title: Anguilla anguilla L. biochemical and genotoxic responses to benzo[a]pyrene.
abstract: Eels (Anguilla anguilla L.) were exposed for 2, 4, 6, 8, 16, 24, 48, 72, 144, and 216 h to 0 (control), 0.3, 0.9, and 2.7 microM benzo[a]pyrene (BaP). The biotransformation induced by BaP was measured as liver ethoxyresorufin O-deethylase (EROD) activity and cytochrome P450 content, and compared with the genotoxic effects, such as erythrocytic nuclear abnormalities (ENA), and blood and liver DNA strand breaks. The liver exhibited a highly significant EROD activity increase from 2 up to 216 h exposure to 0.9 and 2.7 microM BaP, whereas 0.3 microM BaP exposure induced a significant liver EROD increase from 2 up to 144 h. Liver cytochrome P-450 content was significantly increased at 8 h to 2.7 microM BaP exposure. Liver DNA integrity was decreased at 16 h, from 8 up to 144 h and 8 up to 72 h exposure to 0.3, 0.9, and 2.7 microM BaP, respectively. A significant decrease in blood DNA integrity was observed at 48, 72, 144 h, from 8 up to 72, and from 6 up to 72 h exposure to 0.3, 0.9, and 2.7 microM BaP, respectively. The A. anguilla L. genotoxic response to BaP, measured as ENA induction, was significantly increased at 144 h exposure to 0.3 microM BaP. The intermediate BaP concentration tested (0.9 microM) induced a significant three fold ENA increase at 48 and 72 h exposure compared to their controls. The highest BaP concentration (2.7 microM) induced a significant increase in ENA frequency at 72, 144 and 216 h exposure.
authors.forename: V L
authors.initials: VL
authors.lastname: Maria
authors.forename: A C
authors.initials: AC
authors.lastname: Correia
authors.forename: M A
authors.initials: MA
authors.lastname: Santos
mesh_terms: D000811:Anguilla / Q000235:genetics / Q000502:physiology*; D000818:Animals; D001564:Benzo(a)pyrene / Q000378:metabolism / Q000633:toxicity*; D001711:Biotransformation; D002273:Carcinogens / Q000378:metabolism / Q000633:toxicity*; D000013:Congenital Abnormalities / Q000209:etiology / Q000662:veterinary; D019363:Cytochrome P-450 CYP1A1 / Q000494:pharmacology; D003577:Cytochrome P-450 Enzyme System / Q000032:analysis; D004249:DNA Damage / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D004790:Enzyme Induction; D014874:Water Pollutants, Chemical / Q000378:metabolism / Q000633:toxicity*
chemical_list: D002273:Carcinogens; D014874:Water Pollutants, Chemical; D001564:Benzo(a)pyrene; D003577:Cytochrome P-450 Enzyme System; D019363:Cytochrome P-450 CYP1A1