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Related Experiment Videos

Activity-induced changes of spine morphology.

Irina Nikonenko1, Pascal Jourdain, Stefano Alberi

  • 1Division of Neuropharmacology, Centre Médical Universitaire, Geneva, Switzerland.

Hippocampus
|November 21, 2002
PubMed
Summary

Synaptic activity rapidly alters spine morphology and postsynaptic density (PSD) organization in developing neural tissue. These activity-dependent structural changes, often calcium and NMDA receptor-mediated, may underlie synaptic efficacy modifications.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Plasticity

Background:

  • Spine morphology exhibits significant plasticity, particularly in developing neural tissues.
  • Changes in spine shape and postsynaptic density (PSD) organization occur rapidly, within minutes, in organotypic slice cultures.
  • Synaptic activation is a key driver for many of these structural modifications.

Purpose of the Study:

  • To review the characteristics of activity-dependent morphological changes in neuronal spines.
  • To discuss the relationship between various structural plasticity mechanisms.
  • To explore the functional significance of structural plasticity in synaptic efficacy.

Main Methods:

  • Review of existing literature on spine morphology and plasticity.

Related Experiment Videos

  • Analysis of activity-dependent structural changes in organotypic slice cultures.
  • Focus on calcium and NMDA receptor-dependent mechanisms.

    • Main Results:

    • Synaptic activation induces various structural changes, including filopodia formation, spine enlargement, perforated PSDs, new spine appearance, and multiple synapse boutons (MSBs).
    • These activity-dependent processes are largely mediated by calcium influx and NMDA receptor activation.
    • Observed structural changes exhibit varied time courses, with some rapid and others delayed.

    Conclusions:

    • Structural plasticity of dendritic spines is a dynamic process influenced by synaptic activity.
    • The diverse morphological changes observed likely contribute to alterations in synaptic efficacy.
    • Understanding the interplay and timing of these structural modifications is crucial for elucidating their functional roles.