title: Sox21 is a repressor of neuronal differentiation and is antagonized by YB-1.
abstract: Sox21, a high-mobility group box transcription factor, is expressed throughout the immature neural stem/progenitor population in ventricular zone but not in the cortical plate in embryonic mouse brain and its expression is restricted to the subventricular zone in the adult brain. In undifferentiated PC12 cells, endogenous Sox21 expression is detected but its expression ceases during the nerve growth factor (NGF)-induced neuronal differentiation. Overexpression of Sox21 results in a substantial repression of NGF-induced neurite outgrowth in PC12 cells. Further, we biochemically identified a Sox21-associating protein, Y-box binding protein 1 which not only binds to Sox21 but also partially restores NGF-induced neurite outgrowth of PC12 cells inhibited by Sox21. These results suggest that Sox21 is a repressor of neuronal differentiation in the developing nervous system.
authors.affiliation: CREST-JST and Department of Physiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ohba
authors.forename: Tatsuyuki
authors.initials: T
authors.lastname: Chiyoda
authors.forename: Emmy
authors.initials: E
authors.lastname: Endo
authors.forename: Masato
authors.initials: M
authors.lastname: Yano
authors.forename: Yoshika
authors.initials: Y
authors.lastname: Hayakawa
authors.forename: Masanori
authors.initials: M
authors.lastname: Sakaguchi
authors.forename: Robert B
authors.initials: RB
authors.lastname: Darnell
authors.forename: Hirotaka J
authors.initials: HJ
authors.lastname: Okano
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Okano
mesh_terms: D000818:Animals; D022762:CCAAT-Enhancer-Binding Proteins / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D002454:Cell Differentiation / Q000235:genetics*; D002540:Cerebral Cortex / Q000166:cytology / Q000196:embryology* / Q000378:metabolism*; D005333:Fetus; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects / Q000235:genetics; D006609:High Mobility Group Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D051839:NFI Transcription Factors; D009363:Neoplasm Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D020932:Nerve Growth Factor / Q000378:metabolism / Q000494:pharmacology; D016501:Neurites / Q000187:drug effects / Q000378:metabolism; D009474:Neurons / Q000166:cytology / Q000378:metabolism*; D016716:PC12 Cells; D011485:Protein Binding / Q000187:drug effects / Q000502:physiology; D051381:Rats; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D055757:SOXE Transcription Factors; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D051840:Y-Box-Binding Protein 1
chemical_list: D022762:CCAAT-Enhancer-Binding Proteins; D006609:High Mobility Group Proteins; D051839:NFI Transcription Factors; D009363:Neoplasm Proteins; D012097:Repressor Proteins; D055757:SOXE Transcription Factors; C527924:Sox10 protein, mouse; C527925:Sox10 protein, rat; D014157:Transcription Factors; D051840:Y-Box-Binding Protein 1; D020932:Nerve Growth Factor