Cited by 117Cannabis and Cannabinoid ResearchPain Mechanisms and TreatmentsCancer Treatment and Pharmacology

Selective Activation of Cannabinoid CB2 Receptors Suppresses Neuropathic Nociception Induced by Treatment with the Chemotherapeutic Agent Paclitaxel in Rats

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Rahn, Elizabeth J., Zvonok, Alexander M., Thakur, Ganesh A., Khanolkar, Atmaram D., Makriyannis, Alexandros, Hohmann, Andrea G.·2008·The Journal of Pharmacology and Experimental Therapeutics

Abstract

Activation of cannabinoid CB(2) receptors suppresses neuropathic pain induced by traumatic nerve injury. The present studies were conducted to evaluate the efficacy of cannabinoid CB(2) receptor activation in suppressing painful peripheral neuropathy evoked by chemotherapeutic treatment with the antitumor agent paclitaxel. Rats received paclitaxel (2 mg/kg i.p./day) on 4 alternate days to induce mechanical hypersensitivity (mechanical allodynia). Mechanical allodynia was defined as a lowering of the threshold for paw withdrawal to stimulation of the plantar hind paw surface with an electronic von Frey stimulator. Mechanical allodynia developed in paclitaxel-treated animals relative to groups receiving the Cremophor EL/ethanol/saline vehicle at the same times. Two structurally distinct cannabinoid CB(2) agonists, the aminoalkylindole (R,S)-AM1241 [(R,S)-(2-iodo-5-nitrophenyl)-[1-((1-methyl-piperidin-2-yl)methyl)-1H-indol-3-yl]-methanone] and the cannabilactone AM1714 (1,9-dihydroxy-3-(1',1'-dimethylheptyl)-6H-benzo[c]chromene-6-one), produced a dose-related suppression of established paclitaxel-evoked mechanical allodynia after systemic administration. Pretreatment with the CB(2) antagonist SR144528 [5-(4-chloro-3-methylphenyl)-1-(4-methylbenzyl)-N-(1,3,3-trimethylbicyclo[2.2.1]heptan-2-yl)-1H-pyrazole-3-carboxamide], but not the CB(1) antagonist SR141716 [5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-N-(piperidin-1-yl)-1H-pyrazole-3-carboxamide], blocked the antiallodynic effects of both (R,S)-AM1241 and AM1714. Moreover, (R)-AM1241, but not (S)-AM1241, suppressed paclitaxel-evoked mechanical allodynia relative to either vehicle treatment or preinjection thresholds, consistent with mediation by CB(2). Administration of either the CB(1) or CB(2) antagonist alone failed to alter paclitaxel-evoked mechanical allodynia. Moreover, (R,S)-AM1241 did not alter paw withdrawal thresholds in rats that received the Cremophor EL vehicle in lieu of paclitaxel, whereas AM1714 induced a modest antinociceptive effect. Our data suggest that cannabinoid CB(2) receptors may be important therapeutic targets for the treatment of chemotherapy-evoked neuropathy.

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Authors
Rahn, E. J., Zvonok, A. M., Thakur, G. A., Khanolkar, A. D., Makriyannis, A., & Hohmann, A. G.
Affiliations
  • University of Georgia (US)
  • Northeastern University (US)
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
2008-11
Volume
327
Issue
2
Pages
584-591
ISSN
0022-3565 (ISSN-L)
OpenAlex
W2093570206
Cited by
116
References
41
Citations by year
2026: 1 · 2025: 7 · 2024: 5 · 2023: 4 · 2022: 5 · 2021: 9 · 2020: 7 · 2019: 10 · 2018: 10 · 2017: 8 · 2016: 4 · 2015: 2 · 2014: 6 · 2013: 6 · 2012: 11
FWCI
4.90
Type
journal article
Language
en
Open access
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute on Drug Abuse (DA3801, DA022478, DA-022702, DA 9158, R01DA003801, R21DA022478, R01DA021644, R37DA003801, R21DA022702, P01DA009158, DA021644)
Topics
  • Health Sciences › Medicine › Pharmacology › Cannabis and Cannabinoid Research
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
  • Health Sciences › Medicine › Oncology › Cancer Treatment and Pharmacology
Keywords
CB2 receptor, paclitaxel-induced neuropathic pain, chemotherapy-induced peripheral neuropathy, mechanical allodynia, CB2 receptor agonist, AM1241, SR144528, CB1 receptor, enantiomers, analgesia
MeSH terms
Animals, Antineoplastic Agents, Phytogenic, Cannabinoids, Chromones, Dimethyl Sulfoxide, Male, Morphine, Neuralgia, Stereoisomerism, Rats, Sprague-Dawley, Paclitaxel, Pain Threshold, Receptor, Cannabinoid, CB2, Rats

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