title: Gonadotropin binding sites in human ovarian follicles and corpora lutea during the menstrual cycle.
abstract: Gonadotropin binding sites were localized by autoradiography after incubation of human ovarian sections with 125I-labeled gonadotropins. The binding sites for 125I-labeled human follicle-stimulating hormone (125I-hFSH) were identified in the granulosa cells and in the newly formed corpora lutea. The 125I-labeled human luteinizing hormone (125I-hLH) binding to the thecal cells increased during follicular maturation, and a dramatic increase was preferentially observed in the granulosa cells of the large preovulatory follicle. In the corpora lutea, the binding of 125I-hLH increased from the early luteal phase and decreased toward the late luteal phase. The changes in 3 beta-hydroxysteroid dehydrogenase activity in the corpora lutea corresponded to the 125I-hLH binding. Thus, the changes in gonadotropin binding sites in the follicles and corpora lutea during the menstrual cycle may help in some important way to regulate human ovarian function.
mesh_terms: D015096:3-Hydroxysteroid Dehydrogenases / Q000378:metabolism; D001345:Autoradiography; D003338:Corpus Luteum / Q000378:metabolism*; D005260:Female; D005640:Follicle Stimulating Hormone / Q000378:metabolism; D006801:Humans; D007457:Iodine Radioisotopes; D007986:Luteinizing Hormone / Q000378:metabolism; D008597:Menstrual Cycle; D006080:Ovarian Follicle / Q000378:metabolism*; D011962:Receptors, FSH / Q000378:metabolism*; D011974:Receptors, LH / Q000378:metabolism*
chemical_list: D007457:Iodine Radioisotopes; D011962:Receptors, FSH; D011974:Receptors, LH; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D015096:3-Hydroxysteroid Dehydrogenases