Cited by 1,039Cannabis and Cannabinoid ResearchReceptor Mechanisms and SignalingNeuroscience and Neuropharmacology Research

Cannabidiol is a negative allosteric modulator of the cannabinoid CB 1 receptor

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Laprairie, R B, Bagher, A M, Kelly, M E M, Denovan‐Wright, E M·2015·British Journal of Pharmacology

Abstract

Background and Purpose: Cannabidiol has been reported to act as an antagonist at cannabinoid CB 1 receptors. We hypothesized that cannabidiol would inhibit cannabinoid agonist activity through negative allosteric modulation of CB 1 receptors. Experimental Approach: Internalization of CB 1 receptors, arrestin2 recruitment, and PLCβ3 and ERK1/2 phosphorylation, were quantified in HEK 293A cells heterologously expressing CB 1 receptors and in the ST Hdh Q7/Q7 cell model of striatal neurons endogenously expressing CB 1 receptors. Cells were treated with 2‐arachidonylglycerol or Δ 9 ‐tetrahydrocannabinol alone and in combination with different concentrations of cannabidiol. Key Results: Cannabidiol reduced the efficacy and potency of 2‐arachidonylglycerol and Δ 9 ‐tetrahydrocannabinol on PLCβ3‐ and ERK1/2‐dependent signalling in cells heterologously (HEK 293A) or endogenously (ST Hdh Q7/Q7 ) expressing CB 1 receptors. By reducing arrestin2 recruitment to CB 1 receptors, cannabidiol treatment prevented internalization of these receptors. The allosteric activity of cannabidiol depended upon polar residues being present at positions 98 and 107 in the extracellular amino terminus of the CB 1 receptor. Conclusions and Implications: Cannabidiol behaved as a non‐competitive negative allosteric modulator of CB 1 receptors. Allosteric modulation, in conjunction with effects not mediated by CB 1 receptors, may explain the in vivo effects of cannabidiol. Allosteric modulators of CB 1 receptors have the potential to treat CNS and peripheral disorders while avoiding the adverse effects associated with orthosteric agonism or antagonism of these receptors.

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  1. Hudson BD, Hébert TE, Kelly ME (2010). Physical and functional interaction between CB1 cannabinoid receptors and beta2‐adrenoceptors. Br J Pharmacol 160: 627–642. [DOI] [PMC free article] [PubMed] [Google Scholar]

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Authors
Laprairie, R. B., Bagher, A. M., Kelly, M. E. M., & Denovan‐Wright, E. M.
Affiliations
Dalhousie University (CA)
Corresponding author
Denovan‐Wright, E M
Venue
British Journal of Pharmacology
Publisher
Wiley
Published
2015-10
Volume
172
Issue
20
Pages
4790-4805
ISSN
  • 0007-1188 (ISSN-L)
  • 1476-5381
OpenAlex
W1945751328
Cited by
1,039
References
47
Citations by year
2026: 92 · 2025: 107 · 2024: 107 · 2023: 107 · 2022: 133 · 2021: 150 · 2020: 125 · 2019: 89 · 2018: 54 · 2017: 49 · 2016: 19 · 2015: 6
FWCI
30.74
Type
journal article
Language
en
Open access
Locations
  • British Journal of Pharmacology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Canadian Institutes of Health Research (ROP-97185, MOP-97768)
  • Killam Trusts
  • Nova Scotia Health Research Foundation
  • King Abdulaziz University of Saudi Arabia
  • Huntington Society of Canada
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
cannabidiol, CB1 receptor, negative allosteric modulation, receptor internalization, ERK1/2 phosphorylation, 2-arachidonoylglycerol, delta-9-tetrahydrocannabinol, allosteric modulators, non-competitive antagonism
MeSH terms
Animals, Cannabidiol, Cell Line, Humans, Arrestins, MAP Kinase Signaling System, Receptor, Cannabinoid, CB1, Mice, Phospholipase C beta, HEK293 Cells, Cannabinoid Receptor Modulators

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