title: Cross-linking and sequence-specific alkylation of DNA by aziridinylquinones. 3. Effects of alkyl substituents.
abstract: The cytotoxicities and DNA cross-linking abilities of several alkyl-substituted diaziridinylquinones have been investigated. The cytotoxicities were determined in DT-diaphorase-rich (H460 and HT29) and -deficient (H596 and BE) cell lines. It was shown that the cytotoxicities in these cell lines correlated with the relative rates of reduction by the purified human enzyme and with the cross-linking efficiencies. The rates of reduction by DT-diaphorase were more dependent on the structures of the compounds than the reduction potentials, as determined by cyclic voltammetry. A computer model was also used to explain high efficiency of cross-linking and the GNC sequence selectivity of the reduced methyl-substituted diaziridinylquinones.
authors.affiliation: CRC Section of Drug Development and Imaging, Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Manchester M20 9BX, U. K.
authors.forename: R H
authors.initials: RH
authors.lastname: Hargreaves
authors.forename: C C
authors.initials: CC
authors.lastname: O'Hare
authors.forename: J A
authors.initials: JA
authors.lastname: Hartley
authors.forename: D
authors.initials: D
authors.lastname: Ross
authors.forename: J
authors.initials: J
authors.lastname: Butler
mesh_terms: D018906:Antineoplastic Agents, Alkylating / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D001388:Aziridines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002460:Cell Line; D003432:Cross-Linking Reagents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D004247:DNA / Q000737:chemistry / Q000378:metabolism*; D006801:Humans; D008958:Models, Molecular; D016660:NAD(P)H Dehydrogenase (Quinone) / Q000172:deficiency / Q000378:metabolism; D011809:Quinones / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology
chemical_list: D018906:Antineoplastic Agents, Alkylating; D001388:Aziridines; D003432:Cross-Linking Reagents; D011809:Quinones; D004247:DNA; D016660:NAD(P)H Dehydrogenase (Quinone)