title: Cdk1 interplays with Oct4 to repress differentiation of embryonic stem cells into trophectoderm.
abstract: Cdk1 plays an important role in undifferentiated ES cells, but the underlying mechanism remains unclear. This study explores how Cdk1 collaborates with Oct4 to inhibit differentiation in mouse ES cells. We show a direct interaction between Cdk1 and Oct4, whereas other Cdk members, including Cdk2 and Cdk4, fail to associate with Oct4. By immunocytochemistry we show that Cdk1 and Oct4 co-localize in ES cells. The biological function of the Cdk1-Oct4 complex was also addressed. We found that Cdk1 enhances the binding of Oct4 on the trophectoderm marker Cdx2 and promotes Cdx2 repression. This regulation is independent of Cyclins and of the kinase activity of Cdk1. Our study explains how Cdk1 and Oct4 interplay to inhibit ES cell differentiation into trophectoderm and thereby maintain stemness.
authors.affiliation: College of Life Sciences, Capital Normal University, Beijing, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Hou
authors.forename: Zhaojia
authors.initials: Z
authors.lastname: Wu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhuang
authors.forename: Mengxue
authors.initials: M
authors.lastname: Lu
authors.forename: Yiran
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xiaohan
authors.initials: X
authors.lastname: Zhou
authors.forename: Zhaoyan
authors.initials: Z
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Xiao
authors.forename: Weiwei
authors.initials: W
authors.lastname: Zhang
mesh_terms: D000818:Animals; D015153:Blotting, Western; D016203:CDC2 Protein Kinase / Q000235:genetics / Q000378:metabolism*; D002454:Cell Differentiation / Q000235:genetics / Q000502:physiology*; D002460:Cell Line; D047369:Chromatin Immunoprecipitation; D024202:Electrophoretic Mobility Shift Assay; D053595:Embryonic Stem Cells / Q000166:cytology* / Q000378:metabolism*; D007150:Immunohistochemistry; D047468:Immunoprecipitation; D051379:Mice; D050814:Octamer Transcription Factor-3 / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding / Q000235:genetics / Q000502:physiology; D014327:Trophoblasts / Q000166:cytology* / Q000378:metabolism*
chemical_list: D050814:Octamer Transcription Factor-3; C494174:Pou5f1 protein, mouse; D016203:CDC2 Protein Kinase