title: Neonatal exposure to xenoestrogens impairs the ovarian response to gonadotropin treatment in lambs.
abstract: Bisphenol A (BPA) and diethylstilbestrol (DES) are xenoestrogens, which have been associated with altered effects on reproduction. We hypothesized that neonatal xenoestrogen exposure affects the ovarian functionality in lambs. Thus, we evaluated the ovarian response to exogenous ovine FSH (oFSH) administered from postnatal day 30 (PND30) to PND32 in female lambs previously exposed to low doses of DES or BPA (BPA50: 50 μg/kg per day, BPA0.5: 0.5 μg/kg per day) from PND1 to PND14. We determined: i) follicular growth, ii) circulating levels of 17β-estradiol (E2), iii) steroid receptors (estrogen receptor alpha, estrogen receptor beta, and androgen receptor (AR)) and atresia, and iv) mRNA expression levels of the ovarian bone morphogenetic protein (BMPs) system (BMP6, BMP15, BMPR1B, and GDF9) and FSH receptor (FSHR). Lambs neonatally exposed to DES or BPA showed an impaired ovarian response to oFSH with a lower number of follicles ≥2 mm in diameter together with a lower number of atretic follicles and no increase in E2 serum levels in response to oFSH treatment. In addition, AR induction by oFSH was disrupted in granulosa and theca cells of lambs exposed to DES or BPA. An increase in GDF9 mRNA expression levels was observed in oFSH-primed lambs previously treated with DES or BPA50. In contrast, a decrease in BMPR1B was observed in BPA0.5-postnatally exposed lambs. The modifications in AR, GDF9, and BMPR1B may be associated with the altered ovarian function due to neonatal xenoestrogen exposure in response to an exogenous gonadotropin stimulus. These alterations may be the pathophysiological basis of subfertility syndrome in adulthood.
authors.affiliation: Facultad de Ciencias AgrariasUniversidad Nacional de Lomas de Zamora, Buenos Aires, ArgentinaFacultad de Bioquímica y Ciencias BiológicasInstituto de Salud y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina.
authors.forename: Oscar E
authors.initials: OE
authors.lastname: Rivera
authors.affiliation: Facultad de Ciencias AgrariasUniversidad Nacional de Lomas de Zamora, Buenos Aires, ArgentinaFacultad de Bioquímica y Ciencias BiológicasInstituto de Salud y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina.
authors.forename: Jorgelina
authors.initials: J
authors.lastname: Varayoud
authors.affiliation: Facultad de Ciencias AgrariasUniversidad Nacional de Lomas de Zamora, Buenos Aires, ArgentinaFacultad de Bioquímica y Ciencias BiológicasInstituto de Salud y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina.
authors.forename: Horacio A
authors.initials: HA
authors.lastname: Rodríguez
authors.affiliation: Facultad de Ciencias AgrariasUniversidad Nacional de Lomas de Zamora, Buenos Aires, ArgentinaFacultad de Bioquímica y Ciencias BiológicasInstituto de Salud y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina.
authors.forename: Clarisa G
authors.initials: CG
authors.lastname: Santamaría
authors.affiliation: Facultad de Ciencias AgrariasUniversidad Nacional de Lomas de Zamora, Buenos Aires, ArgentinaFacultad de Bioquímica y Ciencias BiológicasInstituto de Salud y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina.
authors.forename: Verónica L
authors.initials: VL
authors.lastname: Bosquiazzo
authors.affiliation: Facultad de Ciencias AgrariasUniversidad Nacional de Lomas de Zamora, Buenos Aires, ArgentinaFacultad de Bioquímica y Ciencias BiológicasInstituto de Salud y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina.
authors.forename: Mario
authors.initials: M
authors.lastname: Osti
authors.affiliation: Facultad de Ciencias AgrariasUniversidad Nacional de Lomas de Zamora, Buenos Aires, ArgentinaFacultad de Bioquímica y Ciencias BiológicasInstituto de Salud y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina.
authors.forename: Norberto M
authors.initials: NM
authors.lastname: Belmonte
authors.affiliation: Facultad de Ciencias AgrariasUniversidad Nacional de Lomas de Zamora, Buenos Aires, ArgentinaFacultad de Bioquímica y Ciencias BiológicasInstituto de Salud y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina.
authors.forename: Mónica
authors.initials: M
authors.lastname: Muñoz-de-Toro
authors.affiliation: Facultad de Ciencias AgrariasUniversidad Nacional de Lomas de Zamora, Buenos Aires, ArgentinaFacultad de Bioquímica y Ciencias BiológicasInstituto de Salud y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral, Casilla de Correo 242, 3000 Santa Fe, Argentina eluque@fbcb.unl.edu.ar.
authors.forename: Enrique H
authors.initials: EH
authors.lastname: Luque
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001559:Benzhydryl Compounds / Q000494:pharmacology*; D004054:Diethylstilbestrol / Q000494:pharmacology*; D052244:Endocrine Disruptors / Q000494:pharmacology*; D047628:Estrogen Receptor alpha / Q000378:metabolism; D047629:Estrogen Receptor beta / Q000378:metabolism; D005260:Female; D005640:Follicle Stimulating Hormone / Q000494:pharmacology; D010053:Ovary / Q000187:drug effects* / Q000378:metabolism; D010636:Phenols / Q000494:pharmacology*; D011944:Receptors, Androgen / Q000378:metabolism; D012756:Sheep; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D004054:Diethylstilbestrol; D052244:Endocrine Disruptors; D047628:Estrogen Receptor alpha; D047629:Estrogen Receptor beta; D005640:Follicle Stimulating Hormone; D010636:Phenols; D011944:Receptors, Androgen; C006780:bisphenol A; D000098826:Bisphenol A Compounds