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Experimental Approaches to Study Mitochondrial Localization and Function of a Nuclear Cell Cycle Kinase, Cdk1
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Experimental Approaches to Study Mitochondrial Localization and Function of a Nuclear Cell Cycle Kinase, Cdk1

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CDK5 phosphorylates DRP1 and drives mitochondrial defects in NMDA-induced neuronal death

Arezu Jahani-Asl1, En Huang2, Isabella Irrcher3

  • 1Department of Cellular and Molecular Medicine, University of Ottawa Brain and Mind Research Institute, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, Canada K1H 8M5, Department of Oncology, Faculty of Medicine, McGill University and Lady Davis Institute at Jewish General Hospital, 3755 Ch de la Côte-Sainte-Catherine, Montréal QC, Canada H3T 1E2.

Human Molecular Genetics
|May 24, 2015
PubMed

Insights

Cyclin-dependent kinase 5 (CDK5) regulates mitochondrial fission protein DRP1, impacting neuronal injury. CDK5 phosphorylation of DRP1 causes mitochondrial fragmentation, a key factor in NMDA-induced neuronal death.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Mitochondrial dysfunction and aberrant cyclin-dependent kinase 5 (CDK5) activation are early indicators of neuronal damage.
  • NMDA-induced excitotoxicity leads to neuronal loss, involving mitochondrial fission defects.

Purpose of the Study:

  • To investigate the role of cytoplasmic CDK5 in regulating mitochondrial morphology during NMDA-induced neuronal injury.
  • To elucidate the mechanism by which CDK5 influences the mitochondrial fission protein dynamin-related protein 1 (DRP1).

Main Methods:

  • Utilized primary neuron cultures and NMDA-induced excitotoxicity models.
  • Investigated CDK5-DRP1 interaction via phosphorylation site analysis (S585).
  • Employed ectopic expression of CDK5 and DRP1 mutants, pharmacological inhibition (Roscovitine), and conditional gene deletion.

Main Results:

  • CDK5 directly phosphorylates DRP1 at serine 585 (S585), promoting mitochondrial fission.
  • Elevated DRP1 phosphorylation at S585 correlates with increased mitochondrial fragmentation in NMDA-treated neurons.
  • Inhibition or deletion of CDK5 reduces DRP1 phosphorylation and rescues mitochondrial fission defects.

Conclusions:

  • Cytoplasmic CDK5 is a critical regulator of mitochondrial fission defects in NMDA-induced neuronal injury.
  • CDK5-mediated phosphorylation of DRP1 at S585 represents a key mechanism linking CDK5 activity to mitochondrial morphology changes and neuronal damage.

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