Evidence map›Paper›PMID 17522015›Full record

ArticleLearning & memory (Cold Spring Harbor, N.Y.)2007

Histone modifications around individual BDNF gene promoters in prefrontal cortex are associated with extinction of conditioned fear.

Timothy W Bredy, Hao Wu, Cortney Crego, Jessica Zellhoefer, Yi E Sun, Mark Barad

Open access · diamondAbstract read
In one paragraph

Article in Learning & memory (Cold Spring Harbor, N.Y.), 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 280 papers.

0numbers the graph read from it
0cells of the map it votes in
280citing papers in PubMed
–field-weighted citation impact
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

280 citing papers in PubMed, 546 citations in OpenAlex.

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  17. DNA G-Quadruplex Is a Transcriptional Control Device That Regulates Memory.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2024
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220 more citing papers are in PubMed but not listed here.

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

6 authors at 1 institution in 1 country.

Timothy W BredyDepartment of Psychiatry and Biobehavioral Sciences, Brain Research Institute, Semel Institute for Neuroscience and Human Behavior, Los Angeles, California 90095, USA.
Hao Wu
Cortney Crego
Jessica Zellhoefer
Yi E Sun
Mark Barad
Neurobehavioral Systems · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Extinction of conditioned fear is an important model both of inhibitory learning and of behavior therapy for human anxiety disorders. Like other forms of learning, extinction learning is long-lasting and depends on regulated gene expression. Epigenetic mechanisms make an important contribution to persistent changes in gene expression; therefore, in these studies, we have investigated whether epigenetic regulation of gene expression contributes to fear extinction. Since brain-derived neurotrophic factor (BDNF) is crucial for synaptic plasticity and for the maintenance of long-term memory, we examined histone modifications around two BDNF gene promoters after extinction of cued fear, as potential targets of learning-induced epigenetic regulation of gene expression. Valproic acid (VPA), used for some time as an anticonvulsant and a mood stabilizer, modulates the expression of BDNF, and is a histone deacetylase (HDAC) inhibitor. Here, we report that extinction of conditioned fear is accompanied by a significant increase in histone H4 acetylation around the BDNF P4 gene promoter and increases in BDNF exon I and IV mRNA expression in prefrontal cortex, that VPA enhances long-term memory for extinction because of its HDAC inhibitor effects, and that VPA potentiates the effect of weak extinction training on histone H4 acetylation around both the BDNF P1 and P4 gene promoters and on BDNF exon IV mRNA expression. These results suggest a relationship between histone H4 modification, epigenetic regulation of BDNF gene expression, and long-term memory for extinction of conditioned fear. In addition, they suggest that HDAC inhibitors may become a useful pharmacological adjunct to psychotherapy for human anxiety disorders.

Indexed as

Conditioning, PsychologicalFearPromoter Regions, GeneticAcetylationAnimalsBrain-Derived Neurotrophic FactorEnzyme InhibitorsExtinction, PsychologicalHistone Deacetylase InhibitorsHistonesMaleMemoryMiceMice, Inbred C57BLPrefrontal CortexRNA, MessengerBrain-Derived Neurotrophic FactorEnzyme InhibitorsHistone Deacetylase InhibitorsHistonesRNA, MessengerValproic Acid

Identifiers

PMID17522015
PMCPMC2216532
OpenAlexW2137116499

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.