期刊
BIOCHEMICAL PHARMACOLOGY
卷 94, 期 2, 页码 155-163出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bcp.2015.01.011
关键词
Conotoxin; Allosteric; Nicotinic; Alpha7; NMR
资金
- NHMRC Program [APP1072113]
- University of Queensland Early Career
- ARC Future Fellowships [FT130101215]
- NLD [FT1100100226]
MrIC is a recently described selective agonist of endogenously expressed alpha 7 nAChR. In this study, we further characterize the pharmacological activity of MrIC using Ca2+ imaging approaches in SH-SY5Y cells endogenously expressing alpha 7 nAChR and demonstrate that MrIC exclusively activates alpha 7 nAChR modulated by type II positive allosteric modulators, including PNU120596. MrIC was a full agonist at PNU120596-modulated alpha 7 nAChR compared with choline, albeit with slower kinetics, but failed to elicit a Ca2+ response in the absence of PNU120596. Interestingly, the NMR structure of MrIC showed a typical 4/7 alpha-conotoxin fold, indicating that its unusual pharmacological activity is likely sequence-dependent. Overall, our results suggest that MrIC acts as a biased agonist that can only activate alpha 7 nAChR modified by type II positive allosteric modulators, and thus represents a valuable tool to probe the pharmacological properties of this important ion channel. (C) 2015 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据