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27

Effects of single or 35 days oral exposure of adult Sprague-Dawley rats to p-tert-octylphenol on uterine gene expression


ABSTRACT: Contamination of the environment with endocrine disrupting chemicals (EDCs) has raised concerns about potential health hazards for humans and wildlife. P-tert-octylphenol (OP) is one such ubiquitous chemical reported to bind to the estrogen receptor (ER) and alter expression of estrogen-responsive genes. Human and wildlife exposure to OP are likely, due to its persistence in the environment and its presence in food, water and items of daily use. Detrimental effects of OP exposures on the reproductive system have been observed in some, but not all, in vivo experiments. This study compared estrogenic effects of OP in vitro with those in vivo in adult female rats, attempting to better mimic real-life exposures in adults. In vitro, OP bound to human ER weakly and accelerated proliferation of MCF-7 cells. Adult Sprague-Dawley rats were given OP by gavage either once or daily for 35 days (125 mg/kg body weight). Body and organ weights and ovarian follicle populations were unaltered in OP-exposed adult rats after either time point, despite detectable levels of OP in reproductive organs. Toxicity of OP was demonstrated by a slightly reduced growth rate and slightly altered estrous cycle, but there were no significant estrogen-like changes in histomorphology or microarray analyses of gene expression of uterine tissue. Prepubertal rats exposed by gavage to 125 or 250 mg/kg OP for three days failed to show any uterotrophic effects, although E2 caused a 3-fold increase in uterine weight. Results do not support a dose-dependent, estrogenic mode of action for OP. This SuperSeries is composed of the SubSeries listed below. Overall design: Refer to individual Series

INSTRUMENT(S): INRS-Institut Armand-Frappier Agilent-011868 Rat Oligo Microarray G4130A

SUBMITTER: Patrick J Devine  

PROVIDER: GSE14530 | GEO | 2009-02-20

SECONDARY ACCESSION(S): GSE14527PRJNA111607 GSE14528

REPOSITORIES: GEO

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