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Behavior Alterations and Expression of Estrogen Receptors in Mice Exposed to Bisphenol A  

Seoung Min Jae (충북대학교 약학대학)
Shin Im Cheol (충북대학교 약학대학)
Lee Yoot Mo (충북대학교 약학대학)
Son Dong Ju (충북대학교 약학대학)
Song Youn Sook (충북대학교 약학대학)
Jeon Kei Hyun (충북대학교 약학대학)
Kim Yun Bae (충북대학교 수의과대학)
Lee Beum Jun (충북대학교 수의과대학)
Kim Dae Joong (충북대학교 수의과대학)
Yun Young Won (충북대학교 수의과대학)
Kim Tae Seong (식품의약품안전청)
Han Soon Young (식품의약품안전청)
Song Suk Gil (충북대학교 약학대학)
Publication Information
Toxicological Research / v.20, no.3, 2004 , pp. 251-261 More about this Journal
Abstract
A large number of chemical pollutants including phthalates, alkylphenolic compounds and organochlorine pesticides have the ability to disrupt endocrine function in animals, and alter cog-nitive function. Because hormone mediated events play an important role in central nervous system development and function, the changes in cognitive function seem to be mediated by the endocrine-like action of these chemicals. The present study therefore was designed to investigate effect of bisphenol A (BPA), an endocrine disrupting chemical on neuro-behavial patterns, and expression of estrogen receptors and tyrosine hydroxylase, a limiting enzyme of dopamine synthesis pathway. BPA was treated orally for 3 weeks into 3 week old mice, and then the neuro-behavial patterns (stereo-type behaviors such as jumping rearing and forepaw tremor, climbing behavior, tail flick, rotarod and locomotor activity), and the expression of estrogen receptors and tyrosine hydroxylase were deter-mined every 3 week for 9 weeks. During the treatment of BPA, the food uptake and body weight increase were not significantly changed. BPA resulted in the increased stereotype behaviors (jump-ing, rearing and forepaw tremor) 6 or 9 weeks after treatment. The time response to tail flick and locomotor activity were decreased by the treatment of BPA, whereas the time for rotarod was increased by the treatment of BPA. The expression of estrogen receptor alpha and beta was increased in the brain and pituitary gland. Maximum expression was found in the brain after 9 week of 100 mg/kg BPA treatment and in the pituitary gland after 6 week of 100 mg/kg BPA treatment. Tyrosine hydroxylase was increased in dose and time dependent manners in the brain but no change was found in the pituitary gland. The present data show that exposure of BPA in the young mice could alter expression of estrogen receptors and dopamine synthesis pathway, thereby modulate neuro-behavial patterns (increase of stereotype behaviors but decrease locomotor activity).
Keywords
Bisphenol A; Behavior alterations; Estrogen receptors; Tyrosine hydroxylase;
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