Małgorzata Grzesiak podpisana: Małgorzata Durlej

The following study was undertaken to localize androgen receptors (ARs) in various structures of the porcine ovary after prenatal exposure to antiandrogen flutamide. In wet. treatment by antiandrogens may have adverse effects on reproductive function in immature and adult animals. Flutamide was injected into pregnant swines between days 20 and 28 (GD20) or 80 to 88 (GD80) of gestation. The ovaries were collected from treated animals and from control ones (non-treated) at two different points of development: from immature and adult pigs. Immunoexpression of AR was determined for preantral and antral follicles and for stroma cells. Immunostaining showed that AR expression in immature animals was unaffected in the primary follicles, while in the preantral and antral follicles the AR level fluctuated depending on day of treatment as well as on analyzed tissue. In adult animals, the immunoexpression of AR slightly decreased in antral follicles independently on the day of flutamide treatment. Therefore. AR expression in postnatal life may be affected by in utero exposure to antiandrogen flutamide.