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Tumor suppressor VDUP1 increases p27(kip1) stability by inhibiting JAB1

Jun-Ho Jeon1, Kee-Nyung Lee, Chae Young Hwang

  • 1Laboratory of Immunology, Korea Research Institute of Bioscience and Biotechnology, Yusong, Taejon, Republic of Korea.

Cancer Research
|June 3, 2005
PubMed

Insights

Vitamin D3 up-regulated protein 1 (VDUP1) regulates cell proliferation by stabilizing p27(kip1) protein levels. This study reveals VDUP1

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Vitamin D3 up-regulated protein 1 (VDUP1) is a stress-response gene.
  • Reduced VDUP1 expression is observed in tumor cells, correlating with inhibited cell proliferation.
  • JAB1 interacts with p27(kip1), a cyclin-dependent kinase inhibitor, reducing its stability.

Purpose of the Study:

  • To investigate the role of VDUP1 in cell proliferation and its interaction with p27(kip1) and JAB1.
  • To elucidate the mechanism by which VDUP1 influences p27(kip1) stability and cellular processes.

Main Methods:

  • Comparison of fibroblast cell proliferation between VDUP1 knockout (VDUP1-/-) and wild-type cells.
  • Analysis of p27(kip1) expression levels in VDUP1-/- cells.
  • Investigation of VDUP1 interaction with JAB1 and its effect on p27(kip1) stability and translocation.
  • Assessment of VDUP1's impact on activator protein-1 (AP-1) activation and cell proliferation.

Main Results:

  • VDUP1-/- fibroblast cells exhibited more rapid proliferation with reduced p27(kip1) expression.
  • VDUP1 was found to interact with JAB1, restoring JAB1-induced suppression of p27(kip1) stability.
  • VDUP1 inhibited JAB1-mediated translocation of p27(kip1) from the nucleus to the cytoplasm.
  • VDUP1 suppressed JAB1-mediated activator protein-1 activation and cell proliferation.

Conclusions:

  • VDUP1 plays a crucial role in maintaining p27(kip1) stability.
  • VDUP1 acts as a novel regulator of p27(kip1) stability through its interaction with JAB1.
  • These findings highlight VDUP1 as a potential target for therapeutic interventions in cancer.

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