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Related Experiment Videos

Synaptic noise and multiquantal release at dendritic synapses

H Korn1, F Bausela, S Charpier

  • 1Institute National de la Santé et de la Recherche Médicale U261, Departement des Biotechnologies, Paris, France.

Journal of Neurophysiology
|September 1, 1993
PubMed
Summary

Investigating inhibitory synaptic noise in goldfish Mauthner cells revealed quantal events. Tetrodotoxin (TTX) allowed observation of multiple synchronized release sites, suggesting localized exocytosis.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Transmission

Background:

  • Inhibitory synaptic noise is crucial for neuronal function.
  • Understanding the quantal release of neurotransmitters at synapses is fundamental.
  • The Mauthner cell system in goldfish provides a model for studying neuronal excitability and synaptic integration.

Purpose of the Study:

  • To investigate the quantal nature of inhibitory synaptic noise in the goldfish Mauthner cell dendrite.
  • To apply novel analytical methods for characterizing synaptic noise.
  • To explore the role of release site synchronization in quantal neurotransmission.

Main Methods:

  • Intracellular recordings from the goldfish Mauthner cell lateral dendrite.
  • New automated detection and measurement procedures for synaptic noise.

Related Experiment Videos

  • Analysis of composite amplitude distributions using a Gaussian mixture model.
  • Pharmacological manipulation using tetrodotoxin (TTX) and altered calcium/magnesium concentrations.

    • Main Results:

    • Dendritic inhibitory noise in Mauthner cells is quantal.
    • Tetrodotoxin (TTX) revealed multiple, equally spaced quantal classes, suggesting multiple release sites per terminal.
    • Reduced calcium and increased magnesium confirmed the quantal nature by isolating single miniature events.

    Conclusions:

    • Spontaneous exocytotic events may synchronize at adjacent active zones within single presynaptic terminals.
    • Reducing extracellular calcium concentration is more effective than TTX for isolating single miniature inhibitory postsynaptic currents.
    • These findings offer insights into the mechanisms of neurotransmitter release and synaptic noise.