Preparing your results

Our searching services are busy right now. Your search will reload in five seconds.

Forgot Password

If you have forgotten your password you can enter your email here and get a temporary password sent to your email.

A functional link between Wnt signaling and SKP2-independent p27 turnover in mammary tumors.

Genes & development | Nov 15, 2008

Loss of the CDK inhibitor p27(KIP1) is widely linked with poor prognosis in human cancer. In Wnt10b-expressing mammary tumors, levels of p27(KIP1) were extremely low; conversely, Wnt10b-null mammary cells expressed high levels of this protein, suggesting Wnt-dependent regulation of p27(KIP1). Interestingly we found that Wnt-induced turnover of p27(KIP1) was independent from classical SCF(SKP2)-mediated degradation in both mouse and human cells. Instead, turnover required Cullin 4A and Cullin 4B, components of an alternative E3 ubiquitin ligase induced in response to active Wnt signaling. We found that CUL4A was a novel Wnt target gene in both mouse and human cells and that CUL4A physically interacted with p27(KIP1) in Wnt-responding cells. We further demonstrated that both Cul4A and Cul4B were required for Wnt-induced p27(KIP1) degradation and S-phase progression. CUL4A and CUL4B are therefore components of a conserved Wnt-induced proteasome targeting (WIPT) complex that regulates p27(KIP1) levels and cell cycle progression in mammalian cells.

Pubmed ID: 19056892 RIS Download

Mesh terms: Animals | Breast Neoplasms | Cell Cycle | Cell Line | Cell Line, Tumor | Chromatin Immunoprecipitation | Cullin Proteins | Cyclin-Dependent Kinase Inhibitor p27 | Female | Humans | Immunoblotting | Immunoprecipitation | Karyopherins | Male | Mice | Mice, Transgenic | Mutation | Proteasome Endopeptidase Complex | Receptors, Cytoplasmic and Nuclear | S-Phase Kinase-Associated Proteins | Signal Transduction | Wnt Proteins

Research resources used in this publication

None found

Research tools detected in this publication

None found

Data used in this publication

None found

Associated grants

  • Agency: NCI NIH HHS, Id: CA09056
  • Agency: NIGMS NIH HHS, Id: GM07185
  • Agency: NICHD NIH HHS, Id: HD001400-08
  • Agency: NCI NIH HHS, Id: R01-CA107002
  • Agency: NICHD NIH HHS, Id: R03 HD53888

GO (Data, Gene Annotation)

Publication data is provided by the National Library of Medicine ® and PubMed ®. Data is retrieved from PubMed ® on a weekly schedule. For terms and conditions see the National Library of Medicine Terms and Conditions.