Cited by 50Neuroscience and Neuropharmacology ResearchCellular transport and secretionMemory and Neural Mechanisms

Different priming states of synaptic vesicles underlie distinct release probabilities at hippocampal excitatory synapses

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Aldahabi, Mohammad, Balint, Flora, Holderith, Noemi, Lorincz, Andrea, Reva, Maria, Nusser, Zoltan·2022·Neuron

Abstract

A stunning example of synaptic diversity is the postsynaptic target cell-type-dependent difference in synaptic efficacy in cortical networks. Here, we show that CA1 pyramidal cell (PC) to fast spiking interneuron (FSIN) connections have 10-fold larger release probability (P v ) than those on oriens lacunosum-moleculare (O-LM) interneurons. Freeze-fracture immunolabeling revealed that different nano-topologies and coupling distances between Ca 2+ channels and release sites (RSs) are not responsible for the distinct P v . Although [Ca 2+ ] transients are 40% larger in FSINs innervating boutons, when [Ca 2+ ] entry is matched in the two bouton populations, EPSCs in O-LM cells are still 7-fold smaller. However, application of a phorbol ester analog resulted in a ∼2.5-fold larger augmentation at PC – O-LM compared to PC – FSIN synapses, suggesting incomplete docking or priming of vesicles. Similar densities of docked vesicles rule out distinct RS occupancies and demonstrate that incompletely primed, but docked, vesicles limit the output of PC – O-LM synapses.

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Authors
Aldahabi, M., Balint, F., Holderith, N., Lorincz, A., Reva, M., & Nusser, Z.
Affiliations
  • Semmelweis University (HU)
  • Centre National de la Recherche Scientifique (FR)
Venue
Neuron
Publisher
Elsevier BV
Published
2022-12
Volume
110
Issue
24
Pages
4144-4161.e7
ISSN
0896-6273 (ISSN-L)
OpenAlex
W4306748254
Cited by
50
References
81
Citations by year
2026: 5 · 2025: 14 · 2024: 20 · 2023: 9 · 2022: 2
FWCI
4.97
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Repository of the Academy's Library (Library of the Hungarian Academy of Sciences) (acceptedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
Funders
H2020 European Research Council (787157)
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 › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
synaptic vesicle priming, release probability, hippocampal CA1, pyramidal neurons, fast-spiking interneurons, oriens-lacunosum moleculare interneurons, synaptic diversity, calcium transients, vesicle docking, phorbol ester, synaptic transmission
MeSH terms
Hippocampus, Interneurons, Probability, Synapses, Synaptic Vesicles

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