title: [Ultrastructure of gonadotropic cells of the normal eel and after estradiol injection].
abstract: Male and female silver eels, in fresh water or sea water, have few gonadotrophs (GTH) poorly differentiated. An oestradiol (E2) treatment induces their development: a well developed Golgi area, abundant secretory granules (200-500 nm), dilated cisterna and large globules 1.2-2.2 micron) are observed. A positive feedback may control gonadotropin synthesis in immature eels. No macroscopic effect is discernible on the gonad.
mesh_terms: D000811:Anguilla / Q000033:anatomy & histology*; D000818:Animals; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D007267:Injections; D008297:Male; D010902:Pituitary Gland / Q000187:drug effects / Q000648:ultrastructure*
chemical_list: D004958:Estradiol
vernacular_title: Ultrastructure des cellules gonadotropes de l'anguille normale et après injection d'oestradiol.