Cited by 102Neuroscience and Neuropharmacology ResearchCellular transport and secretionGenetics and Neurodevelopmental Disorders

The Munc13 proteins differentially regulate readily releasable pool dynamics and calcium-dependent recovery at a central synapse

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Chen, Zuxin, Cooper, Benjamin, Kalla, Stefan, Varoqueaux, Frederique, Young, Samuel M.·2013·The Journal of Neuroscience

Abstract

The Munc13 gene family encodes molecules located at the synaptic active zone that regulate the reliability of synapses to encode information over a wide range of frequencies in response to action potentials. In the CNS, proteins of the Munc13 family are critical in regulating neurotransmitter release and synaptic plasticity. Although Munc13-1 is essential for synaptic transmission, it is paradoxical that Munc13-2 and Munc13-3 are functionally dispensable at some synapses, although their loss in other synapses leads to increases in frequency-dependent facilitation. We addressed this issue at the calyx of Held synapse, a giant glutamatergic synapse that we found to express all these Munc13 isoforms. We studied their roles in the regulation of synaptic transmission and their impact on the reliability of information transfer. Through detailed electrophysiological analyses of Munc13-2, Munc13-3, and Munc13-2-3 knock-out and wild-type mice, we report that the combined loss of Munc13-2 and Munc13-3 led to an increase in the rate of calcium-dependent recovery and a change in kinetics of release of the readily releasable pool. Furthermore, viral-mediated overexpression of a dominant-negative form of Munc13-1 at the calyx demonstrated that these effects are Munc13-1 dependent. Quantitative immunohistochemistry using Munc13–fluorescent protein knock-in mice revealed that Munc13-1 is the most highly expressed Munc13 isoform at the calyx and the only one highly colocalized with Bassoon at the active zone. Based on these data, we conclude that Munc13-2 and Munc13-3 isoforms limit the ability of Munc13-1 to regulate calcium-dependent replenishment of readily releasable pool and slow pool to fast pool conversion in central synapses.

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Crossref · 10.1523/jneurosci.5128-12.2013

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Authors
Chen, Z., Cooper, B., Kalla, S., Varoqueaux, F., & Young, S. M.
Affiliations
  • Max Planck Florida Institute for Neuroscience (US)
  • Max Planck Institute of Experimental Medicine (DE)
Venue
The Journal of Neuroscience
Published
2013-05-08
Volume
33
Issue
19
Pages
8336-8351
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2079607057
Cited by
102
References
55
Citations by year
2026: 5 · 2025: 4 · 2024: 4 · 2023: 7 · 2022: 10 · 2021: 7 · 2020: 8 · 2019: 9 · 2018: 12 · 2017: 11 · 2016: 5 · 2015: 10 · 2014: 7 · 2013: 3
FWCI
4.09
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • Max Planck Digital Library (submittedVersion)
  • IRIS (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
  • SERVAL (Université de Lausanne) (submittedVersion)
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 › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
Munc13, Munc13-1, readily releasable pool, calyx of Held, synaptic transmission, synaptic reliability, glutamatergic synapses, active zone, bassoon, knockout mice
MeSH terms
Age Factors, Analysis of Variance, Animals, Animals, Newborn, Brain Stem, Calcium, Electric Stimulation, Female, Male, Mice, Inbred C57BL, Nerve Tissue Proteins, Synaptic Transmission, Synapses, Mice, Knockout, Patch-Clamp Techniques, Gene Expression Regulation, Developmental, Excitatory Postsynaptic Potentials, Intracellular Signaling Peptides and Proteins, Green Fluorescent Proteins, Vesicular Glutamate Transport Protein 1, Mice, In Vitro Techniques

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