Prenatal Bisphenol A exposure delays the development of the male rat mammary gland

L KASS; M DURANDO; GA ALTAMIRANO; GE MANFRONI GHIBAUDO; EH LUQUE; M MUÑOZ-DE-TORO

REPRODUCTIVE TOXICOLOGY (ELMSFORD, N.Y.)

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Elmsford; Año: 2015 vol. 54 p. 37 - 46

0890-6238

Our aims were to evaluate whether exposure to Bisphenol A (BPA) modifies the development of the male rat mammary gland (MG) and to evaluate whether this modification is gender specific. From gestational day 9, pregnant rats were exposed either subcutaneously to 0, 25 or 250µg BPA/kgbw/day until parturition or orally to 0 and 64µg BPA/kgbw/day until weaning. MG development was analyzed on postnatal days (PND) 5, 15 and 30. On PND30, steroid hormone receptor expression and mammary growth were also evaluated. On PND30, the exposure to 64BPA and 250BPA induced a delay in male MG development, evidenced by reduced ductal growth, decreased number of terminal structures and lower expression of androgen receptor (AR). In contrast, female mammary ductal growth was altered only by 250BPA. Regardless of the administration route and length of the exposure period, BPA induced a delay in MG development and modified AR expression in prepubertal male rats.