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Journal of Cell Science, Vol 105, Issue 2 563-569, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

Topoisomerase II inhibition prevents anaphase chromatid segregation in mammalian cells independently of the generation of DNA strand breaks

DJ Clarke, RT Johnson and CS Downes
Department of Zoology, University of Cambridge, UK.

Yeast temperature-sensitive mutants of DNA topoisomerase II are incapable of chromosome condensation and anaphase chromatid segregation. In mammalian cells, topoisomerase II inhibitors such as etoposide (VP-16-123) have similar effects. Unfortunately, conclusions drawn from work with mammalian cells have been limited by the fact that the standard inhibitors of topoisomerase II also generate DNA strand breaks, which when produced by other agents (e.g. ionizing radiation) are known to affect progression into and through mitosis. Here we show that the anti-tumour agent ICRF-193, recently identified as a topoisomerase II inhibitor operating by a non-standard mechanism, generates neither covalent complexes between topoisomerase II and DNA, nor adjacent DNA strand breaks, in mitotic HeLa. However, the drug does prevent anaphase segregation in HeLa and PtK2 cells, with effects similar to those of etoposide. We therefore conclude that topoisomerase II function is required for anaphase chromosome segregation in mammalian cells, as it is in yeast.
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© The Company of Biologists Ltd 1993