Cited by 345Cannabis and Cannabinoid ResearchPain Mechanisms and TreatmentsIon Channels and Receptors

Blockade of Endocannabinoid-Degrading Enzymes Attenuates Neuropathic Pain

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Kinsey, S.G., Long, J.Z., O’Neal, S.T., Abdullah, R.A., Poklis, J.L., Boger, D.L., Cravatt, B.F., Lichtman, A.H.·2009·The Journal of Pharmacology and Experimental Therapeutics

Abstract

Direct-acting cannabinoid receptor agonists are well known to reduce hyperalgesic responses and allodynia after nerve injury, although their psychoactive side effects have damped enthusiasm for their therapeutic development. Alternatively, inhibiting fatty acid amide hydrolase (FAAH) and monoacylglycerol lipase (MAGL), the principal enzymes responsible for the degradation of the respective endogenous cannabinoids, anandamide (AEA) and 2-arachydonylglycerol (2-AG), reduce nociception in a variety of nociceptive assays, with no or minimal behavioral effects. In the present study we tested whether inhibition of these enzymes attenuates mechanical allodynia, and acetone-induced cold allodynia in mice subjected to chronic constriction injury of the sciatic nerve. Acute administration of the irreversible FAAH inhibitor, cyclohexylcarbamic acid 3'-carbamoylbiphenyl-3-yl ester (URB597), or the reversible FAAH inhibitor, 1-oxo-1-[5-(2-pyridyl)-2-yl]-7-phenylheptane (OL-135), decreased allodynia in both tests. This attenuation was completely blocked by pretreatment with either CB(1) or CB(2) receptor antagonists, but not by the TRPV1 receptor antagonist, capsazepine, or the opioid receptor antagonist, naltrexone. The novel MAGL inhibitor, 4-nitrophenyl 4-(dibenzo[d][1,3]dioxol-5-yl(hydroxy)methyl)piperidine-1-carboxylate (JZL184) also attenuated mechanical and cold allodynia via a CB(1), but not a CB(2), receptor mechanism of action. Whereas URB597 did not elicit antiallodynic effects in FAAH(-/-) mice, the effects of JZL184 were FAAH-independent. Finally, URB597 increased brain and spinal cord AEA levels, whereas JZL184 increased 2-AG levels in these tissues, but no differences in either endo-cannabinoid were found between nerve-injured and control mice. These data indicate that inhibition of FAAH and MAGL reduces neuropathic pain through distinct receptor mechanisms of action and present viable targets for the development of analgesic therapeutics.

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Crossref · 10.1124/jpet.109.155465

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  • Ceiling effects and other methodological differences between studies may have precluded the detection of enhanced nociceptive behavior in neuropathic pain models.

    “though ceiling effects and other methodological differences between studies may have precluded the detection of enhanced nociceptive behavior.”
  • Other studies using knockout mice or selective inhibitors of CB1 or CB2 receptors show no alterations of nociceptive behavior in neuropathic pain models.

    “However, other studies using knockout mice or selective inhibitors of CB 1 or CB 2 receptors show no alterations of nociceptive behavior in neuropathic pain models (Kinsey et al, 2009(Kinsey et al, , 2010) ) though ceiling effects and other methodological differences between studies may have precluded the detection of enhanced nociceptive behavior.”
  • OL135 and URB597 are antinociceptive in FAAH+/+ mice but fail to produce an effect in FAAH-/- mice.

    “Additionally both OL135 and URB597 are antinociceptive in FAAH+/+ mice, but fail to produce an effect in FAAH-/- mice.59”
  • OL135 and URB597 attenuate cold and mechanical allodynia in a manner that is dependent upon activation of both CB1 and CB2 receptors.

    “OL135 and URB597 attenuate cold and mechanical allodynia in a manner that is dependent upon activation of both CB1 and CB2 receptors.59”
  • The MGL inhibitor JZL184 attenuates CCI-induced mechanical and cold allodynia through indirect activation of the CB1 receptor and is efficacious in both FAAH+/+ and FAAH-/- mice.

    “The novel MGL inhibitor, JZL184, attenuates CCI-induced mechanical and cold allodynia through indirect activation of the CB1 receptor; JZL184 was efficacious in attenuating neuropathic nociception in both FAAH+/+ and FAAH-/- mice.59”

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Authors
Kinsey, S. G., Long, J. Z., O’Neal, S. T., Abdullah, R. A., Poklis, J. L., Boger, D. L., Cravatt, B. F., & Lichtman, A. H.
Affiliations
  • Virginia Commonwealth University (US)
  • Scripps Research Institute (US)
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
2009-09
Volume
330
Issue
3
Pages
902-910
ISSN
0022-3565 (ISSN-L)
OpenAlex
W2132380973
Cited by
330
References
43
Citations by year
2026: 9 · 2025: 14 · 2024: 13 · 2023: 8 · 2022: 7 · 2021: 15 · 2020: 9 · 2019: 14 · 2018: 21 · 2017: 24 · 2016: 16 · 2015: 21 · 2014: 35 · 2013: 29 · 2012: 33
FWCI
24.43
Type
journal article
Language
en
Open access
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Institute of International Education
  • National Institute on Drug Abuse (DA015197, P01DA009789, DA-017259, R01DA015197, DA009789-11, DA007027-32, P01DA017259, DA 009789, DA015648, T32DA007027, DA007027)
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
neuropathic pain, endocannabinoid system, fatty acid amide hydrolase, monoacylglycerol lipase, anandamide, 2-arachidonoylglycerol, CB1 receptor, CB2 receptor, URB597, JZL184, chronic constriction injury, mechanical allodynia, cold allodynia, analgesic drug development
MeSH terms
Fatty Acid Amide Hydrolases, Amidohydrolases, Animals, Arachidonic Acids, Benzamides, Carbamates, Cold Temperature, Enzyme Inhibitors, Glycerides, Hyperalgesia, Male, Mice, Inbred C57BL, Monoacylglycerol Lipases, Narcotic Antagonists, Pain, Pain Measurement, Peripheral Nervous System Diseases, Piperidines, Pyridines, Analgesics, Non-Narcotic, Receptor, Cannabinoid, CB1, Receptor, Cannabinoid, CB2, TRPV Cation Channels, Mice, Benzodioxoles, Polyunsaturated Alkamides, Cannabinoid Receptor Modulators, Endocannabinoids

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