CB2 cannabinoid receptor-mediated peripheral antinociception
Abstract
Cannabinoid receptor agonists diminish responses to painful stimuli. Extensive evidence implicates the CB(1) receptor in the production of antinociception. However, the capacity of CB(2) receptors, which are located outside the central nervous system (CNS), to produce antinociception is not known. Using AM1241, a CB(2) receptor-selective agonist, we demonstrate that CB(2) receptors produce antinociception to thermal stimuli. Injection of AM1241 in the hindpaw produced antinociception to a stimulus applied to the same paw. Injection of an equivalent dose of AM1241 into the paw contralateral to the side of testing did not. The antinociceptive actions of AM1241 were blocked by the CB(2) receptor-selective antagonist AM630, but not by the CB(1) receptor-selective antagonist AM251. AM1241 also produced antinociception when injected systemically (intraperitoneally). The antinociceptive actions of systemic AM1241 were blocked by injection of AM630 into the paw where the thermal stimulus was applied, but not the contralateral paw. These findings demonstrate the local, peripheral nature of CB(2) cannabinoid antinociception. AM1241 did not produce the CNS cannabinoid effects of hypothermia, catalepsy, inhibition of activity or impaired ambulation, while this tetrad of effects was produced by the mixed CB(1)/CB(2) receptor agonist WIN55,212-2. Peripheral antinociception without CNS effects is consistent with the peripheral distribution of CB(2) receptors. CB(2) receptor agonists may have promise clinically for the treatment of pain without CNS cannabinoid side effects.
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Activation of the CB1 receptor results in hypothermia, sedation, catalepsy, and altered mental status.
“Activation of the CB1 receptor also results in hypothermia, sedation, catalepsy, and altered mental status.11”
From Cannabinoids as Pharmacotherapies for Neuropathic Pain: From the Bench to the Bedside (2009) · cites this paper as [11]
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- Authors
- Malan, P. T., Ibrahim, M. M., Deng, H., Liu, Q., Mata, H. P., Vanderah, T., Porreca, F., & Makriyannis, A.
- Affiliations
- University of Arizona (US)
- University of Connecticut (US)
- Corresponding author
- Malan, Philip T.
- Venue
- Pain
- Published
- 2001-09
- Volume
- 93
- Issue
- 3
- Pages
- 239-245
- ISSN
- 0304-3959 (ISSN-L)
- OpenAlex
- W2070535004
- Cited by
- 391
- References
- 38
- Citations by year
- 2026: 5 · 2025: 2 · 2024: 5 · 2023: 8 · 2022: 7 · 2021: 13 · 2020: 10 · 2019: 9 · 2018: 8 · 2017: 9 · 2016: 14 · 2015: 8 · 2014: 12 · 2013: 23 · 2012: 9
- FWCI
- 8.68
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Pain (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (5k01da000283-04)
- National Institute on Drug Abuse (DA 11823, DA 00283, R01DA011823)
- Topics
- Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
- Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
- Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
- Keywords
- CB2 receptor, peripheral antinociception, AM1241, AM630, thermal pain, CB1 receptor, WIN 55,212-2, cannabinoid receptor agonists, pain management
- MeSH terms
- Analgesics, Animals, Cannabinoids, Indoles, Male, Morpholines, Naphthalenes, Pain Measurement, Piperidines, Pyrazoles, Receptors, Drug, Rats, Sprague-Dawley, Peripheral Nervous System, Receptors, Cannabinoid, Receptor, Cannabinoid, CB2, Benzoxazines, Rats
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