title: Upregulation of placental indoleamine 2,3-dioxygenase by human chorionic gonadotropin.
abstract: We tested the hypothesis that hCG can upregulate human trophoblast indoleamine 2, 3-dioxygenase (INDO), which catalyzes the breakdown of tryptophan in villous circulation. The results revealed that it can. Treatment of human trophoblasts with hCG resulted in a time and dose dependent increase in INDO mRNA and protein levels and its enzyme activity. The hCG effect was hormone specific and required the dimer conformation of hCG. The hCG effect required its receptors and was mediated by a cAMP dependent, but protein kinase A independent, mitogen-activated protein kinase 3/1 (MAPK3/1) signaling mechanism. In summary, the present data demonstrate a novel hCG effect on human placental INDO, which probably plays a key role at maternal fetal interface in preventing fetal rejection.
authors.affiliation: Division of Research, Department of Obstetrics, Gynecology and Women's Health, University of Louisville, Health Sciences Center, Louisville, Kentucky 40292, USA.
authors.forename: Z M
authors.initials: ZM
authors.lastname: Lei
authors.forename: M
authors.initials: M
authors.lastname: Yang
authors.forename: X
authors.initials: X
authors.lastname: Li
authors.forename: O
authors.initials: O
authors.lastname: Takikawa
authors.forename: C V
authors.initials: CV
authors.lastname: Rao
mesh_terms: D002478:Cells, Cultured; D006063:Chorionic Gonadotropin / Q000494:pharmacology*; D004357:Drug Synergism; D005260:Female; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects*; D006801:Humans; D050503:Indoleamine-Pyrrole 2,3,-Dioxygenase / Q000235:genetics* / Q000378:metabolism; D007371:Interferon-gamma / Q000494:pharmacology; D010920:Placenta / Q000187:drug effects* / Q000201:enzymology* / Q000378:metabolism; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D012333:RNA, Messenger / Q000378:metabolism; D014327:Trophoblasts / Q000187:drug effects / Q000201:enzymology
chemical_list: D006063:Chorionic Gonadotropin; D050503:Indoleamine-Pyrrole 2,3,-Dioxygenase; D012333:RNA, Messenger; D007371:Interferon-gamma