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Id-1 activates Akt-mediated Wnt signaling and p27(Kip1) phosphorylation through PTEN inhibition

J-Y Lee1, M-B Kang, S-H Jang

  • 1Department of Pathology, College of Medicine, Hanyang University, Seongdong-Gu, Seoul, Republic of Korea.

Oncogene
|December 17, 2008
PubMed

Insights

Inhibitor of differentiation-1 (Id-1) activates the Akt pathway by suppressing phosphatase and tensin homologue deleted on chromosome 10 (PTEN) transcription via p53 downregulation. This Id-1 action promotes breast cancer progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Inhibitor of differentiation-1 (Id-1) is recognized as an oncogene.
  • Id-1 promotes oncogenesis by inactivating tumor suppressors and activating growth pathways.

Purpose of the Study:

  • To elucidate the mechanism by which Id-1 activates the Akt pathway.
  • To investigate the role of Id-1 in regulating PTEN and p53.
  • To explore the downstream signaling events influenced by Id-1 in breast cancer.

Main Methods:

  • Reporter assays to assess promoter activity.
  • Chromatin immunoprecipitation assays to determine protein-DNA interactions.
  • Western blotting to analyze protein phosphorylation and expression levels.

Main Results:

  • Id-1 downregulates both p53 and PTEN at the transcriptional level.
  • Id-1 reduces p53 binding to the PTEN promoter, inhibiting PTEN transcription.
  • Id-1 activates Akt phosphorylation, leading to downstream activation of Wnt/TCF signaling and increased p27(Kip1) phosphorylation.

Conclusions:

  • Id-1 acts as a novel inhibitor of PTEN, activating the Akt pathway.
  • Id-1's oncogenic function in breast cancer is partly mediated by PTEN inhibition.
  • Id-1 influences key signaling pathways involved in cell proliferation and survival.

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