CN101007851B - 抗人类b淋巴细胞限制分化抗原的嵌合及放射标记抗体 - Google Patents
抗人类b淋巴细胞限制分化抗原的嵌合及放射标记抗体 Download PDFInfo
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Abstract
本文公开了为治疗B细胞淋巴瘤设计的治疗学处理方法。这些方法基于包括使用免疫活性鼠/人嵌合抗-CD20抗体、放射性标记抗-CD20抗体给药的治疗策略,以及包括使用嵌合抗-CD20抗体及放射标记抗-CD20抗体的协作策略。
Description
此案是申请日为1993年11月12日、中国申请号为93121424.6、发明名称为“抗人类B淋巴细胞限制分化抗原的嵌合及放射标记抗体”的发明申请的分案申请。
所列的整个本文件准备讨论的参考文献,仅为本文描述本文件申请日以前的情报所用,本文不构成承认(或者表示,或者暗示)这些参考文献为“先有技术”,或这些发明人无权由于先发明的优势或根据较早递交申请的优先权把这些描述的日期说得早于实际日期。
本发明针对使用抗B细胞表面抗原Bp35(CD20)的嵌合及放射标记抗体治疗B细胞淋巴瘤。
脊椎动物(例如灵长目,包括人、猿、猴等)的免疫系统由许多器官和细胞类型组成。这些器官及细胞类型进化出以下功能:准确和特异性地识别侵入脊椎动物宿主的外来微生物(抗原);特异性地与这些外来微生物结合;并且清除/破坏这些外来微生物。在其它一些类型中,淋巴细胞对于免疫系统来说是关键性的。淋巴细胞在胸腺,脾脏及骨髓(成年的)中产生,并相当于人(成年人)循环系统中存在的总白血细胞的30%。有二种主要的淋巴细胞的亚群体:T细胞和B细胞。T细胞在细胞介导免疫中起作用,而B细胞在抗体产生(体液免疫)中起作用。然而T细胞和B细胞被认为在典型免疫反应中是相互依赖的,当T细胞受体结合于抗原片段(该片段结合于抗原呈递细胞表面上的主要组织相容性复合物(MHC)糖蛋白上)上时T细胞被激活;此种激活作用引起生物学介体(白细胞介素)释放,该介体实质上能刺激B细胞分化并产生抗该抗原的抗体(免疫球蛋白)。
在宿主中每种B细胞在其表面表达不同的抗体,因此,一种B细胞将表达对一种抗原特异性的抗体,而另一种B细胞将表达对不同的抗原特异性的抗体。由此,B细胞是十分多样性的,此种多样性对免疫系统来说是至关重要的。在人体中,每种B细胞可产生巨大数量的抗体分子(即约107至108)。当外来抗原被中和时,一般停止这种抗体产生(或者大大降低)。然而 偶然地特定B细胞的繁殖也会继续不断进行;这种繁殖可产生称为“B细胞瘤”的癌。
T细胞和B细胞二者均含表面蛋白,这些表面蛋白可被用作分化及鉴定的“标记”。一种这样的人B细胞标记是人B淋巴细胞限制分化抗原Bp35,称为“CD20”,“CD20”在B细胞发育前期的早期表达,并保持直至浆细胞分化。特别是该CD20分子可以调节激活过程中的步骤(该步骤为细胞周期启动及分化所要求的),并且通常在肿瘤B细胞中高水平表达。由定义可知CD20即存在于“正常”B细胞上,也存在于“恶性”B细胞上(即这些B细胞不停地繁殖可导致B细胞淋巴瘤)。因此,CD20表面抗原有可能作为对B细胞淋巴瘤“定靶”的候选物。
实质上,这样的定靶过程可归纳如下:将对CD20B细胞表面抗原特异性的抗体(例如)注射入患者体内,这些抗-CD20抗体便特异性结合到(明显地)正常及恶性B细胞二者的CD20细胞表面抗原上;结合于CD20表面抗原的抗-CD20抗体可引起肿瘤B细胞破坏并消耗掉。此外能破坏肿瘤的化学试剂或放射性标记也可与该抗-CD20抗体相连,以便该试剂能特异地输送到(例如)肿瘤B细胞处。不管采用什么方法,基本目的是破坏肿瘤,具体方法可由所使用的具体抗-CD20抗体来决定,因此定靶CD20抗原的可使用的方法是十分不同的。
例如已有多种定靶CD20表面抗原的尝试被报道过。鼠(小鼠)单克隆抗体1F5(一种抗-CD20抗体)已报道过以连续静脉输注到B细胞淋巴瘤患者的方式给药。据报道要耗尽循环的肿瘤细胞,要求极高的1F5水平(>2g),而其结果据说是“暂时的”(Press等人“Monoclonal Antibody子1F5(Anti-CD20)Serotherapy of Human B-CellLymphomas”Blood69/2:584-591(1987))。该方法的潜在问题是非人单克隆抗体(例如鼠单克隆抗体)一般缺乏人效应物功能,即它们不能介导补体依赖性溶解或通过抗体依赖性细胞毒性或Fc-受体介导的吞噬作用来溶解人靶细胞。而且非人单克隆抗体可由人宿主识别为外来蛋白,因此,反复注射此类外来抗体可产生导致有害过敏反应的免疫反应诱导作用。有关基于鼠的单克隆抗体,通常称为人抗-鼠抗体反应,或“HAMA”反应。此外,这些外来抗体可能受到宿主免疫系统的攻击,其结果使得它们在到达靶位之前被中和掉。
淋巴细胞和淋巴瘤对放射疗法的固有敏感性有如下几个原因:放射性 标记抗体的离子化射线的局部发射,可以杀死带或不带与结合抗原的抗体靠得很近的靶抗原(例如CD20)的细胞;穿透的射线可以消除在巨大的或不良的血管化肿瘤中有限地接近抗体的问题;而且所需的抗体总数可减少。放射性核素发射放射性粒子,该粒子可损害细胞DNA到细胞修复机制不能使细胞继续存活的程度;因此,假如靶细胞是肿瘤,放射性标记物可有利地杀死肿瘤细胞。根据定义,放射性标记抗体包括使用放射性物质,患者(即可能的骨髓移植)以及保健医生(即在带有放射性的条件下工作时需高度警惕)可能都需要采取预防措施。
因此,一种改进鼠单克隆抗体使之在治疗B细胞紊乱中有效的方法是将放射性标记或毒素连接到抗体上,以使标记或毒素位于肿瘤部位。例如,上面提到的IF5抗体已以碘-131(131I)做标记,并据报道在两个患者中进行过生物学分布评价,见Eary,J.F.等人“Imaging and Treatment of B-CellLymphoma”J.Nuc.Med.31/8:1257-1268(1990);也参见Press,O.W.等人,“Treatment of RefractoryNon-Hodgkin′s Lymphoma With Radiolabled MB-1(Anti-CD37)Antibody”J.Clin.Onc.7/8:1027-1038(1989)(表明一个经131I标记过的IF5治疗的患者达到部分反应);Goldenberg,D.M.等人,“Targeting,Dosimetry and Radioimmuno therapy of B-Cell Lymphomas WithIodine-131-Labeled LL2 Monoclonal antibody”J.Clin.Onc.9/4:548-564(1991)(接受多次注射的8个病人中的三个据报道产生了HAMA反应);Appelbaum,F.R.“Radiolabled Monoclonal Antibodies in the Treatment ofNon-Hodgkin′s Lymphoma”Hem./Onc.Clinics of N.A.5/5:1013-1025(1991)(文献综述),Press,O.W.等人“Radiolabled-Antibody Therapy of B-CellLymphoma With Autologous Bone Marrow Support”New England Journal of Medicine329/17:1219-12223(1993)(碘-131标记抗-CD20抗体IF5和B1);以及Kaminski,M.G.等人,“Radioimmuno-therapy of B-Cell Lymphoma With[131I]Anti-B1(Anti-CD20)Antibody”NEJM329/7(1993)(碘-131标记抗-CD20抗体B1;本文下面称之为“Kaminski”)。
也已将毒素(即羟柔毛霉素或丝裂霉素C之类的化疗剂)连接于抗体,参见例如PCT公开申请WO92/07466(1992年5月14日公开)。
“嵌合”抗体,即含有来自两种或多种不同物种(例如鼠和人)的各部分的抗体,已被开发为另一种连接抗体。例如Liu,A.Y.等人“Production of a Mouse-Human Chimeric Monoclonal Antibody to CD20 With PotentFc-Dependent Biologic Activity”J.Immun.139/10:3521-3526(1987),介绍了一种抗CD20抗原的鼠-人嵌合抗体。也参见PCT公开申请WO88/04936。然而在这篇参考文献中没有资料提供有关使用这类嵌合抗体治疗B细胞紊乱的能力、效力或实用性的内容。应注意,体外的功能性检测(例如补体依赖性溶胞(CDC);抗体依赖性细胞毒(ADCC)等)不可能当然地预料嵌合抗体破坏或消耗表达特异抗原的靶细胞的体内能力。参见例如Robinson,R.D.等人“Chimeric mouse-human anti-carcinoma antibodies that mediate differentanti-tumor cell biological activities”Hum Antibod Hybridomas2:84-93(1991)(检测不出ADCC活性的嵌合鼠-人抗体)。因此只有通过体内实验才可真正评价嵌合抗体的可能的治疗效力。
本技术领域所需的,可成为重大进展的工作是定靶CD20抗原以治疗灵长类包括(但不限于)人的B细胞淋巴瘤的治疗方法。
本文所公开的是为治疗B细胞紊乱,特别是B细胞淋巴瘤所设计的治疗方法。这些方法是基于施用免疫学活性的嵌合抗-CD20抗体用以消耗掉外周血B细胞,包括与淋巴瘤相关的B细胞;施用放射性标记抗-CD20抗体,用以定靶与局部和外周B细胞相关的肿瘤;以及用合作治疗策略,施用嵌合抗-CD20抗体和放射性标记抗-CD20抗体。
本发明包括:
第一项,治疗B细胞淋巴瘤的方法,包括给人施用治疗有效量的至少一种免疫活性嵌合抗-CD20抗体。
第二项,根据第一项的方法,其中施用于所说人的所说抗体量是所说人的每公斤体重约0.001至约30mg抗体之间(mg/kg)。
第三项,根据第一项的方法,其中所说抗体衍生自TCAE8中含抗-CD20的转染瘤,该TCAE8中的抗-CD20贮存于美国典型培养物中心,是ATCC贮存号69119的微生物的一部分。
第四项,根据第一项的方法,进一步还包括施用第二种治疗学上有效量的至少一种免疫活性嵌合抗-CD20抗体。
第五项,根据第四项的方法,其中所说的抗体附加给药于所说人,是在所说抗体对所说人的所说第一次给药之后的约7天内进行。
第六项,治疗B细胞淋巴瘤的方法,包括下述步骤:
1)在第一次给药期间,第一次给人治疗有效量的免疫活性嵌合抗-CD20抗体;
2)在第二次随后给药期间,给与第二次治疗有效量的所说抗体;
3)在第三次随后给药期间,给与第三次治疗有效量的所说抗体。
第七项,根据第六项的方法,其中所说的第1、第2和第3次所说抗体治疗有效量为约0.001mg/kg至约30mg/kg之间。
第八项,根据第六项的方法,其中所说第二次给药期是在所说第一次给药期的约7天内。
第九项,根据第六项的方法,其中所说第三次给药期是在所说第一次给药期的约14天内。
第十项,根据第六项的方法,其中所说的抗体衍生自TCAE8中含抗-CD20的转染瘤(ATCC贮存号69119)。
第十一项,免疫活性嵌合抗-CD20,它从含有TCAE8中的抗-CD20(ATCC保藏号69119)的转染瘤产生。
第十二项,分泌抗-CD20抗体的杂交瘤,所说杂交瘤是美国典型培养物保藏中心保藏号为HB11388的微生物。
第十三项,从第十二项的杂交瘤分泌的单克隆抗体。
第十四项,根据第十二项的放射性标记抗体。
第十五项,根据第十四项的放射性标记抗体,其中的放射性标记物选自钇[90],铟[111]及碘[131]所组成的一组之中。
第十六项,治疗B细胞淋巴瘤的方法,包括给人施用治疗有效量的第十四项的抗体。
第十七项,根据第十六项的方法,其中所说抗体的放射性标记物是钇[90]。
第十八项,治疗B细胞淋巴瘤的方法,包括下述步骤:
1)在第一次给药期,给人施用免疫活性嵌合抗-CD20抗体;及
2)在第二次给药期,给人施用放射性标记抗-CD20抗体。
第十九项,根据第十八项的方法,其中嵌合抗-CD20,衍生自TCAE8中的抗-CD20的转染瘤,该抗-CD20贮存于美国典型培养物收藏中心,是ATCC贮存号69119的微生物的一部分。
第二十项,根据第八项的方法,其中所说放射性标记抗体含由杂交瘤 分泌的单克隆抗体,该杂交瘤是美国典型培养物收藏中心贮存号为HB11388的微生物的等同物。
对附图的简要说明:
图1是适用于生产免疫活性嵌合抗-CD20抗体(TCAE8)的串联嵌合抗体表达载体的图示。
图2A至2F是图1载体的核酸序列;
图3A至3F是图1载体的核酸序列,该序列进一步含鼠轻链和重链可变区(TCAE8中的抗-CD20);
图4是来自鼠抗-CD20单克隆抗体2B8的鼠可变区轻链的核酸及氨基酸序列(包括CDR和构架区);
图5是来自鼠抗-CD20单克隆抗体2B8的鼠可变区重链的核酸及氨基酸序列(包括CDR和构架区);
图6是证明萤光标记人C1q与嵌合抗-CD20抗体结合的流式细胞计数结果,包括作为对照的标记C1q,标记C1q与鼠抗-CD20单克隆抗体2B8,以及标记C1q与人IgGl,k;
图7表示嵌合抗-CD20抗体和鼠抗-CD20单克隆抗体2B8相比较的补体相关的溶胞结果;
图8表示嵌合抗-CD20抗体和2B8相比对体内人效应细胞的抗体介导的细胞毒性结果;
图9A,9B和9C给出分别输注免疫活性嵌合抗-CD20抗体0.4mg/kg(A),1.6mg/kg(B),及6.4mg/kg(C)之后,非人灵长类外周血B淋巴细胞消耗的结果;
图10给出输注0.01mg/kg免疫活性嵌合抗-CD20抗体后,非人灵长类外周血B淋巴细胞消耗的特别结果;
图11给出在使用B细胞成淋巴肿瘤的小鼠体异物记录模式中Y2B8产生的杀肿瘤结果;
图12给出在使用B细胞成淋巴肿瘤的小鼠体异物记录模式中,C2B2产生的杀肿瘤结果;
图13给出在使用B细胞成淋巴肿瘤的鼠体异物记录模式中,Y2B8和C2B8相结合所产生的杀肿瘤结果;
图14A和14B给出得自C2B8的I/II期临床分析的结果,表明患者B细胞群体随时间的消耗,证明病患部分缓解(14A)及病患轻度缓解(14B)。
一般来说,抗体由两轻链和两重链分子组成,这些链形成一个普通的Y型,轻链和重链共同构成Y的两臂,重链构成Y的下部。轻链和重链被分成结构和功能同源区。轻链(VL)和重链(VH)二者的可变区决定了识别能力和特异性。轻链(CL)和重链(CH)的不变区赋于其重要的生物学性质,例如抗体链结合,分泌,经胎盘的流动性、Fc受体结合、补体结合等等。导致免疫球蛋白基因在产抗体细胞中表达的一系列活动是十分复杂的。可变区域基因序列位于不同种系基因片段(称之为“VH”“D”和“JH”或“VL”和“JL”。这些基因片段由DNA重排被连接形成在重链和轻链分别表达的完全V区域。该经重排连接的V片段(VL-JL和VH-D-JH)然后编码完全可变区或者分别编码轻链和重链的抗原结合区域。
使用抗-CD20鼠单克隆抗体(IF5)进行的人B细胞淋巴瘤的血清免疫疗法已由Press等人介绍过(69 Blood 584,1987,见上面),但遗憾的是据载其治疗反应只是暂时的。此外,据报道有25%的经试验的患者显示出对血清疗法的人抗鼠抗体(HAMA)反应。Press等人指出,这些抗体与毒素或放射性同位素结合,比起未结合的抗体来说,可产生更持久的临床效果。
由于B细胞淋巴瘤的效果衰减效应,并确实需要对付该疾病的可行治疗方法,我们已着手研究带有一种特殊抗体2B8(作为各方法之间的共同纽带)的不同的方法。一个这样的方法有益地利用了哺乳动物体系容易和有效地恢复外周血B细胞的能力;使用该方法,我们试图实际上消除或消耗外周血和淋巴组织中的B细胞,以作为除去B细胞淋巴瘤的手段。我们利用特殊的免疫活性嵌合抗-CD20抗体达到了这一目的。在另一个方法中,我们探索以放射性标记定靶肿瘤细胞使之破坏。
