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Volume 17, Number 15,
Issue of August 1, 1997
pp. 5747-5759
Copyright ©1997 Society for Neuroscience
Influence of Subunit Composition on Desensitization of Neuronal
Acetylcholine Receptors at Low Concentrations of Nicotine
Received Dec. 30, 1996; revised April 18, 1997; accepted May 19, 1997.
Catherine P. Fenster1, 2,
M. Felicia Rains1,
Brett Noerager2,
Michael W. Quick1, 2, and
Robin A. J. Lester1, 2
Departments of 1 Neurobiology and
2 Physiology and Biophysics, University of Alabama at
Birmingham, Birmingham, Alabama 35294
The influence of and subunits on the properties of
nicotine-induced activation and desensitization of neuronal nicotinic acetylcholine receptors (nAChRs) expressed in Xenopus
oocytes was examined. Receptors containing 4 subunits were more
sensitive to activation by nicotine than 3-containing receptors. At
low concentrations of nicotine, nAChRs containing 2 subunits reached near-maximal desensitization more rapidly than 4-containing
receptors. The concentration of nicotine producing half-maximal
desensitization was influenced by the particular subunit expressed;
similar to results for activation, 4-containing receptors were more
sensitive to desensitizing levels of nicotine than 3-containing
receptors. The subunit also influenced the rate of recovery from
desensitization; this rate was approximately inversely proportional to
the apparent nicotine affinity for the desensitized state. The
homomeric 7 receptor showed the lowest sensitivity to nicotine for
both activation and desensitization; 7 nAChRs also demonstrated the
fastest desensitization kinetics. These subunit-dependent properties
remained in the presence of external calcium, although subtle, receptor
subtype-specific effects on both the apparent affinities for activation
and desensitization and the desensitization kinetics were noted. These
data imply that the subunit composition of various nAChRs determines
the degree to which receptors are desensitized and/or activated by tobacco-related levels of nicotine. The subtype-specific balance between receptor activation and desensitization should be considered important when the cellular and behavioral actions of nicotine are
interpreted.
Key words:
nicotinic receptor subtypes;
nicotine addiction;
ion
channel;
CNS;
desensitization;
regulation;
Xenopus oocytes;
calcium ions;
synaptic transmission
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