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• W2003675844 endingPage "1313" @default.
• W2003675844 startingPage "1306" @default.
• W2003675844 abstract "Positive allosteric modulators (PAMs) of nicotinic acetylcholine receptors (nAChRs) have attracted considerable interest as a novel area of therapeutic drug discovery. Two types of α7-selective PAMs have been identified (type I and type II). Whilst both potentiate peak agonist-induced responses, they have different effects on the rate of agonist-induced receptor desensitization. Type I PAMs have little or no effect on the rapid rate of desensitization that is characteristic of α7 nAChRs, whereas type II PAMs cause dramatic slowing of receptor desensitization. Previously, we have obtained evidence indicating that PNU-120596, a type II PAM, causes potentiation by interacting with an allosteric transmembrane site. In contrast, other studies have demonstrated the importance of the 'M2-M3 segment' in modulating the effects of the type I PAM NS1738 and have led to the proposal that NS1738 may interact with the extracellular N-terminal domain. Here, our aim has been to compare the mechanism of allosteric potentiation of α7 nAChRs by NS1738 and PNU-120596. Functional characterization of a series of mutated α7 nAChRs indicates that mutation of amino acids within a proposed intrasubunit transmembrane cavity have a broadly similar effect on these two PAMs. In addition, we have employed a functional assay designed to examine the ability of ligands to act competitively at either the orthosteric or allosteric binding site of α7 nAChRs. These data, together with computer docking simulations, lead us to conclude that both the type I PAM NS1738 and the type II PAM PNU-120596 bind competitively at a mutually exclusive intrasubunit transmembrane site." @default.
• W2003675844 created "2016-06-24" @default.
• W2003675844 creator A5053669541 @default.
• W2003675844 creator A5070982515 @default.
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• W2003675844 date "2011-12-01" @default.
• W2003675844 modified "2023-10-12" @default.
• W2003675844 title "Competitive binding at a nicotinic receptor transmembrane site of two α7-selective positive allosteric modulators with differing effects on agonist-evoked desensitization" @default.
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• W2003675844 doi "https://doi.org/10.1016/j.neuropharm.2011.07.035" @default.
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