Bioconcentration and metabolism of decabromodiphenyl ether (BDE-209) result in thyroid endocrine disruption in zebrafish larvae

Chen, Qi; Yu, Liqin; Yang, Lihua; Zhou, Bingsheng

Bioconcentration and metabolism of decabromodiphenyl ether (BDE-209) result in thyroid endocrine disruption in zebrafish larvae

2012

Chen, Qi | Yu, Liqin | Yang, Lihua | Zhou, Bingsheng

Polybrominated diphenyl ethers (PBDEs) have the potential to disturb the thyroid endocrine system, but little is known of such effects or underlying mechanisms of BDE-209 in fish. In the present study, bioconcentration and metabolism of BDE-209 were investigated in zebrafish embryos exposed at concentrations of 0, 0.08, 0.38 and 1.92mg/L in water until 14days post-fertilization (dpf). Chemical analysis revealed that BDE-209 was accumulated in zebrafish larvae, while also metabolic products were detected, including octa- and nona-BDEs, with nona-BDEs being predominant. The exposure resulted in alterations of both triiodothyronine (T3) and thyroxine (T4) levels, indicating thyroid endocrine disruption. Gene transcription in the hypothalamic–pituitary–thyroid (HPT) axis was further examined, and the results showed that the genes encoding corticotrophin-releasing hormone (CRH) and thyroid-stimulating hormone (TSHβ) were transcriptionally significantly up-regulated. Genes involved in thyroid development (Pax8 and Nkx2.1) and synthesis (sodium/iodide symporter, NIS, thyroglobulin, TG) were also transcriptionally up-regulated. Up-regulation of mRNA for thyronine deiodinase (Dio1 and Dio2) and thyroid hormone receptors (TRα and TRβ) was also observed. However, the genes encoding proteins involved in TH transport (transthyretin, TTR) and metabolism (uridinediphosphate-glucuronosyl-transferase, UGT1ab) were transcriptionally significantly down-regulated. Furthermore, protein synthesis of TG was significantly up-regulated, while that of TTR was significantly reduced. These results suggest that the hypothalamic–pituitary–thyroid axis can be evaluated to determine thyroid endocrine disruption by BDE-209 in developing zebrafish larvae.

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AGROVOC Keywords

animals bioaccumulation chemical analysis danio rerio embryology endocrine disruptors gene expression regulation genes genetics hormone receptors iodides larvae messenger rna metabolism protein synthesis rna sodium thyroid gland thyrotropin thyrotropin thyroxine toxicity triiodothyronine triiodothyronine

Bibliographic information

Published in

Aquatic toxicology

Volume 110 Pagination 141 - 148 ISSN 0166-445X

Publisher

Elsevier B.V.

Other Subjects

Water pollutants; Chemical; Zebrafish; Thyroid hormone receptors beta; Endocrine system; Up-regulation; Drug effects; Endocrine system; Thyroglobulin; Halogenated diphenyl ethers; Nonmammalian; Embryo; Iodide peroxidase; Corticotropin-releasing hormone; Polybrominated diphenyl ethers; Prealbumin; Transcription (genetics); Messenger

Language

English

Type

Text; Journal Article

In AGRIS since: 2024-02-28

Format: MODS

Data Provider

This bibliographic record has been provided by National Agricultural Library

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Links

DOI http://dx.doi.org/10.1016/j.aquatox.2012.01.008

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