title: Effect of 14-3-3 tau protein on differentiation in BeWo choriocarcinoma cells.
abstract: This study aimed to investigate the location and function of tau isoform of 14-3-3 proteins in human trophoblast. 14-3-3 tau was localized in human cytotrophoblast cells, but not in syncytiotrophoblast cells in both first trimester and term placenta by immunochemistry stain. Forskolin-induced cell fusion (BeWo cells) confirmed that 14-3-3 tau was decreased during trophoblast differentiation. Forskolin-induced differentiation was stimulated by small-interfering (si) RNA induced down-regulation of 14-3-3 tau, contrarily, it was suppressed by plasmid induced upregulation of 14-3-3 tau in BeWo cells. When BeWo cells were treated with 14-3-3 tau siRNA, an increase in protein concentration of cell cycle inhibitor p27kip1 and a decrease in protein concentration of proliferating cell nuclear antigen, as well as activation of the extracellular signal-regulated kinase (ERK) pathway, were also noticed. These findings suggest that 14-3-3 tau might be mediated trophoblast differentiation through cell cycle regulation.
authors.affiliation: Obstetrics & Gynecology Hospital, Fudan University, 419 Fangxie Road, Shanghai 200011, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Cheng
authors.forename: R
authors.initials: R
authors.lastname: Hu
authors.forename: H
authors.initials: H
authors.lastname: Jin
authors.forename: K
authors.initials: K
authors.lastname: Ma
authors.forename: S
authors.initials: S
authors.lastname: Zhou
authors.forename: H
authors.initials: H
authors.lastname: Cheng
authors.forename: D
authors.initials: D
authors.lastname: Ma
authors.forename: X
authors.initials: X
authors.lastname: Li
mesh_terms: D048948:14-3-3 Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D002453:Cell Cycle / Q000187:drug effects / Q000235:genetics; D002454:Cell Differentiation / Q000187:drug effects / Q000235:genetics*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002822:Choriocarcinoma / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D005576:Colforsin / Q000494:pharmacology; D005260:Female; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D010920:Placenta / Q000378:metabolism; D011247:Pregnancy; D011261:Pregnancy Trimester, First / Q000378:metabolism; D034741:RNA, Small Interfering / Q000494:pharmacology; D014594:Uterine Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology*
chemical_list: D048948:14-3-3 Proteins; D034741:RNA, Small Interfering; D005576:Colforsin