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The effects of estradiol (EDP) and human chorionic gonadotropin (HCG) on   histological and stereological features of adrenocorticotropic (ACTH) cells   in peripubertal female rats were examined. The first group of females   received five injections of EDP (0.25 mg/kg b.w.), every second day from the   4th to 14th day after birth, and was killed at the peripubertal stage. The   second group of females was given two injections of pregnyl-gonadotrophinum   chorionicum (HCG; 50 IU/kg body weight) on the 36th and 37th days after   birth, and it was killed 24 h after the last treatment. The controls were   injected with an equivalent volume of the corresponding vehicle. ACTH cells   were immunohistochemically labeled and stereologically evaluated.   Stereological analysis showed that the volume of ACTH cells and their volume   density in peripubertal females treated with EDP, were decreased by 15.6% and   53.8% (p<0.05), respectively, compared to the controls. In HCG-treated   animals, the observed parameters were increased by 39.2% and 15.4% (p<0.05),   respectively, in comparison with the control females. These findings suggest   that the application of EDP or HCG exerted opposite effects on the   stereological features of pituitary ACTH cells. [Projekat Ministarstva nauke   Republike Srbije, br. ON 173009

The effects of estradiol and human chorionic gonadotropin on ACHT cells in peripubertal female rats: A histological and stereological study