title: Photodynamic effects of haematoporphyrin derivative on DNA repair in murine L929 fibroblasts.
abstract: Illumination with red light of murine L929 fibroblasts that had been sensitized with haematoporphyrin derivative caused DNA single-strand breaks after a lag time of about 20 min, as revealed by alkaline elution. The cells appeared not to be capable of recovering from this damage. The photodynamic effect of haematoporphyrin derivative on DNA repair was assessed by monitoring the repair kinetics of DNA damage induced by either X-rays, u.v. light (254 nm) or methyl methanesulphonate treatment subsequent to a non-DNA-damaging photodynamic treatment with haematoporphyrin derivative. On 'post-incubation', the normally rapid repair of X-ray-induced DNA strand breaks did not occur, whereas with u.v. light and methyl methanesulphonate treatment after photodynamic treatment prolonged post-incubation resulted in an increase in the number of strand breaks rather than the normally observed decrease. This clearly shows that, after a photodynamic treatment with haematoporphyrin derivative that itself did not cause strand breaks, excision repair in L929 cells is severely inhibited at a stage beyond the incision step.
authors.affiliation: Department of Medical Biochemistry, Sylvius Laboratories, University of Leiden, The Netherlands.
authors.forename: J P
authors.initials: JP
authors.lastname: Boegheim
authors.forename: T M
authors.initials: TM
authors.lastname: Dubbelman
authors.forename: L H
authors.initials: LH
authors.lastname: Mullenders
authors.forename: J
authors.initials: J
authors.lastname: Van Steveninck
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D004247:DNA / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D004260:DNA Repair / Q000187:drug effects*; D005347:Fibroblasts / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D017324:Hematoporphyrin Derivative; D006415:Hematoporphyrins / Q000494:pharmacology*; D007700:Kinetics; D008741:Methyl Methanesulfonate / Q000494:pharmacology; D051379:Mice; D011838:Radiation-Sensitizing Agents / Q000494:pharmacology*; D014466:Ultraviolet Rays
chemical_list: D006415:Hematoporphyrins; D011838:Radiation-Sensitizing Agents; D017324:Hematoporphyrin Derivative; D004247:DNA; D008741:Methyl Methanesulfonate