Sox9 Inhibits Wnt Signaling by Promoting β-Catenin Phosphorylation in the Nucleus

Chondrocyte fate determination and maintenance requires Sox9, an intrinsic transcription factor, but is inhibited by Wnt/β-catenin signaling activated by extrinsic Wnt ligands. Here we explored the underlying molecular mechanism by which Sox9 antagonizes the Wnt/β-catenin signaling in chondrocyte di...

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Published in:The Journal of biological chemistry 2009-01, Vol.284 (5), p.3323-3333
Main Authors: Topol, Lilia, Chen, Wen, Song, Hai, Day, Timothy F., Yang, Yingzi
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title Sox9 Inhibits Wnt Signaling by Promoting β-Catenin Phosphorylation in the Nucleus
format Article
creator Topol, Lilia
Chen, Wen
Song, Hai
Day, Timothy F.
Yang, Yingzi
subjects Animals
Base Sequence
beta Catenin - metabolism
Blotting, Western
Cell Line
Cell Nucleus - metabolism
DNA Primers
Fluorescent Antibody Technique, Indirect
Glycogen Synthase Kinase 3 - chemistry
Glycogen Synthase Kinase 3 - metabolism
Humans
Immunoprecipitation
Mice
Phosphorylation
Protein Transport
Signal Transduction - physiology
SOX9 Transcription Factor - physiology
Transducin - chemistry
Transducin - metabolism
Wnt Proteins - metabolism
ispartof The Journal of biological chemistry, 2009-01, Vol.284 (5), p.3323-3333
description Chondrocyte fate determination and maintenance requires Sox9, an intrinsic transcription factor, but is inhibited by Wnt/β-catenin signaling activated by extrinsic Wnt ligands. Here we explored the underlying molecular mechanism by which Sox9 antagonizes the Wnt/β-catenin signaling in chondrocyte differentiation. We found that Sox9 employed two distinct mechanisms to inhibit Wnt/β-catenin signaling: the Sox9 N terminus is necessary and sufficient to promote β-catenin degradation, whereas the C terminus is required to inhibit β-catenin transcriptional activity without affecting its stability. Sox9 binds to β-catenin and components of the β-catenin “destruction complex,” glycogen synthase kinase 3 and β-transducin repeat containing protein, to promote their nuclear localization. Independent of its DNA binding ability, nuclear localization of Sox9 is both necessary and sufficient to enhance β-catenin phosphorylation and its subsequent degradation. Thus, one mechanism whereby Sox9 regulates chondrogenesis is to promote efficient β-catenin phosphorylation in the nucleus. This mechanism may be broadly employed by other intrinsic cell fate determining transcription factors to promptly turn off extrinsic inhibitory Wnt signaling mediated by β-catenin.
language eng
source BACON - Elsevier - GLOBAL_SCIENCEDIRECT-OPENACCESS; Open Access: PubMed Central; AUTh Library subscriptions: Elsevier ScienceDirect Journals
identifier ISSN: 0021-9258
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1083-351X
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Here we explored the underlying molecular mechanism by which Sox9 antagonizes the Wnt/β-catenin signaling in chondrocyte differentiation. We found that Sox9 employed two distinct mechanisms to inhibit Wnt/β-catenin signaling: the Sox9 N terminus is necessary and sufficient to promote β-catenin degradation, whereas the C terminus is required to inhibit β-catenin transcriptional activity without affecting its stability. Sox9 binds to β-catenin and components of the β-catenin “destruction complex,” glycogen synthase kinase 3 and β-transducin repeat containing protein, to promote their nuclear localization. Independent of its DNA binding ability, nuclear localization of Sox9 is both necessary and sufficient to enhance β-catenin phosphorylation and its subsequent degradation. Thus, one mechanism whereby Sox9 regulates chondrogenesis is to promote efficient β-catenin phosphorylation in the nucleus. This mechanism may be broadly employed by other intrinsic cell fate determining transcription factors to promptly turn off extrinsic inhibitory Wnt signaling mediated by β-catenin.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>19047045</pmid><doi>10.1074/jbc.M808048200</doi><oa>free_for_read</oa></addata></record>