Cited by 173Cannabis and Cannabinoid ResearchPain Mechanisms and TreatmentsPain Management and Treatment

Inhibition of fatty acid amide hydrolase produces analgesia by multiple mechanisms

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Chang, Leon, Luo, Lin, Palmer, James A, Sutton, Steven, Wilson, Sandy J, Barbier, Ann J, Breitenbucher, James Guy, Chaplan, Sandra R +1 more·2006·British Journal of Pharmacology

Abstract

The reversible fatty acid amide hydrolase (FAAH) inhibitor OL135 reverses mechanical allodynia in the spinal nerve ligation (SNL) and mild thermal injury (MTI) models in the rat. The purpose of this study was to investigate the role of the cannabinoid and opioid systems in mediating this analgesic effect. Elevated brain concentrations of anandamide (350 pmol g−1 of tissue vs 60 pmol g−1 in vehicle‐treated controls) were found in brains of rats given OL135 (20 mg kg−1) i.p. 15 min prior to 20 mg kg−1 i.p. anandamide. Predosing rats with OL135 (2–60 mg kg−1 i.p.) 30 min before administration of an irreversible FAAH inhibitor (URB597: 0.3 mg kg−1 intracardiac) was found to protect brain FAAH from irreversible inactivation. The level of enzyme protection was correlated with the OL135 concentrations in the same brains. OL135 (100 mg kg−1 i.p.) reduced by 50% of the maximum possible efficacy (MPE) mechanical allodynia induced by MTI in FAAH+/+mice (von Frey filament measurement) 30 min after dosing, but was without effect in FAAH−/− mice. OL135 given i.p. resulted in a dose‐responsive reversal of mechanical allodynia in both MTI and SNL models in the rat with an ED50 between 6 and 9 mg kg−1. The plasma concentration at the ED50 in both models was 0.7 μM (240 ng ml−1). In the rat SNL model, coadministration of the selective CB2 receptor antagonist SR144528 (5 mg kg−1 i.p.), with 20 mg kg−1 OL135 blocked the OL135‐induced reversal of mechanical allodynia, but the selective CB1 antagonist SR141716A (5 mg kg−1 i.p.) was without effect. In the rat MTI model neither SR141716A or SR144528 (both at 5 mg kg−1 i.p.), or a combination of both antagonists coadministered with OL135 (20 mg kg−1) blocked reversal of mechanical allodynia assessed 30 min after dosing. In both the MTI model and SNL models in rats, naloxone (1 mg kg−1, i.p. 30 min after OL135) reversed the analgesia (to 15% of control levels in the MTI model, to zero in the SNL) produced by OL135. British Journal of Pharmacology (2006) 148, 102–113. doi: 10.1038/sj.bjp.0706699

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  1. 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 Jr, T.P. (2003). Activation of CB2 cannabinoid receptors by AM1241 inhibits experimental neuro- pathic pain: pain inhibition by receptors not present in the CNS. Proc. Natl. Acad. Sci. U.S.A., 100, 10529-10533.

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Authors
Chang, L., Luo, L., Palmer, J. A., Sutton, S., Wilson, S. J., Barbier, A. J., Breitenbucher, J. G., Chaplan, S. R., & Webb, M.
Affiliations
Janssen Research & Development (United States) (US)
Corresponding author
Webb, Michael
Venue
British Journal of Pharmacology
Publisher
Wiley
Published
2006-05
Volume
148
Issue
1
Pages
102-113
ISSN
  • 0007-1188 (ISSN-L)
  • 1476-5381
OpenAlex
W2614602784
Cited by
155
References
63
Citations by year
2026: 2 · 2025: 2 · 2024: 4 · 2023: 5 · 2022: 3 · 2021: 3 · 2020: 2 · 2019: 3 · 2018: 2 · 2017: 5 · 2016: 10 · 2015: 8 · 2014: 6 · 2013: 11 · 2012: 13
FWCI
12.54
Type
journal article
Language
en
Open access
Locations
British Journal of Pharmacology (publishedVersion)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
  • Health Sciences › Medicine › Anesthesiology and Pain Medicine › Pain Management and Treatment
Keywords
fatty acid amide hydrolase inhibition, anandamide, endocannabinoid system, opioid system, mechanical allodynia, burns, spinal nerve ligation, CB2 receptor, CB1 receptor, analgesia, URB597, endocannabinoids, neuropathic pain, inflammatory pain, SR144528

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