Effects of dextrorotatory morphinans on alpha3beta4 nicotinic acetylcholine receptors expressed in Xenopus oocytes.

We previously demonstrated that dextromethorphan (DM; 3-methoxy-17-methylmorphinan) analogs have neuroprotective effects, and a recent report showed that DM reduces the adverse effects of morphine and blocks alpha3beta4 nicotinic acetylcholine receptors, a major target of anti-addictive agents. Here, we investigated the effects of DM, three of its analogs (DF, 3-methyl-17-methylmorphinan; AM, 3-allyloxy-17-methoxymorphian; and CM, 3-cyclopropyl-17-methoxymorphinan) and one of its metabolites (HM; 3-methoxymorphinan), on neuronal alpha3beta4 nicotinic acetylcholine receptor channel activity expressed in Xenopus laevis oocytes, using the two-microelectrode voltage clamp technique. We found that intraoocyte injection of neuronal alpha3 and beta4 nicotinic acetylcholine receptor subunit cRNAs elicited an inward current (IACh) in the presence of acetylcholine. Co-treatment with DM, DF, AM, CM or HM inhibited IACh in a dose-dependent, voltage-independent and reversible manner. The IC50 values for DM, DF, AM, CM and HM were 19.5+/-5.2, 15.8+/-4.5, 16.3+/-1.7, 10.1+/-2.8, and 13.5+/-4.0 microM, respectively. The order of potency for the inhibition of IACh was CM>HM>DF=AM>DM in oocytes expressing alpha3beta4 nicotinic acetylcholine receptors. The inhibitions of (IACh) by DM, DF and HM, AM and CM were non-competitive. These results indicate that AM, CM and HM could be novel non-competitive agents regulating alpha3beta4 nicotinic acetylcholine receptor channel activity.

Citation

Jun-Ho Lee, Eun-Joo Shin, Sang Min Jeong, Jong-Hoon Kim, Byung-Hwan Lee, In-Soo Yoon, Joon-Hee Lee, Sun-Hye Choi, Sang-Mok Lee, Phil Ho Lee, Hyoung-Chun Kim, Seung-Yeol Nah. Effects of dextrorotatory morphinans on alpha3beta4 nicotinic acetylcholine receptors expressed in Xenopus oocytes. European journal of pharmacology. 2006 Apr 24;536(1-2):85-92

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PMID: 16563374

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