Failure of 2 Hydroxyestradiol to interact with dopamine inhibition of human prolactin secretion in vitro and with dopamine receptors of prolactin-secreting adenomas.
The ability of 2-Hydroxyestradiol, a catecholestrogen, and 17 beta Estradiol to interact with the dopamine inhibition of prolactin and with dopamine receptors has been tested on dispersed human prolactin-secreting cells obtained from ten pituitary adenomas. There is a 80% inhibition of prolactin secretion obtained by addition of dopamine in a superfusion system. This inhibition is not affected by preexposure to the steroids, or by their introduction into the perifusion medium. Moreover 2 Hydroxyestradiol and 17 beta Estradiol do not interact with the binding of 3H Domperidone to DA receptors.
D000236:Adenoma / Q000378:metabolism*; D001667:Binding, Competitive; D018492:Dopamine Antagonists; D004958:Estradiol / Q000031:analogs & derivatives* / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D011388:Prolactin / Q000378:metabolism*; D011954:Receptors, Dopamine / Q000187:drug effects / Q000378:metabolism*
D018492:Dopamine Antagonists; D011954:Receptors, Dopamine; D004958:Estradiol; D011388:Prolactin; C001390:2-hydroxyestradiol