The link between excitotoxic oligodendroglial death and demyelinating diseases

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C Matute1, E Alberdi, M Domercq

  • 1Departamento de Neurociencias, Universidad del País Vasco, 48940 Leioa, Spain. onpmaalc@lg.ehu.es

Trends in Neurosciences
|March 16, 2001
PubMed

Insights

Oligodendrocytes are vulnerable to excitotoxicity from glutamate receptor overactivation, leading to cell death and demyelination. This suggests excitotoxicity may play a role in demyelinating disorders like multiple sclerosis.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathology

Background:

  • Oligodendrocytes, the myelinating cells of the central nervous system (CNS), are susceptible to excitotoxic damage.
  • Glutamate receptors, specifically AMPA and kainate types, mediate this excitotoxicity.
  • Glutamate is released from neurons and glial cells, and oligodendrocytes also regulate extracellular glutamate levels.

Purpose of the Study:

  • To investigate the role of oligodendrocyte excitotoxicity in demyelinating disorders.
  • To explore the link between glutamate homeostasis, receptor activation, and oligodendrocyte death.
  • To assess the potential involvement of excitotoxicity in the pathogenesis of multiple sclerosis.

Main Methods:

  • Analysis of oligodendrocyte vulnerability to excitotoxic signals.
  • Investigation of glutamate receptor activation in oligodendrocytes.
  • Examination of glutamate transporter function in oligodendrocytes.
  • Comparison of excitotoxin-induced demyelination with lesions in multiple sclerosis models.

Main Results:

  • Alterations in glutamate homeostasis can lead to overactivation of AMPA and kainate receptors.
  • This overactivation results in excitotoxic death of oligodendrocytes.
  • Excitotoxin-induced demyelinating lesions resemble those seen in multiple sclerosis.
  • AMPA and kainate receptor antagonists improve neurological scores in experimental autoimmune encephalomyelitis models.

Conclusions:

  • Oligodendrocyte excitotoxicity, driven by glutamate receptor overactivation, is a significant threat to CNS myelin.
  • The findings suggest that oligodendrocyte excitotoxicity may be a key factor in the development of demyelinating diseases.
  • Targeting AMPA and kainate receptors could be a therapeutic strategy for demyelinating disorders such as multiple sclerosis.

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