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Wei Xu Yujun Wang Zhongze Ma Yi-Ting Chiu Peng Huang Khampaseuth Rasakham Ellen Unterwald David Y.-W. Lee Lee-Yuan Liu-Chen 《Drug and alcohol dependence》2013
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共查询到1条相似文献,搜索用时 0 毫秒
1.
Wei Xu Yujun Wang Zhongze Ma Yi-Ting Chiu Peng Huang Khampaseuth Rasakham Ellen Unterwald David Y.-W. Lee Lee-Yuan Liu-Chen 《Drug and alcohol dependence》2013
BackgroundWe previously reported isolation of l-isocorypalmine (l-ICP), a mono-demethylated analog of l-tetrahydropalmatine (l-THP), from the plant Corydalis yanhusuo. Here we characterized its in vitro pharmacological properties and examined its effects on cocaine-induced behaviors in mice.MethodsReceptor binding, cAMP and [35S]GTPγS assays were used to examine pharmacological actions of l-ICP in vitro. Effects of l-ICP on cocaine-induced locomotor hyperactivity and sensitization and conditioned place preference (CPP) in mice were investigated. HPLC was employed to analyze metabolites of l-ICP in mouse serum.ResultsAmong more than 40 targets screened, l-ICP and l-THP bound only to dopamine (DA) receptors. l-ICP was a high-affinity partial agonist of D1 and D5 receptors and a moderate-affinity antagonist of D2, D3 and D4 receptors, whereas l-THP bound to only D1 and D5 receptors, with lower affinities than l-ICP. At 10 mg/kg (i.p.), l-ICP inhibited spontaneous locomotor activity for a shorter time than l-THP. Pretreatment with l-ICP reduced cocaine-induced locomotor hyperactivities. Administration of l-ICP before cocaine once a day for 5 days reduced cocaine-induced locomotor sensitization on days 5 and 13 after 7 days of withdrawal. Pretreatment with l-ICP before cocaine daily for 6 days blocked cocaine-induced CPP, while l-ICP itself did not cause preference or aversion. HPLC analysis showed that l-ICP was the main compound in mouse serum following i.p. injection of l-ICP.Conclusionsl-ICP likely acts as a D1 partial agonist and a D2 antagonist to produce its in vivo effects and may be a promising agent for treatment of cocaine addiction. 相似文献 |
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