Evidence map›Paper›PMID 33723207›Full record

ArticleTranslational psychiatry2021

Fear extinction learning and anandamide: an fMRI study in healthy humans.

Jennifer Spohrs, Martin Ulrich, Georg Grön, Michael Prost, Paul Lukas Plener, Jörg Michael Fegert, Laura Bindila, Birgit Abler

Abstract read
In one paragraph

Article in Translational psychiatry, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed, 1 pooled it
–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

21 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Trial
  3. Article
  4. Article
  5. Understanding the Role of Endocannabinoids in Posttraumatic Stress Disorder.International journal of molecular sciences · 2025
    Review
  6. Article
  7. Biomarkers of stress resilience: A review.Neuroscience applied · 2024
    Article
  8. Article
  9. Genes · 2023
    Review
  10. Article
  11. Article
  12. Review
  13. Review
  14. Article
  15. Review
  16. FAAH polymorphism (rs324420) modulates extinction recall in healthy humans: an fMRI study.European archives of psychiatry and clinical neuroscience · 2022
    Article
  17. Acquisition of threat responses are associated with elevated plasma concentration of endocannabinoids in male humans.Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2022
    Article
  18. Article
  19. Review
  20. Article
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

8 authors.

Jennifer SpohrsClinic for Child and Adolescent Psychiatry/Psychotherapy, Ulm University, Ulm, Germany.ORCID http://orcid.org/0000-0001-8886-0395
Martin UlrichClinic for Psychiatry/Psychotherapy III, Ulm University, Ulm, Germany.
Georg GrönClinic for Psychiatry/Psychotherapy III, Ulm University, Ulm, Germany.ORCID http://orcid.org/0000-0002-0282-3575
Michael ProstClinic for Psychiatry/Psychotherapy III, Ulm University, Ulm, Germany.
Paul Lukas PlenerClinic for Child and Adolescent Psychiatry/Psychotherapy, Ulm University, Ulm, Germany.
Jörg Michael FegertClinic for Child and Adolescent Psychiatry/Psychotherapy, Ulm University, Ulm, Germany.
Laura BindilaDepartment of Physiological Chemistry-Lipidomics, Mainz University, Mainz, Germany.
Birgit AblerClinic for Psychiatry/Psychotherapy III, Ulm University, Ulm, Germany. birgit.abler@uni-ulm.de.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Anxiety- and trauma-related disorders are severe illnesses with high prevalence. Current treatment options leave room for improvement and the endocannabinoid system (ECS) has become a key target in psychopharmacological research. Rodent models suggest an anxiolytic effect of endocannabinoids and demonstrated that the ECS is involved in the modulation of fear learning and aversive memory consolidation. So far, one prominent target was inhibition of fatty acid amino hydrolase (FAAH), the degrading enzyme of the endocannabinoid anandamide (AEA). Research in humans remains scarce, but genetic studies have found that the single-nucleotide polymorphism (SNP) FAAH C385A (rs324420) is associated with lower catabolic performance of FAAH and increased levels of AEA. Translational research on the ECS in fear learning processes is rare, yet crucial to understand the mechanisms involved. To address this lack of research, we designed a fear conditioning, extinction learning paradigm with 51 healthy, male humans who underwent functional magnetic resonance imaging (fMRI) before analysing baseline and task-related changes of AEA, as well as the FAAH polymorphism (rs324420). The results indicate higher AEA levels in AC-heterozygotes than in CC-individuals (SNP rs324420), but no difference between the groups during extinction learning. However, neural activation of the anterior cingulate cortex and anterior insular cortex during extinction learning correlated positively with AEA baseline levels, and task-related changes in AEA were found particularly during fear extinction, with a modulatory effect on neural activation related to extinction learning. Results indicate a putative role for AEA in fear extinction learning. Pre-treatment with AEA-enhancing drugs could promote extinction learning during psychotherapeutic interventions.

Indexed as

EndocannabinoidsFearAmidohydrolasesArachidonic AcidsExtinction, PsychologicalHumansMagnetic Resonance ImagingMalePolyunsaturated AlkamidesAmidohydrolasesanandamideArachidonic AcidsEndocannabinoidsPolyunsaturated Alkamides

Identifiers

PMID33723207
PMCPMC7961038

What OpenQuestion holds

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LicenceCC BY
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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.