The readily-releasable pool dynamically regulates multivesicular release.
Open accessAbstract
The number of neurotransmitter-filled vesicles released into the synaptic cleft with each action potential dictates the reliability of synaptic transmission. Variability of this fundamental property provides diversity of synaptic function across brain regions, but the source of this variability is unclear. The prevailing view is that release of a single (univesicular release, UVR) or multiple vesicles (multivesicular release, MVR) reflects variability in vesicle release probability, a notion that is well-supported by the calcium-dependence of release mode. However, using mouse brain slices, we now demonstrate that the number of vesicles released is regulated by the size of the readily-releasable pool, upstream of vesicle release probability. Our results point to a model wherein protein kinase A and its vesicle-associated target, synapsin, dynamically control release site occupancy to dictate the number of vesicles released without altering release probability. Together these findings define molecular mechanisms that control MVR and functional diversity of synaptic signaling.
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Forskolin is a widely used adenylyl cyclase activator.
“To maximally activate the cAMP pathway, we applied forskolin, a widely used AC activator [28–31,33,48].”
From Presynaptic cAMP-PKA-mediated potentiation induces reconfiguration of synaptic vesicle pools and channel-vesicle coupling at hippocampal mossy fiber boutons (2024) · cites this paper as [48]
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“To maximally activate the cAMP pathway, we applied forskolin, a widely used AC activator [28–31 ,33 ,48 To determine the locus of chemical potentiation, we analyzed the paired-pulse ratio (PPR; EPSC 2 /EPSC 1 ; Fig 1D).”
- Authors
- Vaden, J. H., Banumurthy, G., Gusarevich, E. S., Overstreet-Wadiche, L., & Wadiche, J. I.
- Affiliations
- University of Alabama at Birmingham (US)
- Northern (Arctic) Federal University (RU)
- Department of Neurobiology, University of Alabama at Birmingham, Birmingham, United States
- Corresponding author
- Wadiche, Jacques I
- ORCID
- Venue
- eLife
- Publisher
- eLife Sciences Publications, Ltd
- Published
- 2019-07-31
- Volume
- 8
- ISSN
- 2050-084X (ISSN-L)
- PMC
- PMC6716946
- OpenAlex
- W2965372978
- Cited by
- 61
- References
- 4
- Citations by year
- 2026: 3 · 2025: 6 · 2024: 17 · 2023: 5 · 2022: 9 · 2021: 10 · 2020: 8 · 2019: 3
- FWCI
- 3.58
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- eLife (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Institute of Neurological Disorders and Stroke (NS065920, NS064025, NS105438)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
- Keywords
- multivesicular release, readily releasable pool, synaptic vesicle release, release probability, protein kinase A, synapsin, neurotransmitter release, calcium-dependent release
- MeSH terms
- Animals, Calcium, Models, Biological, Synaptic Transmission, Synaptic Vesicles, Synapsins, Cyclic AMP-Dependent Protein Kinases, Calcium Signaling, Mice
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