title: Chronic exposure to environmental levels of tribromophenol impairs zebrafish reproduction.
abstract: Tribromophenol (2,4,6-TBP) is ubiquitously found in aquatic environments and biota. In this study, we exposed zebrafish embryos (F(0); 2"" days post-fertilization, dpf) to environmental concentration (0.3 microg/L) and a higher concentration (3.0 microg/L) of TBP and assessed the impact of chronic exposure (120 dpf) on reproduction. TBP exposure did not cause a significant increase in the malformation and reduction in the survival in the F(0)-generation fish. After TBP exposure, the plasma testosterone and estradiol levels significantly increased in males and decreased in females. The transcription of steroidogenic genes (3beta-HSD, 17beta-HSD, CYP17, CYP19A, CYP19B) was significantly upregulated in the brain and testes in males and downregulated in the brain and ovary in females. TBP exposure significantly downregulated and upregulated the expression of VTG in the liver of female and male fish, respectively. Meanwhile, TBP exposure altered the sex ratio toward a male-dominant state. The F(1)-generation larvae exhibited increased malformation, reduced survival, and retarded growth, suggesting that TBP in the aquatic environment has significant adverse effects on fish population.
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Deng
authors.forename: Chunsheng
authors.initials: C
authors.lastname: Liu
authors.forename: Liqin
authors.initials: L
authors.lastname: Yu
authors.forename: Bingsheng
authors.initials: B
authors.lastname: Zhou
mesh_terms: D000818:Animals; D003577:Cytochrome P-450 Enzyme System; D004305:Dose-Response Relationship, Drug; D004958:Estradiol / Q000097:blood; D005260:Female; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000502:physiology; D008297:Male; D010636:Phenols / Q000633:toxicity*; D012098:Reproduction / Q000187:drug effects*; D013739:Testosterone / Q000097:blood / Q000235:genetics / Q000378:metabolism; D014819:Vitellogenins / Q000235:genetics / Q000378:metabolism; D014874:Water Pollutants, Chemical; D015027:Zebrafish
chemical_list: D010636:Phenols; D014819:Vitellogenins; D014874:Water Pollutants, Chemical; D013739:Testosterone; D004958:Estradiol; D003577:Cytochrome P-450 Enzyme System; C004554:2,4,6-tribromophenol