title: Effects of hydroxyl radical scavengers on relaxation of supercoiled DNA by aminomethyl-trimethyl-psoralen and monochromatic UVA photons.
abstract: The ability of scavengers of hydroxyl radical (OH radical) to modulate the photosensitized relaxation (induction of the first single-strand break) of supercoiled plasmid DNA with UVA photoactivated 4'-aminomethyl-4,5',8-trimethylpsoralen was examined by comparing the dose reduction factor (DRF: the ratio of fluence required to induce the same degree of relaxation in the absence to the presence of OH radical scavengers). The addition of mannitol, azide, acetate, or formate at concentrations inversely proportional to the value of the rate constants for the scavenging of OH radicals partially attenuated the supercoiled DNA relaxation. The degrees of protection afforded by the four scavengers in the presence of AMT photoactivated by either 334 nm or 365 nm monochromatic photons were similar, giving an average DRF of about 0.25 in all cases. Given the diverse chemical nature of the scavengers and their wide range of concentrations utilized, these findings are evidence for the involvement of a Type I photosensitization in the induction of DNA single-strand breaks by photoactivated AMT.
authors.affiliation: Center for Mechanistic Biology and Biotechnology, Argonne National Laboratory, IL, USA.
authors.forename: A A
authors.initials: AA
authors.lastname: Oroskar
authors.forename: C
authors.initials: C
authors.lastname: Lambert
authors.forename: M J
authors.initials: MJ
authors.lastname: Peak
mesh_terms: D000085:Acetates / Q000494:pharmacology; D019342:Acetic Acid; D001386:Azides / Q000494:pharmacology; D004278:DNA, Superhelical / Q000737:chemistry / Q000187:drug effects* / Q000528:radiation effects*; D005561:Formates / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000494:pharmacology*; D017665:Hydroxyl Radical / Q000737:chemistry* / Q000528:radiation effects; D008353:Mannitol / Q000494:pharmacology; D017319:Photosensitizing Agents / Q000494:pharmacology*; D010957:Plasmids / Q000187:drug effects / Q000528:radiation effects; D019810:Sodium Azide; D014307:Trioxsalen / Q000031:analogs & derivatives* / Q000494:pharmacology; D014466:Ultraviolet Rays
chemical_list: D000085:Acetates; D001386:Azides; D004278:DNA, Superhelical; D005561:Formates; D016166:Free Radical Scavengers; D017319:Photosensitizing Agents; C030544:formic acid; D017665:Hydroxyl Radical; D008353:Mannitol; D019810:Sodium Azide; C018822:aminomethyltrioxsalen; D019342:Acetic Acid; D014307:Trioxsalen