Developmental programming: prenatal androgen excess disrupts ovarian steroid receptor balance

ORTEGA HH; SALVETTI NR; PADMANABHAN V

REPRODUCTION

BIOSCIENTIFICA LTD

Lugar: Cambridge; Año: 2009 vol. 137 p. 865 - 877

1470-1626

Steroid hormones play an important role in reproduction and the receptors through which they signal change in a developmental time, follicle stage, and cell-specific manner. Disruption in steroid receptor expression affects follicle formation and differentiation. In this study, using prenatal testosterone (T) and dihydrotestosterone (DHT)-treated female sheep as model systems we tested the hypothesis that prenatal androgen excess disrupts the developmental ontogeny of ovarian steroid receptor protein expression. Pregnant Suffolk ewes were injected twice weekly with T propionate or DHT propionate (a non-aromatizable androgen) in cottonseed oil from day 30 to 90 of gestation. Changes in ovarian estrogen receptors (ERa, ERb), androgen receptor (AR) and progesterone receptor (PR) proteins were determined at fetal (day 90 and 140), postpubertal (10 months) and adult (21 months; only prenatal T-treated sheep studied) ages by immunohistochemistry. Prenatal T and DHT treatment induced selective increase in AR but not ER or PR expression in the stroma and granulosa cells of fetal day 90 and 140 ovaries. An increase in ERa and decrease in ERb immunostaining coupled with increased AR expression were evident in granulosa cells of antral follicles of 10 and 21-month old prenatal T but not DHT-treated females (analyzed only at 10 months). These findings provide evidence that an early increase in ovarian AR is the first step in the altered ovarian developmental trajectory of prenatal T-treated females and manifestation of postnatal ovarian dysfunction are likely facilitated via altered equilibrium of antral follicular granulosa cell ER / AR protein expression.