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Biotransformation enzymes of xenobiotics (ethoxyresorufin-O-deethylase,   cytochrome P4501A1 content and glutathione-S-transferase) were investigated   in the liver of Persian Sturgeon (Acipenser persicus) after a 96-hour   exposure to polycyclic aromatic hydrocarbons (PAHs), premutagenic   benzo[a]pyrene (BaP) and beta-naphthoflavone (BNF). The fish were injected 10   mg/kg wet-body weight in corn oil for 96 hours every days.   Ethoxyresorufin-O-deethylase activity (EROD) and glutathione s-transferase   activity (GST) were measured in the fish liver. Cytochrome P4501A1 (CYP1A1)   content was estimated by indirect enzyme-linked immunosorbent assay (ELISA).   The response appeared as early as 12 hours post exposure. A time-dependent   response was observed in the EROD activity, being significantly higher at 48   hours post exposure to 10 mg/kg of BaP. The greatest induction occurred in   the fish treated with 10 mg/kg BaP, in which a 32.1- fold increase in EROD   activity was observed. Results showed that EROD activity in A. persicus is   significantly increased by BaP and BNF treatments. Both chemicals showed   higher values of EROD activity compared to the liver CYP1A content. There was   a rise in glutathione-S-transferase activity in fish exposed to BNF, but no   increase was observed in fish treated with BaP. The results showed that   hepatic CYP1A expression in terms of induction of EROD activity might be   suited as a biomarker of organic contamination in aquatic environments and   led to lower sensitivity of the second phase in the detoxification enzyme

Biomarker responses in persian sturgeon (Acipenser persicus) exposed to benzo-a-pyrene and beta-naphthoflavone