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Journal of Dental Research
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*Compound via MeSH
*Substance via MeSH
Hazardous Substances DB
*CALCIUM COMPOUNDS
*CALCIUM, ELEMENTAL
*CAPSAICIN
*EUGENOL
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Biological

Activation of Vanilloid Receptor 1 (VR1) by Eugenol

B.H. Yang*, Z.G. Piao*, Y.-B. Kim, C.-H. Lee, J.K. Lee, K. Park, J.S. Kim and S.B. Oh#

Department of Physiology, College of Dentistry and Dental Research Institute, Seoul National University, 28-2 Yeongeon-Dong ChongNo-Ku, Seoul, Korea 110-749;

Correspondence: #corresponding author, odolbae{at}snu.ac.kr

The structural similarity of eugenol with capsaicin suggests that these two agents may share molecular mechanisms to produce their effects. We investigated the effects of eugenol in comparison with those of capsaicin using whole-cell patch clamp and Fura-2-based calcium-imaging techniques in a heterologous expression system and with sensory neurons. In vanilloid receptor 1 (VR1)-expressing human embryonic kidney (HEK) 293 cells and trigeminal ganglion (TG) neurons, eugenol activated inward currents, whereas capsazepine, a competitive VR antagonist, and ruthenium red (RR), a functional VR antagonist, completely blocked eugenol-induced inward currents. Moreover, eugenol caused elevation of [Ca2+]i, and this was completely abolished by both capsazepine and ruthenium red in VR1-expressing HEK 293 cells and TG neurons. Our results provide strong evidence that eugenol produces its effects, at least in part, via VR1 expressed by the sensory nerve endings in the teeth.

Key Words: eugenol • capsaicin • trigeminal ganglion • HEK 293 cells • vanilloid receptor 1

Journal of Dental Research, Vol. 82, No. 10, 781-785 (2003)
DOI: 10.1177/154405910308201004
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