Cited by 81Cannabis and Cannabinoid ResearchMemory and Neural MechanismsNeuroscience and Neuropharmacology Research

Integrated cannabinoid CB1 receptor transmission within the amygdala–prefrontal cortical pathway modulates neuronal plasticity and emotional memory encoding

Tan, H., Lauzon, N. M., Bishop, S. F., Bechard, M. A., Laviolette, S. R.·2010·Cerebral Cortex

Abstract

The cannabinoid CB1 receptor system is functionally involved in the processing and encoding of emotionally salient sensory information, learning and memory. The CB1 receptor is found in high concentrations in brain structures that are critical for emotional processing, including the basolateral amygdala (BLA) and the medial prefrontal cortex (mPFC). In addition, synaptic plasticity in the form of long-term potentiation (LTP) within the BLA > mPFC pathway is an established correlate of exposure to emotionally salient events. We performed a series of in vivo LTP studies by applying tetanic stimulation to the BLA combined with recordings of local field potentials within prelimbic cortical (PLC) region of the rat mPFC. Systemic pretreatment with AM-251 dose dependently blocked LTP along the BLA-PLC pathway and also the behavioral acquisition of conditioned fear memories. We next performed a series of microinfusion experiments wherein CB1 receptor transmission within the BLA > PLC circuit was pharmacologically blocked. Asymmetrical, interhemispheric blockade of CB1 receptor transmission along the BLA > PLC pathway prevented the acquisition of emotionally salient associative memory. Our results indicate that coordinated CB1 receptor transmission within the BLA > PLC pathway is critically involved in the encoding of emotional fear memories and modulates neural plasticity related to the encoding of emotionally salient associative learning.

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Crossref · 10.1093/cercor/bhp210

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  • Responses to fear cues in mPFC neurons receiving inputs from BLA were potentiated by the CB1R agonist WIN55212-2, and CB1R blockade/inverse agonism with AM251 in these regions disrupts fear learning and learning-related long-term potentiation.

    “Responses to fear cues in mPFC neurons receiving inputs from BLA were potentiated by the CB1R agonist WIN55212-2, and CB1R blockade/inverse agonism (with AM251) in these regions disrupts fear learning and learning-related synaptic plasticity (long-term potentiation) [83–85].”
  • The effects of ECBs on fear are not restricted to the BLA but involve a pathway between the BLA and mPFC.

    “These effects on fear are not restricted to the BLA but involve a pathway between the BLA and mPFC.”

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Authors
Tan, H., Lauzon, N. M., Bishop, S. F., Bechard, M. A., & Laviolette, S. R.
Affiliations
Western University (CA)
Venue
Cerebral Cortex
Published
2009-10-30
Volume
20
Issue
6
Pages
1486-1496
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2137721816
Cited by
81
References
44
Citations by year
2026: 1 · 2025: 1 · 2024: 4 · 2023: 2 · 2022: 4 · 2021: 5 · 2020: 6 · 2019: 2 · 2018: 2 · 2017: 7 · 2016: 6 · 2015: 5 · 2014: 10 · 2013: 9 · 2012: 6
FWCI
4.07
Type
journal article
Language
en
Open access
closed
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
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
CB1 receptor, amygdala, medial prefrontal cortex, basolateral amygdala, prelimbic cortex, long-term potentiation, synaptic plasticity, emotional memory, fear memory, fear conditioning, AM251, cannabinoid signaling, associative learning
MeSH terms
Amygdala, Animals, Brain Mapping, Electric Stimulation, Emotions, Male, Memory, Neural Pathways, Synaptic Transmission, Neuronal Plasticity, Piperidines, Pyrazoles, Rats, Sprague-Dawley, Prefrontal Cortex, Long-Term Potentiation, Receptor, Cannabinoid, CB1, Rats

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