1,8-cineole, a TRPM8 agonist, is a novel natural antagonist of human TRPA1

Molecular Pain

Makoto Tominaga²  Mayumi Shimizu¹  Chihiro Hatai (Uotsu)¹  Maki Sawada (Shimizu)¹  Satoshi Yamamoto¹  Kunitoshi Uchida²  Fumitaka Fujita¹  Masayuki Takaishi¹ 

[1] Central Research Laboratories, Mandom Corporation, Osaka, 540-8530, Japan;Department of Physiological Sciences, The Graduate University for Advanced Studies, Okazaki, 444-8585, Japan

关键词: TRPA1;    TRP channels;    Pain relief;    1,8-cineole;   

Others  :  862682
DOI  :  10.1186/1744-8069-8-86

 received in 2012-10-08, accepted in 2012-11-26,  发布年份 2012

【 摘 要 】

Background

Essential oils are often used in alternative medicine as analgesic and anti-inflammatory remedies. However, the specific compounds that confer the effects of essential oils and the molecular mechanisms are largely unknown. TRPM8 is a thermosensitive receptor that detects cool temperatures and menthol whereas TRPA1 is a sensor of noxious cold. Ideally, an effective analgesic compound would activate TRPM8 and inhibit TRPA1.

Results

We screened essential oils and fragrance chemicals showing a high ratio of human TRPM8-activating ability versus human TRPA1-activating ability using a Ca²⁺-imaging method, and identified 1,8-cineole in eucalyptus oil as particularly effective. Patch-clamp experiments confirmed that 1,8-cineole evoked inward currents in HEK293T cells expressing human TRPM8, but not human TRPA1. In addition, 1,8-cineole inhibited human TRPA1 currents activated by allyl isothiocyanate, menthol, fulfenamic acid or octanol in a dose-dependent manner. Furthermore, in vivo sensory irritation tests showed that 1,8-cineole conferred an analgesic effect on sensory irritation produced by TRPA1 agonists octanol and menthol. Surprisingly, 1,4-cineole, which is structurally similar and also present in eucalyptus oil, activated both human TRPM8 and human TRPA1.

Conclusions

1,8-cineole is a rare natural antagonist of human TRPA1 that has analgesic and anti-inflammatory effects possibly due to its inhibition of TRPA1.

【 授权许可】

   
2012 Takaishi et al.; licensee BioMed Central Ltd.

【 图 表 】

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