列被删除,从而仅包括一个半胱氨酸残基。
本发明的又一目的是提供制备修饰IgG4 Fc片段的方法,包括培养引入了载体的微生物,所述载体包括编码修饰IgG4 Fc片段的核酸。
本发明的又一目的是提供药物缀合物,其中药物和修饰IgG4 Fc片段通过连接体缀合。
本发明的又一目的是提供包含药物缀合物的药物组合物,其中药物和修饰IgG4Fc片段通过连接体缀合。
[发明的有利效果]
本发明可提供修饰的IgG4 Fc片段,其在没有氨基酸取代或添加或聚糖添加的情况下具有最小化的效应子功能,并且与体内IgG4无链交换反应。本发明的修饰IgG4 Fc片段与其缀合至药物的方法(如遗传工程法和体外共价法)无关,在其缀合至药物时,可抑制缀合药物的体内链交换反应,因此与天然IgG4 Fc片段相比,可以提供显著的治疗优越性。
[附图说明]
图1显示大鼠血液中是否存在生物素化hIgG4和人粒细胞集落刺激因子-PEG-IgG4Fc片段之间的人IgG4链交换。
图2显示人血液中是否存在生物素化hIgG4和人粒细胞集落刺激因子-PEG-IgG4Fc片段之间的人IgG4链交换。
[具体实施方式]
下面将参考附图对本发明的优选实施方式进行更加详细的描述。但是,本发明可以不同形式实施,不应被解释为限制于本文所示的实施方式。相反,这些实施方式被提供,使得本公开是透彻而完整的,并且向本领域技术人员充分传达本发明的范围。
在实现上述目的的方面,本发明提供可用作药物载体的修饰IgG4 Fc片段。更具体地,本发明提供包含修饰铰链区的修饰IgG4 Fc片段,其中部分铰链序列被删除,从而仅包括一个半胱氨酸残基。
本发明的修饰IgG4 Fc片段包括修饰铰链区,其中由下列氨基酸序列表示的铰链区部分被删除,从而仅包括一个半胱氨酸残基:
Glu-Ser-Lys-Tyr-Gly-Pro-Pro-Cys-Pro-Ser-Cys-Pro(SEQ ID NO:1).
在争取解决IgG4 Fc片段由于与体内IgG4的链交换反应而具有低效用的问题时,尽管其作为载体增加药物半衰期的效用,本发明人发现,当通过删除从IgG4 Fc片段的铰链区中存在的两个半胱氨酸残基中去除一个半胱氨酸残基以及部分铰链区来修饰IgG4 Fc片段时,不发生体内链交换反应和单体形成,从而确认修饰的IgG4 Fc片段可以有效地用作药物载体。
在实施方式中,本发明的IgG4 Fc片段可包括修饰的铰链区,所述修饰通过删除SEQ ID NO:1的氨基酸序列的包括第8位Cys残基的1至8个氨基酸进行。
另外,在实施方式中,本发明的IgG4 Fc片段可包括修饰的铰链区,所述修饰通过删除SEQ ID NO:1的氨基酸序列的包括第11位Cys残基的1至8个氨基酸进行。
可选地,在实施方式中,本发明的IgG4 Fc片段可包括修饰的铰链区,所述修饰通过删除SEQ ID NO:1的氨基酸序列的包括第8位Cys残基的1至5个氨基酸、或SEQ ID NO:1的氨基酸序列的包括第11位Cys残基的1至5个氨基酸进行。
可选地,在实施方式中,本发明的IgG4 Fc片段可包括修饰的铰链区,所述修饰通过删除SEQ ID NO:1的氨基酸序列的包括第8位半胱氨酸残基的1至3个氨基酸、或SEQ IDNO:1的氨基酸序列的包括第11位半胱氨酸残基的1至3个氨基酸进行。
以上删除的氨基酸残基可以是连续的或不连续的。
本发明的IgG4 Fc片段的铰链区的特征在于,其经修饰仅包括SEQ ID NO:1的氨基酸序列的第8位和第11位的两个半胱氨酸残基之间的一个半胱氨酸残基,以及两个半胱氨酸残基没都被去除。
经修饰仅包括铰链区内的两个半胱氨酸残基中的一个半胱氨酸残基的铰链区使修饰的IgG4 Fc片段在无体内链交换、单体形成等的情况下具有效果。
如本文所用,术语“载体”(carrier)是指缀合至药物以及正要缀合至药物的物质,其通常增加或去除药物的生理学活性。然而,本发明的载体增加药物的体内稳定性,同时使药物生理学活性的减少最小化,并且本发明的载体的特征在于,其不具有阻碍缀合该载体的药物的治疗活性(如细胞凋亡或补体激活)和结合具体蛋白的任何药理作用。
如本文所用,术语“IgG4 Fc片段”是指IgG4的重链恒定区2(CH2)和重链恒定区3(CH3),不包括其重链和轻链可变区、重链恒定区1(CH1)和轻链恒定区1(CL1),但包括该重链恒定区中的修饰铰链区。此外,本发明的IgG4 Fc片段可以指包括免疫球蛋白的部分或全部重链恒定区1(CH1)和/或轻链恒定区1(CL1)、不包括其重链和轻链可变区的延伸Fc区,只要IgG4 Fc片段具有与天然型相比基本上相同的作用或提高的作用。
此外,本发明的IgG4 Fc片段不仅包括其天然氨基酸序列,还包括其序列衍生物(突变蛋白)。如本文所用,术语“IgG4 Fc片段的突变蛋白”是指因其铰链区以外的区域中的天然氨基酸序列中的至少一个氨基酸残基被删除、插入、保守性取代、非保守性取代或其组合而具有不同于其天然型的氨基酸序列的IgG4 Fc片段。此外,去除了能够形成二硫键的区域、从天然Fc的N端去除了几个氨基酸,或者在天然Fc的N端添加了甲硫氨酸残基的各种衍生物可以是可能的。此外,可去除补体结合区域,例如C1q结合区域或ADCC区域,以消除效应子功能。制备Fc区的突变蛋白的方法被公开于国际专利公开WO 97/34631、WO 96/32478等。
