title: Formation and persistence of DNA adducts in the liver of brown bullheads exposed to benzo[a]pyrene.
abstract: The formation and persistence of benzo[a]pyrene (BP)-DNA adducts in the liver of brown bullheads (Ictalurus nebulosus) treated with the hydrocarbon (20 mg/kg body wt, i.p.) was investigated using the 32P-postlabeling assay. The highest level of covalent binding of BP to liver DNA (188 fmol BP adducts/mg DNA) was observed 25-30 days following treatment. After 70 days, the adduct level in liver DNA had declined to approximately 26% of the maximum adduct level. One major BP-DNA adduct and several minor ones were detected in the liver. The major adduct co-chromatographed with anti-BP-7,8-diol-9,10-epoxide-deoxyguanosine (anti-BPDE-dGuo) adduct. The data suggest that brown bullheads metabolically activate BP by the same mechanism as the mammalian systems susceptible to carcinogenic effects of the hydrocarbon.
authors.affiliation: Great Lakes Laboratory, State University of New York College of Buffalo 14222.
authors.forename: H C
authors.initials: HC
authors.lastname: Sikka
authors.forename: J P
authors.initials: JP
authors.lastname: Rutkowski
authors.forename: C
authors.initials: C
authors.lastname: Kandaswami
authors.forename: S
authors.initials: S
authors.lastname: Kumar
authors.forename: K
authors.initials: K
authors.lastname: Earley
authors.forename: R C
authors.initials: RC
authors.lastname: Gupta
mesh_terms: D015123:7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxide / Q000032:analysis; D000818:Animals; D001564:Benzo(a)pyrene / Q000378:metabolism*; D001711:Biotransformation; D002397:Catfishes / Q000378:metabolism*; D004247:DNA / Q000032:analysis / Q000378:metabolism*; D018736:DNA Adducts; D007059:Ictaluridae / Q000378:metabolism*; D008099:Liver / Q000378:metabolism*
chemical_list: D018736:DNA Adducts; C043931:benzo(a)pyrene-7,8-dihydrodiol-9,10-epoxide-DNA; D001564:Benzo(a)pyrene; D015123:7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxide; D004247:DNA