Cited by 264Cannabis and Cannabinoid ResearchMemory and Neural MechanismsNeuroscience and Neuropharmacology Research

Circuitry for associative plasticity in the amygdala involves endocannabinoid signaling

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Azad, Shahnaz C., Monory, Krisztina, Marsicano, Giovanni, Cravatt, Benjamin F., Lutz, Beat, Zieglgänsberger, Walter, Rammes, Gerhard·2004·The Journal of Neuroscience

Abstract

Endocannabinoids are crucial for the extinction of aversive memories, a process that considerably involves the amygdala. Here, we show that low-frequency stimulation of afferents in the lateral amygdala with 100 pulses at 1 Hz releases endocannabinoids postsynaptically from neurons of the basolateral amygdala of mice in vitro and thereby induces a long-term depression of inhibitory GABAergic synaptic transmission (LTDi) via a presynaptic mechanism. Lowering inhibitory synaptic transmission significantly increases the amplitude of excitatory synaptic currents in principal neurons of the central nucleus, which is the main output site of the amygdala. LTDi involves a selective mGluR1 (metabotropic glutamate receptor 1)-mediated calcium-independent mechanism and the activation of the adenylyl cyclase-protein kinase A pathway. LTDi is abolished by the cannabinoid type 1 (CB1) receptor antagonist SR141716A and cannot be evoked in CB1 receptor-deficient animals. LTDi is significantly enhanced in mice lacking the anandamide-degrading enzyme fatty acid amide hydrolase. The present findings show for the first time that mGluR activation induces a retrograde endocannabinoid signaling via activation of the adenylyl cyclase-protein kinase A pathway and the release of anandamide. Furthermore, the results indicate that anandamide decreases the activity of inhibitory interneurons in the amygdala. This disinhibition increases the activity of common output neurons and could provide a prerequisite for extinction by formation of new memory.

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Crossref · 10.1523/jneurosci.2134-04.2004

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  • Inhibition of FAAH facilitates long-term fear extinction and rescues deficient fear extinction in rodent models by enhancing AEA-CB1 receptor signaling and synaptic plasticity in the BLA.

    “Additionally, inhibition of FAAH facilitates long-term fear extinction and rescues deficient fear extinction in rodent models by enhancing AEA–CB1 (cannabinoid type 1) receptor signaling and synaptic plasticity in the BLA.”
  • CB1R signaling generated by increased AEA can produce long-term depression of inhibitory transmission in the BLA, a change in synaptic plasticity which can serve to promote excitability.

    “By contrast, CB1R signaling generated by increased AEA can also produce long-term depression of inhibitory transmission in the BLA, a change in synaptic plasticity which can serve to promote excitability [50,51].”
  • A CB1R-dependent form of synaptic plasticity in the BLA, long-term depression of inhibitory GABAergic transmission (LTDi), is enhanced by FAAH knockout and by the FAAH inhibitor AM3506 at doses that promote extinction.

    “One notable finding is that a CB1R-dependent form of synaptic plasticity in BLA [51,86], long-term depression of inhibitory GABAergic transmission (LTDi), is enhanced by FAAH KO [51] and by the FAAH inhibitor AM3506 at doses that promote extinction [50].”
  • AEA released during extinction relieves a tonic inhibitory brake on BLA output neurons necessary for the encoding of extinction memories.

    “This suggests a scheme in which AEA released during extinction relieves a tonic inhibitory brake on BLA output neurons [50,51,86] necessary for the encoding of extinction memories [102] (Figure 2).”

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Authors
Azad, S. C., Monory, K., Marsicano, G., Cravatt, B. F., Lutz, B., Zieglgänsberger, W., & Rammes, G.
Affiliations
  • Max Planck Institute of Psychiatry (DE)
  • Scripps Research Institute (US)
  • TUM Klinikum (DE)
Corresponding author
Azad, Shahnaz C.
Venue
The Journal of Neuroscience
Published
2004-11-03
Volume
24
Issue
44
Pages
9953-9961
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2158593571
Cited by
263
References
71
Citations by year
2026: 1 · 2025: 3 · 2024: 5 · 2023: 5 · 2022: 11 · 2021: 11 · 2020: 11 · 2019: 8 · 2018: 8 · 2017: 9 · 2016: 12 · 2015: 15 · 2014: 17 · 2013: 13 · 2012: 15
FWCI
10.45
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • mediaTUM (Technical University of Munich) (submittedVersion)
Funders
Deutsche Forschungsgemeinschaft (SFB 391)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
endocannabinoid signaling, amygdala, associative plasticity, fear extinction, anandamide, CB1 receptor, mGluR1, long-term depression, synaptic inhibition, fatty acid amide hydrolase, basolateral amygdala, central amygdala, inhibitory interneurons, disinhibition, aversive memory
MeSH terms
Fatty Acid Amide Hydrolases, Adenylyl Cyclases, Amidohydrolases, Amygdala, Animals, Calcium, gamma-Aminobutyric Acid, Lipoprotein Lipase, Male, Mice, Inbred C57BL, Nerve Tissue Proteins, Neural Inhibition, Neuronal Plasticity, Type C Phospholipases, Synapses, Cyclic AMP-Dependent Protein Kinases, Receptors, Metabotropic Glutamate, Mice, Knockout, GTP-Binding Proteins, Receptor, Cannabinoid, CB1, Mice, Cannabinoid Receptor Modulators, Endocannabinoids, In Vitro Techniques

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