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Related Experiment Videos

Time resolved calcium microdomains and synaptic transmission

R Llinás1, M Sugimori, R B Silver

  • 1Department of Physiology and Neuroscience, New York University Medical Center, NY 10016, USA.

Journal of Physiology, Paris
|January 1, 1995
PubMed
Summary

Calcium entry at the squid giant synapse peaks within 200 microseconds after action potentials. This calcium influx, crucial for neurotransmitter release, lasts about 800 microseconds.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Biophysics

Background:

  • Neurotransmitter release is triggered by calcium influx into presynaptic terminals.
  • Understanding the precise timing of calcium entry is critical for synaptic function.

Purpose of the Study:

  • To investigate the time course of calcium entry that triggers neurotransmitter release at the squid giant synapse.
  • To correlate calcium entry dynamics with action potential activity.

Main Methods:

  • Utilized n-aequorin-J luminescence imaging within the presynaptic terminal.
  • Employed a high-speed video system capable of acquiring 4000 frames per second.
  • Measured intracellular calcium dynamics in response to action potentials.

Main Results:

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  • Calcium entry, triggered by action potentials, reached its peak within 200 microseconds.
  • The overall duration of calcium entry was approximately 800 microseconds.
  • The observed time course closely matched presynaptic calcium currents measured by voltage clamp.

Conclusions:

  • The study precisely quantifies the rapid time course of calcium entry at the squid giant synapse.
  • The findings provide direct evidence linking action potential-evoked calcium influx to synaptic release timing.
  • Results support the role of voltage-gated calcium channels in shaping synaptic transmission dynamics.