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Acta Neuropathologica

, Volume 67, Issue 3–4, pp 279–288 | Cite as

The dentate gyrus in hypoglycemia: Pathology implicating excititoxin-mediated neuronal necrosis

  • R. Auer
  • H. Kalimo
  • Y. Olsson
  • T. Wieloch
Original Works

Summary

A detailed light- and electron-microscopic study of the damage to the rat dentate gyrus in hypoglycemia was undertaken, in view of the previously advanced hypothesis that hypoglycemic nerve cell injury is mediated by a released neurotoxin. The distribution of neuronal necrosis showed a relationship to the subarachnoid cisterns.

Electron microscopy of the dentate granule cells and their apical dendrites revealed dendrosomal, axon-sparing neuronal pathology. Dentate granule cells were affected first in the dendrites in the outer layer of the stratum moleculare, sparing axons of passage and terminal boutons. Subsequently, the neuronal perikarya were affected, and Wallerian degeneration of axons followed. Cell membrane abnormalities preceded the appearance of mitochondrial flocculent densities and degradation of the cytoskeleton, and are suggested to be early lethal changes.

The observed early dendrotoxic changes, and the dendrosomal, axon-sparing nature of the lesion implicate an excitotoxin-mediated neuronal necrosis in hypoglycemia.

Key words

Dentate Hypoglycemia Excitotoxin Dendrites Neuronal necrosis Membrane breaks Cerebrospinal fluid (CSF) 

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • R. Auer
    • 1
    • 3
  • H. Kalimo
    • 2
  • Y. Olsson
    • 4
  • T. Wieloch
    • 1
  1. 1.Laboratory of Experimental Brain ResearchUniversity of LundLundSweden
  2. 2.Division of Neuropathology, Dept. of PathologyUniversity of GothenburgGothenburgSweden
  3. 3.Dept. of PathologyUniversity of TurkuTurkuFinland
  4. 4.Laboratory of Neuropathology, Institute of PathologyUniversity of UppsalaUppsalaSweden

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