Journal
MOLECULAR CANCER RESEARCH
Volume 13, Issue 5, Pages 902-912Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1541-7786.MCR-14-0180
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Funding
- l'Association de la Recherche sur le Cancer (ARC)
- CEDRE (Program of scientific cooperation Franco-Lebanese)
- Ligue contre le Cancer, Association pour la Recherche contre le Cancer
- ANR
- Association d'Aide a la Recherche Cancerologique de Saint-Cloud (ARCS)
- GenHomme Network grant [02490-6088]
- Institut Curie
- CNRS (ATIP program)
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The WW domain containing oxidoreductase (WWOX) has recently been shown to inhibit of the Wnt/beta-catenin pathway by preventing the nuclear import of disheveled 2 (DVL2) in human breast cancer cells. Here, it is revealed that WWOX also interacts with the BCL9-2, a cofactor of the Wnt/beta-catenin pathway, to enhance the activity of the beta-catenin-TCF/LEF (T-cell factor/ lymphoid enhancer factors family) transcription factor complexes. By using both a luciferase assay in MCF-7 cells and a Xenopus secondary axis induction assay, it was demonstrated that WWOX inhibits the BCL9-2 function in Wnt/beta-catenin signaling. WWOX does not affect the BCL9-2-beta-catenin association and colocalizes with BCL9-2 and beta-catenin in the nucleus of the MCF-7 cells. Moreover, WWOX inhibits the beta-catenin-TCF1 interaction. Further examination found that HDAC3 associates with BCL9-2, enhances the inhibitory effect of WWOX on BCL9-2 transcriptional activity, and promotes the WWOX-BCL9-2 interaction, independent of its deacetylase activity. However, WWOX does not influence the HDAC3-BCL9-2 interaction. Altogether, these results strongly indicate that nuclear WWOX interacts with BCL9-2 associated with beta-catenin only when BCL9-2 is in complex with HDAC3 and inhibits its transcriptional activity, in part, by inhibiting the beta-catenin-TCF1 interaction. The promotion of the WWOX-BCL9-2 interaction by HDAC3, independent of its deacetylase activity, represents a new mechanism by which this HDAC inhibits transcription. (C)2015 AACR.
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