不完全改变分子活性的蛋白质或肽的氨基酸交换此前已被公开(H.Neurath,R.L.Hill,The Protein,Academic Press,纽约,1979)。通常发生的交换是如下氨基酸残基之间的交换:Ala/Ser、Val/Ile、Asp/Glu、Thr/Ser、Ala/Gly、Ala/Thr、Ser/Asn、Ala/Val、Ser/Gly、Thy/Phe、Ala/Pro、Lys/Arg、Asp/Asn、Leu/Ile、Leu/Val、Ala/Glu和Asp/Gly。在某些情况下,修饰可以通过磷酸化、硫酸化、丙烯酸化、糖基化、甲基化、法呢基化、乙酰化、酰胺化进行。
同时,本发明的IgG4 Fc片段可以是源自人、牛、山羊、猪、小鼠、兔、仓鼠、大鼠、豚鼠等的IgG4 Fc片段,优选源自人。
本发明的IgG4 Fc片段可以是IgG4 Fc片段的重组型,其中人、牛、山羊、猪、小鼠、兔、仓鼠、大鼠、豚鼠等来源的Fc区是从微生物中得到的。
此外,IgG4 Fc片段可以是如下形式:天然聚糖形式、与天然聚糖相比数量增加的聚糖的形式、或无聚糖形式。免疫球蛋白中Fc聚糖的增加、减少或去除可以利用微生物利用本领域的常规方法进行,如化学法、酶法、的遗传工程方法等。具体地,由于从Fc中去除了聚糖的免疫球蛋白Fc区显示补体(c1q)结合能力显著退化并且抗体依赖型细胞毒性或补体依赖性细胞毒性降低或消除,因此不会在体内引起不必要的免疫应答。在这方面,更好地满足作为药物载体的最初目的的更合适类型的IgG4 Fc片段可以是非糖基化的IgG4 Fc片段。
如本文所用,术语“去糖基化”是指通过酶去除了糖的Fc区,而“非糖基化”是指原核细胞,优选大肠杆菌,产生的非糖基化Fc片段。
此外,本发明的IgG4 Fc片段可以是被非肽聚合物修饰的IgG4 Fc片段。优选的,本发明的IgG4 Fc片段可以是被聚乙二醇修饰的IgG4 Fc片段。被聚乙二醇修饰的IgG4 Fc片段可通过在pH 7或更高、优选pH 7.5至pH 9、并且更优选pH 8.0下,与聚乙二醇反应来制备。
如本文所用,术语“修饰铰链区”是指这样的铰链区:其中SEQ ID NO:1(天然IgG4Fc片段铰链区的序列)的氨基酸序列的第8位和第11位半胱氨酸残基中的任一个半胱氨酸残基被删除,另外还有部分氨基酸被进一步删除。
本发明中,铰链区中删除的氨基酸残基数可在1至8个的范围内,并且具体地,氨基酸残基(一个或多个)可以是连续的或不连续的。具体地,例如,本发明的修饰铰链区可包括仅删除第8位或第11位的一个半胱氨酸残基;或删除包括第8位半胱氨酸残基的2至8个连续或不连续的氨基酸;或删除包括第11位半胱氨酸残基的2至8个连续或不连续的氨基酸。
本发明的修饰铰链区可具有例如下面显示的氨基酸序列中的至少一种氨基酸序列:
Glu-Ser-Lys-Tyr-Gly-Pro-Pro-Pro-Ser-Cys-Pro、
Glu-Ser-Lys-Tyr-Gly-Pro-Pro-Cys-Pro-Ser-Pro、
Glu-Ser-Lys-Tyr-Gly-Pro-Pro-Cys-Pro-Ser、
Glu-Ser-Lys-Tyr-Gly-Pro-Pro-Cys-Pro-Pro、
Lys-Tyr-Gly-Pro-Pro-Cys-Pro-Ser、
Glu-Ser-Lys-Tyr-Gly-Pro-Pro-Cys、
Glu-Lys-Tyr-Gly-Pro-Pro-Cys、
Glu-Ser-Pro-Ser-Cys-Pro、
Glu-Pro-Ser-Cys-Pro、
Pro-Ser-Cys-Pro、
Glu-Ser-Lys-Tyr-Gly-Pro-Pro-Ser-Cys-Pro、
Lys-Tyr-Gly-Pro-Pro-Pro-Ser-Cys-Pro、
Glu-Ser-Lys-Tyr-Gly-Pro-Ser-Cys-Pro、
Glu-Ser-Lys-Tyr-Gly-Pro-Pro-Cys、
Lys-Tyr-Gly-Pro-Pro-Cys-Pro、
Glu-Ser-Lys-Pro-Ser-Cys-Pro、
Glu-Ser-Pro-Ser-Cys-Pro、
Glu-Pro-Ser-Cys。
在本发明的示例性实施方式中,为了检测大鼠血液和人血液中存在的IgG4与根据本发明的修饰IgG4 Fc片段和生理活性蛋白之间的缀合物之间的链交换机制,分别将大鼠血液和人血液与IgG4 Fc和生理活性蛋白之间的缀合物混合,并按照每个时间区收集样品,并利用生理活性蛋白的抗体进行Western印迹分析。结果证实,没有产生通过与大鼠IgG4或人IgG4链交换可产生的分子。
因此,当根据本发明所述的修饰IgG4 Fc片段用作药物载体时,其可以有效地用于增加药物的血清半衰期和提高药物的生理学活性,而不与体内天然免疫球蛋白交换。