本文所使用术语“抗-CD20抗体”是特异性识别35000道尔顿的细胞表面非糖基化磷酸蛋白的抗体,该蛋白一般叫作人B淋巴细胞限制分化抗原Bp35,通常称之为CD20。本文所用术语“嵌合”,当针对抗-CD20抗体使用时,包括最优选的利用重组脱氧核糖核酸技术得到,并含人(包括免疫学相关物种例如黑猩猩)和非人成份的抗体;嵌合抗体的不变区最优选地基本上等同于天然人抗体的不变区;该嵌合抗体的可变区最优选地来源于非人源,且具有所需的对CD20细胞表面抗原的致免疫性和特异性。非人来源 可以是任何可用于产生抗人CD20细胞表面抗原的抗体的任何脊椎动物源,或含有人CD20细胞表面抗原的材料。此类非人来源包括(但不限于)啮齿动物(例如兔、大鼠、小鼠等等)和非人灵长类动物(例如Old World猴、猿等)。最优选的非人成分(可变区)来源于鼠类。当针对嵌合抗-CD20抗体时本文所用短语“免疫学活性”意指结合人Clq,介导人B淋巴样细胞系补体依赖性溶胞(CDC),并且通过抗体依赖性细胞毒性(ADCC)溶解人靶细胞的嵌合抗体。本文中所用短语“间接标记”和“间接标记法”意指螯合剂共价连接到抗体上,并且至少有一个放射性核素插入该螯合剂中。优选的螯合剂和放射性核素列举在Srivagtava S.C.和Mease,S.C.的“Progress in Researchon Ligands,Nuclides and Techniques for Laleling Monoclonal Antibodies”Nucl. Med.Bio.18/6:589-603(1991)(Srivagtava)一文中,该文引入本文作为参考。一种特别优选的螯合剂是1-异硫氰酸根合苯甲基-3-甲基二(1,2-亚乙基)三胺五乙酸(MX-DTPA);间接标记所用特别优选的放射性核素包括铟[111]和钇[90]。本文中所用短语“直接标记”和“直接标记法”意指放射性核素共价直接连接到抗体上(一般借助氨基酸残基)。优选的放射性核素在Srivagtava中提供;一种特别优选的用于直接标记的放射性核素是碘[131],借助酪氨酸残基共价连接。间接标记法特别优选。
本文所公开的治疗方法是基于灵长类动物免疫系统很快恢复或复原外周血B细胞的能力。此外,因为灵长类动物的基本免疫反应是由T细胞引起的,所以当免疫系统有外周血B细胞缺损时,不一定需要额外的预防措施(即隔离病人等)。由于灵长类动物免疫系统的以上这些及其它细微差别,我们的治疗B细胞紊乱的方法允许使用免疫活性嵌合抗-CD20抗体清除外周血B细胞。
根据定义,因为外周血B细胞紊乱可表明需要进入(access)血的治疗,所以免疫活性嵌合抗-CD20抗体和放射标记抗-CD20抗体的给药途径优选非肠道进行;本文使用的术语“非肠道”包括静脉、肌内、皮下、直肠、阴道或腹膜给药。这些给药方式中,最优选静脉给药。
免疫活性嵌合抗-CD20抗体及放射标记抗-CD20抗体一般由标准技术提供,将其加入药用可接受的缓冲剂,例如无菌盐水、无菌缓冲水、丙二醇,或上述缓冲液的混合物中给药。制备非肠道给药药剂的方法见 Pharmaceutical Carriers & Formulations,Martin Remington′s Pharmaceutical Sciences,15th Ed.(Mack Pub.Co.,Easton,PA1975)(引入本文作为参考)。
用于在任何给定患者中产生独特治疗效果的免疫学活性嵌合抗-CD20抗体的特定治疗有效量,可以由本领域普通技术人员熟知的标准技术来确定。
有效剂量(即治疗有效量)免疫活性嵌合抗-CD20抗体是约0.001-约30mg/kg体重,更优选约0.01-约25mg/kg体重,而最优选约0.4-约20.0mg/kg体重。其它剂量也可用;影响剂量的因素包括(但不限于)患病严重程度,以前用过的治疗方法,患者的总的健康状况,是否存在其它疾病等等。技术人员通过评估具体病人很容易确定落入上述范围内的适当剂量,假如需要,也可在该范围之外。
按这些剂量引入免疫活性嵌合抗-CD20抗体,可以以一次治疗完成,也可以以多次治疗完成。对于嵌合抗体来说,优选分多次治疗引入;优选方法由与该病相关的治疗方法来预测。虽然不希望受任何具体理论所束缚,但因为免疫活性嵌合抗-CD20抗体既具有免疫活性,又能与CD20结合,一旦开始引入该免疫活性嵌合抗-CD20抗体到个体中,则外周血B细胞消耗便开始了;我们观察到在治疗输注后24小时内几乎完全消耗掉。由此,该免疫活性嵌合抗-CD20抗体(或放射性标记抗-CD20抗体)随后引入(一次或多次)患者体内时,则可推定:a)消除保留的外周血B细胞;b)开始从淋巴节消耗B细胞;c)开始从其它组织源,例如骨髓、肿瘤等等消耗B细胞。当反复引入免疫活性嵌合抗-CD20抗体时再次表明,出现一系列现象,每种现象我们都认为对有效治疗疾病是很重要的。第一现象可以看作原则上针对基本上消耗患者的外周血B细胞;随后的各现象可认为是原则上针对同时或者分步从系统中清除剩余的B细胞,清除淋巴节B细胞,或清除其它组织B细胞。
实际上,虽然单剂量也提供效益,并能有效利用于病患治疗/控制,但优选的治疗过程可分几步进步;最优选将免疫活性嵌合抗-CD20抗体以约0.4-约20mg/kg体重,每周给患者施用一次,持续2-10个星期(最优选持续4星期左右)。
对于放射性标记抗-CD20抗体的使用来说,优选抗体是非嵌合的,该优选是根据与鼠抗体相比,嵌合抗体的循环半衰期明显要长些来预测出的(即由于循环半衰期较长时,放射性核素在患者体内存在时间增长)。但是, 如果相对于鼠抗体来说,与嵌合抗体相结合使用时,采用较低毫居里(mCi)剂量,则放射性标记抗体可以有益地施用。该情况使得在保持治疗效益的同时,骨髓毒性可降至能接受的水平。
不同的放射性核素都可用于本发明,相信本领域技术人员能很容易地决定哪种放射性核素在不同情况下是最为适合的。例如,碘[131]是已知用于定靶免疫治疗的放射性核素,但由于下述原因碘[131]的临床应用可能受到限制:8天的物理半衰期;在血液中和肿瘤部位碘化抗体都发生脱卤素作用;以及发射特性(例如大量γ成分),它可使肿瘤中的局部剂量积累处于次优化状况。
随着优良螯合剂的出现,将金属螯合基团连于蛋白上的可能性,提高了使用其它放射性核素(例如铟[111]和钇[90])的机会。钇[90]用于放射性免疫治疗有几个优点:它的64小时的半衰期足以使得抗体沉积于肿瘤周围,并且不像碘[131]之类,钇[90]是高能量的纯β发射源,其衰变时无γ射线相随,在组织中,它的作用范围为100-1000细胞直径。而且,它的射线穿透量极小,使得门诊病人可以施用钇[90]标记抗体。再有,标记抗体的内化对于杀死细胞来说并不需要,而离子化射线的局部发射对于无靶抗原的相邻肿瘤细胞来说应是致命的。
钇[90]的一种非治疗性限制是因为它缺乏明显的γ射线,使得以此造影很困难,为避免这一问题,在以钇[90]标记抗-CD20治疗给药之前,将诊断“造影”放射性核素(例如铟[111])用来测定肿瘤的位置和相对尺寸。铟[111]用作特别优选的诊断放射性核素,因为:在约1-约10mCi之间可安全给药无明显毒性;并且从其影像资料一般可预知随后的钇[90]标记抗体的分布。大部分造影研究采用5mCi铟[111]标记抗体,因为该剂量既安全又比起较低剂量来说提高了造影效果,在施用抗体之后3-6天出现最优影像。参见例如Murray,J.L.,26J.Nuc.Med.3328(1985)and Carraguillo,J.A.等人26 J.Nuc.Med.67(1985)。
钇[90]标记抗-CD20的有效单治疗剂量(即治疗学上有效量)在约5-约75mCi之间,更优选约10-约40mCi之间。碘[131]标记抗-CD20抗体的有效单治疗非骨髓剥离剂量在约5-约70mCi之间,更优选约5-约40mCi之间。碘[131]标记抗-CD20抗体的有效单治疗剥离剂量(即可以要求自体骨髓移植)在约30-约600mCi之间,更优选约5-小于500mCi。在与嵌合抗-CD20抗体 相结合时,由于比鼠抗体有较长的循环半衰期,碘[131]标记嵌合抗-CD20抗体的有效单治疗非骨髓剥离剂量在约5-约40mCi之间,更优选小于约30mCi。成像标准(例如对铟[111]标记物来说)一般小于约5mCi。
对于放射性标记抗-CD20抗体,其治疗可采用单次治疗法或多次治疗法。因为使用放射性核素成分,因此优选治疗之前,收集经受由放射性引起的潜在的致命骨髓毒性的病人的外周干细胞(PSC)或骨髓(BM),使用标准技术收集BM和/或PSC,为能够再输注将其净化和冷冻。此外,最优选治疗之前对病人进行使用诊断标记抗体(例如用铟[111])的诊断剂量测量法研究,其目的在于保证在任何正常器官或组织中,治疗标记抗体(例如使用钇[90])将不致于变得不必要的“过浓”。
已介绍过嵌合鼠-人抗体,例如见Morrison,S.L.et al.,PNAS 11:6851-6854(1984年11月);欧洲专利公开No.173494;Boulianne,G.L.et al., Nature 312:643(1984年12月);Neuleiger,M.S.et al.,Nature 314:268(1985年3月);欧洲专利公开No.125023;Tan et al.,J.Immunol.135:8564(1985年11月);Sun,L.K.et al.,Hybridoma5/1:517(1986);Sahagan et al.,J.Immunol.137:1066-1074(1986)。总的参见Muron,Nature 312:597(1984年12月);Dickson,Genetic Engineering News5/3(1985年3月);Marx,.Science 229:455(1985年8月);以及Morrison Science 229:1202-1209(1985年9月)。Robinsonet al.在PCT公开号WO88/04936中介绍了一种带有人不变区及鼠可变区的嵌合抗体,对CD20的一个抗原决定基有特异性。Robinson参考文献的嵌合抗体的鼠部分来源于2H7小鼠单克隆抗体(gamma2b,kappa)。虽然该文献指出所述嵌合抗体是治疗B细胞紊乱的“首选候选物”,但可以认为该论点只不过是一种建议,对本领域研究人员来说要确定该建议是否对该特定抗体来说是正确的,特别因为该文献缺乏任何支持治疗效果的数据,更重要的是缺乏使用高等哺乳动物例如灵长目或人所得到的数据。
产生嵌合抗体的方法本领域技术人员是已知的。例如,在不同的质粒中使用免疫球蛋白轻链和免疫球蛋白重链,其轻链和重链可以分开表达。然后可以将其提纯并于体外组装成完全的抗体。完成此种组装的方法已有人介绍过,见例如Scharff,M.,Harvey Lectures,69:125(1974)。从还原分离的轻链和重链形成IgG抗体的体外反应参数也已有人介绍过,例如见Beychok,S.Cells of Immunoglobulin Synthesis,Academic Press,New York,p. 69,1979。将重链和轻链在同样细胞中共表达使达到细胞内协同并将重链和轻链连接成完全的H2L2IgG抗体也是可能的。该共表达在相同宿主细胞中使用相同质粒,或者使用不同质粒均可行。
另一方法,即我们为形成嵌合非人/人抗-CD20抗体的最优选方法是基于使用包括(从头开始)来自人源的编码重链和轻链不变区的DNA的表达载体。该载体能插入编码非人可变区的DNA,以产生各种非人抗-CD20抗体,筛选并分析各种特性(例如结合特异性种类,抗原决定基结合区等等)。此后可将来自优选的或所需的抗-CD20抗体的编码轻链和重链可变区的cDNA掺入载体中。我们称这些类型的载体为串联嵌合抗体表达(TCAE)载体。一种最为优选的,被用于产生治疗淋巴瘤的免疫活性嵌合抗-CD20抗体的TCAE载体是TCAE8。TCAE8是本专利文件受让人所拥有的称作TCAE5.2的载体的衍生物,其区别在于TCAE5.2中显性可选择标志(新霉素磷酸转移酶“NEO”)的转译起始位点是一个一致Kozak序列,而TCAE8中,该区域是一个部分损伤的一致Kozak序列。有关TCAE载体(也称为ANEX载体)的显性可选择标志的起始位点对蛋白质表达的影响的详细内容已详细公开在本申请的共同未决申请中。
TCAE8包含四个(4)转录盒,这些按序串联,即无可变区的人免疫球蛋白轻链;无可变区的人免疫球蛋白重链;DHFR;以及NEO。每一转录盒包含其本身的真核生物启动子及多聚腺苷化区(参考图1,该图以图形表示TCAE8载体),特别是:
1)免疫球蛋白重链前面的CMV启动子/增强子是轻链前面的启动子/增强子,从-350位的Nhe I位点到-16位的Sst I位点的截短部分(见41Cell521,1985);
2)通过PCR反应由cDNA扩增衍生出人免疫球蛋白轻链不变区。在TCAE8中,这是人免疫球蛋白轻链K不变区(Kabat编号,氨基酸108-214,异型Km8(见Kabat,E.A.“Sequences of proteins of immunological interest”NIH Publication,Fifth Ed.No.91-3242,1991)),和人免疫球蛋白重链γ1不变区(Kabat编号氨基酸114-478,异型Gmla、Gmlz)。该轻链从正常人血中分离(IDEC Pharmaceuticals Corporation,La Jolla,CA);其RNA被用于合成cDNA,然后用PCR技术将其扩增(引物来自Kabat一致序列)。重链从以RNA制备的cDNA分离出(使用PCR技术),所述RNA则从以人IgGl载体(见, 3 Prot.Eng.531,1990;vector pNγ162)转染的细胞衍生的。在该分离人IgGl中有二个氨基酸被改变使之与来自Kabat的一致氨基酸序列相匹配,即氨基酸225由缬氨酸变为丙氨酸(GTT到GCA),而氨基酸287由蛋氨酸变为赖氨酸(ATG到AAG);
3)该人免疫球蛋白轻链和重链盒含有分泌免疫球蛋白链的合成信号序列;
4)该人免疫球蛋白轻链和重链盒含特异性DNA限制位点,该位点允许插入维持转换读码,并且不改变免疫球蛋白链中发现的正常氨基酸的轻链和重链免疫球蛋白可变区;
5)该DHFR盒包含其本身的真核生物启动子(小鼠β球蛋白主启动子,“BETA”)及多聚腺苷化区域(牛生长激素多聚腺苷化区,“BGH”);以及
6)该NEO盒含其本身的真核生物启动子及多聚腺苷化区域(SV40早期多聚腺苷化区“SV”)。
就TCAE8载体和NEO盒来说,该Kozak区是部分损伤的一致Kozak序列(它包括一上游Cla I位点):
Cla I -3 +1
GGGAGCTTGG ATCGAT ccTct ATG Gtt
(在TCAE5.2载体中,该变化是在ClaI和ATG区之间,即ccAcc。)
TCAE8的完全序列表(包括四个转录盒的特异成分)列于图2中(SEQ.ID NO.1)。
正如将被本领域技术人员所认识的,TCAE载体在生产免疫活性嵌合抗-CD20抗体时有益于大大缩短时间。生产和分离非人轻链和重链可变区,接着将其掺入人轻链不变转录盒及人重链不变转录盒中,使其生产出免疫活性嵌合抗-CD20抗体。
使用鼠源及杂交瘤技术,我们衍生出最优选的,对CD20抗原具特异性的非人可变区。使用聚合酶链反应(PCR)技术,该鼠轻链和重链可变区被直接克隆进TCAE8载体-这是将非人可变区掺进TCAE载体的最优选途径。该优选方法主要是根据PCR反应的效力及插入的精确性来预测出的。但是其它完成该目的的等同方法也是可采用的。例如使用TCAE8(或等同载体)可获得非人抗-CD20抗体的可变区序列,接着合成序列各部分的寡核苷酸,如果适合合成整个序列,然后,将整个合成序列的各部分插入载体的 适当位置。相信本领域技术人员能完成该工作。
我们的最优选免疫活性嵌合抗-CD20抗体,从使用包括来自单克隆抗-CD20抗体的鼠可变区的TCAE8载体衍生而来;该抗体(下面将详细讨论)称为“2B8”。在TCAE8从2B8(TCAE8中的抗-CD20)所获得的可变区完全序列列在图3中(SEQ.ID.NO.2)。
用于蛋白表达的宿主细胞系最优选哺乳动物源;相信本领域的技术人员有能力优选决定最适合于表达本文所需基因产物的具体宿主细胞系。典型的宿主细胞系包括(但不限于)DG44和DUXB11(中国仓鼠卵巢细胞系,DHFR-),HELA(人宫颈癌),CVI(猴肾细胞系),COS(带有SV40T抗原的CVI衍生物),R1610(中国仓鼠成纤维细胞),BALBC/3T3(小鼠成纤维细胞),HAK(仓鼠肾细胞系),SP2/0(小鼠骨髓瘤),P3x63-Ag3.653(小鼠骨髓瘤),BFA-lclBPT(牛内皮细胞),RAJI(人淋巴细胞)以及293(人肾)。宿主细胞系一般可从市场购得,从美国组织培养收藏中心或从公开的文献索取。
优选的宿主细胞系是DG44(CHO)或SP2/0,分别参见Urland,G.et al.,“Effect of gamma rays and the dihydrofolate reductase locus:deletions andinversions”Som.Cell & Mol.Gen.12/6:555-566(1986)和Shulman,M.et al.,“A better cell line for making hybridomas secreting specific antibodies.”Nature276:269(1978)。最优选的细胞系是DG44。可利用本领域任何现有技术来将质粒转染进宿主细胞。这些方法包括(但不限于)转染(包括电泳及电穿孔)、与包膜DNA细胞融合、微注射及以完整病毒感染。参见Ridgway,A.A.G.“Mammalian Expression vectors”Chapter24.2,pp.470-472Vectors,Rodriguezand Denhardt,Eds.(Butterworths,Boston,MA1988)。最优选的质粒引入宿主中的方法是借助电穿孔。
实施例
