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J Pain. 2010 Nov;11(11):1222-9. doi: 10.1016/j.jpain.2010.02.022. Epub 2010 May 8.

The antinociceptive effect of (-)-linalool in models of chronic inflammatory and neuropathic hypersensitivity in mice.

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Department of Pharmacology, Center of Biological Science, Federal University of Santa Catarina, Florianopolis, SC, Brazil.


We used multiple pain models to investigate the effects of (-)-linalool, a monoterpene alcohol present in the essential oil of plants, on chronic inflammatory and neuropathic hypersensitivity in adult Swiss mice. Inflammatory or neuropathic hypersensitivity was induced by intraplantar ( injection of complete Freund's adjuvant (CFA) or partial sciatic nerve ligation (PSNL), respectively. Twenty-four hours after CFA injection, we used Von Frey filaments and acetone-evoked cooling to evaluate tactile and thermal hypersensitivity, respectively. A single i.p. injection of (-)-linalool (50 or 200 mg/kg) administered 30 minutes before testing reduced CFA-induced mechanical hypersensitivity. Similarly, (-)-linalool reduced acetone-evoked hypersensitivity up to 4 hours after treatment. Compared with vehicle, (-)-linalool produced a marked reduction in CFA-induced paw edema. (-)-Linalool also reduced mechanical hypersensitivity induced by PSNL 7 days after injury. Multiple (-)-linalool treatments given chronically (twice a day for 10 days; 50 mg/kg, i.p.) significantly reduced mechanical hypersensitivity induced by CFA and PSNL. This multidose strategy did not cause tolerance. We also reasoned that (-)-linalool might reduce nociceptive behavior in response to direct administration of inflammatory mediators. Therefore, we injected the cytokines IL-1β (.1 pg/site) and TNF-α (1 pg/site) intrathecally. (-)-Linalool inhibited the biting response induced by IL-1β and TNF-α.


The article adds information about antinociceptive properties of (-)-linalool in chronic inflammatory and neuropathic hypersensitivity. It also indicates that (-)-linalool might be potentially interesting in the development of new clinically relevant drugs for the management of persistent pain.

[Indexed for MEDLINE]

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