Catecholestrogens and release of anterior pituitary gland hormones. II. Prolactin.
We investigated the effects of the peripheral administration of 17 beta-estradiol (E2), estrone (E1), and the catecholestrogens, 2-hydroxyestradiol (2-OHE2) and 2-hydroxyestrone, (2-OHE1), on anterior pituitary gland PRL release in the prepuberal rat. Steroids in oil were injected sc into 25-day-old female and 35- to 40-day-old male rats. The injection of E2, E1, or 2-OHE2, but not of 2-OHE, caused a surge in serum PRL levels in female rats 48 h later, during the afternoon hours. Only E1 induced a PRL surge 24 h after injection. In male rats, the injection of E1 or 2-OHE2, but not of 2-OHE1, elevated serum PRL levels on a chronic basis. The results suggest that 2-OHE1 plays no discernible role in PRL release in either sex, but that 2-OHE2 might play a role in the tonic release of PRL in the male and in the preovulatory release of PRL in the female.
D000818:Animals; D004958:Estradiol / Q000031:analogs & derivatives / Q000494:pharmacology; D002393:Estrogens, Catechol / Q000494:pharmacology*; D004970:Estrone / Q000494:pharmacology; D005260:Female; D006894:Hydroxyestrones / Q000494:pharmacology; D008297:Male; D011388:Prolactin / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D011954:Receptors, Dopamine / Q000187:drug effects; D012741:Sexual Maturation
D002393:Estrogens, Catechol; D006894:Hydroxyestrones; D011954:Receptors, Dopamine; D004970:Estrone; D004958:Estradiol; D011388:Prolactin; C001390:2-hydroxyestradiol; C024980:2-hydroxyestrone