Cited by 85Neuroscience and Neuropharmacology ResearchIon channel regulation and functionCellular transport and secretion

The Number and Organization of Ca 2+ Channels in the Active Zone Shapes Neurotransmitter Release from Schaffer Collateral Synapses

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Scimemi, Annalisa, Diamond, Jeffrey S.·2012·The Journal of Neuroscience

Abstract

Fast synaptic transmission requires tight colocalization of Ca 2+ channels and neurotransmitter vesicles. It is generally thought that Ca 2+ channels are expressed abundantly in presynaptic active zones, that vesicles within the same active zone have similar release properties, and that significant vesicle depletion only occurs at synapses with high release probability. Here we show, at excitatory CA3→CA1 synapses in mouse hippocampus, that release from individual vesicles is generally triggered by only one Ca 2+ channel and that only few functional Ca 2+ channels may be spread in the active zone at variable distances to neighboring neurotransmitter vesicles. Using morphologically realistic Monte Carlo simulations, we show that this arrangement leads to a widely heterogeneous distribution of release probability across the vesicles docked at the active zone, and that depletion of the vesicles closest to Ca 2+ channels can account for the Ca 2+ dependence of short-term plasticity at these synapses. These findings challenge the prevailing view that efficient synaptic transmission requires numerous presynaptic Ca 2+ channels in the active zone, and indicate that the relative arrangement of Ca 2+ channels and vesicles contributes to the heterogeneity of release probability within and across synapses and to vesicle depletion at small central synapses with low average release probability.

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Crossref · 10.1523/jneurosci.3827-12.2012

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  • Observations in small CNS synapses of both clustered and random distribution of Ca2+ channels, and emerging evidence for channel mobility as an equalizer of Pr for vesicles independent of channel positioning, suggest that their precise distribution may not be the sole determinant of the active zone release likelihood landscape.

    “However, observations in small CNS synapses of both clustered24,25 and random distribution of Ca2+ channels26, and emerging evidence for channel mobility as an equalizer of Pr for vesicles independent of channel positioning27 suggest that their precise distribution may not be the sole determinant of the AZ release likelihood landscape.”

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Authors
Scimemi, A., & Diamond, J. S.
Affiliations
National Institutes of Health (US)
Venue
The Journal of Neuroscience
Published
2012-12-12
Volume
32
Issue
50
Pages
18157-18176
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1978630448
Cited by
85
References
61
Citations by year
2026: 6 · 2025: 4 · 2024: 5 · 2023: 5 · 2022: 4 · 2021: 5 · 2020: 7 · 2019: 11 · 2018: 5 · 2017: 4 · 2016: 9 · 2015: 8 · 2014: 10 · 2013: 2
FWCI
2.64
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (ZIANS002986, Z01NS002986)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
calcium channels, active zone, neurotransmitter release, Schaffer collateral synapses, CA3-CA1 synapses, hippocampus, vesicle depletion, short-term plasticity, vesicle docking, synaptic transmission, Monte Carlo simulation
MeSH terms
Animals, Mice, Inbred C57BL, Models, Neurological, Monte Carlo Method, Synaptic Transmission, Neurons, Synapses, Synaptic Vesicles, Calcium Channels, Neurotransmitter Agents, Patch-Clamp Techniques, Excitatory Postsynaptic Potentials, Mice, CA1 Region, Hippocampal, CA3 Region, Hippocampal

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