Hepatic CYP1A induction by chlorinated dioxins and related compounds in the endangered black-footed albatross from the North Pacific.
The present study assesses effects of dioxins and related compounds (DRCs) including polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans, and dioxin-like polychlorinated biphenyls (DL-PCBs) on cytochrome P450 1A (CYP1A) expression level in liver of black-footed albatrosses (Phoebastria nigripes) collected from the North Pacific. Total 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-T(4)CDD) toxic equivalents (TEQs) derived from toxic equivalency factor for birds proposed by World Health Organization were in the range of 2100 to 10 000 pg/g lipid wt (120-570 pg/g wet wt). Simultaneously, microsomal alkoxyresorufin O-dealkylase (AROD) activities, including methoxy-, ethoxy-, pentoxy-, and benzyloxy-resorufin O-dealkylase activities were also measured in the same specimens. Total TEQs and TEQ (on wet wt basis) from some individual DRC congeners had significant positive correlations with AROD activities, suggesting induction of CYP1A by DRCs. Congeners like 2,3,7,8-T(4)CDD and most of the DL-PCBs that showed no significant positive correlations between the concentrations and AROD activities, exhibited significant negative correlations between AROD activities and the concentration ratio of the congener to a recalcitrant CB169, suggesting preferential metabolism of these congeners by induced CYP1A. As far as we know, this is the first direct evidence revealing that hepatic CYP1A level is elevated with the accumulation of DRCs in the wild black-footed albatross population. The present study gives more robust estimate of impacts of DRCs on CYP1A induction in this rare pelagic species than indexes like hazard quotient and TEQ-threshold comparison that have been so far carried out.
Kubota
Akira
A
Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho, Matsuyama, Japan.
Watanabe
Mafumi
M
Kunisue
Tatsuya
T
Kim
Eun-Young
EY
Tanabe
Shinsuke
S
Iwata
Hisato
H
D000818:Animals; D001572:Benzofurans / Q000737:chemistry; D001717:Birds; D002713:Chlorine / Q000633:toxicity*; D019363:Cytochrome P-450 CYP1A1 / Q000096:biosynthesis*; D004147:Dioxins / Q000737:chemistry / Q000633:toxicity*; D004785:Environmental Pollutants; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008862:Microsomes, Liver / Q000187:drug effects; D018570:Risk Assessment; D014874:Water Pollutants, Chemical / Q000032:analysis
D001572:Benzofurans; D004147:Dioxins; D004785:Environmental Pollutants; D014874:Water Pollutants, Chemical; D002713:Chlorine; C023614:dibenzofuran; D019363:Cytochrome P-450 CYP1A1; C020887:dibenzo(1,4)dioxin