下述实施例不试图(也不构成)对本发明的限制。这些实施例试图说明:使用放射性标记抗-CD20抗体(I2B8)剂量造影;放射性标记抗-CD20抗体(Y2B8);及利用特定载体(TCAE8)和来自鼠抗-CD20单克隆抗体(2B8)的可变区衍生的免疫活性嵌合抗-CD20抗体(C2B8)。
I.放射性标记抗-CD20抗体2B8
A.抗-CD20单克隆抗体(鼠)的生产(2B8)
用人成淋巴细胞样细胞系SB给BALB/C小鼠反复接种(见Adams,R.A. et al.,“Direct implantation and serial transplantation of human acutelymphoblastic leukemia in hamsters,SB-2”Can.Res.28:1121-1125(1968);该细胞系可取自美国组织培养物收藏中心,Rockville,MD.其保藏号为ATCCCCL 120),于3-4个月内每周注射一次。正如由已知CD20-特异性抗体的抑制作用所测定的(所用抗-CD20抗体是Leu 16,Beckton Dickinson,San Jose,CA,Cat.NO.7670;和B1 Coulter Corp.,Hialeah.FL.Cat.NO.6602201),鉴定出表现出高抗-CD20抗体血清效价的小鼠。然后移除该鼠脾脏。按照Einfeld,D.A.et al(1988 EMBO 7:711)所述方法,将脾细胞与小鼠骨髓瘤SP2/0相融合(SP2/0在ATCC的保藏号为ATCC CRL 8006)。
用放射免疫测试法测试CD20的特异性,简要说来,使用Valentine,M.A.等人(1989)在J.Biol.Chem.264:11282所述的碘珠法以I125放射标记经提纯的抗-CD20B1(I125碘化钠ICN.Irvine,CA.Cat No.28665H)。通过来自各融合孔的0.05ml培养基与1%BSA,PBS(pH7.4)中的0.05ml I125标记抗-CD20B1(10ng)和含100,000SB细胞的0.5ml相同缓冲液一起共保温来筛选杂交瘤。室温下保温1小时之后,将细胞转移到96孔滴定平板上(V&PScientific,San Diego,CA)来收集细胞并彻底洗涤。含未标记抗-CD20B1的平行孔和不含抑制抗体的孔分别作为阳性和阴性对照。将含大于50%抑制作用的孔放大并克隆。表现出最高抑制作用的抗体来自本文称作“2B8”的克隆细胞系。
B.2B8-MX-DTPA结合物的制备
i.MX-DTPA
碳-14-标记的1-异硫氰酸根合苯甲基-3-甲基二(1,2-亚乙基)三胺五乙酸(碳-14标记MX-DTPA)用作将放射性标记连接到2B8上的螯合剂。操作MX-DTPA要保持在无金属条件下进行,即要采用无金属试剂,若可能,同时采用Alconox洗涤,并用Milli-Q水漂洗的聚丙烯塑料容器(烧瓶、烧杯、量筒、移液管)。从Dr.Otto Gansow处获得干燥固态MX-DTPA(NationalInstitue of Health,Bethesda,MD)并于4℃干燥贮存(避光),按2-5mM浓度在Milli-Q水中配制原液,于-70℃贮存。也从Coulter Immunology(HialeahFlorida)获得MX-DTPA的二钠盐水溶液并于-70℃贮存。
ii.制备2B8
采用以CENTRICON30TM旋转过滤器(30000D,MWCO;Amicon)反复缓 冲交换的方法,将抗体转移到无金属的含150mM NaCl的50mM二羟乙基甘氨酸-NaOff(pH8.6)中来制备供与MX-DTPA连接用的纯化2B8。一般是将50-200μl蛋白质(10mg/nl)加入到过滤元件中,接着加入2ml二羟乙基甘氨酸缓冲液。于4℃,在Sorval SS-34转子中上(6000rpm,45min)将过滤器离心处理,保留液体积约50-100μl。使用同样过滤器将该过程重复二次,将保留液转移到聚丙烯1.5ml螺丝帽试管中检测蛋白质,稀释至10.0mg/ml并于4℃贮存直到使用。将蛋白质同样使用前述方法转移到含150mM NaCl和0.05%叠氮钠的50mM柠檬酸钠(pH5.5)中。
iii.2B8与MX-DTPA的连接
于室温下在聚丙烯试管中将2B8与MX-DTPA连接。冷冻的MX-DTPA原液临使用前再解冻。按MX-DTPA对2B8的摩尔比为4:1的比例,将10mg/ml的蛋白质50-200ml与MX-DTPA反应。加入MX-DTPA原液并慢慢搅拌混合物,反应便开始,该连接过程于室温下过夜进行(14-20小时)。通过渗析或反复超滤将未反应的MX-DTPA从连接物中移至(如实施例I.B.ii所述)无金属含0.05%叠氮钠的生理盐水(0.9%w/v)中。将蛋白质浓度调节到10mg/ml并在聚丙烯试管中于4℃贮存直至放射标记。
iv.测定MX-DTPA掺入量
用闪烁计数法测定MX-DTPA掺入量,将从纯化连接物所得结果与碳[14]标记的MX-DTPA的比活进行比较。对于某些使用非放射性MX-DTPA(Coulter Immunology)的研究,则将连接物与已知浓度和比活的过量钇[90]放射性载体溶液一起培养来测定MX-DTPA的掺入量。
已知浓度的氯化钇原液以加入无载体钇[90](氯化物盐)的无金属0.05NHCl来配制。将该溶液的等分样以闪烁计数分析测定该试剂的精确比活性。将相当于预期将连接到抗体上的螯合物摩尔数的三倍量的氯化钇试剂(一般为2mol/mol抗体)加入到聚丙烯试管中,并用2M乙酸钠调节pH到4.0-4.5。然后将连接抗体加入并于室温下保温15-30分钟。加入20mM EDTA至终浓度为1mM来使反应骤冷,并将溶液pH值用2M乙酸钠调节到约6。
保温5分钟后,将整个内容物用高效排阻色谱(见下文)进行纯化,将洗脱出的含蛋白质级分合并,测定蛋白质浓度,并以等分样测定放射性。用氯化钇[90]制剂的比活性及蛋白质浓度来计算出螯合物的掺入量。
v.2B8-MX-DTPA的免疫活性
使用整细胞ELISA测定连接2B8的免疫活性。通过离心收集培养物中的对数中期的SB细胞,并用1X HBSS洗涤二次。将细胞在HBSS中稀释至1-2×106个细胞/ml,并按50,000-100,000个细胞/孔将其等分进96孔聚苯乙烯微滴平板上。将该板真空干燥2小时(40-50℃)使细胞固定于塑料上,这些板于-20℃贮存干燥直至使用,检测时,临使用才将板加热至室温,然后用含1%BSA pH7.2-7.4的1X PBS封闭(2小时)。将检测样品在1X PBS/1%BSA中稀释,施于板上并以同样缓冲液连续稀释(1:2)。于室温下将板保温1小时。用1X PBS洗板三次。将第二抗体(山羊抗小鼠IgGl-特异性HRP结合物50μl)加入各孔中(在1X PBS/1%BSA中按1:1500稀释)并于室温下保温1小时。用1X BPS洗板4次,接着加入ABTS底物溶液(50mM柠檬酸钠,含0.01%ATBS及0.001%H2O2,pH4.5)。保温15-30分钟后在405nm波长处测定该板,在检测试验中包括抗原阴性HSB细胞以检测非特异性结合。将吸收率值分别对稀释倍数作图,并将其与在同样板上使用天然抗体试验所获值(代表100%免疫活性)相比较计算出连接物的免疫活性,在滴定图的线性部分上取几个值进行比较并测出平均值(数据未显示出)。
vi.制备铟[111]标记的2B8-MX-DTPA(I2B8)
将连接物用无载体铟[111]放射标记。将0.05M HCl中的同位素(0.1-2mCi/mg抗体)等分样移进聚丙烯管中并加入约十分之一体积的无金属2M HCl。保温5分钟后,加入无金属2M乙酸钠调节pH到4.0-4.4。加入从在生理盐水或含0.05%叠氮钠的50mM柠檬酸钠/150mM NaCl中的10.0mg/ml DTPA的原液来源的约0.5mg2B8-MX-DTPA,立即将混合物轻轻搅拌。用pH试纸检查溶液的pH值,证实该值在4.0-4.5之间,并将混合物于室温保温15-30分钟。然后加入20mM EDTA至终浓度为1mM而使反应停止,再用2M乙酸钠将反应混合物调节到约为pH6.0。
保温5-10分钟后,将未结合的放射同位素用排阻色谱除去。HPLC单元由Waters Model6000或TosoHaas Model TSK-6110溶剂传输体系分别配以Waters U6K或Rheodyne700注射阀组成。使用凝胶渗透柱(BioRadSEC-250;7.5×300mm或相近的TosoHaas柱)和SEC-250防护柱(7.5×100mm)来进行色谱分离。该体系并装有级分收集器(Pharmacia Frac200)及配有280nm滤光器的UV检测器(Pharmacia ModelUV-1)。将样品上样,并以1.0ml/min的流动速度,用1×PBS(pH7.4)匀速洗脱。收集半毫升各级分在 玻璃试管中,并将这些等分样在γ计数器上计数。将低窗及高窗分别定于100和500KeV。
将相应于洗脱出的蛋白峰的放射活性相加,用从柱中洗脱出的总放射性来除该数,来计算出放射性掺入量,该值表达为百分数(未列出数据)。在某些情况下,可用瞬息薄层色谱(ITLC)来测定放射性掺入量。将放射性标记的连接物用1X PBS或1X PBS/1mM DTPA以1:10或1:20比例加以稀释,然后将其1μl点在距1×5cm ITLC SG纸条的一端1.5cm处,使用10%乙酸铵甲醇液:水(1:1v/v)进行上行色谱使纸展开。将该纸条干燥,从中部横切开,用γ计数法测定相应各部分的放射活性。将与纸条下半部相对应的放射活性(与蛋白质结合放射活性)以总的放射性的百分数表示,该总放射活性系将上下两半的值相加而得(数据未列出)。
通过测量放射性标记连接物的适当等分样的放射性来测定比活性,该值对计数器效率(一般75%)进行校正,并与前面利用280nm波长处的吸收率所测的连接物蛋白质浓度相关,该结果值表达为mCi/mg蛋白。
在某些实验中,采用相似于上面所述方法但不用HPLC提纯来用铟[111]放射性标记2B8-MX-DTPA,该方法称之为“混合速标”法(mix-and-shoot)。
vii.制备钇[90]标记的2B8-MX-DTPA(Y2B8)
遵循已介绍过的制备I2B8相同的方法用以制备钇[90]标记的2B8-MX-DTPA(Y2B8)连接物,不同的是未采用2ng HCl;如上所述,所用钇标记连接物制剂均用排阻色谱提纯。
C.非人动物研究
I.放射性标记2B8-MX-DTPA的生物学分布
以6-8周龄的BALB/C小鼠进行I2B8的组织生物学分布评定。按照上述“混合速标”法,使用临床级2B8-MX-DTPA制备放射性标记连接物。该连接物的比活是2.3mCi/mg,并将该连接物在含50mg/ml HSA的PBS(pH7.4)中配制。用100μl I2B8(约21μCi)给小鼠静脉注射,将三只一组的各组小鼠于0、24、48及72小时以颈离位的方式杀死。杀死之后将尾、心脏、肺、肝、肾、脾、肌肉及大腿取下,洗涤并称重;并将血液样品取出用于分析。由γ计数法测定相应各样品的放射性,并且随后测定出每克组织所注射剂量的百分比。未扣除各器官所带的血液所代表的活性量。
另一个不同的方法是,分别将于4℃和30℃保温10星期的 2B8-MX-DTPA等分样用铟[111]标记,使二制剂中比活为2.1mCi/mg。然后按上述方法研究这些连接物在小鼠体内的生物学分布。
对于剂量测定法测定来说,是用铟[111]标记2B8-MX-DTPA,使其比活达2.3mCi/mg,以约1.1μCi量注射入20只BALB/C小鼠的各鼠体内。然后分别于1、24、48及72小时将5只一组的各组鼠杀死,将其器官取出准备用于分析。此外,也将皮肤,肌肉和骨各部分取出并处理以进行分析;也于24-72小时各时间点收集尿和粪便加以分析。
使用相似方法,用钇[90]放射标记2B8-MX-DTPA,并在BALB/C小鼠体内评估72小时期间其生物学分布。用HPLC排阻色谱提纯之后,用约1μCi的临床配制连接物(比活为12.2mCi/mg),给五只一组的四组鼠分别进行静脉注射。然后于1、24、48及72小时将各组分别杀死,按上面所述分析其器官及组织。通过用γ闪烁计数器测量其轫致放射能量,从而测量相应各组织样品的放射活性,然后将活性值表达为每克组织注射剂量的百分数或每器官注射剂量的百分数。因为各器官及其它组织经反复漂洗除去了表面血液,这样各器官不充盈血液,因此各器官活性值未减去内部所带的血液所代表的活性分布。
ii.I2B8的肿瘤定位
在患Ramos B细胞肿瘤的无胸腺小鼠体内测定放射标记2B8-MX-DTPA的定位作用。用含有1.2×107Ramos肿瘤细胞的0.1mlRPMI-1640,经皮下注射(左后胁)给予6-8周龄的无胸腺小鼠,所说肿瘤细胞事先适应在无胸腺小鼠体内生长。两星期中肿瘤长出,其重从0.07至1.1g。然后用100μl铟[111]标记2B8-MX-DTPA(16.7μCi)给鼠静脉注射,并将三只一组的各组鼠分别于0、24、48及72小时以断颈方式杀死。杀死之后,取出尾、心、肺、肝、肾、脾、肌肉、大腿及肿瘤,洗涤并称重,也取出血液样品用于分析。用γ计数法测定相应各样品的放射活性,并算出每克组织所注射剂量的百分数。
iii.用放射性标记2B8-MX-DTPA进行生物学分布和肿瘤定位研究
遵循上述(实施例I.B.Viii.a)初步生物学分布实验,用铟[111]放射标记连接物2B8,使其比活性达2.3mCi/mg,将约1.1μCi注射入20只BALB/C小鼠的各只,测定放射性标记物的生物学分布。随后于1、24、48及72小时分别杀死五只一组的各组鼠,然后将其各器官及部分皮肤、肌内及骨取出 并处理以进行分析。此外,在24-72小时各时间点也收集尿及粪便加以分析。血中的放射性水平从1小时时所占每克注射剂量的40.3%降至72小时时的18.9%(未列出数据)。而整个实验中,心、肾、肌肉和脾各值则保持在0.7-9.8%的范围内。肺中的放射性水平发现从1小时时的14.2%降至72小时时的7.6%。而相似的肝每克注射剂量值分别为10.3%和9.9%。这些数据如下述用于测定放射吸收剂量估算I2B8。
在BALB/C小鼠体内评估比活为12.2mCi/mg抗体的钇[90]标记连接物的生物学分布。放射性掺入达>90%,并用HPLC提纯该放射性标记的抗体。72小时内评估主要器官及皮肤、肌肉、骨、以及尿和粪便中的放射性的组织积沉,并表达为注射剂量/g组织的百分数。结果(未列出)表明,相应于血液的放射性水平从1小时时的每克注射剂量的约39.2%降至72小时时的约15.4%,而相应于尾、心、肾、肌肉及脾的放射性水平,在整个实验过程中却大致保持10.2%不变或稍小。重要的是相应于骨的放射性是在1小时时的每克注射剂量的4.4%至72小时时的3.2%范围内。总的来说,这些结果表明该连接物中很少有游离钇与之共存,在研究过程中很少有游离放射性金属释放出。这些数据将如下述用于测定放射吸收剂量估算Y2B8。
制备2B8-MX-DTPA并用铟[111]标记,使其比活达2.7mCi/mg,用于肿瘤定位研究。然后给12只患Ramos B细胞肿瘤的无胸腺小鼠每只注射100μl标记的连接物(约24μCi)。肿瘤重量为0.1-1.0g范围。注射后的第0、24、48及72小时各时间点,通过后眼窝穿刺抽取50μl血,断颈杀死鼠,将尾、心、肺、肝、肾、脾、大腿及肿瘤取出,将组织处理并称重,使用γ计数器测定相应于各组织样品的放射性,将其值表达为每克所注射剂量的百分数。
结果(未列出)证明铟[111]2B8-MX-DTPA在肿瘤中的浓度在整个实验过程中稳定增加。72小时之后注射剂量的13%沉积在肿瘤中。相反的在血液中的水平,在实验过程中由零小时时的超过30%降至72小时时的13%。实验结束时,所有其它组织(除肌肉外)含每克组织的注射剂量的1.3%至6.0%之间;肌肉组织含有每克的注射剂量的约13%。
D.人类研究
i.2B8和2B8-MX-DTPA:用人组织作免疫组织学研究
使用一组用丙酮固定的32种不同人组织来评价鼠单克隆抗体2B8的组 织反应活性。抗体2B8与具高度限制性组织分布形式的抗-CD20抗原反应,该组织分布形式仅在淋巴样组织(包括造血源的组织)中的细胞亚群中观察到。
在淋巴节中,免疫活性在成熟外皮B-淋巴细胞群体以及胚层中心繁殖细胞中观察到。阳性反应也在外周血,扁桃体B细胞面、脾的白髓以及胸腺中发现的40-70%髓质淋巴细胞中观察到。阳性反应也在大肠的固有层的滤泡(Peyer氏斑)中看到。最后,聚集或散布于各种器官的基质中(这些器官包括膀胱、乳房、宫颈、食管、肺、腮腺、前列腺、小肠及胃)的淋巴样细胞与抗体2B8反应也是阳性的(数据未列出)。
发现所有简单的上皮细胞、以及分层的上皮及不同器官的上皮都不与之反应。同样,与神经外胚层细胞(包括脑,脊椎及外周神经的外胚层细胞)也不反应。间质元件,例如骨胳和平滑肌细胞、成纤维细胞、内皮细胞以及多形态核炎性细胞也发现是阴性的(未列出数据)。
使用用丙酮固定的一组16种不同人组织来评价2B8-MX-DTPA连接物组织反应活性。正如前面用天然抗体所证明的(未列出数据),该2B8-MX-DTPA连接物也识别表现出高度限制性分布形式的CD20抗原,该分布形式仅在淋巴样来源细胞亚群中发现。在淋巴节中,免疫活性在B细胞群体中观察到。在脾的白髓及胸腺髓质淋巴细胞中发现很强反应活性。在膀胱、心脏、大肠、肝、肺及子宫中散布的淋巴细胞中也观察到免疫活性,这归结于这些组织中存在炎性细胞所致。正如与天然抗体一样,神经外胚层细胞或间质元件也未发现反应活性(未列出数据)。
