title: Benzo[a]pyrene diol epoxide induces viral reactivation at concentrations that block DNA elongation in mammalian cells.
abstract: The survival of UV-irradiated Simian virus 40 (SV40) in CV-1P African green monkey kidney cells treated with (+/-)7 beta, 8 alpha-dihydroxy-9 alpha, 10 alpha epoxy-7,8,9,10-tetrahydrobenzo[a]pyrene (BP-diol epoxide I) was studied. Enhanced survival of UV damaged SV40 was detected when CV-1P cells were treated with dose levels of BP-diol epoxide I corresponding to the exponential portion (0.33-1.11 microM) of a CV-1P cell survival curve. Dose levels of BP-diol epoxide I corresponding to the shoulder region (less than or equal to 0.16 microM) of a CV-1P survival curve did not induce viral reactivation. The shoulder region concentrations of BP-diol epoxide I selectively inhibited DNA initiation while the concentrations on the exponential portion of the curve preferentially inhibited DNA elongation. It was shown in a time course of enhanced viral survival at 0.66 microM BP-diol epoxide I that the reactivation response was fully induced by 24 h. In conclusion, the viral reactivation response was associated with concentrations of BP-diol epoxide I which induced lethal damage and preferentially inhibited DNA elongation.
mesh_terms: D000818:Animals; D001580:Benzopyrenes / Q000494:pharmacology*; D002460:Cell Line; D002522:Chlorocebus aethiops; D004261:DNA Replication / Q000187:drug effects*; D005347:Fibroblasts / Q000187:drug effects / Q000378:metabolism; D007668:Kidney; D013539:Simian virus 40 / Q000187:drug effects / Q000502:physiology / Q000528:radiation effects; D014466:Ultraviolet Rays; D014775:Virus Activation / Q000187:drug effects*
chemical_list: D001580:Benzopyrenes; C039385:7,8-dihydroxy-9,10-epoxy-8-methyl-7,8,9,10-tetrahydrobenzo(a)pyrene