Cited by 246Neuroscience and Neuropharmacology ResearchCellular transport and secretionMemory and Neural Mechanisms

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Structural Determinants of Transmission at Large Hippocampal Mossy Fiber Synapses

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Rollenhagen, Astrid, Sätzler, Kurt, Rodríguez, E. Patricia, Jonas, Peter, Frotscher, Michael, Lübke, Joachim H. R.·2007·The Journal of Neuroscience

Abstract

Synapses are the key elements for signal processing and plasticity in the brain. To determine the structural factors underlying the unique functional properties of the hippocampal mossy fiber synapse, the complete quantitative geometry was investigated, using electron microscopy of serial ultrathin sections followed by computer-assisted three-dimensional reconstruction. In particular, parameters relevant for transmitter release and synaptic plasticity were examined. Two membrane specializations were found: active zones (AZs), transmitter release sites, and puncta adherentia, putative adhesion complexes. Individual boutons had, on average, 25 AZs (range, 7–45) that varied in shape and size (mean, 0.1 μm 2 ; range, 0.07–0.17 μm 2 ). The mean distance between individual AZs was 0.45 μm. Mossy fiber boutons and their target structures were mostly ensheathed by astrocytes, but fine glial processes never reached the active zones. Two structural factors are likely to promote synaptic cross talk: the short distance between AZs and the absence of fine glial processes at AZs. Thus, synaptic cross talk may contribute to the efficacy of hippocampal mossy fiber synapses. On average, a bouton contained 20,400 synaptic vesicles; ∼900 vesicles were located within 60 nm from the active zone, ∼4400 between 60 and 200 nm, and the remaining beyond 200 nm, suggesting large readily releasable, recycling, and reserve pools. The organization of the different pools may be a key structural correlate of presynaptic plasticity at this synapse. Thus, the mossy fiber bouton differs fundamentally in structure and function from the calyx of Held and other central synapses.

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Metadata

Authors
Rollenhagen, A., Sätzler, K., Rodríguez, E. P., Jonas, P., Frotscher, M., & Lübke, J. H. R.
Affiliations
  • Forschungszentrum Jülich (DE)
  • University of Ulster (GB)
  • University of Freiburg (DE)
Corresponding author
Lübke, Joachim H. R.
Venue
The Journal of Neuroscience
Published
2007-09-26
Volume
27
Issue
39
Pages
10434-10444
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1976225114
Cited by
246
References
52
Citations by year
2026: 5 · 2025: 16 · 2024: 19 · 2023: 15 · 2022: 8 · 2021: 18 · 2020: 15 · 2019: 25 · 2018: 18 · 2017: 18 · 2016: 9 · 2015: 9 · 2014: 16 · 2013: 5 · 2012: 14
FWCI
3.72
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)
  • JuSER (Forschungszentrum Jülich) (submittedVersion, other-oa)
Funders
Deutsche Forschungsgemeinschaft
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
active zone, synaptic vesicles, readily releasable pool, synaptic vesicle recycling, reserve pool, presynaptic plasticity, 3D reconstruction
MeSH terms
Animals, Microscopy, Electron, Synaptic Transmission, Neuronal Plasticity, Synapses, Synaptic Vesicles, Rats, Wistar, Neurotransmitter Agents, Mossy Fibers, Hippocampal, Imaging, Three-Dimensional, Models, Animal, Rats

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