Mitogen-induced topoisomerase II synthesis precedes DNA synthesis in human breast cancer cells.

Abstract:

:Cells released from quiescence exhibit increased levels of the DNA-modifying enzyme topoisomerase II, a nuclear protein which is also a target for antitumour drugs such as VP-16 (etoposide) and m-AMSA (4',9'-acridinylamino-methanesulfon-m-anisidide). By using Western blotting, DNA-protein crosslinking and drug-induced DNA cleavage to detect topoisomerase II, we show here that oestrogen stimulation of T-47D human breast cancer cells results in increased cellular enzyme content at least 4hr prior to enhancement of DNA synthesis. Taken in conjunction with previous findings, these results suggest that oestrogen enhances topoisomerase II synthesis within a G1-phase cell subset.

authors

Epstein RJ,Smith PJ

doi

10.1016/0006-291x(89)91613-6

subject

Has Abstract

pub_date

1989-04-14 00:00:00

pages

12-7

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(89)91613-6

journal_volume

160

pub_type

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