Topoisomerase inhibition by lucanthone, an adjuvant in radiation therapy.

Article Details

Citation

Bases RE, Mendez F

Topoisomerase inhibition by lucanthone, an adjuvant in radiation therapy.

Int J Radiat Oncol Biol Phys. 1997 Mar 15;37(5):1133-7.

PubMed ID
9169823 [ View in PubMed
]
Abstract

PURPOSE: To determine whether lucanthone can inhibit human topoisomerases in vitro. METHODS AND MATERIALS: Lucanthone was incubated with human topoisomerases II and I together with their plasmid substrates, to determine if lucanthone interfered with the catalytic activities of topoisomerases and if it enhanced the formation of DNA strand breaks, as determined by agarose gel electrophoresis of the resultant plasmid forms. RESULTS: Incubation of the enzymes with lucanthone inhibited the catalytic activity of topoisomerases II and I. With topoisomerase II, it increased the abundance of DNA double strand breaks (cleavable complexes). CONCLUSION: Lucanthone, like actinomycin D, inhibited topoisomerases II and I. It may act to enhance the yield of DNA double strand breaks in cells through a mechanism of topoisomerase II inhibition.

DrugBank Data that Cites this Article

Drug Targets
DrugTargetKindOrganismPharmacological ActionActions
LucanthoneDNA topoisomerase 1ProteinHumans
Yes
Inhibitor
Details
LucanthoneDNA topoisomerase 2-alphaProteinHumans
Yes
Inhibitor
Details