Abstract
βTrCP and HOS are closely related F-box proteins, which play key roles in ubiquitination and degradation of β-catenin and IκB through associating with those phosphorylated substrates and recruiting SCF E3 ubiquitin ligase. Here we report that activation of Wnt/β-catenin signal transduction pathway elevates βTrCP levels but inhibits expression of HOS in 293T cells. Similar disparity is likely to exist in human colorectal tumors. In the NIH3T3 cells, which express HOS, but not βTrCP, Wnt/β-catenin signaling leads to inhibition of HOS promoter activity and NF-κB-driven transcription as well as to stabilization of β-catenin. These results indicate that expression and activities of HOS are negatively regulated by Wnt/β-catenin pathway.
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Acknowledgements
We appreciate the comments of unknown reviewers, which helped us to improve this manuscript. We thank P Stavropoulos for constructing the HOS promoter-driven luciferase reporter. We are grateful to Dr F Luca for critical suggestions. We also thank Drs S Aaronson, B Vogelstein, J Manfredi and P Polakis for reagents. The work was supported in part by NIH grants CA 92900 (to SY Fuchs) and CA 76262 (to TJ Slaga).
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Spiegelman, V., Tang, W., Katoh, M. et al. Inhibition of HOS expression and activities by Wnt pathway. Oncogene 21, 856–860 (2002). https://doi.org/10.1038/sj.onc.1205132
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DOI: https://doi.org/10.1038/sj.onc.1205132
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