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The Journal of Neuroscience, October 15, 1998, 18(20):8228-8235
Synaptic Potentials Mediated via -Bungarotoxin-Sensitive
Nicotinic Acetylcholine Receptors in Rat Hippocampal Interneurons
Charles J.
Frazier1,
Amber V.
Buhler2,
Jeffrey
L.
Weiner1, and
Thomas V.
Dunwiddie1, 2, 3
1 Neuroscience Program and 2 Department of
Pharmacology, University of Colorado Health Sciences Center, Denver,
Colorado 80262, and 3 Veterans Affairs Medical Research
Service, Denver, Colorado 80220
Exogenous application of acetylcholine elicits inward currents in
hippocampal interneurons that are mediated via
-bungarotoxin-sensitive nicotinic acetylcholine receptors, but
synaptic responses mediated via such receptors have never been reported
in mammalian brain. In the present study, EPSCs were evoked in
hippocampal interneurons in rat brain slices by electrical stimulation
and were recorded by using whole-cell voltage-clamp techniques.
Nicotinic EPSCs were isolated pharmacologically, using
antagonists to block other known types of ligand-gated ion channels,
and then were tested with either -bungarotoxin or
methyllycaconitine, which are selective antagonists for nicotinic
acetylcholine receptors that contain the 7 receptor subunit. Each
antagonist proved highly effective at reducing the remaining synaptic
current. Evoked 7-mediated nicotinic EPSCs also were desensitized by
superfusion with 1 µM nicotine, had extrapolated reversal
potentials near 0 mV, and showed strong inward rectification at
positive potentials. In several interneurons,
methyllycaconitine-sensitive spontaneous EPSCs also were observed that
exhibited a biphasic decay rate very similar to that of the
7-mediated evoked response. These studies provide the first
demonstration of a functional cholinergic synapse in the mammalian
brain, in which the primary postsynaptic receptors are
-bungarotoxin-sensitive nicotinic acetylcholine receptors.
Key words:
nicotine; hippocampus; interneuron; rat; acetylcholine; electrophysiology
Copyright © 1998 Society for Neuroscience 0270-6474/98/18208228-08$05.00/0
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