NDLI: The endocrine effects of dietary brominated diphenyl ether-47 exposure, measured across multiple levels of biological organization, in breeding fathead minnows.

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The endocrine effects of dietary brominated diphenyl ether-47 exposure, measured across multiple levels of biological organization, in breeding fathead minnows.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Thornton, Leah M. Path, Elise M. Venables, Barney J. Sellin Jeffries, Marlo K.
Description	Country affiliation: United States Author Affiliation: Thornton LM ( Department of Biology, Texas Christian University, Fort Worth, Texas, USA.); Path EM ( Department of Biology, Texas Christian University, Fort Worth, Texas, USA.); Venables BJ ( Department of Biological Sciences, University of North Texas, Denton, Texas, USA.); Sellin Jeffries MK ( Department of Biology, Texas Christian University, Fort Worth, Texas, USA.)
Abstract	The goal of the present study was to evaluate the reproductive function of fathead minnows (Pimephales promelas) exposed to brominated diphenyl ether-47 (BDE-47) at doses lower than those used in previous studies. This was accomplished by evaluating the impacts of BDE-47 exposures across multiple levels of biological organization. Breeding pairs were exposed to BDE-47 via diet for 21 d, during which reproductive success was monitored. At the conclusion of the exposure, fish were euthanized to assess the effects of BDE-47 on sex steroid-related and thyroid-related transcripts, plasma androgen levels, gonadosomatic index (GSI), and secondary sexual characteristics. Several alterations in gene expression were noted including a >2.1-fold decrease in hepatic estrogen receptor (er ) and a 2.9-fold decrease in ovarian aromatase (arom). In addition, BDE-47-exposed males experienced increases in deiodinase 2 (dio2) expression in brain tissue (â¼1.5-fold) and decreases in hepatic transthyretin (ttr) expression (â¼1.4-fold). Together, these gene expression alterations suggest the potential for BDE-47 to disrupt endocrine signaling. There were no significant differences in plasma hormone levels, GSI, secondary sexual characteristics, or reproductive success. Overall, the present study demonstrates that exposure to BDE-47 is capable of altering both sex steroid-related and thyroid-related transcripts but that these observed alterations do not necessarily manifest themselves at higher levels of biological organization for the endpoints selected. Environ Toxicol Chem 2016;35:2048-2057. © 2016 SETAC.
File Format	HTM / HTML
ISSN	07307268
Issue Number	8
Journal	Environmental Toxicology and Chemistry
Volume Number	35
e-ISSN	15528618
Language	English
Publisher	Wiley
Publisher Date	2016-08-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Health Discipline Toxicology Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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