ii.I2B8(造影)及Y2B8(治疗)的临床分析
a.I/II期临床试验单剂量治疗研究
现进行I/II期I2B8(造影)临床分析,接着进行Y2B8单剂量治疗临床分析。对单剂量研究,采用下述方案
1.收集外周干细胞(PSC)或骨髓(BM)并净化;
2.I2B8造影;
3.Y2B8治疗(三种剂量水平);及
4.PSC或自体BM移植(假如必要,则根据连续3天绝对中性白细胞计数低于500/mm3或血小板低于20000/mm3,同时骨髓检查时无骨髓复原迹象来决定)。
Y2B8的剂量水平如下:
剂量水平 剂量(mCi)
1 20
2 30
3 40
每个剂量水平用来治疗3个患者,以确定最大耐受剂量(MTD)。
造影(剂量测量法)研究进行如下:使用I2B8对每个患者进行二次体内生物学分布研究。第一次实验中,以1小时内静脉输注(i.v.)给药2mgI2B8(5mCi);一星期后由静脉给药2B8(即非连接抗体),其输入速率不超过250mg/hr,紧接着在1小时期间静脉给药2mg I2B8(5mCi)。在上述两次实验中I2B8输注之后立即给每个患者造影,在时间t=14-18小时(假如指明)、t=24小时、t=72小时及t=96小时(假如指明)重复造影。测定整个身体铟[111]标记的平均保留时间;也对可识别器官或肿瘤患部(有意义区域)作此种测定。
将这些有意义区域与整个身体的标记物浓度进行比较。根据该比较结果,使用标准方法可测定Y2B8的估计位置及浓度。假如Y2B8的估计累积剂量比估计的整个身体的剂量大8倍、或假如肝中的估计累积剂量超过1500cGy,那么不应以Y2B8来处理。
假如该造影研究可以接受,那么先按0.0或1.0mg/kg患者体重的2B8量,由静脉输注给药,其输入速率不超过250mg/小时。然后以20mCi/小时的速度静脉输注Y2B8(10、20或40mCi)给药。
b.I/II期临床试验:多剂量治疗研究
现进行Y2B8的I/II期临床分析,对于多剂量研究,按下述方案:
1.收集PSC或BM;
2.I2B8造影;
3.Y2B8治疗(三种剂量水平)采用4次剂量或者总累积剂量为80mCi;及
4.PSC或自体BM移植(根据医生的决定)
Y2B8的剂量水平如下:
剂量水平 剂量(mCi)
1 10
2 15
3 20
每个剂量水平治疗三个患者确定其MTD。
造影(剂量测量法)研究按如下进行:用头二个患者测定未标记抗体(即2B8)的优选造影剂量。四小时期间,这头两个患者将接受250CC生理盐水中的未标记2B8 100mg,接着给予0.5mCi I2B8。于时间t=0,t=10min,t=120min,t=24hr,t=48hr收集血样供生物学分布测定用。分别在t=2hr,t=24hr及t=48hr用多区域γ照相机摄取影象。在第48小时摄影后,给病人如上述输入250mg 2B8,接着给予4.5mCi I2B8,然后按上面所述取血及摄影。假如100mg 2B8产生优良影象,那么随后两个病人按上面所述给予50mg 2B8,接着给予0.5mCi I2B8,48小时后再给予100mg2B8,然后再给4.5mCi I2B8。假如250mg2B8产生优良影像,然后下两个病人将按上述给予250mg2B8,接着给予0.5mCi I2B8,48小时之后再给予500mg2B8并给予4.5mCi I2B8。后面的病人将以提供最优造影的最低量2B8处理。最优造影定义如下:(1)使抗体消失最慢的最有效造影;(2)在单一器官中分隔最小的最好分布状况;(3)患处的最佳主观分辨度(肿瘤/背景对比)。
对于前4个病人,Y2B8的第一次治疗剂量将在I2B8最后剂量后的第14天开始,而后面的病人Y2B8第一次治疗剂量将在I2B8后的2-7天开始。
用Y2B8治疗之前,除了前面的4个病人外其余的病人按上面所述给予2B8,接着静脉输注Y2B8(在5-10分钟期间输完)。在t=0分钟,t=10分钟,t=120分钟,t=24小时,t=48小时分别取血样用于生物学分布。约每6-8星期患者将收到重复Y2B8剂量(与第一次剂量相同的剂量给药)最多共4次,或总累计剂量80mCi。最优选患者的WBC大于或等于3000,且AGC大于或等于100,000之后再接受随后的Y2B8剂量。
三种剂量水平研究完成之后,将确定MTD值,然后其它的患者再进入研究,这些患者将接受MTD。
II.嵌合抗-CD20抗体的生产(C2B8)
A.嵌合抗-CD20免疫球蛋白DNA表达载体的构建
从2B8小鼠杂交瘤细胞分离出RNA(如Chomczynki,P.等人在“Singlestep method of RNA isolation by acid guanidiniumthiocyanate-phenol-chloroform extraction”Anal.Biochem.162:156-159(1987)中所述),并由此制备cDNA。通过聚合酶链反应,使用与小鼠轻链信号序 列5′端和小鼠轻链J区3′端同源的一套DNA引物,从cDNA中分离小鼠免疫球蛋白轻链可变区DNA。引物序列如下:
1.VL有意义(SEQ.ID.NO.3)
5′ATC AC AGATCT CTC ACC ATG GAT TTT CAG GTG CAG
ATT ATC AGC TTC 3′
(下面划线的部分是BglII位点;上面划线的部分是起始密码子)
2.VL反义(SEQ.ID.NO.4)
5′TGC AGC ATC CGTACG TTT GAT TTC CAG CTT 3′
(下面划线部分是Bsi WI位点)
TCAE8中的相应BglII和Bsi WI位点见图1和2,TCAE8中抗-CD20中的相应位点见图3。
将这些得到的DNA片段直接克隆进TCAE8载体中人kappa轻链不变区的前面并测序。所测定的鼠可变区轻链的DNA序列绘于图4中(SEQ.ID.NO.5),也见图3核苷酸978至1362。图4也提供来自该鼠可变区的氨基酸序列以及CDR和构架区。来自2B8的小鼠轻链可变区是小鼠kappa VI家族,见前面所述Kabat的文献。
按相似方法分离出小鼠重链可变区并克隆到人IgGl不变区之前。引物如下:
1.VL有意义(SEQ.ID.NO.6)
5′GCG GCT CCC ACGCGT GTC CTG TCC CAG 3′
(底下划线的部分是Mlu I位点)
2.VL反义(SEQ.ID.NO.7)
5′GG(G/C)TGT TGT GCTAGC TG(A/C)(A/G)GA GAC(G/A)GT GA 3′
(下面划线的部分是Nhe I位点)
TCAE8中的相应Mlu I和Nhe I位点见图1及图2,TCAE8中抗-CD20中的相应位点见图3。
该小鼠重链的序列绘于图5(SEQ.ID.NO.8),也参见图3,核苷酸2401至2820。图5也提供来自该鼠可变区的氨基酸序列以及CDR和构架区。来自2B8的小鼠重链可变区是小鼠VH2B家族,见前面所述Kabat的文献。
B.创建产生嵌合抗-CD20的CHO和SP2/0转染瘤
将中国仓鼠卵(CHO)细胞DG44于减次黄嘌呤和胸苷的SSFM II培养基 (Gibco,Grand Island,NY,Form No.910456PK)中培养;而将SP2/0小鼠骨髓瘤细胞在Dulbecco氏改良伊格尔培养基(DMEM)(Irvine Scientific,Santa Ana,Ca.,Cat.No.9024)并加有5%胎牛血清及20ml/l谷氨酰胺的培养基中培养。使用BTX600电穿孔体系(BTX.San Diego.CA)在0.4ml一次性电穿孔池中,以由Not I所限制过的25μg CHO或50μg SP2/0质粒DNA将4百万细胞电穿孔,条件是CHO用210伏,SP2/0用180伏,400微法,13欧姆。各电穿孔物铺于6个96孔的平皿(约7000个细胞/孔)上。各平皿加以含G418(GENETICIN,Gibco,Cat.No.860-1811)的培养基,其加入方式是对于CHO来说,以400μg/ml活性化合物比例(培养基中还包括50μM次黄嘌呤和8μM胸苷)加入,或对SP2/0来说按800μg/ml加入,于电穿孔后两天加入,此后2或3天加一次直至菌落产生为止。将菌落的上清液用对人抗体特异性的ELISA来检测其嵌合免疫球蛋白的存在。将产生最高量免疫球蛋白的菌落展开,并铺于含加氨甲蝶呤(25nM为SP2/0,5nM为CHO)的培养基的96孔平板上。2-3天添加一次。按上面所述检测上清液并检查产生最大量免疫球蛋白的菌落。使用蛋白A亲和色谱将嵌合抗-CD20抗体从上清液中提纯。
采用聚丙烯酰胺电泳法分析提纯的嵌合抗-CD20,并估计纯度超过95%。根据2B8确定嵌合抗体的亲和性及特异性。以直接和竞争结合测试法试验嵌合抗-CD20抗体,与鼠抗-CD20单克隆抗体2B8相比,证明对许多CD20阳性B细胞系有差不多的亲合性及特异性(数据未列出)。通过I125放射标记嵌合抗-CD20直接结合来测定嵌合抗体的表观亲和常数(Kap)并且以Scatchard作图法来与放射性标记2B8相比较。估测出的CHO产生的嵌合抗-CD20的Kap是5.2×10-9M,而SP2/0产生的抗体为7.4×10-9M,2B8估测的Kap是3.5×10-9M。放射免疫测试的直接竞争用来通过比较其与2B8有效竞争的能力确认嵌合抗体的免疫活性的特异性及保留程度。产生对B细胞上CD20抗原结合作用50%抑制作用所需的嵌合抗-CD20和2B8抗体的量基本相等(数据未列出),即设想由于嵌合作用所引起的抗-CD20抗体的抑制活性损失极小。
实施例II.B的结果特别表明,使用TCAE8载体从CHO和SP2/0转染瘤产生嵌合抗-CD20抗体,该嵌合抗体基本上与鼠抗-CD20单克隆抗体2B8有相同的特异性和结合能力。
C.嵌合抗-CD20抗体的免疫活性测试
i.人Clq分析
以流式细胞计数测试法,使用萤光素标记Clq(Clq从Quidel,Mira Mesa,CA.Prod.No.A400获得,而FITC标记从Sigma,St.Louis MO,Prod.No.F-7250获得,按照Selected Methods In Cellular Immunology,Michell&Shiigi,Ed.(W.H.Freeman & Co.San Francisco,CA,1980,p.292)一书所述方法进行C1q的FITC标记)来评价由CHO和SP2/0细胞系产生的嵌合抗-CD20抗体对人C1q的结合作用。使用Becton Dickinson FACScanTM流式细胞计数器(在515-545nm范围内测量萤光素)来得到分析结果。相等量的嵌合抗-CD20抗体,人IgGl,K骨髓瘤蛋白(Binding site,San Diego,Ca,Prod.No.BP078)和2B8与相当数量的CD20-阳性SB细胞共培养,接着用FACS缓冲液(.2%BSA于PSA中,pH7.4,.02%叠氮钠)洗涤,除去未连接的抗体,接着与FITC标记的C1q一起培养,保温30-60分钟之后,再次洗涤细胞。用FACScanTM,遵循厂商的说明对三种条件(包括FITC标记Clq作为对照)进行分析。结果绘于图6中。
正如图6所显示的,仅仅对于嵌合抗-CD20抗体条件才观察到显著的萤光增强,即仅仅与嵌合抗-CD20抗体结合的SB细胞才呈Clq阳性,而其它条件则得到与对照物相同的图形。
ii.补体依赖性细胞溶解
在人血清存在下(补体源)分析嵌合抗-CD20抗体溶解淋巴瘤细胞系的能力。于37℃,将100μCi51Cr与1×106SB细胞混合1小时,由此以51Cr标记CD20阳性SB细胞。然后在相等量的人补体及相当量的(0-50μg/ml)嵌合抗-CD20抗体或2B8存在下,于37℃,将标记SB细胞培养4小时(见Brunner,K.T.et al.,“Quantitative assay of the lytic action of immune lymphoidcells on 51Cr-labeled allogeneic target cells in vitro”Immunology14:181-189(1968)),结果绘于图7。
图7的结果特别表明,在这些条件下,嵌合抗-CD20抗体产生显著溶胞作用(49%)。
iii.抗体依赖性细胞毒性效应细胞检测
利用CD20阳性细胞(SB)和CD20阴性细胞(T细胞白血病系HSB,见Adams,Richard,“Formal Disussion”Can.Res.27:2479-2482(1967);ATCC保 藏号ATCC CCL 120.1)进行该项研究,该两细胞用51Cr标记。分析按照Brunner,K.T.et al.,“Quantitative assay of the lytic action of immune lymphoidcells on 51Cr-labeled allogeneic target cells in vitro;inhibition by isoantibodyand drugs.”Immunology14:181-189(1968)所述方法进行。于37℃保温4小时后,观察到CD20阳性SB靶细胞(51Cr-标记)的嵌合抗-CD20抗体依赖性细胞介导的显著的溶胞作用,并且该效果也由CHO和SP2/0产生的抗体所观察到(效应细胞是人外周淋巴细胞,效应细胞:靶的比例是100:1)。靶细胞的有效溶解于3.9μg/ml获得。相反的,在同样情况下,鼠抗-CD20单克隆抗体2B8从统计学上看无明显效果,而CD20阴性HSB细胞则不溶解。结果示于图8中。
实施例II的结果特别表明,实施例I的嵌合抗-CD20抗体具免疫学活性。
III.使用嵌合抗-CD20抗体体内消耗B细胞
A.非人灵长类动物研究
分别进行三个非人灵长类动物研究。为方便起见,这三个研究分别称之为“嵌合抗-CD20:CHO & SP2/0”,“嵌合抗-CD20:CHO”及“高剂量嵌合抗-CD20”,其条件如下:
嵌合抗-CD20:CHO & SP2/0
将6只体重在4.5到7公斤范围内的猕猴(White Sands Research Center,Alamogordo,NM)按2只一组分成三组。每组中的两个动物均给予相同剂量的免疫活性嵌合抗-CD20抗体,而每组一个动物给予CHO转染瘤产生的纯化抗体,另一个给予SP2/0转染瘤产生的抗体。三个组接受的抗体剂量相应为每天0.1mg/kg,0.4mg/kg及1.6mg/kg持续连续4天。该嵌合免疫活性抗-CD20抗体与无菌盐水混合,通过静脉输注给药,每次输注前取血样。另外在最后一次注射后开始的24小时(T=0)及此后的第1、3、7、14和28天均抽取血样,并且此后按二星期的间隔再抽血样直至第90天研究完成为止。
于2000RPM将约5ml来自各动物的全血离心5分钟。取出血浆用于检测可溶的嵌合抗-CD20抗体水平。其沉淀(含外周血白细胞和红血细胞)再悬浮于胎牛血清中用于萤光标记抗体分析(见“Fluorescent Antibody Labeling ofLymphoid Cell Population”如后面所述)。
嵌合抗-CD20:CHO
将6只体重4-6公斤的猕猴(White Sands)按2只一组分成三组,所有的动物均给注射从CHO转染瘤产生的免疫活性嵌合抗-CD20抗体(于无菌盐水中)。该三组再按下法分开:第一组每日静脉注射0.01mg/kg抗体持续4天;第二组每日静脉注射0.4mg/kg抗体持续4天;第三组单次静脉注射6.4mg/kg抗体。三个组均在治疗开始前抽取血样,此后于最后注射之后的T=0、1、3、7、14和28天如上所述分别抽血样,这些血样均都加工用于萤光标记抗体分析(见后面“Fluorescent Antibody Labeling”)。除进行外周血B细胞定量分析外,还在最后一次注射之后的第7、14及28天取淋巴节活检,并且为用流式细胞计数器进行淋巴细胞总数定量分析而作单细胞制剂染色。
高剂量嵌合抗-CD20
给2只猕猴(White Sands)每周输注16.8mg/kg从CHO转染瘤得到的免疫活性嵌合抗-CD20抗体(于无菌盐水中)持续连续4周。治疗结束时,将两动物麻醉取出骨髓,并取淋巴节活检。用Leu16将两份组织染色用流式细胞计数器测定B淋巴细胞的存在,此测定遵从Ling,N.R.等人的“B-cell andplasma cell antigens”Leucocyte Typing III White Cell Differentiations Antigens,A.J.McMichael,Ed.(Oxford University Press,Oxford UK1987)p.302所述方法进行。
淋巴样细胞总体的萤光抗体标记
