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p53, apoptosis and axon-guidance molecules

H Arakawa1

  • 1Cancer Medicine and Biophysics Division, National Cancer Center Research Institute, 5-1-1 Tsukiji, Tokyo 104-0045, Japan. harakawa@gan2.res.ncc.go.jp

Cell Death and Differentiation
|April 9, 2005
PubMed

Insights

The tumor suppressor p53 regulates apoptosis via target genes. It controls UNC5B, an axon guidance molecule, linking these molecules to cancer development.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Neuroscience

Background:

  • The p53 tumor-suppressor gene is crucial for regulating apoptosis.
  • Apoptosis, or programmed cell death, is a vital process for development and tissue homeostasis.
  • Dysregulation of apoptosis is a hallmark of cancer.

Purpose of the Study:

  • To investigate the regulatory relationship between the p53 gene and the axon-guidance molecule UNC5B.
  • To elucidate the role of UNC5B in p53-mediated apoptosis.
  • To explore the potential link between axon-guidance molecules and cancer.

Main Methods:

  • Analysis of p53's transcriptional regulation of UNC5B expression.
  • Investigating the role of UNC5B in apoptosis under different netrin-1 conditions.
  • Examining the expression of axon-guidance molecules in human cancers.

Main Results:

  • p53 directly regulates the expression of UNC5B, a netrin-1 receptor.
  • UNC5B mediates p53-dependent apoptosis in the absence of netrin-1.
  • Netrin-1 binding to UNC5B inhibits p53-induced apoptosis.
  • Several axon-guidance molecules are inactivated and p53-regulated in human cancers.

Conclusions:

  • The p53 tumor suppressor directly controls the expression of the axon-guidance molecule UNC5B.
  • UNC5B plays a dual role in apoptosis, dependent on netrin-1 availability.
  • A significant link exists between axon-guidance pathways and tumorigenesis, mediated by p53.

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