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Inactivation of HAUSP in vivo modulates p53 function

Oncogene volume 29, pages 1270–1279 (2010)Cite this article

Abstract

Hausp is a deubiquitinase that has been shown to regulate the p53–Mdm2 pathway. Cotransfection of p53 and Hausp stabilizes p53 through the removal of ubiquitin moieties from polyubiquitinated p53. Interestingly, knockout or RNA interference-mediated knockdown of Hausp in human cells also resulted in the stabilization of p53 due to the destabilization of Mdm2, suggesting a dynamic role of Hausp in p53 activation. To understand the physiological functions of Hausp, we generated hausp knockout mice. Hausp knockout mice die during early embryonic development between embryonic days E6.5 and E7.5. The hausp knockout embryos showed p53 activation, but no apparent increase in apoptosis. Embryonic lethality was caused by a dramatic reduction in proliferation and termination in development, in part due to p53 activation and/or abrogation of p53-independent functions. Although deletion of p53 did not completely rescue the embryonic lethality of the hausp knockout, embryonic development was extended in both hausp and p53 double knockout embryos. These data show that Hausp has a critical role in regulating the p53–Mdm2 pathway.

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Acknowledgements

We thank Qiong Li and Xi Sun for their expert assistance with histology. We also thank Dr Chi-Ming Li for helpful suggestions. This study was supported in part by a postdoctoral fellowship from NIH to NK and grants from NIH/NCI to TL and WG.

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Authors and Affiliations

  1. Institute for Cancer Genetics, Columbia University, New York, NY, USA

    N Kon, Y Kobayashi, M Li, C L Brooks, T Ludwig & W Gu

  2. Department of Pathology, Columbia University, New York, NY, USA

    W Gu

  3. Department of Anatomy and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY, USA

    T Ludwig

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  1. N Kon
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  2. Y Kobayashi
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  3. M Li
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  4. C L Brooks
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  5. T Ludwig
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  6. W Gu
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Correspondence to W Gu.

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Kon, N., Kobayashi, Y., Li, M. et al. Inactivation of HAUSP in vivo modulates p53 function. Oncogene 29, 1270–1279 (2010). https://doi.org/10.1038/onc.2009.427

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