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Effects of in ovo exposure of white leghorn chicken, common pheasant, and Japanese quail to 2,3,7,8‐tetrachlorodibenzo‐ p ‐dioxin and two chlorinated dibenzofurans on CYP1A induction
Author(s) -
Yang Yinfei,
Wiseman Steve,
CohenBarnhouse Andrew M.,
Wan Yi,
Jones Paul D.,
Newsted John L.,
Kay Denise P.,
Kennedy Sean W.,
Zwiernik Matthew J.,
Bursian Steven J.,
Giesy John P.
Publication year - 2010
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.171
Subject(s) - quail , pheasant , polychlorinated dibenzodioxins , aryl hydrocarbon receptor , polychlorinated dibenzofurans , bioassay , messenger rna , chemistry , cytochrome p450 , medicine , biology , endocrinology , biochemistry , enzyme , zoology , environmental chemistry , ecology , gene , transcription factor
Abstract In birds, activation of the aryl hydrocarbon receptor (AhR) by some polychlorinated dibenzo‐ p ‐dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) results in induction of cytochrome P4501A ( CYP1A ) expression. This response has been useful for predicting relative sensitivity of birds to dioxin‐like compounds. To further investigate species‐sensitivity to dioxins and dioxin‐like compounds induction of cytochrome P450 1A4 and 1A5 ( CYP1A4 and CYP1A5 ) mRNA and ethoxyresorufin O ‐deethylase (EROD) activity were quantified in liver of posthatch white leghorn chicken, common pheasant, and Japanese quail exposed to 2,3,7,8‐tetrachlorodibenzo‐ p ‐dioxin (TCDD), 2,3,4,7,8‐pentachlorodibenzofuran (PeCDF), or 2,3,7,8‐tetrachlorodibenzofuran (TCDF) via air cell injection. The rank‐order of sensitivity of TCDD‐ and TCDF‐exposed birds, based on CYP1A , was chicken > pheasant > quail. Based on CYP1A5 mRNA expression and EROD induction, the order of sensitivity of PeCDF‐exposed birds was identical to that for TCDD and TCDF. However, based on CYP1A4 mRNA expression the rank‐order was pheasant > chicken > quail. When comparing the potency of the three compounds in each species, based on CYP1A4 mRNA expression, TCDD was the most potent compound in chicken. However, PeCDF was equally potent to TCDD in quail and was more potent than TCDD in pheasant. These results suggest that quantitative real‐time polymerase chain reaction (Q‐PCR) analysis of CYP1A expression, particularly CYP1A4 mRNA expression, may be a more sensitive biomarker of exposure than analysis of EROD induction, especially in less responsive avian species. Based on these findings future risk assessments should consider the sensitivity of the species inhabiting a site and the congeners of concern that are present. Environ. Toxicol. Chem. 2010;29:1490–1502. © 2010 SETAC