title: Organ-specific differences in 8-oxoguanosine glycosylase (OGG1) repair following acute treatment with benzo[a]pyrene.
abstract: The lung has been shown to be a target organ for the deleterious effects of Benzo[a]pyrene (B[a]P), regardless of the route of exposure. 8-hydroxy-2'-deoxyguanosine (oxo8dG) is a mutagenic lesion formed in DNA following exposure to B[a]P. The objective of this study was to determine the capacity of different organs to repair oxo8dG following intraperitoneal (i.p.) treatment with B[a]P. Male Spraque-Dawley rats were administered 20 mg/kg B[a]P i.p., 2 times/day for 5 days. A 26% decrease in the capacity to remove oxo8dG was observed in lung tissue at 72 hours and recovered 20% above control values at 120 hours. The capacity of the liver and kidney remained at baseline for all time points analyzed. A 7-fold increase in oxo8dG was observed in the lung at 72 hours. This study demonstrates that organ-specific differences exist in the capacity to remove oxo8dG and further demonstrates the susceptibility of lung tissue to the effects of B[a]P.
authors.affiliation: Dept. of Neurology, College of Medicine, University of South Florida, Tampa, USA.
authors.forename: T
authors.initials: T
authors.lastname: Stedeford
authors.forename: F
authors.initials: F
authors.lastname: Cardozo-Pelaez
authors.forename: C
authors.initials: C
authors.lastname: Hover
authors.forename: R D
authors.initials: RD
authors.lastname: Harbison
authors.forename: J
authors.initials: J
authors.lastname: Sanchez-Ramos
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D000818:Animals; D001564:Benzo(a)pyrene / Q000633:toxicity*; D015153:Blotting, Western; D002273:Carcinogens / Q000633:toxicity*; D004247:DNA / Q000302:isolation & purification; D004260:DNA Repair / Q000187:drug effects; D043382:DNA-Formamidopyrimidine Glycosylase; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000378:metabolism; D007668:Kidney / Q000187:drug effects / Q000378:metabolism; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008168:Lung / Q000187:drug effects / Q000378:metabolism; D008297:Male; D009699:N-Glycosyl Hydrolases / Q000378:metabolism*; D009928:Organ Specificity; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D002273:Carcinogens; D001564:Benzo(a)pyrene; D000080242:8-Hydroxy-2'-Deoxyguanosine; D004247:DNA; D009699:N-Glycosyl Hydrolases; D043382:DNA-Formamidopyrimidine Glycosylase; D003849:Deoxyguanosine