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Intraventricular infusion of N-methyl-D-aspartate

2. Acute neuronal consequences

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Summary

This study documents the ultrastructural features of acute neuronal injury following N-methyl-d-aspartate (NMDA) receptor activation. NMDA (100 nmol/μl) or vehicle was infused over a 15-min period into the lateral ventricle of adult rats. After perfusion fixation, specimens demonstrating normal and abnormal patterns of vascular permeability to horserdish peroxidase were sampled for ultrastructural analysis. In NMDA-infused rats, brain regions exhibiting protein extravasation contained swollen dendritic profiles and abnormal neuronal perikarya. Although periventricular regions were most severely affected, parenchymal abnormalities were also detected in the cerebral cortex, septum, striatum, thalamus, hypothalamus and cerebellum. Mildly affected dendrites contained dark compact mitochondria, while in severely swollen dendrites mitochrondia were enlarged with ruptured cristae. Focal sites of plasma membrane disruption were also detected within swollen dendrites. Swollen neurons commonly displayed peripheral pallor and increased numbers of cytoplasmic vacuoles. Other neurons appeared dark and shrunken, some containing disrupted mitochrondria and pyknotic nuclei. Pretreatment with the NMDA antagonist MK-801 (2 mg/kg) attenuated the neuronal and dendritic alterations. In conditions where cerebrospinal fluid levels of glutamate are abnormally elevated, excessive NMDA receptor activation may lead to early vascular and neuronal complications which could work in concert to promote brain injury.

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Supported by USPHS Grants NS-05820 and NS-27127 and by the American Heart Association Grant-in-Aid with funds contributed by the American Heart Association

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Dietrich, W.D., Halley, M., Alonso, O. et al. Intraventricular infusion of N-methyl-D-aspartate. Acta Neuropathol 84, 630–637 (1992). https://doi.org/10.1007/BF00227740

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Key words

  • Dentrites
  • Excitotoxicity
  • Glutamate
  • N-Methyl-d-aspartate
  • Electron microscopy