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Research ArticleBehavioral Pharmacology

Dissociable Effects of the Cannabinoid Receptor Agonists Δ9-Tetrahydrocannabinol and CP55940 on Pain-Stimulated Versus Pain-Depressed Behavior in Rats

Andrew J. Kwilasz and S. Stevens Negus
Journal of Pharmacology and Experimental Therapeutics November 2012, 343 (2) 389-400; DOI: https://doi.org/10.1124/jpet.112.197780
Andrew J. Kwilasz
Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, Virginia
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S. Stevens Negus
Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, Virginia
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Abstract

Cannabinoid receptor agonists produce reliable antinociception in most preclinical pain assays but have inconsistent analgesic efficacy in humans. This disparity suggests that conventional preclinical assays of nociception are not sufficient for the prediction of cannabinoid effects related to clinical analgesia. To extend the range of preclinical cannabinoid assessment, this study compared the effects of the marijuana constituent and low-efficacy cannabinoid agonist Δ9-tetrahydrocannabinol (THC) and the high-efficacy synthetic cannabinoid agonist 3-(2-hydroxy-4-(1,1-dimethylheptyl)phenyl)-4-(3-hydroxypropyl)cyclohexanol (CP55940) in assays of pain-stimulated and pain-depressed behavior. Intraperitoneal injection of dilute lactic acid (1.8% in 1 ml/kg) stimulated a stretching response or depressed intracranial self-stimulation (ICSS) in separate groups of male Sprague-Dawley rats. THC (0.1–10 mg/kg) and CP55940 (0.0032–0.32 mg/kg) dose-dependently blocked acid- stimulated stretching but only exacerbated acid-induced depression of ICSS at doses that also decreased control ICSS in the absence of a noxious stimulus. Repeated THC produced tolerance to sedative rate-decreasing effects of THC on control ICSS in the absence of the noxious stimulus but failed to unmask antinociception in the presence of the noxious stimulus. THC and CP55940 also failed to block pain-related depression of feeding in rats, although THC did attenuate satiation-related depression of feeding. In contrast to the effects of the cannabinoid agonists, the clinically effective analgesic and nonsteroidal anti-inflammatory drug ketoprofen (1 mg/kg) blocked acid-stimulated stretching and acid-induced depression of both ICSS and feeding. The poor efficacy of THC and CP55940 to block acute pain-related depression of behavior in rats agrees with the poor efficacy of cannabinoids to treat acute pain in humans.

Footnotes

  • This research was supported by the National Institutes of Health National Institute of Neurological Disorders and Stroke [Grant R01-NS070715] and the National Institutes of Health National Institute on Drug Abuse [Grant F31-DA032267].

  • Article, publication date, and citation information can be found at http://jpet.aspetjournals.org.

    http://dx.doi.org/10.1124/jpet.112.197780.

  • ABBREVIATIONS:

    THC
    Δ9-tetrahydrocannabinol
    ICSS
    intracranial self-stimulation
    NSAID
    nonsteroidal anti-inflammatory drug
    MCR
    maximum control rate
    %MCR
    percentage of MCR
    ANOVA
    analysis of variance
    CP55940
    3-(2-hydroxy-4-(1,1-dimethylheptyl)phenyl)-4-(3-hydroxypropyl)cyclohexanol.

  • Received June 25, 2012.
  • Accepted August 13, 2012.
  • Copyright © 2012 by The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 343 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 343, Issue 2
1 Nov 2012
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Research ArticleBehavioral Pharmacology

Cannabinoids and Pain-Depressed Behavior

Andrew J. Kwilasz and S. Stevens Negus
Journal of Pharmacology and Experimental Therapeutics November 1, 2012, 343 (2) 389-400; DOI: https://doi.org/10.1124/jpet.112.197780

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Research ArticleBehavioral Pharmacology

Cannabinoids and Pain-Depressed Behavior

Andrew J. Kwilasz and S. Stevens Negus
Journal of Pharmacology and Experimental Therapeutics November 1, 2012, 343 (2) 389-400; DOI: https://doi.org/10.1124/jpet.112.197780
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