除去血浆之后,用Hanks平衡盐溶液(HBSS)洗白细胞二次,并再悬浮于与血浆等体积的胎牛血清(56℃热失活30分钟)中。将该细胞制剂0.1ml体积分配于6支15ml圆锥形离心管的每支中。将对人淋巴细胞表面标志CD2(AMAC,Westbrook,ME),CD20(Becton Dickinson)及人IgM(Binding Site,San Diego,CA)具特异性的萤光素标记单克隆抗体加入到这些管的3支中,用以鉴定T和B淋巴细胞总数。所有的试剂预先试验过对相应的猴淋巴细胞抗原呈阳性。嵌合抗-CD20抗体与猴B细胞表面CD20的结合作用,在第4个管中使用与藻红素偶联的多克隆山羊抗-人IgG(AMAC)来测量。该试剂被预先吸附在猴Ig-琼脂糖柱上以阻斥对猴Ig的交叉反应活性,由此可进行连接于细胞的嵌合抗-CD20抗体的特异性检测并定量分析。第5支管既包含抗-IgM又包含抗-人IgG试剂用于B细胞群双染色。第6支管中的样品未加试剂用于测定自体萤光。将细胞与萤光抗体保温30分钟,用0.5ml固 定缓冲液(0.15M NaCl,1%多聚甲醛pH7.4)洗涤和固定,并在BectonDickinson FACScanTM仪上分析。淋巴细胞总数一开始由前右夹角光散射在点绘图上与未标记的白细胞一起鉴定出。然后排除所有其它的作用,分离出总淋巴细胞总数,随后的萤光测量值仅反映剩下的淋巴细胞特异性作用。外周血B淋巴细胞的消耗
虽然用CHO转染瘤衍生的嵌合抗-CD20抗体,以1.6mg/kg及6.4mg/kg的剂量水平给猴注射后7天,而用SP2/0产生的抗体以0.4mg/kg剂量水平给猴注射后7天,B细胞恢复开始稍增,但CHO及SP2/0产生的抗体之间在效力上没有看出有明显差别。图9A、B及C提供源于嵌合抗-CD20:CHO及SP2/0研究的结果,其中图9A针对0.4mg/kg剂量水平,图9B针对1.6mg/kg剂量水平,而图9C针对6.4mg/kg剂量水平。
正如图9所证明的,在所有试验过的剂量范围内,治疗处理之后,外周血B细胞水平出现急剧下降(>95%),并且这些水平保持到输注后7天,经过这一期间后,B细胞开始恢复,而开始恢复的时间与剂量水平无关。
在嵌合抗-CD20:CHO研究中,每日4次注射(共0.04mg/kg)期间,采用10倍较低抗体剂量浓度(0.01mg/kg)。图10给出这一研究结果,该剂量消耗外周血B细胞总数至正常水平的约50%(以抗-表面IgM或Leu16抗体估测)。该结果也表明,对非人灵长类动物来说,以免疫活性嵌合抗-CD20抗体在该剂量浓度,在该时间内,便使得CD20抗原在B淋巴细胞群体上达到饱和的情况不会出现,治疗处理之后最初3天内,在血样中检出抗体包被的B淋巴细胞,然而在第7天时,便检不出抗体包被细胞了。
表I归纳了单剂量或多剂量免疫活性嵌合抗-CD20抗体对外周血细胞总数影响的结果,单剂量条件是6.4mg/kg,多剂量条件是0.4mg/kg连续4天(这些结果来源于上面所述对猴的研究)。
表I
C2B8灵长类动物研究得出的外周血总数
猴 剂量 天数 CD2 抗-Hu IgG
A 0.4mg/kg 预先抽血 81.5 -
(4剂) 0 86.5 0.2
7 85.5 0.0
21 93.3 -
28 85.5 -
B 0.4mg/kg 预先抽血 81.7 -
(4剂) 0 94.6 0.1
7 92.2 0.1
21 84.9 -
28 84.1 -
C 6.4mg/kg 预先抽 77.7 0.0
(1剂) 7 85.7 0.1
21 86.7 -
28 76.7 -
D 6.4mg/kg 预先抽血 85.7 0.1
(1剂) 7 94.7 0.1
21 85.2 -
28 859 -
抗-Hu IgG+
猴 抗-Hu IgM * Leu-16 %B细胞消耗
A - 9.4 0
0.3 0.0 97
0.1 1.2 99
- 2.1 78
- 4.1 66
B - 14.8 0
0.2 0.1 99
0.1 0.1 99
- 6.9 53
- 8.7 41
C 0.2 17.0 0
0.1 0.0 99
- 14.7 15
- 8.1 62
D 0.1 14.4 0
0.2 0.0 99
- 9.2 46
- 6.7 53
*双染色总数,它表明嵌合抗-CD20包被B细胞的程度。
归纳于表I中的数据表明,不管单剂量或多剂量水平,在抗体过剩的情况下外周血中B细胞的消耗都很快且效果很好。此外,至少最后一次注射后7天都能观察到消耗作用,到21天时观察到部分B细胞恢复。
表II归纳采用表I的治疗制式(0.4mg/kg4次日剂量或6.4mg/kg1次)时,免疫活性嵌合抗-CD20对淋巴结中细胞总数的影响,也提供正常淋巴结(对照猴、腋下和腹股沟的)和正常骨髓(二只猴)的比较值。
表II
淋巴节的细胞总数分析
猴 剂量 天数 CD2 抗-Hu IgM
A 0.4mg/kg 7 66.9 -
(4剂) 14 76.9 19.6
28 61.6 19.7
B 0.4mg/kg 7 59.4 -
(4剂) 14 83.2 9.9
28 84.1 15.7
C 6.4mg/kg 7 75.5 -
(1剂) 14 74.1 17.9
28 66.9 23.1
D 6.4mg/kg 7 83.8 -
(1剂) 14 74.1 17.9
28 84.1 12.8
表II(续)
抗-Hu IgG+
猴 抗-Hu IgM * Leu-16 %B淋巴细胞消耗
A 7.4 40.1 1
0.8 22.6 44
- 26.0 36
B 29.9 52.2 0
0.7 14.5 64
- 14.6 64
C 22.3 35.2 13
1.1 23.9 41
- 21.4 47
D 12.5 19.7 51
0.2 8.7 78
- 12.9 68
表II(续)
抗-Hu IgG+ %B淋巴细胞
CD2 抗-Hu IgM 抗-Hu IgM Leu16 消耗
正常淋巴节
对照1
腋下 55.4 25.0 - 41.4 NA
腹股沟 52.1 31.2 - 39.5 NA
正常骨髓
对照2 65.3 19.0 - 11.4 NA
对照3 29.8 28.0 - 16.6 NA
表II的结果表明,两种治疗制式均有效地消耗掉B淋巴细胞。表II还表明,对于非人灵长类动物来说,使用免疫活性嵌合抗-CD20抗体,则B细胞在淋巴组织中的完全饱和状态不会达到。此外在治疗后第7天观察到抗体包被细胞,接着在第14天明显地观察到消耗掉淋巴结B细胞。
根据这些数据,进行上述单次高剂量嵌合抗-CD20研究,主要是测定药理学/毒理学。该研究用以评价随着嵌合抗体的给药所引起的毒性,以及B细胞从外周血淋巴结和骨髓中消耗的效力。此外,因为表II数据表明,在那些实验中淋巴结B细胞大部分在治疗后的7-14天消耗掉,因此可以证明采用周剂量制式会获更佳效果。表III归纳出高剂量嵌合抗-CD20研究的结果。
表III
淋巴结和骨髓的细胞总数分析淋巴细胞总数(%)
猴 CD2 CD20 a mIgM+抗-C2B8 b C2B8 c 天数 d
腹股沟淋巴节
E 90.0 5.3 4.8 6.5 22
F 91.0 6.3 5.6 6.3 22
G 89.9 5.0 3.7 5.8 36
H 85.4 12.3 1.7 1.8 36
骨髓
E 46.7 4.3 2.6 2.8 22
F 41.8 3.0 2.1 2.2 22
G 35.3 0.8 1.4 1.4 36
H 25.6 4.4 4.3 4.4 36
a表示以Leu16染色的总数。
b表示双染色总数,对表面IgM细胞和嵌合抗体包被的细胞均为阳性。
c表示对嵌合抗体[包括双染色表面IgM阳性细胞及单染色(表面IgM阴性)细胞]染色的总计数量。
d最后一次16.8mg/kg剂量注射后的天数。
被评价的两动物在治疗停止后第22天含有的B细胞少于5%,而对照的淋巴结中为40%(见上表II)。同样,在以嵌合抗-CD20抗体治疗的动物骨髓中,CD20阳性细胞水平小于3%,而正常动物为11-15%(见上表II)。被评价的动物在治疗停止后第36天,其中1只(H)在淋巴结中有约12%B细胞,在骨髓中有4.4%B细胞,而另外1只(G)的淋巴结中有约5%细胞,骨髓中有0.8%,该数据表明了显著的B细胞消耗作用。
实施例IIIA.的结果特别证明了低剂量免疫活性嵌合抗-CD20可产生长效灵长类动物体内的外周血B细胞消耗。这些数据也证明,当反复高剂量抗体给药时,在外周淋巴结和骨髓中也能引起B细胞总数的显著消耗。继续跟踪试验动物表明,即使在治疗的第一星期产生如此严重的外周B淋巴细胞消耗,也未观察到不利的健康影响。而且,还观察到B细胞总数的恢复,由此得出结论,通过治疗,这些灵长类动物的多能干细胞不会受到不利影响。
B.C2B8的临床分析
i.C2B8的I/II期临床试验:单剂量治疗研究
将组织学记载复发B细胞瘤的15个病人,在I/II期临床试验中以C2B8治疗。以剂量逐步升级实验方式给每个病人以单剂量C2B8,即以10mg/m2,50mg/m2,100mg/m2,250mg/m2及500mg/m2量,每种剂量分别给予3个病人,通过0.22微米孔衬里滤器经静脉输注进行治疗,输注用生理盐水稀释至最终体积250cc或最大浓度1mg/ml的C2B8。第1小时内初始输入速度为50cc/hr,若未发现毒性反应,则剂量输入速度可逐渐加大直至最大值200cc/hr。
毒性(由临床医生指明的)分级为从“无”,到“发热”,到“中度”(两个病人)直至“严重”(一个病人),所有病人均完成了此治疗处理过程。分析外周血淋巴细胞,特别测定C2B8对T细胞和B细胞的影响。所有的病人得到一致结果,用C2B8输注之后消耗外周血B淋巴细胞,此种消耗维持两星期以上。
一个病人(接受100mg/m2C2B8)表现出对C2B8治疗的部分反应(持续四周以上,所有可测量显示的患部两垂直直径之积相加,共降低了50%以上,在此期间无新患部出现且已有的患部无增大现象),至少另一个病人(接受500mg/m2)表现出对C2B8治疗的较差反应(所有可测量显示的患部两最大垂直直径之积相加,共降低不到50%,但至少有25%)。对于有代表性的效率,其PBL结果示于图14中,表现出PR的病人其数据在图14A中,表现出MR的病人其数据示于图14B。图14中,下述符号表示:=淋巴细胞,=CD3+细胞(T细胞),=CD20+细胞,=CD10+细胞,=κ, =λ及=C2B8。正如所表明的,B细胞标志CD20和CD19,κ和λ,在两星期之上均被消耗,而T细胞数量只开始有稍许下降,并在相当快的时间内便回复到近似基线水平。
ii.C2B8的I/II期临床试验:多剂量治疗研究
有明显进行性症状的,组织学上证实患B细胞淋巴瘤的病人适于作此项实验,将其分为二部分:在I期,包括剂量递增至有限毒性特性剂量,并确定其生物学活性耐受剂量水平,每3个病人一组的各组,每周静脉输注C2B8共分为4次。三种水平的累积剂量如下:500mg/m2(125mg/m2/输注)、1000mg/m2(250mg/m2/输注)、1500mg/m2(375mg/m2/输注,定义生物学活性 耐受剂量并确定之,其定义为既具有可耐受的毒性又具有足够的活性的最低剂量)。在II期,其它病人将得到生物学活性可耐受剂量,但侧重测定C2B8四种剂量活性。
IV.结合治疗:C2B8和Y2B8
使用C2B8及Y2B8的结合治疗法在小鼠异记录模式(nu/nu小鼠,雌性,约10周龄)中使用B细胞成淋巴瘤(Ramos肿瘤细胞)进行研究。为进行比较,其它小鼠也用C2B8和Y2B8治疗。
在37℃和5%CO2条件下将Ramos肿瘤细胞(ATCC,CRL 1596)维持在使用补充有10%胎牛血清及谷氨酰胺的RPMI-1640的培养物中。给9只约7-10周龄的雌性裸鼠,使用装有25号针头的1cc注射器,经皮下注射1.7×106Ramos细胞(体积为0.10ml,HBSS),使其引发肿瘤。所有动物控制在层流通风厨中,并且所有的笼子,垫子,食物及水都经高压灭菌处理。通过割切肿瘤使肿瘤细能过筛,并将其通过40目筛,用IX HBSS(50mi)通过离心处理(1300RPM)将细胞洗二次,再悬浮于IX HBSS至10×106细胞/ml,于-70℃冷冻直至使用。
为满足不同实验条件,将细胞分几批将其解冻,用离心法(1300RPM)将其沉淀并用IX HBSS洗二次。然后再将细胞悬浮至约2.0×106细胞/ml。使用装有25号针头的1cc注射器给约9-12只小鼠皮下注射0.10mi细胞悬浮液,注射在动物的左边,接近中部区。在约两周后肿瘤扩展。将肿瘤切下并按上面所述处理,所试动物按前述注射1.67×106细胞的0.10ml HBSS悬浮液。
根据初步的剂量实验,确定采用200mg C2B8和100μCi Y2B8用于此项研究。给90只雌性nu/nu小鼠(约10周龄)注射肿瘤细胞。约10天后,将24只鼠分成四个实验组(六只一组)同时努力在各组中维持差不多的肿瘤大小分布(平均肿瘤大小,以肿瘤的长×宽之积表示,约为80mm2)。使用装有25号针头的100μl Hamilton注射器,按下述剂量,通过尾静脉注射法对下列各组进行处理:
A.生理盐水
B.Y2B8(100μCi)
C.C2B8(200μg)及
D.Y2B8(100μCi)+C2B8(200μg)
初次注射后,以C2B8治疗的组给予第二次C2B8注射(200μg/鼠),用测径器每2天或3天测量肿瘤一次。
按如下方法制备治疗材料:
A.制备Y2B8
将氯化钇[90](6mCi)移入聚丙烯试管,并用无金属2M乙酸钠调节pH值4.1-4.4。加入2B8-MX-DTPA(于生理盐水中0.3mg,见上面2B8-MX-DTPA的制备),并以涡旋方式轻轻混合。保温15分钟之后,加入0.05×体积20mMEDTA及0.05×体积2M乙酸钠使反应骤冷。将5.0μl该反应混合物在含75mg/ml HSA及1mM DTPA的2.5ml1×PBS(配制缓冲液)中稀释,测定其放射活性浓度,通过加入10.0μl到20ml EcolumeTM闪烁混合液中进行计数。将剩余的反应混合物加到3.0ml配制缓冲液中,无菌过滤并于2-8℃贮存直至使用。比活性(注射时为14mCi/mg)根据加到反应混合物中的抗体量使用放射性浓度和计算出的蛋白质浓度来计算。使用瞬息薄层色谱来测定蛋白相关放射性。放射性掺入为95%。使用之前将Y2B8在配制缓冲液中稀释,并无菌过滤(最后的放射性浓度是1.0mCi/ml)。
B.制备C2B8
按上述方法制备C2B8。C2B8在生理盐水中以5.0mg/ml浓度作为无菌试剂提供。注射之前,该C2B8在生理盐水中稀释至2.0mg/ml并无菌过滤。
C.结果
治疗之后,肿瘤大小表达为长宽之积。按图11(Y2B8与盐水相比),图12(C2B8与盐水相比),图13(Y2B8+C2B8与盐水相比)所示日期测量,也测定标准误差。
正如图13所示,Y2B8和C2B8结合使用表现出与单独使用Y2B8或者C2B8所获差不多的杀肿瘤效果。
V.其它治疗方案
以前述实施例的观点来找出其它治疗方案是显而易见的,一个这类方案是在约一星期内使用C2B8所用的治疗剂量,以2B8和放射性标记2B8(例如Y2B8)结合给药,或以2B8、C2B8及例如Y2B8一起给药,或者以C2B8和例如Y2B8一起给药。另一个方案是利用放射性标记的C2B8—该方案使得采用C2B8的免疫活性部分的优点加上了相应的放射性标记的优点。优选的放射性标记物包括钇[90],它可给出与C2B8与鼠抗体2B8相比较大的循 环半衰期。由于C2B8消耗B细胞的能力及可从放射标记物得到的优点,因此一个优选的替代方案是用C2B8(以单剂量或多剂量)治疗病人,使得大部分(假如不是全部)外周B细胞消耗掉,然后再用放射性标记2B8,因为外周B细胞已消耗掉,那么放射性标记2B8便增加了定靶肿瘤细胞的机会。由于已在文献中报道过以碘[131]标记的各种结果(见Kaminski的文献),故优选碘[131]标记的2B8。一个其它优选方案是首先使用放射性标记2B8(或C2B8),努力增加肿瘤的通透性,接着以单剂量或多剂量C2B8治疗。该方案的意图是增加C2B8达到肿瘤块的外边和里边的机会。一个进一步的方案是包括使用化疗剂与C2B8结合使用。该方案包括所谓“交错”治疗法,即用化疗剂治疗,接着用C2B8治疗,然后再重复此法。此外,开始用单剂或多剂量C2B8治疗,此后用化疗治疗也是可行的。优选的化疗剂包括(但不限于)环磷酰胺,阿霉素,长春新碱,及强的松(见Armitage,J.O.et al.,Cancer50:1695(1982)列入本文作为参考)。
前面列举的替代治疗方案并不作为一种限制范围,而应看作是有代表性的实例。
VI.有关保藏情况
抗-CD20于TCAE8中(为保藏起见在大肠杆菌中转化)保藏于美国典型培养物保藏中心(ATCC)(12301Parklawn Drive,Rockville,Maryland,20852),该保藏是遵从国际承认用于专利程序的微生物保藏,布达佩斯条约(简称布达佩斯条约)的规定而履行的。该微生物由ATCC于1992年11月9日进行过试验证明其该日期仍存活。ATCC指定该微生物的ATCC保藏号为:ATCC69119(抗-CD20于TCAE8中)。按布达佩斯条约规定,杂交瘤2B8于1993年6月22日[保藏于ATCC。该培养物的存活力于1993年6月25日测定过,ATCC指定该杂交瘤的ATCC保藏号为:HB11388。
序列表
(1)总的情况:
(i)申请人:生物基因IDEC公司(Biogen Idec Inc.)
