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Related Experiment Videos

Quantal release of serotonin.

D Bruns1, D Riedel, J Klingauf

  • 1Max-Planck Institute for Biophysical Chemistry, Department of Neurobiology, Göttingen, Germany. dbruns@mpibpc.gwdg.de

Neuron
|November 22, 2000
PubMed
Summary
This summary is machine-generated.

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Quantal variability in small synaptic vesicles (SSVs) stems from vesicle volume, indicating constant serotonin concentration. Large dense-cored vesicles (LDCVs) exhibit greater release variability and slower bulk release.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Quantal variability, the fluctuation in neurotransmitter release per vesicle, is fundamental to synaptic transmission.
  • Small synaptic vesicles (SSVs) and large dense-cored vesicles (LDCVs) differ in size, content, and release dynamics, yet the origins of their quantal variability are not fully understood.

Purpose of the Study:

  • To investigate the biophysical basis of quantal variability in both SSVs and LDCVs.
  • To determine if intravesicular concentration and complete discharge explain transmitter release variability.

Main Methods:

  • Utilized leech serotonergic Retzius neurons as a model system.
  • Employed combined amperometry and morphological analysis to quantify transmitter release and vesicle properties.

Related Experiment Videos

  • Correlated vesicle volume with released transmitter amount.

    • Main Results:

    • Transmitter release from SSVs is proportional to vesicle volume, suggesting constant intravesicular concentration and complete discharge.
    • Transmitter release from LDCVs shows higher variability than predicted by size alone, with slower bulk release compared to SSVs.
    • Average differences in released transmitter between SSVs and LDCVs correlate with their size differences, implying similar storage concentrations.

    Conclusions:

    • Quantal variability in SSVs is primarily determined by vesicle volume.
    • LDCV release variability is influenced by factors beyond simple size, and their release kinetics differ from SSVs.
    • Neurotransmitter storage concentration is likely consistent across both SSVs and LDCVs.