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Smad Ubiquitination Regulatory Factor 2 Promotes Metastasis of Breast Cancer Cells by Enhancing Migration and Invasiveness

Chaoyang Jin, Yu-an Yang, Miriam R. Anver, Nicole Morris, Xiangchun Wang and Ying E. Zhang
Chaoyang Jin
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Yu-an Yang
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Miriam R. Anver
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Nicole Morris
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Xiangchun Wang
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Ying E. Zhang
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DOI: 10.1158/0008-5472.CAN-08-1463 Published February 2009
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Abstract

Controlled protein degradation mediated by ubiquitin/proteasome system (UPS) plays a crucial role in modulating a broad range of cellular responses. Dysregulation of the UPS often accompanies tumorigenesis and progression. Here, we report that Smad ubiquitination regulatory factor 2 (Smurf2), a HECT-domain containing E3 ubiquitin ligase, is up-regulated in certain breast cancer tissues and cells. We show that reduction of Smurf2 expression with specific short interfering RNA in metastatic breast cancer cells induces cell rounding and reorganization of the actin cytoskeleton, which are associated with a less motile and invasive phenotype. Overexpression of Smurf2 promotes metastasis in a nude mouse model and increases migration and invasion of breast cancer cells. Moreover, expression of Smurf2CG, an E3 ligase–defective mutant of Smurf2, suppresses the above metastatic behaviors. These results establish an important role for Smurf2 in breast cancer progression and indicate that Smurf2 is a novel regulator of breast cancer cell migration and invasion. [Cancer Res 2009;69(3):735–40]

  • Smurf2
  • breast cancer
  • motility
  • metastasis
  • TGF-β

Footnotes

  • Note: Supplementary data for this article are available at Cancer Research Online (http://cancerres.aacrjournals.org/).

  • Received April 22, 2008.
  • Revision received August 28, 2008.
  • Accepted November 21, 2008.
  • ©2009 American Association for Cancer Research.
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Cancer Research: 69 (3)
February 2009
Volume 69, Issue 3
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Smad Ubiquitination Regulatory Factor 2 Promotes Metastasis of Breast Cancer Cells by Enhancing Migration and Invasiveness
Chaoyang Jin, Yu-an Yang, Miriam R. Anver, Nicole Morris, Xiangchun Wang and Ying E. Zhang
Cancer Res February 1 2009 (69) (3) 735-740; DOI: 10.1158/0008-5472.CAN-08-1463

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Smad Ubiquitination Regulatory Factor 2 Promotes Metastasis of Breast Cancer Cells by Enhancing Migration and Invasiveness
Chaoyang Jin, Yu-an Yang, Miriam R. Anver, Nicole Morris, Xiangchun Wang and Ying E. Zhang
Cancer Res February 1 2009 (69) (3) 735-740; DOI: 10.1158/0008-5472.CAN-08-1463
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