根据另一方面,本发明提供编码修饰的具有铰链区的IgG4 Fc片段的核酸以及包含该核酸的载体,所述铰链区通过删除铰链区中的部分氨基酸而突变,从而仅包括一个半胱氨酸残基。
本发明的编码修饰IgG4 Fc片段的核酸包括编码如下修饰IgG4 Fc片段的核酸:所述修饰IgG4 Fc片段包括SEQ ID NO:2的氨基酸序列
(Pro-Ser-Cys-Pro-Ala-Pro-Glu-Phe-Leu-Gly-
Gly-Pro-Ser-Val-Phe-Leu-Phe-Pro-Pro-Lys-
Pro-Lys-Asp-Thr-Leu-Met-Ile-Ser-Arg-Thr-
Pro-Glu-Val-Thr-Cys-Val-Val-Val-Asp-Val-
Ser-Gln-Glu-Asp-Pro-Glu-Val-Gln-Phe-Asn-
Trp-Tyr-Val-Asp-Gly-Val-Glu-Val-His-Asn-
Ala-Lys-Thr-Lys-Pro-Arg-Glu-Glu-Gln-Phe-
Asn-Ser-Thr-Tyr-Arg-Val-Val-Ser-Val-Leu-
Thr-Val-Leu-His-Gln-Asp-Trp-Leu-Asn-Gly-
Lys-Glu-Tyr-Lys-Cys-Lys-Val-Ser-Asn-Lys-
Gly-Leu-Pro-Ser-Ser-Ile-Glu-Lys-Thr-Ile-
Ser-Lys-Ala-Lys-Gly-Gln-Pro-Arg-Glu-Pro-
Gln-Val-Tyr-Thr-Leu-Pro-Pro-Ser-Gln-Glu-
Glu-Met-Thr-Lys-Asn-Gln-Val-Ser-Leu-Thr-
Cys-Leu-Val-Lys-Gly-Phe-Tyr-Pro-Ser-Asp-
Ile-Ala-Val-Glu-Trp-Glu-Ser-Asn-Gly-Gln-
Pro-Glu-Asn-Asn-Tyr-Lys-Thr-Thr-Pro-Pro-
Val-Leu-Asp-Ser-Asp-Gly-Ser-Phe-Phe-Leu-
Tyr-Ser-Arg-Leu-Thr-Val-Asp-Lys-Ser-Arg-
Trp-Gln-Glu-Gly-Asn-Val-Phe-Ser-Cys-Ser-
Val-Met-His-Glu-Ala-Leu-His-Asn-His-Tyr-
Thr-Gln-Lys-Ser-Leu-Ser-Leu-Ser-Leu-Gly-Lys)。例如,本发明的核酸可包括以下
SEQ ID NO:3的核苷酸序列
(CCATCATGCCCAGCACCTGAGTTCCTGGGGGGACCATCAGTCTTCCTGTTCCCCCCAAAACCCAAGGACACCCTCATGATCTCCCGGACCCCTGAGGTCACATGCGTGGTGGTGGACGTGAGCCAGGAAGACCCTGAGGTCCAGTTCAACTGGTACGTGGACGGCGTGGAGGTGCATAATGCCAAGACAAAGCCGCGGGAGGAGCAGTTCAACAGCACGTACCGTGTGGTCAGCGTCCTCACCGTCCTGCACCAGGACTGGCTGAATGGCAAGGAGTACAAGTGCAAGGTCTCCAACAAAGGCCTCCCATCCTCCATCGAGAAAACCATCTCCAAAGCCAAAGGGCAGCCCCGAGAACCACAGGTGTACACCCTGCCCCCATCCCAGGAGGAGATGACCAAGAACCAGGTCAGCCTGACCTGCCTGGTCAAAGGCTTCTATCCCAGCGACATCGCCGTGGAGTGGGAGAGCAATGGGCAGCCGGAGAACAACTACAAGACCACGCCTCCCGTGCTGGACTCCGACGGCTCCTTCTTCCTCTACAGCAGGCTAACCGTGGACAAGAGCAGGTGGCAGGAGGGGAACGTCTTCTCATGCTCCGTGATGCATGAGGCTCTGCACAACCACTACACACAGAAGAGCCTCTCCCTGTCTCTGGGTAAA)。
如本文所用,术语“载体”(vector)是指能够在合适的宿主细胞中表达靶蛋白的重组载体,其是包含可操作地连接以实现插入基因的表达的调控因子的基因构建体可操作地连接。
如本文所用,术语“可操作地连接”意为核酸的调控序列与编码靶蛋白的序列功能性地连接,使得大体功能可以展现。与载体可操作的连接可通过本领域公知的遗传重组技术完成,并且位点特异性DNA切割和连接可容易利用本领域一般公知的酶等进行。合适的表达载体可包括表达调控元件如启动子、起始密码子、终止密码子、多腺苷酸信号和增强子的序列。当基因构建体被插入个体时,起始密码子和终止密码子应在个体中基本上发挥其功能,并且应与编码序列位于框内。一般的启动子可以是组成型的或诱导型的。表达载体还可包括选择标记,用于选择包含该载体的宿主细胞,并且对于可复制的表达载体而言,其可包括复制起点。