(ii)发明题目:抗人类B淋巴细胞限制分化抗原的嵌合及放射标记抗体
(iii)序列数:8
(iv)通讯地址:
(A)收信人:
(B)街道:
(C)城市:
(D)州:
(E)国家:
(F)邮编:
(v)计算机可读类型:
(A)媒介类型:
(B)计算机:
(C)操作系统:
(D)软件:
(vi)现申请情况:
(A)申请号:
(B)申请日:
(C)分类:
(vii)代理人/代理机构情报:
(A)姓名:
(B)登记号:
(C)案卷号:
(viii)电讯情报:
(A)电话:
(B)传真:
(2)SEQ ID NO:1情报:
(i)序列特征:
(A)长度:8540碱基
(B)类型:核酸
(C)链型:单链
(D)拓扑结构:环型
(ii)分子类型:DNA(基因组的)
(iii)假设的:是
(iv)反义:否
(xi)序列描述:SEQ ID NO:1:
GACGTCGCGG CCGCTCTAGG CCTCCAAAAA AGCCTCCTCA CTACTTCTGG AATAGCTCAG 60
AGGCCGAGGC GGCCTCGGCC TCTGCATAAA TAAAAAAAAT TAGTCAGCCA TGCATGGGGC 120
GGAGAATGGG CGGAACTGGG CGGAGTTAGG GGCGGGATGG GCGGAGTTAG GGGCGGGACT 180
ATGGTTGCTG ACTAATTGAG ATGCATGCTT TGCATACTTC TGCCTGCTGG GGAGCCTGGG 240
GACTTTCCAC ACCTGGTTGC TGACTAATTG AGATGCATGC TTTGCATACT TCTGCCTGCT 300
GGGGAGCCTG GGGACTTTCC ACACCCTAAC TGACACACAT TCCACAGAAT TAATTCCCCT 360
AGTTATTAAT AGTAATCAAT TACGGGGTCA TTAGTTCATA GCCCATATAT GGAGTTCCGC 420
GTTACATAAC TTACGGTAAA TGGCCCGCCT GGCTGACCGC CCAACGACCC CCGCCCATTG 480
ACGTCAATAA TGACGTATGT TCCCATAGTA ACGCCAATAG GGACTTTCCA TTGACGTCAA 540
TGGGTGGACT ATTTACGGTA AACTGCCCAC TTGGCAGTAC ATCAAGTGTA TCATATGCCA 600
AGTACGCCCC CTATTGACGT CAATGACGGT AAATGGCCCG CCTGGCATTA TGCCCAGTAC 660
ATGACCTTAT GGGACTTTCC TACTTGGCAG TACATCTACG TATTAGTCAT CGCTATTACC 720
ATGGTGATGC GGTTTTGGCA GTACATCAAT GGGCGTGGAT AGCGGTTTGA CTCACGGGGA 780
TTTCCAAGTC TCCACCCCAT TGACGTCAAT GGGAGTTTGT TTTGGCACCA AAATCAACGG 840
GACTTTCCAA AATGTCGTAA CAACTCCGCC CCATTGACGC AAATGGGCGG TAGGCGTGTA 900
CGGTGGGAGG TCTATATAAG CAGAGCTGGG TACGTGAACC GTCAGATCGC CTGGAGACGC 960
CATCACAGAT CTCTCACCAT GAGGGTCCCC GCTCAGCTCC TGGGGCTCCT GCTGCTCTGG 1020
CTCCCAGGTG CACGATGTGA TGGTACCAAG GTGGAAATCA AACGTACGGT GGCTGCACCA 1080
TCTGTCTTCA TCTTCCCGCC ATCTGATGAG CAGTTGAAAT CTGGAACTGC CTCTGTTGTG 1140
TGCCTGCTGA ATAACTTCTA TCCCAGAGAG GCCAAAGTAC AGTGGAAGGT GGATAACGCC 1200
CTCCAATCGG GTAACTCCCA GGAGAGTGTC ACAGAGCAGG ACAGCAAGGA CAGCACCTAC 1260
AGCCTCAGCA GCACCCTGAC GCTGAGCAAA GCAGACTACG AGAAACACAA AGTCTACGCC 1320
TGCGAAGTCA CCCATCAGGG CCTGAGCTCG CCCGTCACAA AGAGCTTCAA CAGGGGAGAG 1380
TGTTGAATTC AGATCCGTTA ACGGTTACCA ACTACCTAGA CTGGATTCGT GACAACATGC 1440
GGCCGTGATA TCTACGTATG ATCAGCCTCG ACTGTGCCTT CTAGTTGCCA GCCATCTGTT 1500
GTTTGCCCCT CCCCCGTGCC TTCCTTGACC CTGGAAGGTG CCACTCCCAC TGTCCTTTCC 1560
TAATAAAATG AGGAAATTGC ATCGCATTGT CTGAGTAGGT GTCATTCTAT TCTGGGGGGT 1620
GGGGTGGGGC AGGACAGCAA GGGGGAGGAT TGGGAAGACA ATAGCAGGCA TGCTGGGGAT 1680
GCGGTGGGCT CTATGGAACC AGCTGGGGCT CGACAGCTAT GCCAAGTACG CCCCCTATTG 1740
ACGTCAATGA CGGTAAATGG CCCGCCTGGC ATTATGCCCA GTACATGACC TTATGGGACT 1800
TTCCTACTTG GCAGTACATC TACGTATTAG TCATCGCTAT TACCATGGTG ATGCGGTTTT 1860
GGCAGTACAT CAATGGGCGT GGATAGCGGT TTGACTCACG GGGATTTCCA AGTCTCCACC 1920
CCATTGACGT CAATGGGAGT TTGTTTTGGC ACCAAAATCA ACGGGACTTT CCAAAATGTC 1980
GTAACAACTC CGCCCCATTG ACGCAAATGG GCGGTAGGCG TGTACGGTGG GAGGTCTATA 2040
TAAGCAGAGC TGGGTACGTC CTCACATTCA GTGATCAGCA CTGAACACAG ACCCGTCGAC 2100
ATGGGTTGGA GCCTCATCTT GCTCTTCCTT GTCGCTGTTG CTACGCGTGT CGCTAGCACC 2160
AAGGGCCCAT CGGTCTTCCC CCTGGCACCC TCCTCCAAGA GCACCTCTGG GGGCACAGCG 2220
GCCCTGGGCT GCCTGGTCAA GGACTACTTC CCCGAACCGG TGACGGTGTC GTGGAACTCA 2280
GGCGCCCTGA CCAGCGGCGT GCACACCTTC CCGGCTGTCC TACAGTCCTC AGGACTCTAC 2340
TCCCTCAGCA GCGTGGTGAC CGTGCCCTCC AGCAGCTTGG GCACCCAGAC CTACATCTGC 2400
AACGTGAATC ACAAGCCCAG CAACACCAAG GTGGACAAGA AAGCAGAGCC CAAATCTTGT 2460
GACAAAACTC ACACATGCCC ACCGTGCCCA GCACCTGAAC TCCTGGGGGG ACCGTCAGTC 2520
TTCCTCTTCC CCCCAAAACC CAAGGACACC CTCATGATCT CCCGGACCCC TGAGGTCACA 2580
TGCGTGGTGG TGGACGTGAG CCACGAAGAC CCTGAGGTCA AGTTCAACTG GTACGTGGAC 2640
GGCGTGGAGG TGCATAATGC CAAGACAAAG CCGCGGGAGG AGCAGTACAA CAGCACGTAC 2700
CGTGTGGTCA GCGTCCTCAC CGTCCTGCAC CAGGACTGGC TGAATGGCAA GGACTACAAG 2760
TGCAAGGTCT CCAACAAAGC CCTCCCAGCC CCCATCGAGA AAACCATCTC CAAAGCCAAA 2820
GGGCAGCCCC GAGAACCACA GGTGTACACC CTGCCCCCAT CCCGGGATGA GCTGACCAGG 2880
AACCAGGTCA GCCTGACCTG CCTGGTCAAA GGCTTCTATC CCAGCGACAT CGCCGTGGAG 2940
TGGGAGAGCA ATGGGCAGCC GGAGAACAAC TACAAGACCA CGCCTCCCGT GCTGGACTCC 3000
GACGGCTCCT TCTTCCTCTA CAGCAAGCTC ACCGTGGACA AGAGCAGGTG GCAGCAGGGG 3060
AACGTCTTCT CATGCTCCGT GATGCATGAG GCTCTGCACA ACCACTACAC GCAGAAGAGC 3120
CTCTCCCTGT CTCCGGGTAA ATGAGGATCC GTTAACGGTT ACCAACTACC TAGACTGGAT 3180
TCGTGACAAC ATGCGGCCGT GATATCTACG TATGATCAGC CTCGACTGTG CCTTCTAGTT 3240
GCCAGCCATC TGTTGTTTGC CCCTCCCCCG TGCCTTCCTT GACCCTGGAA GGTGCCACTC 3300
CCACTGTCCT TTCCTAATAA AATGAGGAAA TTGCATCGCA TTGTCTGAGT AGGTGTCATT 3360
CTATTCTGGG GGGTGGGGTG GGGCAGGACA GCAAGGGGGA GGATTGGGAA GACAATAGCA 3420
GGCATGCTGG GGATGCGGTG GGCTCTATGG AACCAGCTGG GGCTCGACAG CGCTGGATCT 3480
CCCGATCCCC AGCTTTGCTT CTCAATTTCT TATTTGCATA ATGAGAAAAA AAGGAAAATT 3540
AATTTTAACA CCAATTCAGT AGTTGATTGA GCAAATGCGT TGCCAAAAAG GATGCTTTAG 3600
AGACAGTGTT CTCTGCACAG ATAAGGACAA ACATTATTCA GAGGGAGTAC CCAGAGCTGA 3660
GACTCCTAAG CCAGTGAGTG GCACAGCATT CTAGGGAGAA ATATGCTTGT CATCACCGAA 3720
GCCTGATTCC GTAGAGCCAC ACCTTGGTAA GGGCCAATCT GCTCACACAG GATAGAGAGG 3780
GCAGGAGCCA GGGCAGAGCA TATAAGGTGA GGTAGGATCA GTTGCTCCTC ACATTTGCTT 3840
CTGACATAGT TGTGTTGGGA GCTTGGATAG CTTGGACAGC TCAGGGCTGC GATTTCGCGC 3900
CAAACTTGAC GGCAATCCTA GCGTGAAGGC TGGTAGGATT TTATCCCCGC TGCCATCATG 3960
GTTCGACCAT TGAACTGCAT CGTCGCCGTG TCCCAAAATA TGGGGATTGG CAAGAACGGA 4020
GACCTACCCT GGCCTCCGCT CAGGAACGAG TTCAAGTACT TCCAAAGAAT GACCACAACC 4080
TCTTCAGTGG AAGGTAAACA GAATCTGGTG ATTATGGGTA GGAAAACCTG GTTCTCCATT 4140
CCTGAGAAGA ATCGACCTTT AAAGGACAGA ATTAATATAG TTCTCAGTAG AGAACTCAAA 4200
GAACCACCAC GAGGAGCTCA TTTTCTTGCC AAAAGTTTGG ATGATGCCTT AAGACTTATT 4260
GAACAACCGG AATTGGCAAG TAAAGTAGAC ATGGTTTGGA TAGTCGGAGG CAGTTCTGTT 4320
TACCAGGAAG CCATGAATCA ACCAGGCCAC CTTAGACTCT TTGTGACAAG GATCATGCAG 4380
GAATTTGAAA GTGACACGTT TTTCCCAGAA ATTGATTTGG GGAAATATAA ACTTCTCCCA 4440
GAATACCCAG GCGTCCTCTC TGAGGTCCAG GAGGAAAAAG GCATCAAGTA TAAGTTTGAA 4500
GTCTACGAGA AGAAAGACTA ACAGGAAGAT GCTTTCAAGT TCTCTGCTCC CCTCCTAAAG 4560
TCATGCATTT TTATAAGACC ATGGGACTTT TGCTGGCTTT AGATCAGCCT CGACTGTGCC 4620
TTCTAGTTGC CAGCCATCTG TTGTTTGCCC CTCCCCCGTG CCTTCCTTGA CCCTGGAAGG 4680
TGCCACTCCC ACTGTCCTTT CCTAATAAAA TGAGGAAATT GCATCGCATT GTCTGAGTAG 4740
GTGTCATTCT ATTCTGGGGG GTGGGGTGGG GCAGGACAGC AAGGGGGAGG ATTGGGAAGA 4800
CAATAGCAGG CATGCTGGGG ATGCGGTGGG CTCTATGGAA CCAGCTGGGG CTCGAGCTAC 4860
TAGCTTTGCT TCTCAATTTC TTATTTGCAT AATGAGAAAA AAAGGAAAAT TAATTTTAAC 4920
ACCAATTCAG TAGTTGATTG AGCAAATGCG TTGCCAAAAA GGATGCTTTA GAGACAGTGT 4980
TCTCTGCACA GATAAGGACA AACATTATTC AGAGGGAGTA CCCAGAGCTG AGACTCCTAA 5040
GCCAGTGAGT GGCACAGCAT TCTAGGGAGA AATATGCTTG TCATCACCGA AGCCTGATTC 5100
CGTAGAGCCA CACCTTGGTA AGGGCCAATC TGCTCACACA GGATAGAGAG GGCAGGAGCC 5160
AGGGCAGAGC ATATAAGGTG AGGTAGGATC AGTTGCTCCT CACATTTGCT TCTGACATAG 5220
TTGTGTTGGG AGCTTGGATC GATCCTCTAT GGTTGAACAA GATGGATTGC ACGCAGGTTC 5280
TCCGGCCGCT TGGGTGGAGA GGCTATTCGG CTATGACTGG GCACAACAGA CAATCGGCTG 5340
CTCTGATGCC GCCGTGTTCC GGCTGTCAGC GCAGGGGCGC CCGGTTCTTT TTGTCAAGAC 5400
CGACCTGTCC GGTGCCCTGA ATGAACTGCA GGACGAGGCA GCGCGGCTAT CGTGGCTGGC 5460
CACGACGGGC GTTCCTTGCG CAGCTGTGCT CGACGTTGTC ACTGAAGCGG GAAGGGACTG 5520
GCTGCTATTG GGCGAAGTGC CGGGGCAGGA TCTCCTGTCA TCTCACCTTG CTCCTGCCGA 5580
GAAAGTATCC ATCATGGCTG ATGCAATGCG GCGGCTGCAT ACGCTTGATC CGGCTACCTG 5640
CCCATTCGAC CACCAAGCGA AACATCGCAT CGAGCGAGCA CGTACTCGGA TGGAAGCCGG 5700
TCTTGTCGAT CAGGATGATC TGGACGAAGA GCATCAGGGG CTCGCGCCAG CCGAACTGTT 5760
CGCCAGGCTC AAGGCGCGCA TGCCCGACGG CGAGGATCTC GTCGTGACCC ATGGCGATGC 5820
CTGCTTGCCG AATATCATGG TGGAAAATGG CCGCTTTTCT GGATTCATCG ACTGTGGCCG 5880
GCTGGGTGTG GCGGACCGCT ATCAGGACAT AGCGTTGGCT ACCCGTGATA TTGCTGAAGA 5940
GCTTGGCGGC GAATGGGCTG ACCGCTTCCT CGTGCTTTAC GGTATCGCCG CTCCCGATTC 6000
GCAGCGCATC GCCTTCTATC GCCTTCTTGA CGAGTTCTTC TGAGCGGGAC TCTGGGGTTC 6060
GAAATGACCG ACCAAGCGAC GCCCAACCTG CCATCACGAG ATTTCGATTC CACCGCCGCC 6120
TTCTATGAAA GGTTGGGCTT CGGAATCGTT TTCCGGGACG CCGGCTGGAT GATCCTCCAG 6180
CGCGGGGATC TCATGCTGGA GTTCTTCGCC CACCCCAACT TGTTTATTGC AGCTTATAAT 6240
GGTTACAAAT AAAGCAATAG CATCACAAAT TTCACAAATA AAGCATTTTT TTCACTGCAT 6300
TCTAGTTGTG GTTTGTCCAA ACTCATCAAT CTATCTTATC ATGTCTGGAT CGCGGCCGCG 6360
ATCCCGTCGA GAGCTTGGCG TAATCATGGT CATAGCTGTT TCCTGTGTGA AATTGTTATC 6420
CGCTCACAAT TCCACACAAC ATACGAGCCG GAAGCATAAA GTGTAAAGCC TGGGGTGCCT 6480
AATGAGTGAG CTAACTCACA TTAATTGCGT TGCGCTCACT GCCCGCTTTC CAGTCGGGAA 6540
ACCTGTCGTG CCAGCTGCAT TAATGAATCG GCCAACGCGC GGGGAGAGGC GGTTTGCGTA 6600
TTGGGCGCTC TTCCGCTTCC TCGCTCACTG ACTCGCTGCG CTCGGTCGTT CGGCTGCGGC 6660
GAGCGGTATC AGCTCACTCA AAGGCGGTAA TACGGTTATC CACAGAATCA GGGGATAACG 6720
CAGGAAAGAA CATGTGAGCA AAAGGCCAGC AAAAGGCCAG GAACCGTAAA AAGGCCGCGT 6780
TGCTGGCGTT TTTCCATAGG CTCCGCCCCC CTGACGAGCA TCACAAAAAT CGACGCTCAA 6840
GTCAGAGGTG GCGAAACCCG ACAGGACTAT AAAGATACCA GGCGTTTCCC CCTGGAAGCT 6900
CCCTCGTGCG CTCTCCTGTT CCGACCCTGC CGCTTACCGG ATACCTGTCC GCCTTTCTCC 6960
CTTCGGGAAG CGTGGCGCTT TCTCAATGCT CACGCTGTAG GTATCTCAGT TCGGTGTAGG 7020
TCGTTCGCTC CAAGCTGGGC TGTGTGCACG AACCCCCCGT TCAGCCCGAC CGCTGCGCCT 7080
TATCCGGTAA CTATCGTCTT GAGTCCAACC CGGTAAGACA CGACTTATCG CCACTGGCAG 7140
CAGCCACTGG TAACAGGATT AGCAGAGCGA GGTATGTAGG CGGTGCTACA GAGTTCTTGA 7200
AGTGGTGGCC TAACTACGGC TACACTAGAA GGACAGTATT TGGTATCTGC GCTCTGCTGA 7260
AGCCAGTTAC CTTCGGAAAA AGAGTTGGTA GCTCTTGATC CGGCAAACAA ACCACCGCTG 7320
GTAGCGGTGG TTTTTTTGTT TGCAAGCAGC AGATTACGCG CAGAAAAAAA GGATCTCAAG 7380
AAGATCCTTT GATCTTTTCT ACGGGGTCTG ACGCTCAGTG GAACGAAAAC TCACGTTAAG 7440
GGATTTTGGT CATGAGATTA TCAAAAAGGA TCTTCACCTA GATCCTTTTA AATTAAAAAT 7500
GAAGTTTTAA ATCAATCTAA AGTATATATG AGTAAACTTG GTCTGACAGT TACCAATGCT 7560
TAATCAGTGA GGCACCTATC TCAGCGATCT GTCTATTTCG TTCATCCATA GTTGCCTGAC 7620
