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Abstract

Arsenic (As) and mercury (Hg) are ubiquitous elements known to disrupt thyroid function in vertebrates. To explore the underlying mechanisms of Hg and As on the fish thyroid system, we investigated the associations between muscle concentrations of Hg and As with thyroid-related gene transcription in flathead (Platycephalus bassensis) from a contaminated estuary. We sampled fish at several sites to determine the hepatic expression of genes including deiodinases (D1 and D2), transthyretin (TTR), thyroid hormone receptors (TRα and TRβ) and related them to Hg and As levels in the same individuals. Negative correlations were observed between Hg levels and D2, TTR, TRα and TRβ, whereas positive associations were found between As concentrations and TTR and TRβ. These results suggest that Hg and As exposures from environmental pollution affect the regulation of genes important for normal thyroid function in fish. These thyroid-related genes could be used as biomarkers for monitoring environmental thyroid-hormone disrupting chemicals.

Item Type:	Article
Authors/Creators:	Fu, D and Leef, M and Nowak, B and Bridle, A
Keywords:	thyroid-related genes, mercury, arsenic, biomarker, fish
Journal or Publication Title:	Ecotoxicology
Publisher:	Kluwer Academic Publ
ISSN:	0963-9292
DOI / ID Number:	10.1007/s10646-017-1793-4
Copyright Information:	Copyright 2017 Springer Science+Business Media New York
Related URLs:	UTAS Profile: Leef, M UTAS Profile: Nowak, B Google Scholar: Bridle, A UTAS Profile: Bridle, A
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