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Brain temperature modifies glutamate neurotoxicity in vivo
1Department of Neurosurgery, Yamaguchi University School of Medicine, Ube, Japan.
Journal of Neurotrauma
|May 4, 1999
Summary
Mild hypothermia protects against glutamate excitotoxicity, reducing brain damage, while mild hyperthermia worsens it. Temperature affects glutamate diffusion, explaining these effects.
Area of Science:
- Neuroscience
- Neuroprotection
- Neurotoxicology
Background:
- Glutamate excitotoxicity is a key mechanism in brain injury.
- The influence of body temperature on excitotoxicity is not fully understood.
Purpose of the Study:
- To investigate the impact of mild hypothermia and hyperthermia on glutamate-induced brain damage.
- To explore the role of temperature-dependent glutamate diffusion in these effects.
Main Methods:
- Inducing mild hypothermia (32°C) and hyperthermia (40°C) in rats.
- Creating glutamate-induced cortical lesions using microdialysis.
- Quantifying lesion volume histologically and assessing 14C-sucrose diffusion.
Main Results:
- Mild hypothermia significantly reduced lesion volume.
- Mild hyperthermia significantly increased lesion volume.
- Increased brain temperature enhanced the diffusion of exogenous substances.
Conclusions:
- Brain temperature critically modulates glutamate excitotoxicity.
- Altered extracellular glutamate diffusion is a likely mechanism for temperature-induced neuroprotection or harm.