title: Spontaneous, gonadotropin-releasing hormone-induced, and progesterone-inhibited pulsatile secretion of human chorionic gonadotropin in the first trimester placenta in vitro.
abstract: Using a multichannel superfusion apparatus, the secretion of human chorionic gonadotropin (hCG) was measured at 1-6 minute intervals in placental explants at 7-9 weeks of gestation. hCG was found to be secreted in distinct pulses (4-5 fold above baseline) every 11-23 minutes peak to peak. Addition of one minute pulses of GnRH analog significantly increased, whereas pulses of progesterone decreased, pulsatile hCG secretion.
authors.affiliation: Rappaport Family Institute for Research in the Medical Sciences, Technion-Israel Institute of Technology, Haifa.
authors.forename: E R
authors.initials: ER
authors.lastname: Barnea
authors.forename: M
authors.initials: M
authors.lastname: Kaplan
mesh_terms: D006063:Chorionic Gonadotropin / Q000378:metabolism*; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000031:analogs & derivatives / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D008954:Models, Biological; D010920:Placenta / Q000187:drug effects / Q000378:metabolism*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011374:Progesterone / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D006063:Chorionic Gonadotropin; D007987:Gonadotropin-Releasing Hormone; D011374:Progesterone