A Methyl Scan of the Pyrrolidinium Ring of Nicotine Reveals Significant Differences in Its Interactions with <i>α</i>7 and <i>α</i>4<i>β</i>2 Nicotinic Acetylcholine Receptors
作者:Hong Xing、Kristin W. Andrud、Ferenc Soti、Anne Rouchaud、Stephan C. Jahn、Ziang Lu、Yeh-Hyon Cho、Sophia Habibi、Patrick Corsino、Svetoslav Slavov、James R. Rocca、Jon M. Lindstrom、Ron J. Lukas、William R. Kem
DOI:10.1124/mol.119.118786
日期:2020.8
with α4β2 but not α7 receptors. The 2'-methylation uniquely enhanced binding and agonist potency at α7 receptors. Although 3'- and 5'-trans-methylations were much better tolerated by α7 receptors than α4β2 receptors, 4'-methylation decreased potency and efficacy at α7 receptors much more than at α4β2 receptors. Whereas cis-5'-methylnicotine lacked agonist activity and displayed a low affinity at both
脑中的两个主要烟碱型乙酰胆碱受体(nAChRs)是α4β2和α7亚型。使用吡咯烷鎓环的“甲基扫描”来检测尼古丁与这两个受体相互作用的差异。使用电压钳和放射性配体结合技术研究了每种甲基烟碱。每个环碳上的甲基化引起尼古丁受体相互作用的独特变化。用乙基取代1'-N-甲基或添加第二个1'-N-甲基可显着降低与α4β2的相互作用,但不能降低与α7受体的相互作用。2'-甲基化独特地增强了对α7受体的结合和激动剂效力。尽管α7受体比α4β2受体对3'-和5'-反甲基的耐受性更好,但4' -甲基化作用在α7受体上的效力和功效比在α4β2受体上更大。顺式5'-甲基烟碱缺乏激动剂活性,并且对两种受体均显示低亲和力,而反式5'-甲基烟碱则保留了相当大的α7受体活性。强大的吡啶基甲醛亚甲基烟碱类似物A84543的两个5'-甲基化类似物之间的差异与5'-甲基烟碱的发现一致。甲基烟碱与包含两个持续水的Lymnaea乙