另一方面,本发明提供引入了上述载体的微生物,其能够生产修饰的IgG4 Fc片段。
基于本发明的目的,微生物优选是真核细胞。真核细胞可以是大肠杆菌(Escherichia coli)、枯草芽孢杆菌(Bacillus subtilis)、链霉菌(Streptomyces)、假单胞菌(Pseudomonas)、奇异变形杆菌(Proteus mirabilis)、葡萄球菌(Staphylococcus)等,并且优选是大肠杆菌。大肠杆菌可以是大肠杆菌XL-1blue、大肠杆菌BL21(DE3)、大肠杆菌JM109、大肠杆菌DH系列、大肠杆菌TOP10和大肠杆菌HB101,更优选大肠杆菌BL21(DE3),但并不局限于此。当大肠杆菌被用作宿主细胞时,免疫球蛋白Fc区可以如下形式生成:天然免疫球蛋白的CH2结构域中存在的糖原来就被删除,因为大肠杆菌不具有使聚糖与蛋白质缀合的系统。虽然存在于天然免疫球蛋白的CH2结构域中的糖不影响免疫球蛋白的结构稳定性,但已知免疫球蛋白可以结合至Fc受体表达细胞并引起抗体依赖性细胞毒性(ADCC),诱导免疫细胞分泌细胞因子,从而引起炎性反应,并且结合至补体的C1q成分并引起补体固着反应。因此,如果非糖基化免疫球蛋白的Fc区生成并缀合至治疗性蛋白,则治疗性蛋白的血清浓度可以长时间保持,而不引起免疫球蛋白的效应子功能。
上述载体在原核细胞中的转化方法可包括可以将核酸引入细胞的任何方法,并且转化可通过选择本领域已知的适于给定宿主细胞的标准技术进行。方法的实例可包括电穿孔、原生质体融合、磷酸钙(CaPO4)沉淀、氯化钙(CaCl2)沉淀,利用碳化硅纤维的搅拌、PEG、硫酸葡聚糖、脂质转染胺等,但并不限于此。
引入了重组表达载体的微生物可按照常规方法培养。
培养方法可在根据所选微生物做出简单调整后使用。通常,用于培养的培养基应含有细胞生长和存活所必需的所有养分。培养基可含有多种碳源、氮源和微量元素成分。碳源的实例可包括碳水化合物,如葡萄糖、蔗糖、乳糖、果糖、麦芽糖、淀粉和纤维素;脂肪,如大豆油、葵花籽油、蓖麻油和椰子油;脂肪酸,如棕榈酸、硬脂酸和亚油酸;醇,如甘油和乙醇;以及有机酸,如乙酸。这些碳源可单独或组合使用。氮源的实例可包括有机氮源,如蛋白胨、酵母提取物、肉汤、麦芽提取物、玉米浸提浆(CSL)和大豆粉;以及无机氮源,如尿素、硫酸铵、氯化铵、磷酸铵、碳酸铵和硝酸铵。这些氮源可单独或组合使用。在上述培养基中,可含有磷酸二氢钾、磷酸氢二钾和相应的含钠盐作为磷源。此外,可含有金属盐,如硫酸镁或硫酸铁。此外,还可含有氨基酸、维生素和合适的前体。在培养期间,可调节培养物的pH——通过以适当的方式向培养物中加入诸如氢氧化铵、氢氧化钾、氨、磷酸和硫酸的化合物。此外,在培养期间,可加入消泡剂,如脂肪酸聚乙二醇酯,以防止泡沫生成。此外,为了保持培养物的有氧状态,可将氧气或含氧气体(例如空气)注入培养物。培养温度通常可以是20℃至45℃,优选25℃至40℃。此外,可使用发酵罐。当利用发酵罐生产蛋白质时,应当考虑包括宿主细胞的生长速率和表达产物量的多种因素。可通过在合适的培养条件下加入IPTG或类似物来诱导蛋白质表达。本发明的修饰IgG4 Fc片段可以聚集物形式在宿主细胞中过表达,或者可以含水形式表达。不管其表达类型是什么,都可通过常规蛋白质纯化方法来纯化该蛋白质。
因此,另一方面,本发明提供制备修饰IgG4 Fc片段的方法,并且该方法包括培养微生物,该微生物中引入了编码修饰IgG4 Fc片段的核酸。
根据上述方法,在诸如大肠杆菌的原核生物的细胞中生成的上述IgG4 Fc片段的工业应用不被具体限制。示例性应用可以是将其用作载体,与任意药物一起形成缀合物。
因此,另一方面,本发明提供药物和药物缀合物,其中修饰的IgG4 Fc片段通过连接体缀合至其。
如本文所用,药物缀合物或缀合物意为至少一种药物与至少一种修饰的IgG4 Fc片段彼此连接。
如本文所用,药物是指当给予人或动物时可呈现治疗活性的物质,并且其可包括多肽、化合物、提取物、核酸等,但不局限于此。优选地,药物是多肽药物。
如本文所用,生理活性多肽药物、多肽药物和蛋白质药物被理解为具有相同的含义,其特征是其是对各种体内生理现象显示拮抗的生理活性类型。
IgG4 Fc片段与药物缀合的缀合物类型并不被具体限制,并且IgG4 Fc片段和药物可以各种比例缀合。
本发明中,连接体可以是指肽连接体和非肽连接体,优选非肽连接体,更优选非肽聚合物。
非肽聚合物是指与至少两个重复单元缀合的生物相容性聚合物,并且重复单元通过除肽键以外的随机共价键彼此连接。非肽聚合物可选自聚乙二醇、聚丙二醇、乙二醇和丙二醇之间的共聚物、聚氧乙基化多元醇、聚乙烯醇、多糖、葡聚糖、聚乙烯乙醚、可生物降解的聚合物如聚乳酸(PLA)和聚乳酸-乙醇酸(PLGA)、脂质聚合物、几丁质、透明质酸及其组合,并且优选聚乙二醇。本领域已知的衍生物和可容易利用本领域技术制备的衍生物也包括在本发明范围内。
