title: Regulation by human chorionic gonadotropin of sodium/iodide symporter gene expression in the JAr human choriocarcinoma cell line.
abstract: Sodium/iodide symporter (NIS) gene and protein expressions have been recently described in human cytotrophoblasts, emphasizing its potential function in the active transport of iodide from the mother to the fetus. In this study we analyzed NIS expression and function in the human JAr placental choriocarcinoma cell line. Using real-time quantitative RT-PCR, we first demonstrated that NIS transcripts are expressed at a high level in JAr cells compared with other cell lines, including thyroid cancer cells. Functional analysis clearly showed that Jar cells are able to concentrate iodide in presence of hCG. Iodide accumulation increased after 2-h exposure to 5 IU/ml hCG, to 6-fold over the basal level after 8 h. This effect was reproduced using forskolin, the cAMP analog (Bu)(2)-cAMP, and phorbol acetate. Moreover, hCG increased both NIS mRNA after 2 h and NIS protein levels after 4 h, reaching a maximum after 8 h in both cases. In conclusion, our data demonstrate that 1) NIS is expressed in JAr cells; 2) iodide transport in JAr cells is regulated by hCG and by cAMP-dependent and -independent mechanisms; 3) the stimulation of iodide uptake is due to an increase in both NIS mRNA and protein levels; and 4) JAr cells may represent an excellent in vitro model suitable to analyze the molecular mechanisms involved in iodide transport from mother to fetus.
authors.affiliation: Dipartimento di Medicina Sperimentale e Clinica, Università di Catanzaro, Magna Graecia 88100 Catanzaro, Italy.
authors.forename: Franco
authors.initials: F
authors.lastname: Arturi
authors.forename: Ludovic
authors.initials: L
authors.lastname: Lacroix
authors.forename: Ivan
authors.initials: I
authors.lastname: Presta
authors.forename: Daniela
authors.initials: D
authors.lastname: Scarpelli
authors.forename: Bernard
authors.initials: B
authors.lastname: Caillou
authors.forename: Martin
authors.initials: M
authors.lastname: Schlumberger
authors.forename: Diego
authors.initials: D
authors.lastname: Russo
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Bidart
authors.forename: Sebastiano
authors.initials: S
authors.lastname: Filetti
mesh_terms: D015153:Blotting, Western; D002822:Choriocarcinoma / Q000235:genetics* / Q000378:metabolism; D006063:Chorionic Gonadotropin / Q000494:pharmacology*; D000242:Cyclic AMP / Q000502:physiology; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D006801:Humans; D007454:Iodides; D007457:Iodine Radioisotopes; D009363:Neoplasm Proteins / Q000096:biosynthesis; D012333:RNA, Messenger / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D027981:Symporters / Q000096:biosynthesis / Q000235:genetics*; D014407:Tumor Cells, Cultured; D014594:Uterine Neoplasms / Q000235:genetics* / Q000378:metabolism; D000099209:Sodium-Iodide Symporters
chemical_list: D006063:Chorionic Gonadotropin; D000242:Cyclic AMP; D007454:Iodides; D007457:Iodine Radioisotopes; D009363:Neoplasm Proteins; D012333:RNA, Messenger; D027981:Symporters; D000099209:Sodium-Iodide Symporters