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Related Experiment Videos

Periinfarct depolarizations

K A Hossmann1

  • 1Department of Experimental Neurology, Max Planck Institute for Neurological Research, Cologne, Germany.

Cerebrovascular and Brain Metabolism Reviews
|January 1, 1996
PubMed
Summary
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Repetitive spreading depression (SD)-like events worsen brain damage after stroke by causing hypoxia. Suppressing these depolarizations can reduce infarct size and improve outcomes.

Area of Science:

  • Neuroscience
  • Ischemic Stroke Research
  • Cerebral Blood Flow Dynamics

Background:

  • Focal ischemic lesions trigger spreading depression (SD)-like depolarizations.
  • These events propagate across the hemisphere, detected by diffusion-weighted MRI.
  • SD-like depolarizations exacerbate metabolic disturbances and can expand infarct size.

Purpose of the Study:

  • To investigate the role of periinfarct depolarizations in focal ischemic injury.
  • To explore the impact of these depolarizations on oxygen supply and cellular stress.
  • To evaluate the therapeutic potential of suppressing periinfarct depolarizations.

Main Methods:

  • Monitoring spreading depression (SD)-like events in focal ischemic lesions.
  • Assessing metabolic disturbances and fluid shifts using diffusion-weighted MRI.

Related Experiment Videos

  • Analyzing gene expression (immediate early genes, stress proteins) and protein synthesis.
  • Administering NMDA and non-NMDA glutamate receptor antagonists post-ischemia.

    • Main Results:

    • Periinfarct SDs induce immediate early gene expression in non-core regions.
    • Hypoxic episodes during SDs in the penumbra trigger stress responses and suppress protein synthesis.
    • Severe penumbral SDs can lead to infarct expansion.
    • Glutamate receptor antagonists suppressed periinfarct depolarizations, reversed protein synthesis suppression, and reduced infarct size.

    Conclusions:

    • Periinfarct depolarizations significantly aggravate focal ischemic injury.
    • Therapeutic suppression of periinfarct depolarizations offers a promising strategy to minimize infarct size.
    • Targeting glutamate receptors may be a viable approach for stroke treatment.