NDLI: Activation and Inhibition of Mouse Muscle and Neuronal Nicotinic Acetylcholine Receptors Expressed in Xenopus Oocytes

Content Provider	PubMed Central
Author	Papke, Roger L. Wecker, Lynn Stitzel, Jerry A.
Abstract	Transgenic mouse models with nicotinic acetylcholine receptor (nAChR) knockouts and knockins have provided important insights into the molecular substrates of addiction and disease. However, most studies of heterologously expressed neuronal nAChR have used clones obtained from other species, usually human or rat. In this work, we use mouse clones expressed in Xenopus oocytes to provide a relatively comprehensive characterization of the three primary classes of nAChR: muscle-type receptors, heteromeric neuronal receptors, and homomeric α7-type receptors. We evaluated the activation of these receptor subtypes with acetylcholine and cytisine-related compounds, including varenicline. We also characterized the activity of classic nAChR antagonists, confirming the utility of mecamylamine and dihydro-β-erythroidine as selective antagonists in mouse models of α3β4 and α4β2 receptors, respectively. We also conducted an in-depth analysis of decamethonium and hexamethonium on muscle and neuronal receptor subtypes. Our data indicate that, as with receptors cloned from other species, pairwise expression of neuronal α and β subunits in oocytes generates heterogeneous populations of receptors, most likely caused by variations in subunit stoichiometry. Coexpression of the mouse α5 subunit had varying effects, depending on the other subunits expressed. The properties of cytisine-related compounds are similar for mouse, rat, and human nAChR, except that varenicline produced greater residual inhibition of mouse α4β2 receptors than with human receptors. We confirm that decamethonium is a partial agonist, selective for muscle-type receptors, but also note that it is a nondepolarizing antagonist for neuronal-type receptors. Hexamethonium was a relatively nonselective antagonist with mixed competitive and noncompetitive activity.
Related Links	http://dx.doi.org/10.1124/jpet.109.164566
Ending Page	518
Page Count	18
Starting Page	501
File Format	PDF
ISSN	00223565
e-ISSN	15210103
Journal	The Journal of Pharmacology and Experimental Therapeutics
Issue Number	2
Volume Number	333
Language	English
Publisher	The American Society for Pharmacology and Experimental Therapeutics
Publisher Date	2010-05-01
Access Restriction	Open
Rights Holder	The American Society for Pharmacology and Experimental Therapeutics
Subject Keyword	Molecular Medicine Pharmacology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Medicine Pharmacology

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