title: Excision repair by human fibroblasts of DNA damaged by r-7, t-8-dihyroxy-t-9,10-oxy-7,8,9,10- tetrahydrobenzo(a)pyrene.
abstract: Benzo(a)pyrene diol-epoxide I (r-7,t-8,dihydroxy-t-9,10 oxy-7,8,9,10 tetrahydrobenzo(a)pyrene) was used to treat either human adenovirus 5 or cultures of human fibroblasts. The survival of diol-epoxide I treated adenovirus was greater when infecting fibroblasts from normal persons than when infecting fibroblasts from patients with xeroderma pigmentosum (XP). One diol-epoxide I molecule bound per viral genome correlated with one lethal hit as measured using XP fibroblasts. Normal fibroblasts blocked in semi-conservative DNA synthesis incorporated into their DNA more [3H]thymidine in response to diol-epoxide I treatment than did XP fibroblasts, and also excised more diol-epoxide I from their DNA. All of the effects described above were similar to those obtained when the inactivating agent was ultraviolet light rather than benzo(a)pyrene diol-epoxide I.
mesh_terms: D000260:Adenoviruses, Human / Q000187:drug effects / Q000235:genetics / Q000528:radiation effects; D001580:Benzopyrenes / Q000494:pharmacology*; D002478:Cells, Cultured; D004247:DNA / Q000096:biosynthesis; D004260:DNA Repair; D004279:DNA, Viral / Q000096:biosynthesis; D005347:Fibroblasts; D006801:Humans; D014466:Ultraviolet Rays; D014983:Xeroderma Pigmentosum / Q000473:pathology
chemical_list: D001580:Benzopyrenes; D004279:DNA, Viral; D004247:DNA