title: Partial Activation and Inhibition of TRPV1 Channels by Evodiamine and Rutaecarpine, Two Major Components of the Fruits of Evodia rutaecarpa.
abstract: Evodiamine (1) and rutaecarpine (2) are the two major components of Evodia rutaecarpa, which has long been used in traditional medicine for the treatment of many diseases. Using transient receptor potential vanilloid 1 (TRPV1)-expressing HEK293 cells and patch-clamp recording, the inhibitory actions of 1 and 2 against TRPV1 channels were investigated. The effects of these compounds against capsaicin- or proton-activated TRPV1 activities were evaluated. The results showed that, although 1 and 2 can activate TRPV1, the maximum response was 3.5- or 9-fold lower than that of capsaicin, respectively, suggesting partial agonism. In comparison to capsaicin, coadministration of 1 and capsaicin increased the half-maximal effective concentration (EC50) of capsaicin-activated TRPV1 currents as shown by a right shift in the dose-response curve, whereas coadministration of 1 with protons failed to inhibit the proton-induced current. Moreover, preadministration of 1, but not 2, inhibited both capsaicin- and proton-induced TRPV1 currents, which might involve channel desensitization. Taken together, 1 and 2 may share the same binding site with capsaicin and act as partial agonists (antagonists) of TRPV1. Evodiamine (1), but not rutaecarpine (2), can desensitize or competitively inhibit the activity of TRPV1.
authors.affiliation: Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences , Kobe, Hyogo 6508530, Japan.|Traditional Medicine Research Center, Chinese Medicine Confucius Institute at Hyogo College of Medicine , Kobe, Hyogo 6508530, Japan.
authors.forename: Shenglan
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences , Kobe, Hyogo 6508530, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamamoto
authors.affiliation: Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences , Kobe, Hyogo 6508530, Japan.
authors.forename: Yoko
authors.initials: Y
authors.lastname: Kogure
authors.affiliation: State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University , Beijing 100875, People's Republic of China.
authors.forename: Wensheng
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Traditional Medicine Research Center, Chinese Medicine Confucius Institute at Hyogo College of Medicine , Kobe, Hyogo 6508530, Japan.|Department of Anatomy and Neuroscience, Hyogo College of Medicine , Nishinomiya, Hyogo 6638501, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Noguchi
authors.affiliation: Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences , Kobe, Hyogo 6508530, Japan.|Traditional Medicine Research Center, Chinese Medicine Confucius Institute at Hyogo College of Medicine , Kobe, Hyogo 6508530, Japan.|Department of Anatomy and Neuroscience, Hyogo College of Medicine , Nishinomiya, Hyogo 6638501, Japan.
authors.forename: Yi
authors.initials: Y
authors.lastname: Dai
mesh_terms: D000818:Animals; D002211:Capsaicin / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D032086:Evodia / Q000737:chemistry*; D005638:Fruit / Q000737:chemistry*; D057809:HEK293 Cells; D006801:Humans; D026121:Indole Alkaloids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D015394:Molecular Structure; D011799:Quinazolines / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D050916:TRPV Cation Channels / Q000037:antagonists & inhibitors* / Q000187:drug effects; D052999:Quinazolinones
chemical_list: D002211:Capsaicin; D026121:Indole Alkaloids; D011799:Quinazolines; D050916:TRPV Cation Channels; C028632:rutecarpine; D052999:Quinazolinones; C049639:evodiamine