title: Characterization of pituitary cell populations in rats with induced polycystic ovaries.
abstract: Several hypotheses have been proposed about the pathogenesis of polycystic ovarian syndrome (PCOS), however, the fundamental physiological interactions that initiate the development of follicular cysts have not yet been elucidated. Hence, in this study the proliferation, density and population of gonadotrophs, mammotrophs, somatotrophs and corticotrophs of the pituitary glands of rats with induced follicular cysts have been investigated by 2 experimental models (continuous light exposition and estradiol valerate-treated rats). Specific immunoreactivity associated with follicle-stimulating hormone, luteinizing hormone, prolactin, growth hormone and adrenocorticotropic hormone was evaluated by immunohistochemistry with specific hormone antibodies and proliferation of secretory cells by their colocalization (double-labeling) with proliferating cell nuclear antigen. The results indicate a reduction in the density and proliferation of gonadotrophs in both experimental groups. A reduction in the average density, proliferation and population of lactotrophs and corticotrophs was also observed in estradiol valerate-treated animals. However, no significant differences were found in somatotrophs. The present study contributes to the information about alterations of some cell populations that occur in the pituitary gland of rats with polycystic ovaries, and will enhance our understanding of the pathogenesis of this disease.
authors: Department of Morphological Sciences, Faculty of Veterinary Sciences, National University of Litoral, Esperanza, Argentina.
authors: Manuela
authors: M
authors: Francou
authors: Mauro
authors: M
authors: Durdos
authors: Natalia R
authors: NR
authors: Salvetti
authors: Celina
authors: C
authors: Baravalle
authors: Florencia
authors: F
authors: Rey
authors: Hugo H
authors: HH
authors: Ortega
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000032:analysis; D000818:Animals; D004958:Estradiol / Q000031:analogs & derivatives; D005260:Female; D005640:Follicle Stimulating Hormone / Q000032:analysis; D007150:Immunohistochemistry; D007986:Luteinizing Hormone / Q000032:analysis; D010053:Ovary / Q000737:chemistry / Q000473:pathology*; D010902:Pituitary Gland / Q000737:chemistry / Q000473:pathology*; D011085:Polycystic Ovary Syndrome / Q000139:chemically induced / Q000378:metabolism / Q000473:pathology*; D011388:Prolactin / Q000032:analysis; D051381:Rats; D017208:Rats, Wistar
chemical_list: D004958:Estradiol; D000324:Adrenocorticotropic Hormone; D011388:Prolactin; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone