Evidence map›Paper›PMID 21903928›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2011

A small pool of vesicles maintains synaptic activity in vivo.

Annette Denker, Ioanna Bethani, Katharina Kröhnert, Christoph Körber, Heinz Horstmann, Benjamin G Wilhelm, Sina V Barysch, Thomas Kuner, Erwin Neher, Silvio O Rizzoli

Open access · bronzeAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 64 papers.

0numbers the graph read from it
0cells of the map it votes in
64citing papers in PubMed
5.7field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

64 citing papers in PubMed, 131 citations in OpenAlex.

  1. Article
  2. Presynaptic Vesicles Supply Membrane for Axonal Bouton Enlargement during Long Term Potentiation.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2026
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  11. Phospholipids Differentially Regulate CaACS chemical biology · 2024
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4 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

10 authors at 3 institutions in 1 country.

Annette DenkerEuropean Neuroscience Institute, Deutsche Forschungsgemeinschaft Center for Molecular Physiology of the Brain/Excellence Cluster 171, 37077 Göttingen, Germany.
Ioanna Bethani
Katharina Kröhnert
Christoph Körber
Heinz Horstmann
Benjamin G Wilhelm
Sina V Barysch
Thomas Kuner
Erwin Neher
Silvio O Rizzoli
Deutsche Forschungsgemeinschaft · DEHeidelberg University · DEMax Planck Institute for Biophysical Chemistry · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Chemical synapses contain substantial numbers of neurotransmitter-filled synaptic vesicles, ranging from approximately 100 to many thousands. The vesicles fuse with the plasma membrane to release neurotransmitter and are subsequently reformed and recycled. Stimulation of synapses in vitro generally causes the majority of the synaptic vesicles to release neurotransmitter, leading to the assumption that synapses contain numerous vesicles to sustain transmission during high activity. We tested this assumption by an approach we termed cellular ethology, monitoring vesicle function in behaving animals (10 animal models, nematodes to mammals). Using FM dye photooxidation, pHluorin imaging, and HRP uptake we found that only approximately 1-5% of the vesicles recycled over several hours, in both CNS synapses and neuromuscular junctions. These vesicles recycle repeatedly, intermixing slowly (over hours) with the reserve vesicles. The latter can eventually release when recycling is inhibited in vivo but do not seem to participate under normal activity. Vesicle recycling increased only to ≈ 5% in animals subjected to an extreme stress situation (frog predation on locusts). Synapsin, a molecule binding both vesicles and the cytoskeleton, may be a marker for the reserve vesicles: the proportion of vesicles recycling in vivo increased to 30% in synapsin-null Drosophila. We conclude that synapses do not require numerous reserve vesicles to sustain neurotransmitter release and thus may use them for other purposes, examined in the accompanying paper.

Indexed as

AnimalsAnimals, Genetically ModifiedCaenorhabditis elegansChick EmbryoDrosophila melanogasterFemaleGene Knockout TechniquesGenes, InsectGrasshoppersHydrogen-Ion ConcentrationMaleMiceMicroscopy, Electron, TransmissionModels, NeurologicalMutationNeurotransmitter AgentsNeurotransmitter AgentsSynapsins

Identifiers

PMID21903928
PMCPMC3193224
OpenAlexW2079324871

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.