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    • 64. 发明申请
    • MODIFIED ANTIBODIES
    • 改良抗体
    • WO1990010700A1
    • 1990-09-20
    • PCT/GB1990000375
    • 1990-03-13
    • CELLTECH LIMITEDADAIR, David, RobertKING, David, JohnYARRANTON, Geoffrey, Thomas
    • CELLTECH LIMITED
    • C12N15/13
    • C07K16/00A61K38/00
    • There is provided a modified antibody having an altered number of glycosylation sites as compared to the number in the equivalent natural antibody. Preferably the modified antibody is produced by recombinant DNA techniques involving the production of an expression vector containing a DNA sequence encoding a modified antibody chain having an altered number of glycosylation sites. The DNA sequence may be prepared from the natural antibody gene by site-directed mutagenesis. Preferably the modified antibody chain has an increased number of glycosylation sites; for instance a modified Fab, Fab' or (Fab')2 antibody with a glycosylation site introduced into the CL or CHl domain thereof. Altering the degree of glycosylation alters properties of the antibodies, e.g. blood clearance rate, when used in vivo; generally the greater the degree of glycosylation the slower the blood clearance. The altered antibodies may be used for the preparation of compositions for use in diagnosis, e.g. in vivo diagnosis and imaging, or in therapy; glycosylation minus/reduced antibodies being preferred for diagnostic uses and glycosylation plus/increased antibodies being preferred for therapeutic application.
    • 70. 发明申请
    • PROCESS FOR PURIFYING A PLASMINOGEN ACTIVATOR
    • 纯化激活剂的方法
    • WO1988000615A1
    • 1988-01-28
    • PCT/GB1987000498
    • 1987-07-15
    • CELLTECH LIMITEDKENNEY, Andrew, CharlesPERRY, Angela, JoyceWHITE, SusanMARSTON, Fiona, Angela, Olinda
    • CELLTECH LIMITED
    • C12N09/64
    • C12N9/6459C12Y304/21069
    • Process for the purification of tPA comprising: applying a mother solution containing tPA to a highly anionic chromatography medium (HACM) equilibrated with a buffer at 25mS ionic strength or lower and at a pH between 4 and 7; eluting the tPA from the highly anionic chromatography medium with a high ionic strength buffer; applying the eluate from the highly anionic chromatography medium to an affinity chromatography medium (ACM), comprising an anti-tPA antibody covalently bound to a chromatography material, equilibrated with a buffer at pH 5 to 10; and eluting the tPA from the affinity chromatography medium with a buffer which disrupts the binding of the antibody to the tPA. Preferably, the mother solution is the supernatant from a culture of a eukaryotic cell line which has been transformed by recombinant DNA technology so that it is able to express and secrete tPA. Advantageously the mother solution is processed as soon as it is harvested and all the process steps are carried out as quickly as possible, the mother solution contains a serine protease inhibitor, and all the solutions contain a detergent and are kept at as low a pH as possible.
    • 用于纯化tPA的方法,包括:将含有tPA的母液施加到用25mS离子强度或更低的pH在4至7之间的缓冲液平衡的高度阴离子色谱介质(HACM)上; 用高离子强度缓冲液从高度阴离子色谱介质中洗脱tPA; 将洗脱液从高度阴离子色谱介质施加到亲和层析介质(ACM),其包含与pH 5至10的缓冲液平衡的与色谱材料共价结合的抗tPA抗体; 并用缓冲液从亲和层析介质中洗脱tPA,破坏抗体与tPA的结合。 优选地,母液是通过重组DNA技术转化的真核细胞系的培养物的上清液,使得其能够表达和分泌tPA。 有利的是,一旦收获母液即可迅速处理母液,母液中含有丝氨酸蛋白酶抑制剂,所有溶液都含有洗涤剂,并保持在pH 可能。