Amplification and expression of recombinant genes in serum-independent Chinese hamster ovary cells.

Abstract:

:CHO SSF3 cells grow as a suspension culture in unmodified commercial medium with only low-molecular weight ingredients. Continuous serum-free culture unexpectedly induced expression of a low dihydrofolate reductase activity in the originally dhfr- CHO cells. Nevertheless, it was possible with methotrexate to induce amplification of a gene coding for the hybrid plasminogen activator K2tu-PA cotransfected with a dhfr gene. Expression of K2tu-PA expression was proportionally increased to that of dhfr, which was measured with fluorescent methotrexate. Because no serum proteases were present, secreted K2tu-PA was not converted to the enzymatically active form, but was exclusively recovered in proenzyme form.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Gandor C,Leist C,Fiechter A,Asselbergs FA

doi

10.1016/0014-5793(95)01328-8

subject

Has Abstract

pub_date

1995-12-27 00:00:00

pages

290-4

issue

3

eissn

0014-5793

issn

1873-3468

pii

0014-5793(95)01328-8

journal_volume

377

pub_type

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