Cited by 83Cannabis and Cannabinoid ResearchMemory and Neural MechanismsPain Mechanisms and Treatments

The effect of CB1 receptor antagonism in the right basolateral amygdala on conditioned fear and associated analgesia in rats

Roche, Michelle, O'Connor, Emer, Diskin, Catherine, Finn, David P.·2007·European Journal of Neuroscience

Abstract

The endocannabinoid system mediates analgesia expressed following exposure to conditioned or unconditioned aversive stimuli, and controls the extinction of conditioned aversive behaviour. The present study investigated the effects of administration of the cannabinoid(1) (CB(1)) receptor antagonist SR141716A into the right basolateral amygdala (BLA) on expression of conditioned fear, formalin-evoked nociceptive behaviour, fear-conditioned analgesia and associated alterations in monoamine levels in discrete rat brain areas. Re-exposure to a context previously paired with footshock significantly reduced formalin-evoked nociceptive behaviour. Intra-BLA administration of SR141716A did not attenuate fear-conditioned analgesia, but reduced formalin-evoked nociceptive behaviour and attenuated the formalin-induced decrease in freezing and 22-kHz ultrasonic vocalizations in the early part of the trial. Furthermore, intra-BLA SR141716A significantly prolonged the duration of these fear-related behaviours in fear-conditioned rats not receiving formalin. Fear-conditioned analgesia was accompanied by increased homovanillic acid (HVA) : dopamine (DA) ratio and reduced serotonin (5-HT) in the cerebellum, an effect not altered by SR141716A. SR141716A-induced analgesia was accompanied by reduced DA, increased HVA : DA ratio and reduced 5-HT levels in the cerebellum, increased hippocampal HVA levels and increased 5-hydroxyindole-3-acetic acid (5-HIAA) in the amygdaloid cortex. The SR141716A-induced prolongation of contextually induced aversive behaviour was accompanied by reduced DA and 3,4-dihydroxyphenylacetic acid (DOPAC), levels in the hippocampus, and increased DA and 5-HIAA in the periaqueductal grey. These data suggest an important role for CB(1) receptors in the right BLA in mediating short-term extinction of conditioned aversive behaviour but not fear-conditioned analgesia. The results also enhance our understanding of endocannabinoid-monoamine interactions of relevance to conditioned fear and associated analgesia.

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Crossref · 10.1111/j.1460-9568.2007.05861.x

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  • Infusing SR141716A directly into the BLA or mPFC is sufficient to impair cued fear extinction in rats.

    “Subsequent studies showed that infusing SR141716A directly into the BLA (or mPFC [90]) was sufficient to impair a cued fear extinction in rats [91,92].”

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Authors
Roche, M., O'Connor, E., Diskin, C., & Finn, D. P.
Affiliations
Ollscoil na Gaillimhe – University of Galway (IE)
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
2007-10-26
Volume
26
Issue
9
Pages
2643-2653
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W1500759439
Cited by
83
References
76
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 1 · 2022: 4 · 2021: 1 · 2020: 6 · 2019: 3 · 2018: 2 · 2017: 7 · 2016: 4 · 2015: 3 · 2014: 4 · 2013: 6 · 2012: 10
FWCI
3.10
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National University of Ireland
  • Health Research Board
  • Science Foundation Ireland
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
Keywords
CB1 receptor antagonism, SR141716A, basolateral amygdala, fear conditioning, formalin-induced nociception, fear extinction, endocannabinoid system, monoamines, dopamine, serotonin, homovanillic acid, 5-hydroxyindoleacetic acid, hippocampus, periaqueductal gray
MeSH terms
Rimonabant, Amygdala, Analgesia, Analgesics, Animals, Cerebellum, Conditioning, Psychological, Dopamine, Electric Stimulation, Fear, Functional Laterality, Male, Synaptic Transmission, Pain, Pain Measurement, Periaqueductal Gray, Piperidines, Pyrazoles, Serotonin, Vocalization, Animal, Receptor, Cannabinoid, CB1, Rats, Cannabinoid Receptor Modulators

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