本发明中,非肽聚合物可具有两个或三个反应性末端,并且非肽聚合物的末端反应性基团优选选自反应性醛基、丙醛基、丁醛基、马来酰亚胺基和琥珀酰亚胺衍生物。琥珀酰亚胺衍生物的实例可包括琥珀酰亚胺丙酸基、羟基琥珀酰亚胺基、琥珀酰亚胺基羧甲基和琥珀酰亚胺碳酸基。具体地,当非肽聚合物其末端包括反应性醛基作为反应性基团时,其可以使非特异性反应最小化并且在其分别结合至生理多肽和免疫球蛋白Fc片段方面是有效的。通过醛结合导致还原性烷基化所产生的终产物比通过酰胺结合更加稳定。在低pH下,醛反应性基团选择性地在N端反应,而在高pH下,例如pH 9.0,其可以与赖氨酸残基形成共价键。
非肽聚合物的末端反应性基团彼此可以是相同的或不同的。例如,非肽聚合物可在一端具有马来酰亚胺基,而在另一端具有醛基、丙醛基或丁醛基。当使用在两端都具有羟基反应性基团的聚乙二醇或非肽聚合物时,可根据已知的化学反应通过用各种反应性基团活化羟基,或者利用市售的具有修饰的反应性基团的聚乙二醇,来制备本发明的缀合物。
至于通过结合至本发明的修饰IgG4 Fc片段而使用的生理活性多肽,需要增加血清半衰期的任何物质都可被没有限制地使用。例如,可以使用各种生理活性多肽,如细胞因子、白介素、白介素结合蛋白、酶、抗体、生长因子、转录调控因子、血液凝固因子、疫苗、结构蛋白、配体蛋白或受体、细胞表面抗原、受体拮抗剂、其衍生物及其类似物。
具体地,生理活性多肽可包括人生长激素、生长激素释放激素、生长激素释放肽、干扰素和干扰素受体(例如,干扰素-α、-β和-γ,可溶性I型干扰素受体等)、集落刺激因子、白介素(例如,白介素-1、-2、-3、-4、-5、-6、-7、-8、-9、-10、-11、-12、-13、-14、-15、-16、-17、-18、-19、-20、-21、-22、-23、-24、-25、-26、-27、-28、-29、-30等)和白介素受体(例如,IL-1受体、IL-4受体等)、酶(例如,葡糖脑苷脂酶、艾杜糖醛酸-2-硫酸酯酶、α-半乳糖苷酶-A、半乳糖苷酶α、β、α-L-艾杜糖醛酸酶、丁酰胆碱酯酶、几丁质酶、谷氨酸脱羧酶、伊米苷酶(imiglucerase)、脂酶、尿酸酶、血小板活化因子乙酰水解酶、中性内肽酶、髓过氧化物酶等)、白介素结合蛋白和细胞因子结合蛋白(例如,IL-18bp、TNF结合蛋白等)、巨噬细胞活化因子、巨噬细胞肽、B细胞因子、T细胞因子、蛋白A、过敏抑制因子、坏死糖蛋白、免疫毒素、淋巴毒素、肿瘤坏死因子、肿瘤抑制剂、转化生长因子、α-1抗胰蛋白酶、白蛋白、α-乳清蛋白、载脂蛋白-E、促红细胞生成素、高糖基化促红细胞生成素、血管生成素、血红蛋白、凝血酶、凝血酶受体激活肽、血栓调节蛋白、血液凝固因子VII、血液凝固因子VIIα、血液凝固因子VIII、凝固因子IX、血液凝固因子XIII、纤溶酶原激活因子、纤维蛋白结合肽、尿激酶、链激酶、水蛭素、蛋白C、C-反应蛋白、肾素抑制剂、胶原酶抑制剂、超氧化物歧化酶、瘦蛋白、血小板源性生长因子、上皮生长因子、表皮生长因子、制管张素、血管紧张素、骨形态发生生长因子、骨形态发生蛋白、降钙素、胰岛素和胰岛素衍生物、心房肽激素、软骨诱导因子、依降钙素(elcatonin)、结缔组织活化因子、组织因子途径抑制物、卵泡刺激激素、促黄体激素、促黄体激素释放激素、神经生长因子(例如,神经生长因子、睫状节神经细胞营养因子、轴生成因子-1(axogenesis factor-1)、脑促尿钠排泄肽、胶质细胞源性神经营养因子、导蛋白、嗜中性抑制因子、神经营养因子,微中子(neutrin)等)、甲状旁腺激素、松弛素、分泌素、生长调节素、胰岛素样生长因子、肾上腺皮质激素、胰高血糖素、包括胰高血糖素样肽-1和毒晰外泌肽-4的促胰岛素释放肽、肠道中分泌的肠降血糖素、包含对代谢综合征有效的轻粒子(lepton)和神经细胞因子的脂肪细胞、缩胆囊素、胰多肽、胃泌素释放肽、促肾上腺皮质激素释放因子、甲状腺刺激激素、autotaxin、乳铁蛋白、肌生成抑制素(myostatin)、受体(例如TNFR(P75)、TNFR(P55)、IL-1受体、VEGF受体、B细胞活化因子受体等)、受体拮抗剂(例如IL1-Ra等)、细胞表面抗原(例如CD 2、3、4、5、7、11a、11b、18、19、20、23、25、33、38、40、45、69等)、单克隆抗体、多克隆抗体、抗体片段(例如scFv、Fab、Fab'、F(ab')2和Fd)、病毒源性疫苗抗原等,但不限于此。可用于本发明的生理活性多肽可以是天然型;原核细胞如大肠杆菌、或真核细胞如酵母细胞、昆虫细胞、或动物细胞中通过遗传重组产生的生理活性多肽;或具有等同于天然型的活性并且在至少一个氨基酸位置具有突变的衍生物。
本发明的修饰IgG4 Fc片段可在利用定向遗传重组法将其连接至生理活性多肽作为单个基因序列之后在细胞中生成,或者IgG4 Fc片段可独立地生成并在体外与药物如生理活性多肽缀合。
在又一个方面,本发明提供包含本发明的上述药物缀合物作为活性成分的药物组合物。
