Canonical Wnt signaling is thought to regulate cell behavior mainly by inducing β-catenin-dependent transcription of target genes. In proliferating cells Wnt signaling peaks in the G2/M phase of the cell cycle, but the significance of this "mitotic Wnt signaling" is unclear. Here we introduce Wnt-dependent stabilization of proteins (Wnt/STOP), which is independent of β-catenin and peaks during mitosis. We show that Wnt/STOP plays a critical role in protecting proteins, including c-MYC, from GSK3-dependent polyubiquitination and degradation. Wnt/STOP signaling increases cellular protein levels and cell size. Wnt/STOP, rather than β-catenin signaling, is the dominant mode of Wnt signaling in several cancer cell lines, where it is required for cell growth. We propose that Wnt/STOP signaling slows down protein degradation as cells prepare to divide. © 2014 Elsevier Inc.
CITATION STYLE
Acebron, S. P., Karaulanov, E., Berger, B. S., Huang, Y. L., & Niehrs, C. (2014). Mitotic Wnt Signaling Promotes Protein Stabilization and Regulates Cell Size. Molecular Cell, 54(4), 663–674. https://doi.org/10.1016/j.molcel.2014.04.014
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