PreprintCited by 220Cannabis and Cannabinoid ResearchNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Activation of the cannabinoid receptor type 1 decreases glutamatergic and GABAergic synaptic transmission in the lateral amygdala of the mouse

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Azad, Shahnaz Christina, Eder, Matthias, Marsicano, Giovanni, Lutz, Beat, Zieglgänsberger, Walter, Rammes, Gerhard·2003·Learning & Memory

Abstract

The endogenous cannabinoid system has been shown recently to play a crucial role in the extinction of aversive memories. As the amygdala is presumably involved in this process, we investigated the effects of the cannabinoid receptor agonist WIN 55,212-2 (WIN-2) on synaptic transmission in the lateral amygdala (LA) of wild-type and cannabinoid receptor type 1 (CB1)-deficient mice. Extracellular field potential recordings and patch-clamp experiments were performed in an in vitro slice preparation. We found that WIN-2 reduces basal synaptic transmission and pharmacologically isolated AMPA receptor- and GABA(A) receptor-mediated postsynaptic currents in wild-type, but not in CB1-deficient mice. These results indicate that, in the LA, cannabinoids modulate both excitatory and inhibitory synaptic transmission via CB1. WIN-2-induced changes of paired-pulse ratio and of spontaneous and miniature postsynaptic currents suggest a presynaptic site of action. Inhibition of G(i/o) proteins and blockade of voltage-dependent and G protein-gated inwardly rectifying K(+) channels inhibited WIN-2 action on basal synaptic transmission. In contrast, modulation of the adenylyl cyclase-protein kinase A pathway, and blockade of presynaptic N- and P/Q- or of postsynaptic L- and R/T-type voltage-gated Ca(2+) channels did not affect WIN-2 effects. Our results indicate that the mechanisms underlying cannabinoid action in the LA partly resemble those observed in the nucleus accumbens and differ from those described for the hippocampus.

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  • Activation of CB1R in the BLA causes a decrease in both glutamatergic and GABAergic transmission, with typically a net reduction in neuronal excitability on application of CB1R agonists, probably due to presynaptic inhibition of glutamate release.

    “Although activation of CB1R in the BLA causes a decrease in both glutamatergic and GABAergic transmission, there is typically a net reduction in neuronal excitability on application of CB1R agonists, probably due to CB1R-mediated presynaptic inhibition of glutamate release [48,49].”

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Authors
Azad, S. C., Eder, M., Marsicano, G., Lutz, B., Zieglgänsberger, W., & Rammes, G.
Affiliations
LMU Klinikum (DE)
Venue
Learning & Memory
Published
2003-03-01
Volume
10
Issue
2
Pages
116-128
ISSN
  • 1072-0502 (ISSN-L)
  • 1549-5485
OpenAlex
W2134429437
Cited by
220
References
51
Citations by year
2026: 5 · 2025: 2 · 2024: 3 · 2023: 1 · 2022: 7 · 2021: 5 · 2020: 11 · 2019: 6 · 2018: 10 · 2017: 10 · 2016: 10 · 2015: 9 · 2014: 12 · 2013: 9 · 2012: 7
Type
posted content
Language
en
Open access
Locations
  • Learning & Memory (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • mediaTUM (Technical University of Munich) (submittedVersion)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
cannabinoid receptor type 1, WIN 55,212-2, lateral amygdala, synaptic transmission, AMPA receptors, GABAA receptor, presynaptic modulation, G protein signaling, inwardly rectifying potassium channels, voltage-gated calcium channels, endocannabinoid system
MeSH terms
Amygdala, Analgesics, Animals, Electrophysiology, gamma-Aminobutyric Acid, Male, Mice, Inbred C57BL, Mice, Transgenic, Morpholines, Naphthalenes, Neural Inhibition, Synaptic Transmission, Receptors, Drug, Receptors, GABA-A, Calcium Channels, Potassium Channels, Receptors, AMPA, Patch-Clamp Techniques, Glutamic Acid, Excitatory Postsynaptic Potentials, Receptors, Cannabinoid, Benzoxazines, Mice

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