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Morphological astrocytic changes in complicated human brain trauma. A light and electron microscopic study

O J Castejón1

  • 1Facultad de Medicina, Universidad del Zulia, Venezuela.

Brain Injury
|May 20, 1998
PubMed
Summary

Brain trauma causes significant astrocyte changes, including swelling and altered structures. These cellular alterations correlate with neurological deficits and blood-brain barrier disruption in patients.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathology

Background:

  • Human brain trauma, particularly with subdural hematoma or hygroma, leads to complex cellular responses.
  • Astrocytes play a crucial role in brain homeostasis and injury response.

Purpose of the Study:

  • To analyze astrocytic changes and reactivity in human brain trauma.
  • To correlate these ultrastructural changes with posttraumatic neurological deficits and blood-brain barrier disruption.

Main Methods:

  • Examination of cortical biopsies from frontal, temporal, and parietal regions of nine patients.
  • Utilized light microscopy and transmission electron microscopy to analyze astrocyte morphology and ultrastructure.

Main Results:

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  • Identified various astrocyte morphologies including clear/dense, binucleated, multinucleated, and hypertrophic reactive astrocytes in vasogenic brain edema.
  • Observed perineuronal astrocytes compressing degenerated neurons and identified glycogen-depleted/rich astrocytes.
  • Severe edema showed loss of synaptic ensheathment, disrupted astrocyte end-feet, and compromised gap junctions.

    • Conclusions:

    • Astrocytic ultrastructural changes, including swelling and altered organelle content, are prominent in brain trauma.
    • Disruption of the blood-brain barrier and astrocytic structural integrity are linked to neurological deficits and neurobehavioral disorders post-trauma.