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Evaluating Cell Death Signaling by Immunofluorescence in a Rat Model of Ischemic Stroke
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Ischemic stroke injury is mediated by aberrant Cdk5

Douglas A Meyer1, Melissa I Torres-Altoro1, Zhenjun Tan2

  • 1Department of Psychiatry.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 13, 2014
PubMed

Insights

Aberrant activity of cyclin-dependent kinase 5 (Cdk5) causes neuronal death during ischemic stroke. Inhibiting Cdk5 protects against stroke-induced brain damage and reduces infarct size in rodents.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Pathology

Background:

  • Ischemic stroke is a major cause of death and disability, with limited treatment options.
  • Understanding neuronal injury mechanisms is crucial for developing neuroprotective therapies.

Purpose of the Study:

  • To investigate the role of protein kinase Cdk5 in mediating neuronal death during ischemic stroke.
  • To evaluate Cdk5 inhibition as a potential therapeutic strategy for stroke.

Main Methods:

  • Middle cerebral artery occlusion (MCAO) in vivo and oxygen-glucose deprivation in brain slices to model ischemic stroke.
  • Assessed calpain-dependent conversion of p35 to p25, a Cdk5 activator.
  • Utilized pharmacological inhibition and conditional knock-out (CKO) of Cdk5.
  • Measured neuronal survival, neurotransmission, and infarct volume.

Main Results:

  • Ischemia induced p35 to p25 conversion, leading to aberrant Cdk5 activity.
  • Cdk5 inhibition preserved dopamine neurotransmission, field potentials, and blocked excitotoxicity.
  • Pharmacological inhibition or Cdk5 CKO prevented ischemia-induced neuronal death.
  • Cdk5 CKO significantly reduced infarct size following MCAO.

Conclusions:

  • Aberrant Cdk5 activity is a key driver of neuronal death in ischemic stroke.
  • Targeting Cdk5 offers a promising therapeutic approach for stroke treatment.
Keywords:
Cdk5biomarkercalpainischemianeuroprotectionstroke

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