Evidence map›Paper›PMID 19487674›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2009

ERK activation in axonal varicosities modulates presynaptic plasticity in the CA3 region of the hippocampus through synapsin I.

Hugo Vara, Franco Onofri, Fabio Benfenati, Marco Sassoè-Pognetto, Maurizio Giustetto

Open access · greenAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers.

0numbers the graph read from it
0cells of the map it votes in
38citing papers in PubMed
1.8field-weighted citation impact, top 17% 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

38 citing papers in PubMed, 58 citations in OpenAlex.

  1. The tyrosine phosphatase STEP is a developmental suppressor of synaptogenesis.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  2. Canonical Cannabinoid Receptors.Current topics in behavioral neurosciences · 2026
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  13. Frontiers in cellular neuroscience · 2020
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 3 institutions in 1 country.

Hugo VaraDepartment of Anatomy, Pharmacology, and Forensic Medicine, University of Turin, C.so Massimo d'Azeglio, 52, I-10126 Turin, Italy.
Franco Onofri
Fabio Benfenati
Marco Sassoè-Pognetto
Maurizio Giustetto
Neuroscience Institute · ITUniversity of Turin · ITItalian Institute of Technology · IT

Funding

Telethon GGP05134
6 · The paper itself

Abstract

Activity-dependent changes in the strength of synaptic connections in the hippocampus are central for cognitive processes such as learning and memory storage. In this study, we reveal an activity-dependent presynaptic mechanism that is related to the modulation of synaptic plasticity. In acute mouse hippocampal slices, high-frequency stimulation (HFS) of the mossy fiber (MF)-CA3 pathway induced a strong and transient activation of extracellular-regulated kinase (ERK) in MF giant presynaptic terminals. Remarkably, pharmacological blockade of ERK disclosed a negative role of this kinase in the regulation of a presynaptic form of plasticity at MF-CA3 contacts. This ERK-mediated inhibition of post-tetanic enhancement (PTE) of MF-CA3 synapses was both frequency- and pathway-specific and was observed only with HFS at 50 Hz. Importantly, blockade of ERK was virtually ineffective on PTE of MF-CA3 synapses in mice lacking synapsin I, 1 of the major presynaptic ERK substrates, and triple knockout mice lacking all synapsin isoforms displayed PTE kinetics resembling that of wild-type mice under ERK inhibition. These findings reveal a form of short-term synaptic plasticity that depends on ERK and is finely tuned by the firing frequency of presynaptic neurons. Our results also demonstrate that presynaptic activation of the ERK signaling pathway plays part in the activity-dependent modulation of synaptic vesicle mobilization and transmitter release.

Indexed as

AxonsNeuronal PlasticityAnimalsEnzyme ActivationExtracellular Signal-Regulated MAP KinasesHippocampusImmunohistochemistryIn Vitro TechniquesMiceMice, Inbred C57BLMice, KnockoutMicroscopy, ConfocalSynapsesSynapsinsExtracellular Signal-Regulated MAP KinasesSynapsins

Identifiers

PMID19487674
PMCPMC2701005
OpenAlexW2034697967

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.