含有本发明缀合物的药物组合物可包括药学上可接受的载体。药学上可接受的载体的实例可包括粘合剂、润滑剂、崩解剂、赋形剂、增溶剂、分散剂、稳定剂、悬浮剂、着色剂、调味剂等;对于注射制剂而言,缓冲剂、防腐剂、止痛剂、等渗剂、稳定剂等可被混合使用;而对于局部制剂而言,可使用碱、赋形剂、润滑剂、防腐剂等。
根据本发明所述的药物组合物的制剂类型可通过与药学上可接受的载体组合被以各种形式制备。例如,就口服给予而言,药物组合物可被配制成片剂、锭剂、胶囊、酏剂、悬浮液、糖浆剂、糯米纸囊剂(wafer)等。就注射而言,药物组合物还可被配制在单剂量安瓿瓶或多剂量容器中。药物组合物还可被配制成溶液、悬浮液、片剂、胶囊和持续释放制剂。
同时,适当载体、赋形剂和稀释剂的实例可包括乳糖、葡萄糖、蔗糖、山梨醇、甘露醇、木糖醇、赤藓糖醇、麦芽糖醇、淀粉、阿拉伯胶、海藻酸盐(酯)、明胶、磷酸钙、硅酸钙、纤维素、甲基纤维素、微晶纤维素、聚乙烯吡咯烷酮、水、羟基苯甲酸甲酯、羟基苯甲酸丙酯、滑石、硬脂酸镁、矿物油等。此外,本发明的组合物可进一步包含填充剂、抗凝剂、润滑剂、湿润剂、调味剂、乳化剂、防腐剂等。
在本发明中,其中IgG4 Fc片段用作载体的药物的实际剂量将基于用作活性成分的药物的类型连同诸如待治疗疾病、给药途径、患者年龄、性别和体重、疾病严重程度等的各种因素来确定。由于本发明的药物组合物具有极好的体内持续时间,因此本发明药物制剂的给予次数和频率可以显著降低。
本发明的药物制剂可通过多种途径给予。
如本文所用,术语“给予”是指通过适当的方式将具体物质引入患者,只要药物可以到达靶组织,本发明的缀合药物可通过任何常规路径给予。例如,可实施腹膜内、静脉内、肌内、皮下、皮内、口服、局部、鼻内、肺内和直肠内给予,但给予途径不限于此。但是,由于肽在口服给予后被消化,因此用于口服给予的组合物的活性成分应被包衣或配制,以防止在胃中降解。优选地,本发明组合物可以可注射形式给予。此外,药物组合物可利用能够将活性成分运送至靶细胞的某种设备来给予。
[发明详述]
下文将参考以下实施例对本发明进行更详细描述。但是,这些实施例仅以示例为目的,而非意图通过这些实施例来限制本发明。
实施例1.人粒细胞集落刺激因子-PEG-免疫球蛋白缀合物的制备
<1-1>表达IgG4 Fc结构域的载体的构建
为克隆包含IgG4铰链区的重链Fc区,使用从人血液中收集的血细胞作为模板进行RT-PCR,如下所述。首先,从约pH 6的血液中分离全RNA,并利用Qiamp RNA血液试剂盒(Qiagen),基于RNA模板,对基因进行扩增。具体地,使用SEQ ID NO:4(gggcatatgccatcatgccc agcacctgag ttcctgggg)和SEQ ID NO:5(gggggatccc tatttacccagagacaggga ga)对作为引物。为了便于后续过程,将能够识别NdeI限制位点和ATG(蛋白质表达所需的密码子)的结构域插入引物,并且将能够识别BamHI限制位点的结构域插入SEQID NO:5的3-引物。将由此扩增的Fc区产物分别用NdeI和BamHI切割,并亚克隆到pET22b(Novagen Co.,Ltd.)中,以制备质粒。设计质粒,使得IgG4 Fc片段可以包括这样的铰链序列:其中IgG4 Fc铰链中的Glu-Ser-Lys-Tyr-Gly-Pro-Pro-Cys-Pro-Ser-Cys-Pro的整个氨基酸序列的第1至8位的氨基酸残基被删除。
本实施例中制备的质粒被称为“pmHMC001”,并且其序列分析的结果显示,编码IgG4 Fc片段的核酸具有SEQ ID NO:3的核苷酸序列,在表达时IgG4 Fc片段具有SEQ IDNO:2的氨基酸序列。
将由此制备的表达载体转化到大肠杆菌BL21(DE3)中,从而制备出大肠杆菌转化株,大肠杆菌BL21/pmHMC001(HMC001)。
<1-2>IgG4 Fc区的表达和纯化
将在实施例<1-1>中得到的微生物转化株接种到待发酵的发酵罐(MarubishiCo.,Ltd.)中,并对IgG4 Fc片段的表达进行检测。
首先,将置于100mL LB培养基中的上述转化株在振荡水浴中培养过夜,然后接种到发酵罐中继续培养。将发酵罐保持在35℃或28℃,并且培养在其中以20vvm供应空气的同时通过500rpm的振荡开始,以防止其中的状态变成无氧。随着发酵进行,根据微生物的发酵状态,利用葡萄糖和酵母提取物补充微生物生长缺少的能源,并且当600nm的OD达到80时,通过向其添加IPTG(诱导剂)来诱导表达。培养进行40小时至45小时,直到600nm的OD达到100至120的范围,以得到高浓度培养物。
大肠杆菌转化株中IgG4 Fc的表达通过下述实验证实。
