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Stabilization and activation of p53 induced by Cdk5 contributes to neuronal cell death

Jong-Hee Lee1, Hea-Sook Kim, Sung-Jin Lee

  • 1Department of Life Science, Division of Molecular and Life Science, Systems-Biodynamics NCRC, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea.

Journal of Cell Science
|June 27, 2007
PubMed

Insights

Cyclin-dependent kinase 5 (Cdk5) stabilizes the tumor suppressor p53 protein in neurons by preventing its degradation. This Cdk5-mediated p53 stabilization promotes apoptosis in response to cellular stress.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cellular Biology

Background:

  • p53 is a crucial tumor suppressor regulating cellular stress responses and apoptosis.
  • p53 stability is primarily controlled by phosphorylation and proteasomal degradation.
  • Cyclin-dependent kinase 5 (Cdk5) is vital in the central nervous system and implicated in neuronal degeneration.

Purpose of the Study:

  • To investigate the interaction between Cdk5 and p53.
  • To elucidate the role of Cdk5 in regulating p53 stability and function in neurons.
  • To understand the molecular mechanisms linking Cdk5 activity to neuronal apoptosis.

Main Methods:

  • In vitro kinase assays to assess Cdk5 phosphorylation of p53.
  • Nuclear fractionation and co-immunoprecipitation to study protein interactions.
  • Western blotting to detect p53 ubiquitylation and acetylation.
  • Analysis of pro-apoptotic gene expression and apoptosis induction.

Main Results:

  • Cdk5 directly interacts with and stabilizes p53, increasing its nuclear accumulation.
  • Cdk5 phosphorylates p53 at Ser15, Ser33, and Ser46, particularly under genotoxic and oxidative stress.
  • Cdk5 disrupts the p53-Hdm2 interaction, inhibiting p53 ubiquitylation and degradation.
  • Cdk5 enhances p300 coactivator binding to p53, promoting p53 acetylation and transcriptional activity.
  • Stabilized p53 induces pro-apoptotic genes, leading to mitochondria-mediated apoptosis.

Conclusions:

  • Cdk5 plays a novel role in stabilizing p53 through posttranslational modifications.
  • Cdk5-mediated p53 stabilization enhances its transcriptional activity, driving neuronal apoptosis.
  • These findings reveal a new mechanism for Cdk5 in neuronal degeneration and stress response.

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