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Cyclin-dependent kinase-5 prevents neuronal apoptosis through ERK-mediated upregulation of Bcl-2

C X Wang1, J H Song, D K Song

  • 1Department of Medicine and Laboratory Medicine & Pathology, University of Alberta, Edmonton, Canada.

Cell Death and Differentiation
|November 8, 2005
PubMed

Insights

Cyclin-dependent kinase-5 (Cdk5) prevents neuronal apoptosis by increasing Bcl-2 levels. This pathway involves ERK signaling, crucial for brain-derived neurotrophic factor-induced neuronal survival and protection against DNA damage.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Cyclin-dependent kinase-5 (Cdk5) is vital for neuronal survival.
  • The specific targets of Cdk5 within apoptotic pathways are not fully understood.
  • Neuronal differentiation influences susceptibility to apoptosis.

Purpose of the Study:

  • To investigate the role of Cdk5 in preventing neuronal apoptosis.
  • To identify the downstream targets and pathways regulated by Cdk5 in neuronal survival.
  • To elucidate the mechanism by which Cdk5 confers resistance to DNA damage-induced apoptosis.

Main Methods:

  • Utilized SH-SY5Y cells differentiated with retinoic acid (RA) and brain-derived neurotrophic factor (BDNF).
  • Induced apoptosis via DNA damage in differentiated and undifferentiated cells.
  • Assessed the effects of Cdk5 inhibition on apoptotic pathways, including mitochondrial pathway, Bcl-2 expression, and signaling cascades (PI3K/Akt, ERK).

Main Results:

  • RA/BDNF treatment upregulated Bcl-2, inhibiting the mitochondrial apoptotic pathway in differentiated neurons.
  • Cdk5 activation by RA/BDNF was linked to PI3K/Akt and ERK pathway phosphorylation.
  • Inhibition of Cdk5 decreased Bcl-2 expression and sensitized cells to DNA damage.
  • ERK inhibition, but not PI3K/Akt inhibition, blocked Cdk5-mediated Bcl-2 upregulation and cell protection.

Conclusions:

  • Cdk5 kinase activity promotes neuronal survival by upregulating Bcl-2.
  • The ERK signaling pathway is a key mediator of Cdk5-induced Bcl-2 expression.
  • This study highlights an ERK-dependent mechanism for Cdk5-mediated neuronal survival, contributing to BDNF's protective effects.

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