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Br J Cancer. 2000 Jan;82(2):488-91.

Modulation of DNA topoisomerase II activity and expression in melanoma cells with acquired drug resistance.

Author information

1
Institute of Pathology, Charité, Humboldt University Berlin, Germany.

Abstract

The role of DNA topoisomerases (Topo) IIalpha and IIbeta was investigated in various drug-resistant melanoma cells. Melanoma cells resistant to etoposide, exhibited an up to tenfold reduced Topo II activity corresponding to an increasing degree of drug resistance indicating that modulation of Topo II activity contribute to the drug-resistant phenotype. The reduction of Topo II activity was reflected by decreased nuclear amounts of both Topo II isoforms.

PMID:
10646909
PMCID:
PMC2363299
DOI:
10.1054/bjoc.1999.0947
[Indexed for MEDLINE]
Free PMC Article

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