title: Identification of Zfp-57 as a downstream molecule of STAT3 and Oct-3/4 in embryonic stem cells.
abstract: Embryonic stem (ES) cells are pluripotent cells derived from the inner cell mass of blastocysts. Transcription factor STAT3 is essential for the self-renewal of ES cells. In this study, we searched for downstream molecules of STAT3 in ES cells. Using DNA chip analysis, we obtained zinc finger protein (Zfp)-57. The expression of Zfp-57 was restricted to undifferentiated ES cells and activation of STAT3 led to expression of Zfp-57. We also found that forced expression of a dominant-negative mutant of STAT3 or repression of Oct-3/4 expression led to down-regulation of Zfp-57. Targeted disruption of Zfp-57 resulted in no gross phenotypical defects, including expression of undifferentiated-state-specific genes. These data suggest that Zfp-57 is a downstream molecule of STAT3 and Oct-3/4 in ES cells, although dispensable for their self-renewal.
authors.affiliation: Department of Stem Cell Biology, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa 920-8640, Japan.
authors.forename: Tadayuki
authors.initials: T
authors.lastname: Akagi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Usuda
authors.forename: Takahiko
authors.initials: T
authors.lastname: Matsuda
authors.forename: Minoru S H
authors.initials: MS
authors.lastname: Ko
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Niwa
authors.forename: Masahide
authors.initials: M
authors.lastname: Asano
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Koide
authors.forename: Takashi
authors.initials: T
authors.lastname: Yokota
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004622:Embryo, Mammalian / Q000166:cytology*; D005786:Gene Expression Regulation; D018390:Gene Targeting; D051379:Mice; D050814:Octamer Transcription Factor-3; D034622:RNA Interference; D012333:RNA, Messenger / Q000378:metabolism; D012097:Repressor Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology*; D050796:STAT3 Transcription Factor; D015398:Signal Transduction; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism*; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; D050814:Octamer Transcription Factor-3; C494174:Pou5f1 protein, mouse; D012333:RNA, Messenger; D012097:Repressor Proteins; D050796:STAT3 Transcription Factor; C494087:Stat3 protein, mouse; D015534:Trans-Activators; D014157:Transcription Factors; C501529:Zfp-57 protein, mouse