Planta Med 2000; 66(6): 526-530
DOI: 10.1055/s-2000-8615
Original Paper
Georg Thieme Verlag Stuttgart · New York

The Bronchoconstrictive Action of Evodiamine, an Indoloquinazoline Alkaloid Isolated from the Fruits of Evodia rutaecarpa, on Guinea-Pig Isolated Bronchus: Possible Involvement on Vanilloid Receptors

Yoshinori Kobayashi*, Yumiko Nakano, Kiyoko Hoshikuma, Yoshiharu Yokoo, Toshikazu Kamiya
  • Kyowa Hakko Kogyo Co., Ltd. Tsukuba Research Laboratories, Ibaraki, Japan
Further Information

Publication History

Publication Date:
31 December 2000 (online)

Abstract

Evodiamine, a constituent of Evodiae Fructus (Evodia rutaecarpa Benth., Rutaceae), produced a bronchial contraction that is resistant to atropine and abolished by pretreatment with a mixture of the NK1 and NK2 receptor antagonists. Contractile responses to evodiamine were examined in guinea-pig isolated bronchus and compared with those to capsaicin. Both compounds evoked bronchial contraction in a concentration-dependent manner. Maximal contractions for evodiamine and capsaicin were observed at concentrations of 3 μM and 1 μM, respectively. Capsazepine (10 μM), an established antagonist of vanilloid receptor (capsaicin receptor), competitively inhibited the bronchial contraction evoked by evodiamine, suggesting that evodiamine activated vanilloid receptors. Evodiamine (3 μM) and capsaicin (1 μM) produced complete crossed tachyphylaxis. Both compounds desensitized tissues to subsequent additions of either evodiamine or capsaicin. These results suggest that the evodiamine-induced contractile response of the bronchus could be attributed to the resultant tachykinin release from sensory neurons by binding of evodiamine to vanilloid receptors. Rutaecarpine, which belongs to the same indoloquinazoline-type alkaloid as evodiamine, showed neither bronchoconstrictive, desensitizing effects nor vanilloid antagonistic effects at all the concentrations examined (up to 200 μM).

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Dr. Y. Kobayashi

Kyowa Hakko Kogyo Co., Ltd. Tsukuba Research Laboratories

2, Miyukigaoka, Tsukuba-shi

Ibaraki, 305-0841

Japan

Email: yoshinori.kobayashi@kyowa.co.jp

Phone: +81- 298-56 4288