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White matter injury mechanisms.

Peter K Stys1

  • 1University of Ottawa and Ottawa Health Research Institute, 725 Parkdale Avenue, Ottawa, Ont. Canada, K1Y 4K9. pstys@ohri.ca

Current Molecular Medicine
|March 23, 2004
PubMed
Summary

Central nervous system (CNS) white matter injury involves ion channel dysfunction and calcium overload. Targeting sodium channels or AMPA/kainate receptors may protect against axonal damage in conditions like stroke.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Neuropathology

Background:

  • White matter in the brain and spinal cord is vulnerable to various insults including anoxia, ischemia, trauma, and autoimmune attacks.
  • Injury to central nervous system (CNS) white matter disrupts signal transmission, leading to severe functional deficits.
  • Axons require a constant supply of oxygen and glucose; injury impairs Na-K-ATPase, causing sodium accumulation and calcium overload.

Purpose of the Study:

  • To elucidate the mechanisms of white matter injury in the CNS.
  • To identify potential therapeutic targets for mitigating axonal damage.
  • To explore neuroprotective strategies for conditions affecting white matter.

Main Methods:

  • Investigated the role of ion channel dysfunction, specifically Na-K-ATPase failure and non-inactivating Na channels, in axonal injury.
  • Examined calcium influx pathways, including reverse Na-Ca exchange and release from intracellular stores via ryanodine receptors.
  • Analyzed excitotoxic mechanisms involving glutamate and AMPA/kainate receptors in glial and myelin injury.

Main Results:

  • Axonal injury involves Na-K-ATPase failure, leading to sodium influx, membrane depolarization, and calcium overload via reverse Na-Ca exchange.
  • Intracellular calcium stores are released through a mechanism involving L-type Ca channels and ryanodine receptors.
  • Glutamate-mediated excitotoxicity through AMPA/kainate receptors contributes to glial and myelin damage.
  • Reoxygenation can paradoxically exacerbate axonal injury and cytoskeletal degradation.

Conclusions:

  • Blockers of voltage-gated sodium channels offer a therapeutic strategy by indirectly inhibiting multiple calcium sourcing pathways.
  • Inhibition of AMPA/kainate receptors demonstrates neuroprotective effects in white matter injury models.
  • Combination therapies targeting specific white matter injury pathways or common cascade points are likely necessary for optimal CNS protection in clinical settings such as stroke and traumatic injury.

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