Aldrin epoxidation in flathead mullet (Mugil cephalus): possible involvement of CYP1A and CYP3A.
The primary objective of this study was to determine specific cytochrome P450 isozyme(s) involved in the metabolism of aldrin to its toxic metabolite dieldrin in flathead mullet (Mugil cephalus) liver microsomes. To identify the cytochrome P450 isozyme responsible for the aldrin metabolism in mullet liver, the effects of mammalian-specific cytochrome P450 inhibitors and substrates were determined in the epoxidation reaction of aldrin. CYP3A-related inhibitors, ketoconazole, SKF-525A, and cimetidine, inhibited the metabolism of aldrin. The contribution of CYP1A to the aldrin metabolism was shown by the inhibition of 7-ethoxyresorufin-O-deethylase activity in the presence of aldrin. The results indicate that CY1A and CYP3A are the cytochrome P450s involved in aldrin epoxidase activity in mullet. In addition, the suitability of aldrin epoxidase activity for monitoring of environmental pollution was also assessed in the fish samples caught from four different locations of the West Black Sea coast of Turkey.
Department of Chemistry, Abant Izzet Baysal University, Bolu, Turkey. bozcaarmutlu_a@ibu.edu.tr.
Azra
A
Bozcaarmutlu
Sema
S
Turna
Canan
C
Sapmaz
Emel
E
Arinc
Serpil
S
Yenisoy-Karakaş
D000452:Aldrin / Q000378:metabolism*; D000818:Animals; D001571:Benzoflavones / Q000494:pharmacology; D019363:Cytochrome P-450 CYP1A1 / Q000037:antagonists & inhibitors / Q000502:physiology*; D051544:Cytochrome P-450 CYP3A / Q000502:physiology*; D065692:Cytochrome P-450 CYP3A Inhibitors / Q000494:pharmacology; D004852:Epoxy Compounds / Q000378:metabolism; D029941:Fish Proteins / Q000502:physiology*; D008658:Inactivation, Metabolic; D007306:Insecticides / Q000378:metabolism*; D008862:Microsomes, Liver / Q000201:enzymology; D045483:Rivers; D023701:Smegmamorpha / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
D001571:Benzoflavones; D065692:Cytochrome P-450 CYP3A Inhibitors; D004852:Epoxy Compounds; D029941:Fish Proteins; D007306:Insecticides; D014874:Water Pollutants, Chemical; C011512:alpha-naphthoflavone; D019363:Cytochrome P-450 CYP1A1; D051544:Cytochrome P-450 CYP3A; D000452:Aldrin
Aldrin; Black Sea; CYP1A; CYP3A; Flathead Mullet (Mugil cephalus)