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Research ArticleNeuropharmacology

Antinociceptive and Antihyperalgesic Effects of Tapentadol in Animal Models of Inflammatory Pain

Klaus Schiene, Jean De Vry and Thomas M. Tzschentke
Journal of Pharmacology and Experimental Therapeutics November 2011, 339 (2) 537-544; DOI: https://doi.org/10.1124/jpet.111.181263
Klaus Schiene
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Jean De Vry
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Thomas M. Tzschentke
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Abstract

The novel analgesic tapentadol HCl [(−)-(1R,2R)-3-(3-dimethylamino)-1-ethyl-2-methyl-propyl)-phenol hydrochloride] combines μ-opioid receptor (MOR) agonism and noradrenaline reuptake inhibition (NRI) in a single molecule and shows a broad efficacy profile in various preclinical pain models. This study analyzed the analgesic activity of tapentadol in experimental inflammatory pain. Analgesia was evaluated in the formalin test (pain behavior, rat and mouse), carrageenan-induced mechanical hyperalgesia (paw-pressure test, rat), complete Freund's adjuvant (CFA)-induced paw inflammation (tactile hyperalgesia, rat), and CFA knee-joint arthritis (weight bearing, rat). Tapentadol showed antinociceptive activity in the rat and mouse formalin test with an efficacy of 88 and 86% and ED50 values of 9.7 and 11.3 mg/kg i.p., respectively. Tapentadol reduced mechanical hyperalgesia in carrageenan-induced acute inflammatory pain by 84% with an ED50 of 1.9 mg/kg i.v. In CFA-induced tactile hyperalgesia, tapentadol showed 71% efficacy with an ED50 of 9.8 mg/kg i.p. The decrease in weight bearing after CFA injection in one knee joint was reversed by tapentadol by 51% with an ED25 of 0.9 mg/kg i.v. Antagonism studies were performed with the MOR antagonist naloxone and the α2-noradrenergic receptor antagonist yohimbine in the carrageenan- and CFA-induced hyperalgesia model. In the CFA model, the serotonergic receptor antagonist ritanserin was also tested. The effect of tapentadol was partially blocked by naloxone and yohimbine and completely blocked by the combination of both, but it was not affected by ritanserin. In summary, tapentadol showed antinococeptive/antihyperalgesic analgesic activity in each model of acute and chronic inflammatory pain, and the antagonism experiments suggest that both MOR activation and NRI contribute to its analgesic effects.

Footnotes

  • Financial support was provided by Grünenthal GmbH, Aachen, Germany.

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

    doi:10.1124/jpet.111.181263.

  • ABBREVIATIONS:

    CFA
    complete Freund's adjuvant
    ANOVA
    analysis of variance
    CI
    confidence interval
    MOR
    μ-opioid receptor
    NRI
    noradrenaline reuptake inhibition
    LSD
    least significant difference
    COX
    cyclooxygenase
    5-HT2
    5-hydroxytryptamine type 2
    SRI
    serotonin reuptake inhibitor.

  • Received March 10, 2011.
  • Accepted August 3, 2011.
  • Copyright © 2011 by The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 339 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 339, Issue 2
1 Nov 2011
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Research ArticleNeuropharmacology

Tapentadol in Inflammatory Pain

Klaus Schiene, Jean De Vry and Thomas M. Tzschentke
Journal of Pharmacology and Experimental Therapeutics November 1, 2011, 339 (2) 537-544; DOI: https://doi.org/10.1124/jpet.111.181263

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Research ArticleNeuropharmacology

Tapentadol in Inflammatory Pain

Klaus Schiene, Jean De Vry and Thomas M. Tzschentke
Journal of Pharmacology and Experimental Therapeutics November 1, 2011, 339 (2) 537-544; DOI: https://doi.org/10.1124/jpet.111.181263
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