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Related Experiment Video

Updated: Jan 21, 2026

Postsynaptic Recordings at Afferent Dendrites Contacting Cochlear Inner Hair Cells: Monitoring Multivesicular Release at a Ribbon Synapse
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The readily-releasable pool dynamically regulates multivesicular release.

Jada H Vaden1, Gokulakrishna Banumurthy1, Eugeny S Gusarevich2

  • 1Department of Neurobiology, University of Alabama at Birmingham, Birmingham, United States.

Elife
|August 1, 2019
PubMed
Summary

Synaptic transmission reliability varies due to the number of vesicles released. Protein kinase A and synapsin regulate this by controlling vesicle pool size, not release probability, impacting synaptic signaling diversity.

Keywords:
RRPcerebellummouseneurosciencesynaptic transmissionvesicle release

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Synaptic transmission reliability is determined by the number of neurotransmitter-filled vesicles released per action potential.
  • Variability in vesicle release contributes to diverse synaptic functions across brain regions.
  • Current models attribute release mode (univesicular vs. multivesicular) to vesicle release probability.

Purpose of the Study:

  • To investigate the mechanisms regulating the number of vesicles released during synaptic transmission.
  • To determine if vesicle release probability or other factors control multivesicular release (MVR).

Main Methods:

  • Experiments were conducted using mouse brain slices.
  • The study analyzed the readily-releasable pool size and its relationship to vesicle release.
  • Investigated the role of protein kinase A and synapsin in regulating vesicle release.

Main Results:

  • The number of released vesicles is regulated by the size of the readily-releasable pool, independent of release probability.
  • Protein kinase A and synapsin dynamically control release site occupancy.
  • These mechanisms dictate the number of vesicles released, influencing MVR.

Conclusions:

  • The readily-releasable pool size, modulated by protein kinase A and synapsin, is a key determinant of multivesicular release.
  • This finding challenges the prevailing view that release probability solely dictates vesicle release mode.
  • These molecular mechanisms contribute to the functional diversity of synaptic signaling.