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Indirect glutamate neurotoxicity

K W Yoon1, T Fuse, P T Shah

  • 1Department of Surgery, St. Louis University Health Science Center, MO 63110-0250, USA.

Journal of Neurotrauma
|March 25, 1998
PubMed
Summary
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Glutamate exposure releases an unknown toxin that damages uninjured cells, causing cell death. This indirect neurotoxicity, unlike primary toxicity, is not blocked by receptor antagonists.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Toxicology

Background:

  • Glutamate is a key neurotransmitter.
  • Excitotoxicity, or glutamate toxicity, is implicated in neuronal damage.
  • Mechanisms of indirect glutamate toxicity are not fully understood.

Purpose of the Study:

  • To investigate the propagation of glutamate-induced neurotoxicity to uninjured cells.
  • To characterize the nature of the indirect toxic effect.

Main Methods:

  • Dissociated rat hippocampal cultures were exposed to glutamate.
  • Media from exposed cultures was collected and applied to naive cultures.
  • Primary and transferred toxicity were assessed using morphological and molecular markers of cell death.
  • The effect of ionotropic glutamate receptor antagonists was tested.

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Main Results:

  • Indirect glutamate toxicity was observed in naive cells exposed to conditioned media.
  • This toxicity peaked 5 minutes after initial glutamate exposure.
  • Unlike primary toxicity, indirect toxicity was not inhibited by ionotropic glutamate receptor antagonists.
  • Both primary and indirect toxicity induced chromatin condensation, nuclear fragmentation, and DNA damage, indicative of apoptosis and necrosis.

Conclusions:

  • Glutamate exposure releases an extracellular neurotoxin that induces cell death in uninjured neurons.
  • This indirect neurotoxicity pathway is distinct from primary excitotoxicity and is not mediated by ionotropic glutamate receptors.
  • The findings suggest a novel mechanism of neuronal damage propagation in the brain.