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Facilitation and depression at single central synapses

C F Stevens1, Y Wang

  • 1Howard Hughes Medical Institute, Salk Institute Molecular Neurobiology Laboratory, La Jolla, California 92037, USA.

Neuron
|April 1, 1995
PubMed
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Minimal stimulation reveals single synapses in the hippocampus release neurotransmitter reliably with paired pulses. Each synapse has one release site that refills in about 20 ms.

Area of Science:

  • Neuroscience
  • Synaptic Transmission
  • Cellular Electrophysiology

Background:

  • Understanding synaptic transmission reliability is crucial for neural function.
  • Minimal stimulation techniques aim to isolate single synaptic events.
  • Hippocampal CA1 pyramidal neurons are key in learning and memory.

Purpose of the Study:

  • To investigate the release probability and dynamics of individual hippocampal synapses.
  • To determine if single synapses possess unique release site characteristics.
  • To analyze the refilling time of synaptic release sites.

Main Methods:

  • Whole-cell recording from CA1 hippocampal pyramidal neurons.
  • Minimal stimulation of Schaffer collaterals to evoke single synaptic currents.

Related Experiment Videos

  • Paired-pulse stimulation protocols to assess release reliability.
  • Statistical analysis of synaptic transmission failures.

    • Main Results:

    • Minimal stimulation predominantly activates single synapses (>90%).
    • Single synapses exhibit unreliable transmission but reliable release upon paired-pulse stimulation (50 ms interval).
    • Individual synapses appear to have a single functional release site, refilling within approximately 20 ms.

    Conclusions:

    • Hippocampal synapses possess a single, rate-limiting release site.
    • Paired-pulse facilitation enhances neurotransmitter release reliability at single synapses.
    • Synaptic release site refilling dynamics are on the order of 20 ms.