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Jpn J Pharmacol June 1, 1998; 77 (2): 169-72.

Inhibitory effects of corymine-related compounds on glycine receptors expressed in Xenopus oocytes.

Leewanich P , Tohda M , Matsumoto K , Subhadhirasakul S , Takayama H , Aimi N , Watanabe H .

We examined the effects of 4 corymine-related compounds on glycine-induced chloride current in Xenopus oocytes. Dihydrocorymine, N-demethyl-3-epi-dihydrocorymine and deformylcorymine dose-dependently decreased the glycine current with IC50 values of 34, 37 and 55 microM, respectively. The effect of these compounds on the glycine current was more potent than that of pleiocarpamine (IC50 > 1 mM). N-demethyl-3-epi-dihydrocorymine and dihydrocorymine, at 100 microM, also decreased the gamma-aminobutyric acid-induced current by 65% and 22%, respectively, whereas deformylcorymine and pleiocarpamine failed. The inhibitory action of deformylcorymine on the glycine current was noncompetitive. These results suggest that deformylcorymine is a novel specific noncompetitive glycine receptor antagonist. The structure-activity relationship of these compounds was discussed.

PubMed ID: 9681574
Article link: Jpn J Pharmacol