Cited by 491Cannabis and Cannabinoid ResearchPain Mechanisms and TreatmentsIon Channels and Receptors

Activation of CB 2 cannabinoid receptors by AM1241 inhibits experimental neuropathic pain: Pain inhibition by receptors not present in the CNS

Open access
Ibrahim, Mohab M., Deng, Hongfeng, Zvonok, Alexander, Cockayne, Debra A., Kwan, Joyce, Mata, Heriberto P., Vanderah, Todd W., Lai, Josephine +3 more·2003·Proceedings of the National Academy of Sciences

Abstract

We designed AM1241, a selective CB2 cannabinoid receptor agonist, and used it to test the hypothesis that CB2 receptor activation would reverse the sensory hypersensitivity observed in neuropathic pain states. AM1241 exhibits high affinity and selectivity for CB2 receptors. It also exhibits high potency in vivo. AM1241 dose-dependently reversed tactile and thermal hypersensitivity produced by ligation of the L5 and L6 spinal nerves in rats. These effects were selectively antagonized by a CB2 but not by a CB1 receptor antagonist, suggesting that they were produced by actions of AM1241 at CB2 receptors. AM1241 was also active in blocking spinal nerve ligation-induced tactile and thermal hypersensitivity in mice lacking CB1 receptors (CB1-/- mice), confirming that AM1241 reverses sensory hypersensitivity independent of actions at CB1 receptors. These findings demonstrate a mechanism leading to the inhibition of pain, one that targets receptors localized exclusively outside the CNS. Further, they suggest the potential use of CB2 receptor-selective agonists for treatment of human neuropathic pain, a condition currently without consistently effective therapies. CB2 receptor-selective agonist medications are predicted to be without the CNS side effects that limit the effectiveness of currently available medications.

Integrity signals

Registry

Crossref · 10.1073/pnas.1834309100

Cites

37 of 37 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Ibrahim, M. M., Deng, H., Zvonok, A., Cockayne, D. A., Kwan, J., Mata, H. P., Vanderah, T. W., Lai, J., Porreca, F., Makriyannis, A., & Malan, T. P.
Affiliations
  • University of Arizona (US)
  • F. Hoffmann-La Roche AG (CH)
Venue
Proceedings of the National Academy of Sciences
Published
2003-08-13
Volume
100
Issue
18
Pages
10529-10533
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1964037009
Cited by
491
References
37
Citations by year
2026: 7 · 2025: 12 · 2024: 6 · 2023: 12 · 2022: 9 · 2021: 14 · 2020: 18 · 2019: 13 · 2018: 12 · 2017: 19 · 2016: 12 · 2015: 19 · 2014: 17 · 2013: 31 · 2012: 24
FWCI
23.15
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Arizona
  • National Institutes of Health (5k01da000283-04)
  • National Institute on Drug Abuse (DA3801, DA 00283, DA 9158, R01DA007215, R01DA003801, DA7215, R37DA003801, P01DA009158)
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, AM1241, neuropathic pain, sensory hypersensitivity, spinal nerve ligation, CB1 receptor, peripheral cannabinoid receptors, pain inhibition
MeSH terms
Analgesics, Animals, Brain, Cannabinoids, Dose-Response Relationship, Drug, Male, Mice, Inbred C57BL, Pain, Receptors, Drug, Rats, Sprague-Dawley, Receptors, Cannabinoid, Receptor, Cannabinoid, CB2, Mice, Rats

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review