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Phytother Res. 2013 Oct;27(10):1557-63. doi: 10.1002/ptr.4902. Epub 2012 Dec 3.

Antinociceptive effect of lupeol: evidence for a role of cytokines inhibition.

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1
Centro de Pesquisas Gonçalo Moniz, Fundação Oswaldo Cruz, Salvador, Bahia, Brazil; Universidade Estadual de Feira de Santana, Feira de Santana, Bahia, Brazil.

Abstract

The present study investigates the antinociceptive properties of lupeol in models of inflammatory and post-operative pain, as well as its mechanisms of action. The effects of lupeol were tested against acetic acid-induced writhing, formalin test, carrageenan-induced hyperalgesia, and post-operative pain model. Cytokine levels were determined by ELISA. Mice motor performance was evaluated in the rota rod and open-field tests. Pre-treatment of mice with lupeol (5-100 mg/kg IP) produced a dose-related inhibition of writhing in mice. The maximal antinociception produced by lupeol (60 mg/kg) was unaffected in mice pre-treated with yohimbine (α2 adrenoceptor antagonist; 2 mg/kg IP), L-arginine (substrate for nitric oxide synthase; 600 mg/kg IP), glibenclamide (the KATP-channel blocker; 2 mg/kg IP), and methysergide maleate (serotoninergic receptors antagonist; 5 mg/kg IP). Furthermore, lupeol (25-100 mg/kg) inhibited the late phase of formalin test. Pre-treatment with lupeol (50 and 100 mg/kg) inhibited the hyperalgesia and the local increase in tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) levels induced by carrageenan. In contrast, lupeol did not inhibit the post-operative pain. Lupeol-treated mice did not show any motor performance alterations or apparent systemic toxicity. Our results demonstrate that lupeol has consistent antinociceptive properties during inflammatory pain, but not post-operative pain, acting through the inhibition of IL-1β and TNF-α production.

KEYWORDS:

Lonchocarpus araripensis; antinociception; cytokines; inflammatory pain; lupeol; post-operative pain

PMID:
23208998
DOI:
10.1002/ptr.4902
[Indexed for MEDLINE]
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