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Dual action of the cannabinoid receptor 1 ligand arachidonyl-2'-chloroethylamide on calcitonin gene-related peptide release

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  1. Expression of vasopressin and its receptors in migraine-related regions in CNS and the trigeminal system: influence of sex

    Research output: Contribution to journalJournal articleResearchpeer-review

  2. Cardiac cephalalgia: a narrative review and ICHD-3 criteria evaluation

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  3. Debate: Are cluster headache and migraine distinct headache disorders?

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  4. Microvascular decompression in trigeminal neuralgia - a prospective study of 115 patients

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  1. Expression of vasopressin and its receptors in migraine-related regions in CNS and the trigeminal system: influence of sex

    Research output: Contribution to journalJournal articleResearchpeer-review

  2. Myocardial perfusion recovery induced by an α-calcitonin gene-related peptide analogue

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  3. Could Experimental Inflammation Provide Better Understanding of Migraines?

    Research output: Contribution to journalReviewpeer-review

  4. Identifying molecular targets in trigeminal nociception

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BACKGROUND: Based on the current understanding of the role of neuropeptide signalling in migraine, we explored the therapeutic potential of a specific cannabinoid agonist. The aim of the present study was to examine the effect of the synthetic endocannabinoid (eCB) analogue, arachidonyl-2'-chloroethylamide (ACEA), on calcitonin gene-related peptide (CGRP) release in the dura and trigeminal ganglion (TG), as cannabinoids are known to activate Gi/o-coupled cannabinoid receptors type 1 (CB1), resulting in neuronal inhibition.

METHODS: The experiments were performed using the hemi-skull model and dissected TGs from male Sprague-Dawley rats. CGRP release was induced by either 60 mM K+ (for depolarization-induced stimulation) or 100 nM capsaicin (for transient receptor potential vanilloid 1 (TRPV1) -induced stimulation) and measured using an enzyme-linked immunosorbent assay. The analysis of CGRP release data was combined with immunohistochemistry in order to study the cellular localization of CB1, cannabinoid receptor type 2 (CB2), CGRP and receptor activity modifying protein 1 (RAMP1), a subunit of the functional CGRP receptor, in the TG.

RESULTS: CB1 was predominantly expressed in neuronal somas in which colocalization with CGRP was observed. Furthermore, CB1 exhibited colocalization with RAMP1 in neuronal Aδ-fibres but was not clearly expressed in the CGRP-immunoreactive C-fibres. CB2 was mainly expressed in satellite glial cells and did not show substantial colocalization with either CGRP or RAMP1. Without stimulation, 140 nM ACEA per se caused a significant increase in CGRP release in the dura but not TG, compared to vehicle. Furthermore, 140 nM ACEA did not significantly modify neither K+- nor capsaicin-induced CGRP release. However, when the TRPV1 blocker AMG9810 (1 mM) was coapplied with ACEA, K+-induced CGRP release was significantly attenuated in the TG and dura.

CONCLUSIONS: Results from the present study indicate that ACEA per se does not exhibit antimigraine potential due to its dual agonistic properties, resulting in activation of both CB1 and TRPV1, and thereby inhibition and stimulation of CGRP release, respectively.

Original languageEnglish
Article number30
JournalThe Journal of Headache and Pain Online
Volume23
Issue number1
Pages (from-to)30
Number of pages11
ISSN1129-2377
DOIs
Publication statusPublished - 21 Feb 2022

Bibliographical note

© 2022. The Author(s).

    Research areas

  • Animals, Arachidonic Acids, Calcitonin Gene-Related Peptide/metabolism, Ligands, Male, Rats, Rats, Sprague-Dawley, Receptors, Cannabinoid, ACEA, Immunohistochemistry, Trigeminal ganglion, CGRP, Cannabinoid receptors

ID: 75489295