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Synaptic plasticity in the oedematous human cerebral cortex.

O J Castejón1

  • 1Institute of Biological Investigations, Faculty of Medicine, University of Zulia, Maracaibo, Venezuela. ocastejo@cantv.net

Journal of Submicroscopic Cytology and Pathology
|September 17, 2003
PubMed
Summary

Brain injury triggers synaptic plasticity, altering neuronal connections. This study reveals structural changes in synapses, suggesting enhanced excitatory circuits and new synapse formation following trauma.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Neuropathology

Background:

  • Synaptic plasticity is crucial for brain development, maturity, aging, and response to injury.
  • Understanding lesion-induced synaptic plasticity is vital for comprehending brain trauma, tumor, and vascular malformation impacts.

Purpose of the Study:

  • To investigate synaptic structural changes in the human cortex following brain injury.
  • To characterize lesion-induced synaptic plasticity and its potential mechanisms.

Main Methods:

  • Cortical biopsies from neurosurgery patients (brain trauma, tumors, vascular malformations) were analyzed using transmission electron microscopy.
  • Detailed ultrastructural analysis of pre- and postsynaptic elements, dendritic spines, and various synapse types.

Main Results:

  • Observed were enlarged synaptic endings, altered presynaptic shapes, and modified dendritic spines.
  • Identified were numerous activated synapses with specific vesicle and projection features, indicating synaptic remodeling.
  • Evidence of synaptic splitting, new connection formation, and coexisting plasticity with degeneration was found.

Conclusions:

  • Lesion-induced synaptic plasticity involves significant structural alterations, including synapse formation and splitting.
  • Changes suggest an increase in excitatory circuits, potentially linked to seizures observed in some patients.
  • A protein synthesis and transport system involving coated vesicles and polyribosomes appears to support new synapse formation.

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