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Reprod Toxicol. 2009 Dec;28(4):435-42. doi: 10.1016/j.reprotox.2009.06.012. Epub 2009 Jul 3.

Neonatal exposure to bisphenol A alters estrogen-dependent mechanisms governing sexual behavior in the adult female rat.

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  • 1Laboratorio de EndocrinologĂ­a y Tumores Hormonodependientes, School of Biochemistry and Biological Sciences, Universidad Nacional del Litoral, Casilla de Correo 242, (3000) Santa Fe, Argentina.

Abstract

This study examines the effects of neonatal exposure to the endocrine disruptor bisphenol A (BPA) on the hypothalamic circuitry controlling the female sexual behaviors of adult rats. From postnatal day 1 (PND1) to PND7, pups were injected with corn oil (control) or BPA (BPA20: 20mg/kg-d; BPA.05: 0.05 mg/kg-d) and at PND85 the rats were bilaterally ovariectomized (OVX). At PND100, OVX-rats received estradiol alone or estradiol and progesterone to evaluate estrogen-dependent gene expression in the hypothalamus and sexual behavior. In BPA-exposed females, estrogen receptor alpha (ER alpha) expression was down-regulated in both the medial preoptic (MPN) and ventromedial nucleus (VMHvl), while repressor of estrogen receptor activity (REA) expression was up-regulated in the VMHvl. Interestingly, BPA-exposed females displayed significantly lower levels of proceptive behavior. Our results show that BPA permanently alters the hypothalamic estrogen-dependent mechanisms that govern sexual behavior in the adult female rat.

PMID:
19577632
[PubMed - indexed for MEDLINE]
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