TCCCCGTCGT GTAGATAACT ACGATACGGG AGGGCTTACC ATCTGGCCCC AGTGCTGCAA 7680
TGATACCGCG AGACCCACGC TCACCGGCTC CAGATTTATC AGCAATAAAC CAGCCAGCCG 7740
GAAGGGCCGA GCGCAGAAGT GGTCCTGCAA CTTTATCCGC CTCCATCCAG TCTATTAATT 7800
GTTGCCGGGA AGCTAGAGTA AGTAGTTCGC CAGTTAATAG TTTGCGCAAC GTTGTTGCCA 7860
TTGCTACAGG CATCGTGGTG TCACGCTCGT CGTTTGGTAT GGCTTCATTC AGCTCCGGTT 7920
CCCAACGATC AAGGCGAGTT ACATGATCCC CCATGTTGTG CAAAAAAGCG GTTAGCTCCT 7980
TCGGTCCTCC GATCGTTGTC AGAAGTAAGT TGGCCGCAGT GTTATCACTC ATGGTTATGG 8040
CAGCACTGCA TAATTCTCTT ACTGTCATGC CATCCGTAAG ATGCTTTTCT GTGACTGGTG 8100
AGTACTCAAC CAAGTCATTC TGAGAATAGT GTATGCGGCG ACCGAGTTGC TCTTGCCCGG 8160
CGTCAATACG GGATAATACC GCGCCACATA GCAGAACTTT AAAAGTGCTC ATCATTGGAA 8220
AACGTTCTTC GGGGCGAAAA CTCTCAAGGA TCTTACCGCT GTTGAGATCC AGTTCGATGT 8280
AACCCACTCG TGCACCCAAC TGATCTTCAG CATCTTTTAC TTTCACCAGC GTTTCTGGGT 8340
GAGCAAAAAC AGGAAGGCAA AATGCCGCAA AAAAGGGAAT AAGGGCGACA CGGAAATGTT 8400
GAATACTCAT ACTCTTCCTT TTTCAATATT ATTGAAGCAT TTATCAGGGT TATTGTCTCA 8460
TGAGCGGATA CATATTTGAA TGTATTTAGA AAAATAAACA AATAGGGGTT CCGCGCACAT 8520
TTCCCCGAAA AGTGCCACCT 8540
(2)SEQ ID NO:2情报:
(i)序列特征:
(A)长度:9209碱基
(B)类型:核酸
(C)链型:单链
(D)拓扑结构:环型
(ii)分子类型:DNA(基因组的)
(iii)假设的:是
(iv)反义:否
(xi)序列描述:SEQ ID NO:2:
GACGTCGCGG CCGCTCTAGG CCTCCAAAAA AGCCTCCTCA CTACTTCTGG AATAGCTCAG 60
AGGCCGAGGC GGCCTCGGCC TCTGCATAAA TAAAAAAAAT TAGTCAGCCA TGCATGGGGC 120
GGAGAATGGG CGGAACTGGG CGGAGTTAGG GGCGGGATGG GCGGAGTTAG GGGCGGGACT 180
ATGGTTGCTG ACTAATTGAG ATGCATGCTT TGCATACTTC TGCCTGCTGG GGAGCCTGGG 240
GACTTTCCAC ACCTGGTTGC TGACTAATTG AGATGCATGC TTTGCATACT TCTGCCTGCT 300
GGGGAGCCTG GGGACTTTCC ACACCCTAAC TGACACACAT TCCACAGAAT TAATTCCCCT 360
AGTTATTAAT AGTAATCAAT TACGGGGTCA TTAGTTCATA GCCCATATAT GGAGTTCCGC 420
GTTACATAAC TTACGGTAAA TGGCCCGCCT GGCTGACCGC CCAACGACCC CCGCCCATTG 480
ACGTCAATAA TGACGTATGT TCCCATAGTA ACGCCAATAG GGACTTTCCA TTGACGTCAA 540
TGGGTGGACT ATTTACGGTA AACTGCCCAC TTGGCAGTAC ATCAAGTGTA TCATATGCCA 600
AGTACGCCCC CTATTGACGT CAATGACGGT AAATGGCCCG CCTGGCATTA TGCCCAGTAC 660
ATGACCTTAT GGGACTTTCC TACTTGGCAG TACATCTACG TATTAGTCAT CGCTATTACC 720
ATGGTGATGC GGTTTTGGCA GTACATCAAT GGGCGTGGAT AGCGGTTTGA CTCACGGGGA 780
TTTCCAAGTC TCCACCCCAT TGACGTCAAT GGGAGTTTGT TTTGGCACCA AAATCAACGG 840
GACTTTCCAA AATGTCGTAA CAACTCCGCC CCATTGACGC AAATGGGCGG TAGGCGTGTA 900
CGGTGGGAGG TCTATATAAG CAGAGCTGGG TACGTGAACC GTCAGATCGC CTGGAGACGC 960
CATCACAGAT CTCTCACTAT GGATTTTCAG GTGCAGATTA TCAGCTTCCT GCTAATCAGT 1020
GCTTCAGTCA TAATGTCCAG AGGACAAATT GTTCTCTCCC AGTCTCCAGC AATCCTGTCT 1080
GCATCTCCAG GGGAGAAGGT CACAATGACT TGCAGGGCCA GCTCAAGTGT AAGTTACATC 1140
CACTGGTTCC AGCAGAAGCC AGGATCCTCC CCCAAACCCT GGATTTATGC CACATCCAAC 1200
CTGGCTTCTG GAGTCCCTGT TCGCTTCAGT GGCAGTGGGT CTGGGACTTC TTACTCTCTC 1260
ACAATCAGCA GAGTGGAGGC TGAAGATGCT GCCACTTATT ACTGCCAGCA GTGGACTAGT 1320
AACCCACCCA CGTTCGGAGG GGGGACCAAG CTGGAAATCA AACGTACGGT GGCTGCACCA 1380
TCTGTCTTCA TCTTCCCGCC ATCTGATGAG CAGTTGAAAT CTGGAACTGC CTCTGTTGTG 1440
TGCCTGCTGA ATAACTTCTA TCCCAGAGAG GCCAAAGTAC AGTGGAAGGT GGATAACGCC 1500
CTCCAATCGG GTAACTCCCA GGAGAGTGTC ACAGAGCAGG ACAGCAAGGA CAGCACCTAC 1560
AGCCTCAGCA GCACCCTGAC GCTGAGCAAA GCAGACTACG AGAAACACAA AGTCTACGCC 1620
TGCGAAGTCA CCCATCAGGG CCTGAGCTCG CCCGTCACAA AGAGCTTCAA CAGGGGAGAG 1680
TGTTGAATTC AGATCCGTTA ACGGTTACCA ACTACCTAGA CTGGATTCGT GACAACATGC 1740
GGCCGTGATA TCTACGTATG ATCAGCCTCG ACTGTGCCTT CTAGTTGCCA GCCATCTGTT 1800
GTTTGCCCCT CCCCCGTGCC TTCCTTGACC CTGGAAGGTG CCACTCCCAC TGTCCTTTCC 1860
TAATAAAATG AGGAAATTGC ATCGCATTGT CTGAGTAGGT GTCATTCTAT TCTGGGGGGT 1920
GGGGTGGGGC AGGACAGCAA GGGGGAGGAT TGGGAAGACA ATAGCAGGCA TGCTGGGGAT 1980
GCGGTGGGCT CTATGGAACC AGCTGGGGCT CGACAGCTAT GCCAAGTACG CCCCCTATTG 2040
ACGTCAATGA CGGTAAATGG CCCGCCTGGC ATTATGCCCA GTACATGACC TTATGGGACT 2100
TTCCTACTTG GCAGTACATC TACGTATTAG TCATCGCTAT TACCATGGTG ATGCGGTTTT 2160
GGCAGTACAT CAATGGGCGT GGATAGCGGT TTGACTCACG GGGATTTCCA AGTCTCCACC 2220
CCATTGACGT CAATGGGAGT TTGTTTTGGC ACCAAAATCA ACGGGACTTT CCAAAATGTC 2280
GTAACAACTC CGCCCCATTG ACGCAAATGG GCGGTAGGCG TGTACGGTGG GAGGTCTATA 2340
TAAGCAGAGC TGGGTACGTC CTCACATTCA GTGATCAGCA CTGAACACAG ACCCGTCGAC 2400
ATGGGTTGGA GCCTCATCTT GCTCTTCCTT GTCGCTGTTG CTACGCGTGT CCTGTCCCAG 2460
GTACAACTGC AGCAGCCTGG GGCTGAGCTG GTGAAGCCTG GGGCCTCAGT GAAGATGTCC 2520
TGCAAGGCTT CTGGCTACAC ATTTACCAGT TACAATATGC ACTGGGTAAA ACAGACACCT 2580
GGTCGGGGCC TGGAATGGAT TGGAGCTATT TATCCCGGAA ATGGTGATAC TTCCTACAAT 2640
CAGAAGTTCA AAGGCAAGGC CACATTGACT GCAGACAAAT CCTCCAGCAC AGCCTACATG 2700
CAGCTCAGCA GCCTGACATC TGAGGACTCT GCGGTCTATT ACTGTGCAAG ATCGACTTAC 2760
TACGGCGGTG ACTGGTACTT CAATGTCTGG GGCGCAGGGA CCACGGTCAC CGTCTCTGCA 2820
GCTAGCACCA AGGGCCCATC GGTCTTCCCC CTGGCACCCT CCTCCAAGAG CACCTCTGGG 2880
GGCACAGCGG CCCTGGGCTG CCTGGTCAAG GACTACTTCC CCGAACCGGT GACGGTGTCG 2940
TGGAACTCAG GCGCCCTGAC CAGCGGCGTG CACACCTTCC CGGCTGTCCT ACAGTCCTCA 3000
GGACTCTACT CCCTCAGCAG CGTGGTGACC GTGCCCTCCA GCAGCTTGGG CACCCAGACC 3060
TACATCTGCA ACGTGAATCA CAAGCCCAGC AACACCAAGG TGGACAAGAA AGCAGAGCCC 3120
AAATCTTGTG ACAAAACTCA CACATGCCCA CCGTGCCCAG CACCTGAACT CCTGGGGGGA 3180
CCGTCAGTCT TCCTCTTCCC CCCAAAACCC AAGGACACCC TCATGATCTC CCGGACCCCT 3240
GAGGTCACAT GCGTGGTGGT GGACGTGAGC CACGAAGACC CTGAGGTCAA GTTCAACTGG 3300
TACGTGGACG GCGTGGAGGT GCATAATGCC AAGACAAAGC CGCGGGAGGA GCAGTACAAC 3360
AGCACGTACC GTGTGGTCAG CGTCCTCACC GTCCTGCACC AGGACTGGCT GAATGGCAAG 3420
GAGTACAAGT GCAAGGTCTC CAACAAAGCC CTCCCAGCCC CCATCGAGAA AACCATCTCC 3480
AAAGCCAAAG GGCAGCCCCG AGAACCACAG GTGTACACCC TGCCCCCATC CCGGGATGAG 3540
CTGACCAAGA ACCAGGTCAG CCTGACCTGC CTGGTCAAAG GCTTCTATCC CAGCGACATC 3600
GCCGTGGAGT GGGAGAGCAA TGGGCAGCCG GAGAACAACT ACAAGACCAC GCCTCCCGTG 3660
CTGGACTCCG ACGGCTCCTT CTTCCTCTAC AGCAAGCTCA CCGTGGACAA GAGCAGGTGG 3720
CAGCAGGGGA ACGTCTTCTC ATGCTCCGTG ATGCATGAGG CTCTGCACAA CCACTACACG 3780
CAGAAGAGCC TCTCCCTGTC TCCGGGTAAA TGAGGATCCG TTAACGGTTA CCAACTACCT 3840
AGACTGGATT CGTGACAACA TGCGGCCGTG ATATCTACGT ATGATCAGCC TCGACTGTGC 3900
CTTCTAGTTG CCAGCCATCT GTTGTTTGCC CCTCCCCCGT GCCTTCCTTG ACCCTGGAAG 3960
GTGCCACTCC CACTGTCCTT TCCTAATAAA ATGAGGAAAT TGCATCGCAT TGTCTGAGTA 4020
GGTGTCATTC TATTCTGGGG GGTGGGGTGG GGCAGGACAG CAAGGGGGAG GATTGGGAAG 4080
ACAATAGCAG GCATGCTGGG GATGCGGTGG GCTCTATGGA ACCAGCTGGG GCTCGACAGC 4140
GCTGGATCTC CCGATCCCCA GCTTTGCTTC TCAATTTCTT ATTTGCATAA TGAGAAAAAA 4200
AGGAAAATTA ATTTTAACAC CAATTCAGTA GTTGATTGAG CAAATGCGTT GCCAAAAAGG 4260
ATGCTTTAGA GACAGTGTTC TCTGCACAGA TAAGGACAAA CATTATTCAG AGGGAGTACC 4320
CAGAGCTGAG ACTCCTAAGC CAGTGAGTGG CACAGCATTC TAGGGAGAAA TATGCTTGTC 4380
ATCACCGAAG CCTGATTCCG TAGAGCCACA CCTTGGTAAG GGCCAATCTG CTCACACAGG 4440
ATAGAGAGGG CAGGAGCCAG GGCAGAGCAT ATAAGGTGAG GTAGGATCAG TTGCTCCTCA 4500
CATTTGCTTC TGACATAGTT GTGTTGGGAG CTTGGATAGC TTGGACAGCT CAGGGCTGCG 4560
ATTTCGCGCC AAACTTGACG GCAATCCTAG CGTGAAGGCT GGTAGGATTT TATCCCCGCT 4620
GCCATCATGG TTCGACCATT GAACTGCATC GTCGCCGTGT CCCAAAATAT GGGGATTGGC 4680
AAGAACGGAG ACCTACCCTG GCCTCCGCTC AGGAACGAGT TCAAGTACTT CCAAAGAATG 4740
ACCACAACCT CTTCAGTGGA AGGTAAACAG AATCTGGTGA TTATGGGTAG GAAAACCTGG 4800
TTCTCCATTC CTGAGAAGAA TCGACCTTTA AAGGACAGAA TTAATATAGT TCTCAGTAGA 4860
GAACTCAAAG AACCACCACG AGGAGCTCAT TTTCTTGCCA AAAGTTTGGA TGATGCCTTA 4920
AGACTTATTG AACAACCGGA ATTGGCAAGT AAAGTAGACA TGGTTTGGAT AGTCGGAGGC 4980
AGTTCTGTTT ACCAGGAAGC CATGAATCAA CCAGGCCACC TTAGACTCTT TGTGACAAGG 5040
ATCATGCAGG AATTTGAAAG TGACACGTTT TTCCCAGAAA TTGATTTGGG GAAATATAAA 5100
CTTCTCCCAG AATACCCAGG CGTCCTCTCT GAGGTCCAGG AGGAAAAAGG CATCAAGTAT 5160
AAGTTTGAAG TCTACGAGAA GAAAGACTAA CAGGAAGATG CTTTCAAGTT CTCTGCTCCC 5220
CTCCTAAAGC TATGCATTTT TATAAGACCA TGGGACTTTT GCTGGCTTTA GATCAGCCTC 5280
GACTGTGCCT TCTAGTTGCC AGCCATCTGT TGTTTGCCCC TCCCCCGTGC CTTCCTTGAC 5340
CCTGGAAGGT GCCACTCCCA CTGTCCTTTC CTAATAAAAT GAGGAAATTG CATCGCATTG 5400
TCTGAGTAGG TGTCATTCTA TTCTGGGGGG TGGGGTGGGG CAGGACAGCA AGGGGGAGGA 5460
TTGGGAAGAC AATAGCAGGC ATGCTGGGGA TGCGGTGGGC TCTATGGAAC CAGCTGGGGC 5520
TCGAGCTACT AGCTTTGCTT CTCAATTTCT TATTTGCATA ATGAGAAAAA AAGGAAAATT 5580
AATTTTAACA CCAATTCAGT AGTTGATTGA GCAAATGCGT TGCCAAAAAG GATGCTTTAG 5640
AGACAGTGTT CTCTGCACAG ATAAGGACAA ACATTATTCA GAGGGAGTAC CCAGAGCTGA 5700
GACTCCTAAG CCAGTGAGTG GCACAGCATT CTAGGGAGAA ATATGCTTGT CATCACCGAA 5760
GCCTGATTCC GTAGAGCCAC ACCTTGGTAA GGGCCAATCT GCTCACACAG GATAGAGAGG 5820
GCAGGAGCCA GGGCAGAGCA TATAAGGTGA GGTAGGATCA GTTGCTCCTC ACATTTGCTT 5880
CTGACATAGT TGTGTTGGGA GCTTGGATCG ATCCTCTATG GTTGAACAAG ATGGATTGCA 5940
CGCAGGTTCT CCGGCCGCTT GGGTGGAGAG GCTATTCGGC TATGACTGGG CACAACAGAC 6000
AATCGGCTGC TCTGATGCCG CCGTGTTCCG GCTGTCAGCG CAGGGGCGCC CGGTTCTTTT 6060
TGTCAAGACC GACCTGTCCG GTGCCCTGAA TGAACTGCAG GACGAGGCAG CGCGGCTATC 6120
GTGGCTGGCC ACGACGGGCG TTCCTTGCGC AGCTGTGCTC GACGTTGTCA CTGAAGCGGG 6180
AAGGGACTGG CTGCTATTGG GCGAAGTGCC GGGGCAGGAT CTCCTGTCAT CTCACCTTGC 6240
TCCTGCCGAG AAAGTATCCA TCATGGCTGA TGCAATGCGG CGGCTGCATA CGCTTGATCC 6300
GGCTACCTGC CCATTCGACC ACCAAGCGAA ACATCGCATC GAGCGAGCAC GTACTCGGAT 6360
GGAAGCCGGT CTTGTCGATC AGGATGATCT GGACGAAGAG CATCAGGGGC TCGCGCCAGC 6420
CGAACTGTTC GCCAGGCTCA AGGCGCGCAT GCCCGACGGC GAGGATCTCG TCGTGACCCA 6480
TGGCGATGCC TGCTTGCCGA ATATCATGGT GGAAAATGGC CGCTTTTCTG GATTCATCGA 6540
CTGTGGCCGG CTGGGTGTGG CGGACCGCTA TCAGGACATA GCGTTGGCTA CCCGTGATAT 6600
TGCTGAAGAG CTTGGCGGCG AATGGGCTGA CCGCTTCCTC GTGCTTTACG GTATCGCCGC 6660
TCCCGATTCG CAGCGCATCG CCTTCTATCG CCTTCTTGAC GAGTTCTTCT GAGCGGGACT 6720
CTGGGGTTCG AAATGACCGA CCAAGCGACG CCCAACCTGC CATCACGAGA TTTCGATTCC 6780
ACCGCCGCCT TCTATGAAAG GTTGGGCTTC GGAATCGTTT TCCGGGACGC CGGCTGGATG 6840
ATCCTCCAGC GCGGGGATCT CATGCTGGAG TTCTTCGCCC ACCCCAACTT GTTTATTGCA 6900
