title: Comet assay studies on the activation of two diaziridinylbenzoquinones in K562 cells.
abstract: Two versions of the comet assay have been used to identify the difference in the modes of action of AZQ (2,5-diaziridinyl-3,6-bis(carboethoxyamino)-1,4-benzoquinone) and BZQ (2,5-diaziridinyl-3,6-bis(ethanolamino)-1,4-benzoquinone) in human leukaemia K562 cells and a K562-derived resistant cell line, BZQR. Using the standard alkaline assay, AZQ produced dose-dependent changes in the mean comet moments from K562 cells, consistent with the formation of strand breaks. This damage was repaired over a period of 6 hr after removal of the drug. The resistant cell line, BZQR, showed much smaller changes in comet moment under identical conditions. In contrast to AZQ, BZQ did not produce any measurable strand breaks in the K562 or BZQR cells. However, the comet radiation/crosslinking assay and a fluorescence-based assay revealed that BZQ extensively cross-links DNA in K562 cells. The extent of cross-linking is greatly reduced in the resistant cell line.
authors.affiliation: CRC Department of Cell Culture, Paterson Institute for Cancer Research, Christie Hospital, Manchester, U.K.
authors.forename: T H
authors.initials: TH
authors.lastname: Ward
authors.forename: J
authors.initials: J
authors.lastname: Butler
authors.forename: H
authors.initials: H
authors.lastname: Shahbakhti
authors.forename: J T
authors.initials: JT
authors.lastname: Richards
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D001388:Aziridines / Q000494:pharmacology*; D016227:Benzoquinones / Q000494:pharmacology*; D003432:Cross-Linking Reagents / Q000494:pharmacology; D004249:DNA Damage; D004260:DNA Repair; D004351:Drug Resistance; D004587:Electrophoresis, Agar Gel / Q000379:methods; D006801:Humans; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D001388:Aziridines; D016227:Benzoquinones; D003432:Cross-Linking Reagents; C045315:NSC 224070; C029108:diaziquone