Journal
MOLECULAR CELL
Volume 37, Issue 2, Pages 183-195Publisher
CELL PRESS
DOI: 10.1016/j.molcel.2009.12.022
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Funding
- Research Center for Chromatin Dynamics [2009-0081563]
- SRC program [R11-2005-017-04004-0]
- Ubiquitome Research Program [2008-00983]
- National Research Foundation (NRF), Ministry of Education, Science, and Technology (MEST) of Korea
- Brain Korea 21 fellowship
- National Research Foundation of Korea [2008-0057888, 2009-0081563, 2005-2001163, 과06A1206] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Wnt family members play diverse roles in development and disease. Noncanonical Wnt ligands can inhibit canonical Wnt signaling depending on the cellular context; however, the underlying mechanism of this antagonism remains poorly understood. Here we identify a specific mechanism of orphan nuclear receptor ROR alpha-mediated inhibition of canonical Wnt signaling in colon cancer. Wnt5a/PKC alpha-dependent phosphorylation on serine residue 35 of ROR alpha is crucial to link ROR alpha to Wnt/beta-catenin signaling, which exerts inhibitory function of the expression of Wnt/beta-catenin target genes. Intriguingly, there is a significant correlation of reduction of ROR alpha phosphorylation in colorectal tumor cases compared to their normal counterpart, providing the clinical relevance of the findings. Our data provide evidence for a role of ROR alpha, functioning at the crossroads between the canonical and the noncanonical Wnt signaling pathways, in mediating transrepression of the Wnt/beta-catenin target genes, thereby providing new approaches for the development of therapeutic agents for human cancers.
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