GCTTATAATG GTTACAAATA AAGCAATAGC ATCACAAATT TCACAAATAA AGCATTTTTT 6960
TCACTGCATT CTAGTTGTGG TTTGTCCAAA CTCATCAATC TATCTTATCA TGTCTGGATC 7020
GCGGCCGCGA TCCCGTCGAG AGCTTGGCGT AATCATGGTC ATAGCTGTTT CCTGTGTGAA 7080
ATTGTTATCC GCTCACAATT CCACACAACA TACGAGCCGG AAGCATAAAG TGTAAAGCCT 7140
GGGGTGCCTA ATGAGTGAGC TAACTCACAT TAATTGCGTT GCGCTCACTG CCCGCTTTCC 7200
AGTCGGGAAA CCTGTCGTGC CAGCTGCATT AATGAATCGG CCAACGCGCG GGGAGAGGCG 7260
GTTTGCGTAT TGGGCGCTCT TCCGCTTCCT CGCTCACTGA CTCGCTGCGC TCGGTCGTTC 7320
GGCTGCGGCG AGCGGTATCA GCTCACTCAA AGGCGGTAAT ACGGTTATCC ACAGAATCAG 7380
GGGATAACGC AGGAAAGAAC ATGTGAGCAA AAGGCCAGCA AAAGGCCAGG AACCGTAAAA 7440
AGGCCGCGTT GCTGGCGTTT TTCCATAGGC TCCGCCCCCC TGACGAGCAT CACAAAAATC 7500
GACGCTCAAG TCAGAGGTGG CGAAACCCGA CAGGACTATA AAGATACCAG GCGTTTCCCC 7560
CTGGAAGCTC CCTCGTGCGC TCTCCTGTTC CGACCCTGCC GCTTACCGGA TACCTGTCCG 7620
CCTTTCTCCC TTCGGGAAGC GTGGCGCTTT CTCAATGCTC ACGCTGTAGG TATCTCAGTT 7680
CGGTGTAGGT CGTTCGCTCC AAGCTGGGCT GTGTGCACGA ACCCCCCGTT CAGCCCGACC 7740
GCTGCGCCTT ATCCGGTAAC TATCGTCTTG AGTCCAACCC GGTAAGACAC GACTTATCGC 7800
CACTGGCAGC AGCCACTGGT AACAGGATTA GCAGAGCGAG GTATGTAGGC GGTGCTACAG 7860
AGTTCTTGAA GTGGTGGCCT AACTACGGCT ACACTAGAAG GACAGTATTT GGTATCTGCG 7920
CTCTGCTGAA GCCAGTTACC TTCGGAAAAA GAGTTGGTAG CTCTTGATCC GGCAAACAAA 7980
CCACCGCTGG TAGCGGTGGT TTTTTTGTTT GCAAGCAGCA GATTACGCGC AGAAAAAAAG 8040
GATCTCAAGA AGATCCTTTG ATCTTTTCTA CGGGGTCTGA CGCTCAGTGG AACGAAAACT 8100
CACGTTAAGG GATTTTGGTC ATGAGATTAT CAAAAAGGAT CTTCACCTAG ATCCTTTTAA 8160
ATTAAAAATG AAGTTTTAAA TCAATCTAAA GTATATATGA GTAAACTTGG TCTGACAGTT 8220
ACCAATGCTT AATCAGTGAG GCACCTATCT CAGCGATCTG TCTATTTCGT TCATCCATAG 8280
TTGCCTGACT CCCCGTCGTG TAGATAACTA CGATACGGGA GGGCTTACCA TCTGGCCCCA 8340
GTGCTGCAAT GATACCGCGA GACCCACGCT CACCGGCTCC AGATTTATCA GCAATAAACC 8400
AGCCAGCCGG AAGGGCCGAG CGCAGAAGTG GTCCTGCAAC TTTATCCGCC TCCATCCAGT 8460
CTATTAATTG TTGCCGGGAA GCTAGAGTAA GTAGTTCGCC AGTTAATAGT TTGCGCAACG 8520
TTGTTGCCAT TGCTACAGGC ATCGTGGTGT CACGCTCGTC GTTTGGTATG GCTTCATTCA 8580
GCTCCGGTTC CCAACGATCA AGGCGAGTTA CATGATCCCC CATGTTGTGC AAAAAAGCGG 8640
TTAGCTCCTT CGGTCCTCCG ATCGTTGTCA GAAGTAAGTT GGCCGCAGTG TTATCACTCA 8700
TGGTTATGGC AGCACTGCAT AATTCTCTTA CTGTCATGCC ATCCGTAAGA TGCTTTTCTG 8760
TGACTGGTGA GTACTCAACC AAGTCATTCT GAGAATAGTG TATGCGGCGA CCGAGTTGCT 8820
CTTGCCCGGC GTCAATACGG GATAATACCG CGCCACATAG CAGAACTTTA AAAGTGCTCA 8880
TCATTGGAAA ACGTTCTTCG GGGCGAAAAC TCTCAAGGAT CTTACCGCTG TTGAGATCCA 8940
GTTCGATGTA ACCCACTCGT GCACCCAACT GATCTTCAGC ATCTTTTACT TTCACCAGCG 9000
TTTCTGGGTG AGCAAAAACA GGAAGGCAAA ATGCCGCAAA AAAGGGAATA AGGGCGACAC 9060
GGAAATGTTG AATACTCATA CTCTTCCTTT TTCAATATTA TTGAAGCATT TATCAGGGTT 9120
ATTGTCTCAT GAGCGGATAC ATATTTGAAT GTATTTAGAA AAATAAACAA ATAGGGGTTC 9180
CGCGCACATT TCCCCGAAAA GTGCCACCT 9209
(2)SEQ ID NO:3情报:
(i)序列特征:
(A)长度:47碱基
(B)类型:核酸
(C)链型:单链
(D)拓扑结构:线型
(ii)分子类型:DNA(基因组的)
(iii)假设的:是
(iv)反义:否
(xi)序列描述:SEQ ID NO:3:
ATCACAGATC TCTCACCATG GATTTTCAGG TGCAGATTAT CAGCTTC 47
(2)SEQ ID NO:4情报:
(i)序列特征:
(A)长度:30碱基
(B)类型:核酸
(C)链型:单链
(D)拓扑结构:线型
(ii)分子类型:DNA(基因组的)
(iii)假设的:是
(iv)反义:是
(xi)序列描述:SEQ ID NO:4:
TGCAGCATCC GTACGTTTGA TTTCCAGCTT 30
(2)SEQ ID NO:5情报:
(i)序列特征:
(A)长度:384碱基
(B)类型:核酸
(C)链型:单链
(D)拓扑结构:线型
(ii)分子类型:DNA(基因组的)
(iii)假设的:是
(iv)反义:否
(ix)特征:
(A)名称/要点:CDS
(B)位置:1..384
(ix)特征:
(A)名称/要点:mat peptide
(B)位置:67..384
(xi)序列描述:SEQ ID NO:5:
ATG GAT TTT CAG GTG CAG ATT ATC AGC TTC CTG CTA ATC AGT GCT TCA 48
Met Asp Phe Gln Val Gln Ile Ile Ser Phe Leu Leu Ile Ser Ala Ser
-22-20-15-10
GTC ATA ATG TCC AGA GGG CAA ATT GTT CTC TCC CAG TCT CCA GCA ATC 96
Val Ile Met Ser Arg Gly Gln Ile Val Leu Ser Gln Ser Pro Ala Ile
-5-1 1 5 10
CTG TCT GCA TCT CCA GGG GAG AAG GTC ACA ATG ACT TGC AGG GCC AGC 144
Leu Ser Ala Ser Pro Gly Glu Lys Val Thr Met Thr Cys Arg Ala Ser
15 20 25
TCA AGT GTA AGT TAC ATC CAC TGG TTC CAG CAG AAG CCA GGA TCC TCC 192
Ser Ser Val Ser Tyr Ile His Trp Phe Gln Gln Lys Pro Gly Ser Ser
30 35 40
CCC AAA CCC TGG ATT TAT GCC ACA TCC AAC CTG GCT TCT GGA GTC CCT 240
Pro Lys Pro Trp Ile Tyr Ala Thr Ser Asn Leu Ala Ser Gly Val Pro
45 50 55
GTT CGC TTC AGT GGC AGT GGG TCT GGG ACT TCT TAC TCT CTC ACA ATC 288
Val Arg Phe Ser Gly Ser Gly Ser Gly Thr Ser Tyr Ser Leu Thr Ile
60 65 70
AGC AGA GTG GAG GCT GAA GAT GCT GCC ACT TAT TAC TGC CAG CAG TGG 336
Ser Arg Val Glu Ala Glu Asp Ala Ala Thr Tyr Tyr Cys Gln Gln Trp
75 80 85 90
ACT AGT AAC CCA CCC ACG TTC GGA GGG GGG ACC AAG CTG GAA ATC AAA 384
Thr Ser Asn Pro Pro Thr Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
95 100 105
(2)SEQ ID NO:6情报:
(i)序列特征:
(A)长度:27碱基
(B)类型:核酸
(C)链型:单链
(D)拓扑结构:线型
(ii)分子类型:DNA(基因组的)
(iii)假设的:是
(iv)反义:否
(xi)序列描述:SEQ ID NO:6:
GCGGCTCCCA CGCGTGTCCT GTCCCAG 27
(2)SEQ ID NO:7情报:
(i)序列特征:
(A)长度:29碱基
(B)类型:核酸
(C)链型:单链
(D)拓扑结构:线型
(ii)分子类型:DNA(基因组的)
(iii)假设的:是
(iv)反义:是
(ix)特征:
(A)名称/要点:misc_feature
(B)位置:3
(D)其它情报:/note=″第3位的核苷酸是N,N为G或C。″
(ix)特征:
(A)名称/要点:misc_feature
(B)位置:18
(D)其它情报:/note=″第18位的核苷酸是N,N为A或C。″
(ix)特征:
(A)名称/要点:misc_feature
(B)位置:19
(D)其它情报:/note=″第19位的核苷酸是N,N为A或G。″
(ix)特征:
(A)名称/要点:misc_feature
(B)位置:25
(D)其它情报:/note=″第25位的核苷酸是N,N是G或A。″
(xi)序列描述:SEQ ID NO:7:
GGNTGTTGTG CTAGCTGNNG AGACNGTGA 29
(2)SEQ ID NO:8情报:
(i)序列特征:
(A)长度:420碱基
(B)类型:核酸
(C)链型:单链
(D)拓扑结构:线型
(ii)分子类型:DNA(基因组的)
(iii)假设的:是
(iv)反义:否
(ix)特征:
(A)名称/要点:CDS
(B)位置:1..420
(ix)特征:
(A)名称/要点:mat_peptide
(B)位置:58..420
(xi)序列描述:SEQ ID NO:8:
ATG GGT TGG AGC CTC ATC TTG CTC TTC CTT GTC GCT GTT GCT ACG CGT 48
Met Gly Trp Ser Leu Ile Leu Leu Phe Leu Val Ala Val Ala Thr Arg
-19-15-10-5
GTC CTG TCC CAG GTA CAA CTG CAG CAG CCT GGG GCT GAG CTG GTG AAG 96
Val Leu Ser Gln Val Gln Leu Gln Gln Pro Gly Ala Glu Leu Val Lys
-1 1 5 10
CCT GGG GCC TCA GTG AAG ATG TCC TGC AAG GCT TCT GGC TAC ACA TTT 144
Pro Gly Ala Ser Val Lys Met Ser Cys Lys Ala Ser Gly Tyr Thr Phe
15 20 25
ACC AGT TAC AAT ATG CAC TGG GTA AAA CAG ACA CCT GGT CGG GGC CTG 192
Thr Ser Tyr Asn Met His Trp Val Lys Gln Thr Pro Gly Arg Gly Leu
30 35 40 45
GAA TGG ATT GGA GCT ATT TAT CCC GGA AAT GGT GAT ACT TCC TAC AAT 240
Glu Trp Ile Gly Ala Ile Tyr Pro Gly Asn Gly Asp Thr Ser Tyr Asn
50 55 60
CAG AAG TTC AAA GGC AAG GCC ACA TTG ACT GCA GAC AAA TCC TCC AGC 288
Gln Lys Phe Lys Gly Lys Ala Thr Leu Thr Ala Asp Lys Ser Ser Ser
65 70 75
ACA GCC TAC ATG CAG CTC AGC AGC CTG ACA TCT GAG GAC TCT GCG GTC 336
Thr Ala Tyr Met Gln Leu Ser Ser Leu Thr Ser Glu Asp Ser Ala Val
80 85 90
TAT TAC TGT GCA AGA TCG ACT TAC TAC GGC GGT GAC TGG TAC TTC AAT 384
Tyr Tyr Cys Ala Arg Ser Thr Tyr Tyr Gly Gly Asp Trp Tyr Phe Asn
95 100 105
GTC TGG GGC GCA GGG ACC ACG GTC ACC GTC TCT GCA
Val Trp Gly Ala Gly Thr Thr Val Thr Val Ser Ala
110 115 120
Claims (14)
1.一种免疫学活性嵌合抗CD20抗体,其包含抗体轻链和重链,其中抗体的轻链包含图4所示氨基酸序列的轻链可变区和人轻链不变区,且抗体的重链包含图5所示氨基酸序列的重链可变区和人重链不变区。
2.权利要求1的免疫学活性嵌合抗CD20抗体,其中所述人轻链不变区是人κ轻链不变区,且其中所述人重链不变区是人IgG1不变区。
3.一种分离的核酸,其编码权利要求1的嵌合抗CD20抗体的轻链和重链,其中所述分离的核酸包含图4所示编码轻链可变区的核酸序列和图5所示编码重链可变区的核酸序列,且其中该嵌合抗CD20抗体的轻链和重链包含人轻链和重链不变区。
4.权利要求3的分离的核酸,其中所述人轻链不变区是人κ轻链不变区,且其中所述人重链不变区是人IgG1不变区。
5.一种表达载体TCAE8,其包含权利要求3或4的分离的核酸。
6.一种生成嵌合抗CD20抗体的中国仓鼠卵巢(CHO)细胞系,其中所述细胞系包含编码权利要求1的嵌合抗CD20抗体的轻链和重链的DNA,其中所述DNA包含图4所示编码轻链可变区的核酸序列和图5所示编码重链可变区的核酸序列,且其中该嵌合抗CD20抗体的轻链和重链包含人轻链和重链不变区。
7.权利要求6的CHO细胞系,其中所述人轻链不变区是人κ轻链不变区,且其中所述人重链不变区是人IgG1不变区。
8.一种生成嵌合抗CD20抗体的SP2/0细胞系,其中所述细胞系包含编码权利要求1的嵌合抗CD20抗体的DNA,其中所述DNA包含图4所示编码轻链可变区的核酸序列和图5所示编码重链可变区的核酸序列,且其中该嵌合抗CD20抗体的轻链和重链包含人轻链和重链不变区。
9.权利要求8的SP2/0细胞系,其中所述人轻链不变区是人κ轻链不变区,且其中所述人重链不变区是人IgG1不变区。
10.一种生产嵌合抗CD20抗体的方法,该方法包括在生成嵌合抗CD20抗体的中国仓鼠卵巢细胞(CHO)或SP2/0细胞系中表达抗体的轻链和重链,其中所述细胞系包含编码权利要求1的嵌合抗CD20抗体的轻链和重链的DNA,其中所述DNA包含图4所示编码轻链可变区的核酸序列和图5所示编码重链可变区的核酸序列,且其中该嵌合抗CD20抗体的轻链和重链包含人轻链和重链不变区。
11.权利要求10的方法,其中所述人轻链不变区是人κ轻链不变区,且其中所述人重链不变区是人IgG1不变区。
12.权利要求10或11的方法,其中所述细胞系是CHO细胞系。
13.权利要求10或11的方法,其中所述细胞系是SP2/0细胞系。
14.权利要求10-13任一项的方法,其中所述抗体的轻链和重链是自TCAE8载体表达的。
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US97889192A | 1992-11-13 | 1992-11-13 | |
US07/978,891 | 1992-11-13 |
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CN2004100488083A Expired - Lifetime CN1607006B (zh) | 1992-11-13 | 1993-11-12 | 抗人类b淋巴细胞限制分化抗原的嵌合及放射标记抗体在治疗b细胞淋巴瘤中的应用 |
CN2006100900848A Expired - Lifetime CN101007851B (zh) | 1992-11-13 | 1993-11-12 | 抗人类b淋巴细胞限制分化抗原的嵌合及放射标记抗体 |
CN2006100900829A Expired - Lifetime CN1912111B (zh) | 1992-11-13 | 1993-11-12 | 抗人类b淋巴细胞限制分化抗原的嵌合及放射标记抗体 |
CNB931214246A Expired - Lifetime CN1270774C (zh) | 1992-11-13 | 1993-11-12 | 抗人类b淋巴细胞限制分化抗原的嵌合及放射标记抗体 |
CN200610090080XA Expired - Lifetime CN101007850B (zh) | 1992-11-13 | 1993-11-12 | 抗人类b淋巴细胞限制分化抗原的嵌合及放射标记抗体 |
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CNB931214246A Expired - Lifetime CN1270774C (zh) | 1992-11-13 | 1993-11-12 | 抗人类b淋巴细胞限制分化抗原的嵌合及放射标记抗体 |
CN200610090080XA Expired - Lifetime CN101007850B (zh) | 1992-11-13 | 1993-11-12 | 抗人类b淋巴细胞限制分化抗原的嵌合及放射标记抗体 |
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US (2) | US5736137A (zh) |
EP (1) | EP2000149B1 (zh) |
KR (1) | KR100365632B1 (zh) |
CN (5) | CN1607006B (zh) |
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BR (1) | BR1100622A (zh) |
CA (1) | CA2626445A1 (zh) |
DE (3) | DE69334285D1 (zh) |
DK (2) | DK1005870T3 (zh) |
ES (2) | ES2326144T3 (zh) |
FR (1) | FR04C0018I2 (zh) |
GE (3) | GEP20074162B (zh) |
HK (3) | HK1109633A1 (zh) |
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IL (1) | IL107591A (zh) |
LU (1) | LU91620I2 (zh) |
MY (1) | MY111196A (zh) |
NL (1) | NL300424I1 (zh) |
PL (1) | PL175557B1 (zh) |
PT (2) | PT2000149E (zh) |
SG (1) | SG45294A1 (zh) |
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