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Cdk5 phosphorylates a component of the HDAC complex and regulates histone acetylation during neuronal cell death

Amy K Y Fu1, Kwok-Wang Hung, Hovy Ho-Wai Wong

  • 1Division of Life Science, The Hong Kong University of Science and Technology, Hong Kong, SAR, China.

Neuro-Signals
|March 9, 2012
PubMed

Insights

Cyclin-dependent kinase 5 (Cdk5) regulates neuronal survival by controlling histone acetylation. Suppressing Cdk5 protects neurons from apoptosis by modulating epigenetic changes.

Area of Science:

  • Neuroscience
  • Epigenetics
  • Molecular Biology

Background:

  • Cyclin-dependent kinase 5 (Cdk5) is crucial for neural development and survival.
  • Cdk5 dysregulation is linked to neuronal apoptosis and cell cycle protein abnormalities.
  • Previous work showed p35 (Cdk5 activator) interacts with mSds3, suggesting Cdk5's role in gene regulation via chromatin.

Purpose of the Study:

  • To investigate the role of Cdk5 in regulating neuronal survival through epigenetic mechanisms.
  • To determine if Cdk5-dependent phosphorylation of mSds3 occurs in vivo.
  • To explore the link between Cdk5, histone acetylation, and neuronal apoptosis.

Main Methods:

  • Investigated Cdk5-dependent phosphorylation of mSds3 in mouse brain nuclei.
  • Analyzed developmental regulation of mSds3 expression and its interaction with Cdk5 activators.
  • Examined the effect of Cdk5 suppression on histone acetylation and cyclin protein levels in activity-deprived neurons.

Main Results:

  • Cdk5-dependent phosphorylation of mSds3 at Ser228 was confirmed in mouse brain nuclei.
  • mSds3 expression and its interaction with Cdk5 activators are developmentally regulated.
  • Cdk5 suppression protected cerebellar granule neurons from apoptosis induced by activity deprivation, reducing histone H3 acetylation and cyclin upregulation.

Conclusions:

  • Cdk5 regulates neuronal survival via epigenetic control, specifically by modulating histone acetylation.
  • The findings highlight a novel mechanism of Cdk5 in maintaining neuronal homeostasis.
  • Cdk5 activity is critical for activity deprivation-induced apoptosis through epigenetic pathways.

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