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    • 4. 发明申请
    • PRODUCTION OF PLASMINOGEN ACTIVATOR FROM CELLS AT WHICH LECTIN IS ADDED TO THE CULTURE MEDIUM
    • 从培养基中添加培养基的细胞培养细胞激活剂
    • WO1989002917A1
    • 1989-04-06
    • PCT/GB1988000758
    • 1988-09-16
    • PORTON PRODUCTS LIMITEDKEARNS, Michael, JohnMcENTEE, Ian, DavidNORTH, John, Robert
    • PORTON PRODUCTS LIMITED
    • C12N09/64
    • C12N9/6459C12Y304/21069
    • Increased yields of enzymes, particularly tissue plasminogen activator (tPA), are produced from cells, particularly CNCM I-222 cells, by a process using less concentrated lectin, particularly concanavalin A, in culture medium added to replace initial growth medium than has been used hitherto. After first harvesting of enzyme in supernatants, the culture can be reactivated by the addition of fresh culture medium containing an even lower lectin concentration, and a further harvest of enzyme obtained. The two harvests of enzyme together can give a greater overall yield than a single harvest after a single induction step employing the conventionally used higher lectin concentration. Enzyme yield can be further increased by repeating the last incubation step once or twice to obtain one or two further harvests.
    • 通过使用较少浓缩的凝血素(特别是伴刀豆球蛋白A)的方法在细胞,特别是CNCM I-222细胞中提高酶的产量,特别是组织纤溶酶原激活物(tPA)的产量,在添加以替代初始生长培养基的培养基中比已经使用 迄今。 在上清液中首次收获酶后,可以通过加入含有甚至更低凝集素浓度的新鲜培养基来再培养培养物,并进一步收获获得的酶。 在采用常规使用的较高凝集素浓度的单一诱导步骤之后,酶的两次收获可以比单次收获更大的总产量。 通过重复最后一次孵育步骤一次或两次可以进一步提高酶产量,以获得一个或两个进一步收获。