为了证实IgG4 Fc在细胞质中完全表达,将部分发酵液与等量的2x蛋白缓冲滴液(peotein drip buffer)混合,并在15%SDS-PAGE(Criterion Gel,Bio-Rad)中进行电泳。结果证实IgG Fc在所制转化株中过表达。过表达的蛋白质显示形成凝固物,以相同的方式通过重折叠和柱操作从凝固物纯化蛋白质。首先,将10g的细胞溶解于100mL的裂解缓冲液(10mM Tri,pH 9.0、1mM EDTA、0.5%Triton X-100和0.2M NaCl)中,然后进行超声处理。将所得物以10,000rpm离心20分钟,以使其分离成可溶部分和不可溶部分,并将2g不可溶凝固物溶解于20mL的增溶缓冲液(6M胍和50mM Tris)中,然后使其在4、温和搅拌下反应30分钟。反应完成后,通过添加10倍体积的重折叠缓冲液(2M尿素、50mM Tris、0.25M精氨酸、3mM半胱氨酸、pH 9.0)稀释所得物,然后在温和搅拌下使其反应过夜。反应完成后,利用SephadexG25,样品中加入新制10mM Tris-HCl(pH 8.0)缓冲液。将缓冲液更换的样品,利用DEAE-FF(GE healthcare),在Tris-HCl(pH 8.0)和NaCl的浓度梯度下洗脱,并且以硫酸铵和10mMTris-HCl(pH 7.5)的浓度梯度洗脱苯基-FF(GE healthcare),以去除大量的多聚体和单体。关于随后的柱法,利用Sephadex G25(GE healthcare),将所得物用10mM Tri(pH 7.5)脱盐,然后为了得到高纯度IgG4 Fc,以10mM Tris-HCl(pH 7.5)和NaCl的浓度梯度洗脱15Q(GE healthcare),并最终得到IgG4 Fc。
<1-3>药物缀合物I的制备
1)粒细胞集落刺激因子和PEG之间的缀合物的制备
将ALD-PEG-ALD(Shearwater Inc.,USA)——两末端都具有醛反应基团的分子量为3.4kDa的聚(乙二醇)——添加至以浓度5mg/mL溶解粒细胞集落刺激因子的100mM磷酸盐缓冲液中,以使粒细胞集落刺激因子:PEG的摩尔比为1:5。向其中加入氰基硼氢化钠(NaCNBH3)(还原剂)至20mM的最终浓度,并在缓慢搅拌的同时于4反应3小时。为了得到其中PEG选择性地缀合至粒细胞集落刺激因子的氨基末端并且PEG和粒细胞集落刺激因子以1:1的比例缀合的缀合物,对反应混合物进行Superdex尺寸排阻色谱(Superdex R,Pharmacia,USA)。利用10mM磷酸钾缓冲液(pH 6.0)作为洗脱液纯化集落刺激因子,而去除未与PEG缀合的粒细胞集落刺激因子、未反应的PEG和二聚体副产物(其中PEG与两个粒细胞集落刺激因子缀合)。将纯化的粒细胞集落刺激因子-PEG缀合物浓缩至5mg/mL。
2)粒细胞集落刺激因子-PEG缀合物和IgG4 Fc片段之间的缀合物的形成
将本发明的IgG4 Fc片段溶解于100mM磷酸盐缓冲液中。为了使IgG4 Fc片段与上述纯化的粒细胞集落刺激因子-PEG缀合物的反应性醛基缀合,将粒细胞集落刺激因子-PEG缀合物添加至包含IgG4 Fc片段的缓冲液,使得粒细胞集落刺激因子-PEG缀合物:IgG4 Fc片段的摩尔比为1:5。向其中加入氰基硼氢化钠(NaCNBH3)(还原剂)至20mM的最终浓度,并使其在缓慢搅拌的同时于4反应20小时。在缀合反应完成后,除去未反应的物质和副产物,并通过阴离子交换色谱纯化粒细胞集落刺激因子-PEG-免疫球蛋白缀合物。通过如下纯化粒细胞集落刺激因子-PEG-IgG4 Fc片段缀合物:将上述反应混合物添加至用20mM Tris缓冲液(pH 7.5)平衡的DEAE柱(Pharmacia,USA),然后利用线性浓度梯度法(NaCl浓度:0M→0.5M)使包含1M NaCl的相同缓冲液流过。为了除去少量未反应的免疫球蛋白和作为杂质与由此得到的粒细胞集落刺激因子-PEG-IgG4 Fc片段的部分混合的人生长激素,另外进行阳离子交换色谱。将粒细胞集落刺激因子-PEG-IgG4 Fc片段的部分添加至用10mM醋酸钠(pH4.5)平衡的polyCAT柱(PolyLC,USA),并另外通过利用线性浓度梯度法(NaCl浓度:0M→0.5M)使包含1M NaCl的10mM醋酸钠(pH 4.5)缓冲液流过其上来进行纯化,并由此得到纯净的粒细胞集落刺激因子-PEG-IgG4 Fc片段缀合物(HM10460A)。
实施例2:在大鼠血液中人粒细胞集落刺激因子-PEG-免疫球蛋白缀合物和人IgG4之间的链交换的证实
通过与20mg/mL的生物素-7-NHL溶液以1:10的分子比混合,将2mg量的人IgG4进行生物素标记,并用生物素蛋白质标记试剂盒(Roche)纯化。基于抗凝目的,将从正常大鼠中收集的血液用肝素处理,并添加青霉素-链霉素(1%v/v)。将1.5mg生物素标记的IgG4和1.32mg HM10460A添加到3mL血液中,混合在一起,将混合液等分到6只管中(0.5mL/管),并在37℃培养箱内进行培育。分别在0小时、4小时、10小时、24小时和48小时的时间取出一只管,并从中分离血浆,储存在-20℃。将每个血浆样品和标准品物质与非还原性蛋白质样品缓冲液混合,并利用4%至15%浓度梯度聚丙烯酰胺凝胶对反应产物进行SDS-PAGE。