title: Ciprofloxacin-induced inhibition of topoisomerase II in human lymphoblastoid cells.
abstract: The antibacterial activities of the fluorinated 4-quinolones (e.g., ciprofloxacin) have been ascribed to a marked inhibition of bacterial DNA gyrase. In contrast, the influence on purified mammalian DNA enzymes, including topoisomerases, has been reported to be several orders of magnitude weaker, occurring at concentrations higher than 100 micrograms of ciprofloxacin per ml. In this study, using a nondenaturing filter elution method, a marked induction of double-strand DNA breaks in human lymphoblastoid cells exposed to 80 micrograms of ciprofloxacin per ml was seen. The proportion of single-strand versus double-strand DNA breaks was similar to that seen with the topoisomerase II inhibitory antitumor agent VP-16. The cellular recovery was more rapid after treatment with ciprofloxacin than after treatment with VP-16, displaying a normal elution profile within 15 min at 37 degrees C (60 min for VP-16). These data indicate that ciprofloxacin has an effect on intracellularly located topoisomerase II in humans.
authors.affiliation: Department of Medical Microbiology, Malmö General Hospital, University of Lund, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Bredberg
authors.forename: M
authors.initials: M
authors.lastname: Brant
authors.forename: M
authors.initials: M
authors.lastname: Jaszyk
mesh_terms: D002460:Cell Line; D002939:Ciprofloxacin / Q000494:pharmacology*; D004247:DNA / Q000187:drug effects / Q000528:radiation effects; D004250:DNA Topoisomerases, Type II / Q000528:radiation effects; D005047:Etoposide / Q000494:pharmacology; D006801:Humans; D059005:Topoisomerase II Inhibitors
chemical_list: D059005:Topoisomerase II Inhibitors; D002939:Ciprofloxacin; D005047:Etoposide; D004247:DNA; D004250:DNA Topoisomerases, Type II