Cited by 405Neuroscience and Neuropharmacology ResearchCellular transport and secretionIon channel regulation and function

Release probability of hippocampal glutamatergic terminals scales with the size of the active zone

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Holderith, Noemi, Lorincz, Andrea, Katona, Gergely, Rózsa, Balázs, Kulik, Akos, Watanabe, Masahiko, Nusser, Zoltan·2012·Nature Neuroscience

Abstract

Cortical synapses have structural, molecular and functional heterogeneity; our knowledge regarding the relationship between their ultrastructural and functional parameters is still fragmented. Here we asked how the neurotransmitter release probability and presynaptic [Ca(2+)] transients relate to the ultrastructure of rat hippocampal glutamatergic axon terminals. Two-photon Ca(2+) imaging-derived optical quantal analysis and correlated electron microscopic reconstructions revealed a tight correlation between the release probability and the active-zone area. Peak amplitude of [Ca(2+)] transients in single boutons also positively correlated with the active-zone area. Freeze-fracture immunogold labeling revealed that the voltage-gated calcium channel subunit Cav2.1 and the presynaptic protein Rim1/2 are confined to the active zone and their numbers scale linearly with the active-zone area. Gold particles labeling Cav2.1 were nonrandomly distributed in the active zones. Our results demonstrate that the numbers of several active-zone proteins, including presynaptic calcium channels, as well as the number of docked vesicles and the release probability, scale linearly with the active-zone area.

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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.”

    From A trans-synaptic nanocolumn aligns neurotransmitter release to receptors (2016) · cites this paper as [24]

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  • The number of fusion events must be correlated with the size of presynaptic terminals for successful exo-endocytosis coupling.

    “Thus, the number of fusion events must be correlated with the size of presynaptic terminals61 for successful exo-endocytosis coupling.”

    From Membrane compression by synaptic vesicle exocytosis triggers ultrafast endocytosis (2023) · cites this paper as [61]

    The Results ('Large variability in release probability and short-term plasticity of axon terminals'; page unavailable) report a significant positive correlation between release probability and bouton volume. Release probability is not the number of fusion events, and the paper does not establish that such a correlation is necessary for successful exo-endocytosis coupling. (LLM, conf=0.85)

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Authors
Holderith, N., Lorincz, A., Katona, G., Rózsa, B., Kulik, A., Watanabe, M., & Nusser, Z.
Affiliations
  • HUN-REN Institute of Experimental Medicine (HU)
  • Hokkaido University (JP)
Venue
Nature Neuroscience
Published
2012-06-10
Volume
15
Issue
7
Pages
988-997
ISSN
  • 1097-6256 (ISSN-L)
  • 1546-1726
OpenAlex
W2093514926
Cited by
405
References
56
Citations by year
2026: 3 · 2025: 15 · 2024: 29 · 2023: 29 · 2022: 30 · 2021: 32 · 2020: 38 · 2019: 28 · 2018: 39 · 2017: 24 · 2016: 30 · 2015: 36 · 2014: 34 · 2013: 32 · 2012: 6
FWCI
14.24
Type
journal article
Language
en
Update notices
erratum (2015-12-29)
Open access
Locations
  • Nature Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • Repository of the Academy's Library (Library of the Hungarian Academy of Sciences) (acceptedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
Wellcome Trust (083484, 090197, 094513, 083484/Z/07/Z, 090197/Z/09/Z, 094513/Z/10/Z)
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 › Ion channel regulation and function
Keywords
release probability, active zone, glutamatergic synapses, CA3 pyramidal cells, voltage-gated calcium channels, Cav2.1, docked vesicles, synaptic ultrastructure, two-photon calcium imaging
MeSH terms
Action Potentials, Animals, Hippocampus, Male, Random Allocation, Synaptic Vesicles, Rats, Wistar, Presynaptic Terminals, Calcium Channels, N-Type, Rats

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