Cited by 619Cellular transport and secretionNeuroscience and Neuropharmacology ResearchExtracellular vesicles in disease

Total arrest of spontaneous and evoked synaptic transmission but normal synaptogenesis in the absence of Munc13-mediated vesicle priming

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Varoqueaux, Frederique, Sigler, Albrecht, Rhee, Jeong-Seop, Brose, Nils, Enk, Carsten, Reim, Kerstin, Rosenmund, Christian·2002·Proceedings of the National Academy of Sciences

Abstract

Synaptic vesicles must be primed to fusion competence before they can fuse with the plasma membrane in response to increased intracellular Ca 2+ levels. The presynaptic active zone protein Munc13-1 is essential for priming of glutamatergic synaptic vesicles in hippocampal neurons. However, a small subpopulation of synapses in any given glutamatergic nerve cell as well as all γ-aminobutyratergic (GABAergic) synapses are largely independent of Munc13-1. We show here that Munc13-2, the only Munc13 isoform coexpressed with Munc13-1 in hippocampus, is responsible for vesicle priming in Munc13-1 independent hippocampal synapses. Neurons lacking both Munc13-1 and Munc13-2 show neither evoked nor spontaneous release events, yet form normal numbers of synapses with typical ultrastructural features. Thus, the two Munc13 isoforms are completely redundant in GABAergic cells whereas glutamatergic neurons form two types of synapses, one of which is solely Munc13-1 dependent and lacks Munc13-2 whereas the other type employs Munc13-2 as priming factor. We conclude that Munc13-mediated vesicle priming is not a transmitter specific phenomenon but rather a general and essential feature of multiple fast neurotransmitter systems, and that synaptogenesis during development is not dependent on synaptic secretory activity.

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Authors
Varoqueaux, F., Sigler, A., Rhee, J.-S., Brose, N., Enk, C., Reim, K., & Rosenmund, C.
Affiliations
  • Max-Planck-Institute for Experimental Medicine, Department of Molecular Neurobiology, D-37075 Göttingen, Germany; and Max-Planck-Institute for Biophysical Chemistry, Department of Membrane Biophysics, D-37077 Göttingen, Germany
  • Max Planck Institute for Biophysical Chemistry (DE)
Venue
Proceedings of the National Academy of Sciences
Published
2002-06-17
Volume
99
Issue
13
Pages
9037-9042
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2061342956
Cited by
619
References
4
Citations by year
2026: 17 · 2025: 23 · 2024: 23 · 2023: 24 · 2022: 32 · 2021: 29 · 2020: 28 · 2019: 27 · 2018: 26 · 2017: 46 · 2016: 27 · 2015: 22 · 2014: 20 · 2013: 24 · 2012: 31
FWCI
7.66
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • GRO (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion, other-oa)
Funders
Deutsche Forschungsgemeinschaft
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
Keywords
Munc13-1, synaptic vesicle priming, glutamatergic synapses, GABAergic synapses, synaptogenesis, spontaneous synaptic transmission, evoked neurotransmitter release, active zone, vesicle fusion, hippocampal neurons
MeSH terms
Animals, Endocytosis, Hippocampus, Microscopy, Electron, Molecular Sequence Data, Nerve Tissue Proteins, Synaptic Transmission, Synapses, Blotting, Western, Mice, Knockout, Intracellular Signaling Peptides and Proteins, Mice

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