Rak Functions as a Tumor Suppressor by Regulating PTEN Protein Stability and Function

Eun Kyoung Yim, Guang Peng, Hui Dai, Ruozhen Hu, Kaiyi Li, Yiling Lu, Gordon Mills, Funda Meric-Bernstam, Bryan T. Hennessy, Rolf J. Craven, Shiaw Yih Lin

Research output: Contribution to journalArticle

117 Citations (Scopus)

Abstract

Expression of the PTEN tumor suppressor is frequently lost in breast cancer in the absence of mutation or promoter methylation through as yet undetermined mechanisms. In this study, we demonstrate that the Rak tyrosine kinase physically interacts with PTEN and phosphorylates PTEN on Tyr336. Knockdown of Rak enhanced the binding of PTEN to its E3 ligase NEDD4-1 and promoted PTEN polyubiquitination, leading to PTEN protein degradation. Notably, ectopic expression of Rak effectively suppressed breast cancer cell proliferation, invasion, and colony formation in vitro and tumor growth in vivo. Furthermore, Rak knockdown was sufficient to transform normal mammary epithelial cells. Therefore, Rak acts as a bona fide tumor suppressor gene through the mechanism of regulating PTEN protein stability and function.

Original languageEnglish (US)
Pages (from-to)304-314
Number of pages11
JournalCancer Cell
Volume15
Issue number4
DOIs
StatePublished - Apr 7 2009
Externally publishedYes

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PTEN Phosphohydrolase
Protein Stability
Breast Neoplasms
Ubiquitin-Protein Ligases
Tumor Suppressor Genes
Protein-Tyrosine Kinases
Methylation
Proteolysis
Neoplasms
Breast
Epithelial Cells
Cell Proliferation
Mutation
Growth
Ectopic Gene Expression

Keywords

  • CELLCYCLE

ASJC Scopus subject areas

  • Oncology
  • Cell Biology
  • Cancer Research

Cite this

Yim, E. K., Peng, G., Dai, H., Hu, R., Li, K., Lu, Y., ... Lin, S. Y. (2009). Rak Functions as a Tumor Suppressor by Regulating PTEN Protein Stability and Function. Cancer Cell, 15(4), 304-314. https://doi.org/10.1016/j.ccr.2009.02.012

Rak Functions as a Tumor Suppressor by Regulating PTEN Protein Stability and Function. / Yim, Eun Kyoung; Peng, Guang; Dai, Hui; Hu, Ruozhen; Li, Kaiyi; Lu, Yiling; Mills, Gordon; Meric-Bernstam, Funda; Hennessy, Bryan T.; Craven, Rolf J.; Lin, Shiaw Yih.

In: Cancer Cell, Vol. 15, No. 4, 07.04.2009, p. 304-314.

Research output: Contribution to journalArticle

Yim, EK, Peng, G, Dai, H, Hu, R, Li, K, Lu, Y, Mills, G, Meric-Bernstam, F, Hennessy, BT, Craven, RJ & Lin, SY 2009, 'Rak Functions as a Tumor Suppressor by Regulating PTEN Protein Stability and Function', Cancer Cell, vol. 15, no. 4, pp. 304-314. https://doi.org/10.1016/j.ccr.2009.02.012
Yim, Eun Kyoung ; Peng, Guang ; Dai, Hui ; Hu, Ruozhen ; Li, Kaiyi ; Lu, Yiling ; Mills, Gordon ; Meric-Bernstam, Funda ; Hennessy, Bryan T. ; Craven, Rolf J. ; Lin, Shiaw Yih. / Rak Functions as a Tumor Suppressor by Regulating PTEN Protein Stability and Function. In: Cancer Cell. 2009 ; Vol. 15, No. 4. pp. 304-314.
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