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Role of AHR2 in the expression of novel cytochrome P450 1 family genes, cell cycle genes, and morphological defects in developing zebra fish exposed to 3,3′,4,4′,5-pentachlorobiphenyl or 2,3,7,8-tetrachlorodibenzo- p -dioxin
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Physiology and Developmental Biology, Environmental Toxicology.
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2007 (English)In: Toxicological Sciences, ISSN 1096-6080, E-ISSN 1096-0929, Vol. 100, no 1, 180-193 p.Article in journal (Refereed) Published
Abstract [en]

Halogenated agonists for the aryl hydrocarbon receptor (AHR), such as 3,3',4,4',5-pentachlorobiphenyl (PCB126) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), cause developmental toxicity in fish. AHR dependence of these effects is known for TCDD but only presumed for PCB126, and the AHR-regulated genes involved are known only in part. We defined the role of AHR in regulation of four cytochrome P450 1 (CYP1) genes and the effect of PCB126 on cell cycle genes (i.e., PCNA and cyclin E) in zebra fish (Danio rerio) embryos. Basal and PCB126-induced expression of CYP1A, CYP1B1, CYP1C1, and CYP1C2 was examined over time as well as in relation to cell cycle gene expression and morphological effects of PCB126 in developing zebra fish. The four CYP1 genes differed in the time for maximal basal and induced expression, i.e., CYP1B1 peaked within 2 days postfertilization (dpf), the CYP1Cs around hatching (3 dpf), and CYP1A after hatching (14–21 dpf). These results indicate developmental periods when the CYP1s may play physiological roles. PCB126 (0.3–100nM) caused concentration-dependent CYP1 gene induction (EC50: 1.4–2.7nM, Lowest observed effect concentration [LOEC]: 0.3–1nM) and pericardial edema (EC50: 4.4nM, LOEC: 3nM) in 3-dpf embryos. Blockage of AHR2 translation significantly inhibited these effects of PCB126 and TCDD. PCNA gene expression was reduced by PCB126 in a concentration-dependent manner, suggesting that PCB126 could suppress cell proliferation. Our results indicate that the four CYP1 genes examined are regulated by AHR2 and that the effect of PCB126 on morphology in zebra fish embryos is AHR2 dependent. Moreover, the developmental patterns of expression and induction suggest that CYP1 enzymes could function in normal development and in developmental toxicity of PCB126 in fish embryos.

Place, publisher, year, edition, pages
2007. Vol. 100, no 1, 180-193 p.
Keyword [en]
cytochrome P450 1 (CYP1); 3, 3', 4, 4', 5-pentachlorobiphenyl (PCB126); 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD); embryotoxicity, aryl hydrocarbon receptor (AHR), PCNA.
National Category
Biological Sciences
URN: urn:nbn:se:uu:diva-14340DOI: 10.1093/toxsci/kfm207ISI: 000250686600021PubMedID: 17686920OAI: oai:DiVA.org:uu-14340DiVA: diva2:42110
Available from: 2008-05-15 Created: 2008-05-15 Last updated: 2011-01-18Bibliographically approved

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