生物素标记的IgG4和HM10460A用作标准品物质。在电泳完成后,将凝胶印迹到PVDF膜(Immobilon-P,MILLIPORE)上,并利用抗人GCSF抗体和抗生蛋白链菌素-HRP进行分析。关于抗体结合条件,分别地,抗人IgG Fc抗体(Sigma)在以1;150000的比例稀释后用于5%脱脂乳封闭条件,抗-人GCSF抗体(人G-CSF分析试剂盒.IBL)以1:2000的比例稀释后用于1%脱脂乳封闭条件,抗生蛋白链菌素-HRP以1:5000的比例稀释后用于5%脱脂乳封闭条件。证实HM10460A通过HM10460A自身之间的链交换机制形成二聚体(94kDa)——其中每个IgG4 Fc片段具有两个G-CSF——和IgG4 Fc片段(50kDa)。
相比之下,当HM10460A诱导HM10460A和人IgG4之间的相互链交换反应时,预期形成100kDa和122kD尺寸的分子。然而,通过Western印迹分析观察不到这些分子。相反,当通过抗生蛋白链菌素-HRP分析时,人IgG4泳道上出现了75kDa带,这证实从人IgG4形成了单体,而这原本就是人IgG4二聚体的特性(图1)。
实施例3.人血液中人粒细胞集落刺激因子-PEG-免疫球蛋白缀合物和人IgG4之间的链交换的确定
向从捐赠者收集的人血液添加青霉素-链霉素(1%v/v)。将1.32mg实施例1制备的的HM10460A与3mL血液混合,并将混合液等分到6只管中(0.5mL/管),并在37℃培养箱内进行培育。分别在0小时、4小时、10小时、24小时和48小时的时间取出一只管,并从中分离血浆,在分析之前储存在-20℃。将每个血浆样品和HM10460A以及不同浓度的IgG4 Fc片段(作为对照物)与非还原性蛋白样品缓冲液混合,并利用4%至15%浓度梯度聚丙烯酰胺凝胶对所得物进行SDS-PAGE。在电泳完成后,将凝胶印迹到PVDF膜(Immobilon-P,MILLIPORE)上,并利用抗人GCSF抗体进行分析。抗人GCSF抗体(人G-CSF分析试剂盒.IBL)在以1:2000的比例稀释后用于1%脱脂乳封闭条件。没有形成在大鼠血液中可通过与人IgG4链交换形成的100kDa和122kD尺寸的分子(图2)。
本领域普通技术人员将知道,本发明可以在不偏离其精神或重要特征的情况下以其它具体形式实施。所述实施方式各方面都被认为只是示例,而非限制。因此,本发明的范围由所附权利要求限定,而非前文描述。权利要求的等同形式的含义和范围内的所有变化都将被包括在本发明范围内。
Claims (6)
1.药物缀合物,其中由SEQ ID NO:2的氨基酸序列组成的IgG4 Fc片段通过连接体缀合至其;并且
其中所述IgG4 Fc片段中不发生体内链交换和单体形成。
2.权利要求1所述的药物缀合物,其中所述药物选自人生长激素、生长激素释放激素、生长激素释放肽、干扰素和干扰素受体、集落刺激因子、白介素和白介素受体、酶、白介素结合蛋白和细胞因子结合蛋白、巨噬细胞活化因子、巨噬细胞肽、B细胞因子、T细胞因子、蛋白A、过敏抑制因子、坏死糖蛋白、免疫毒素、淋巴毒素、肿瘤坏死因子、肿瘤抑制剂、转化生长因子、α-1抗胰蛋白酶、白蛋白、α-乳清蛋白、载脂蛋白-E、促红细胞生成素、高糖基化促红细胞生成素、血管生成素、血红蛋白、凝血酶、凝血酶受体激活肽、血栓调节蛋白、血液凝固因子VII、血液凝固因子VIIα、血液凝固因子VIII、凝固因子IX、血液凝固因子XIII、纤溶酶原激活因子、纤维蛋白结合肽、尿激酶、链激酶、水蛭素、蛋白C、C-反应蛋白、肾素抑制剂、胶原酶抑制剂、超氧化物歧化酶、瘦蛋白、血小板源性生长因子、上皮生长因子、表皮生长因子、制管张素、血管紧张素、骨形态发生生长因子、骨形态发生蛋白、降钙素、胰岛素和胰岛素衍生物、心房肽激素、软骨诱导因子、依降钙素、结缔组织活化因子、组织因子途径抑制物、卵泡刺激激素、促黄体激素、促黄体激素释放激素、神经生长因子(包括神经生长因子、睫状节神经细胞营养因子、轴生成因子-1、脑促尿钠排泄肽、胶质细胞源性神经营养因子、导蛋白、嗜中性抑制因子、神经营养因子和微中子)、甲状旁腺激素、松弛素、分泌素、生长调节素、胰岛素样生长因子、肾上腺皮质激素、胰高血糖素、包括胰高血糖素样肽-1和毒晰外泌肽-4的促胰岛素肽、肠道中分泌的肠降血糖素、包含对代谢综合征有效的轻粒子和神经细胞因子的脂肪细胞、缩胆囊素、胰多肽、胃泌素释放肽、促肾上腺皮质激素释放因子、甲状腺刺激激素、autotaxin、乳铁蛋白、肌生成抑制素、受体、受体拮抗剂、细胞表面抗原、单克隆抗体、多克隆抗体、抗体片段和病毒源性疫苗抗原。
3.权利要求1所述的药物缀合物,其中所述药物是粒细胞集落刺激因子。
4.权利要求1所述的药物缀合物,其中所述连接体是非肽基聚合物。
5.权利要求4所述的药物缀合物,其中所述非肽基聚合物具有两个或三个反应性末端。
6.药物组合物,其包括权利要求1-5中任一项所述的缀合物。
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