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Related Experiment Videos

Transmitter timecourse in the synaptic cleft: its role in central synaptic function

J D Clements1

  • 1John Curtin School of Medical Research, Australian National University, Canberra, Australia.

Trends in Neurosciences
|May 1, 1996
PubMed
Summary

Synaptic transmission speed is determined by how quickly neurotransmitters clear the synaptic cleft. This clearance is biphasic, impacting postsynaptic responses and receptor saturation.

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Area of Science:

  • Neuroscience
  • Synaptic Physiology
  • Computational Biology

Background:

  • Neurotransmitter clearance from the synaptic cleft is critical for regulating synaptic function.
  • It influences the duration of postsynaptic potentials and receptor binding.
  • Understanding clearance kinetics is key to comprehending synaptic transmission dynamics.

Purpose of the Study:

  • To estimate the time course of neurotransmitter clearance in central synapses.
  • To determine the concentration and clearance kinetics of synaptic transmitters.
  • To assess the impact of transmitter clearance on postsynaptic receptor activation.

Main Methods:

  • Theoretical modeling of synaptic transmission.
  • Experimental analysis using low-affinity competitive antagonists.

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  • Application of these methods to various central synapse types.

    • Main Results:

    • Neurotransmitter clearance is a biphasic process with time constants of ~100 microseconds and 2 milliseconds.
    • Peak transmitter concentrations in the synaptic cleft range from 1-5 mM.
    • Even brief transmitter pulses are sufficient to saturate postsynaptic receptors (GABA, glycine, NMDA) and prolong AMPA currents.

    Conclusions:

    • The speed of neurotransmitter clearance significantly shapes synaptic responses.
    • Biphasic clearance kinetics are a common feature across studied central synapses.
    • Transmitter clearance dynamics directly influence postsynaptic receptor occupancy and activation duration.