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The Journal of Neuroscience, October 15, 1998, 18(20):8228-8235

Synaptic Potentials Mediated via alpha -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 alpha -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 alpha -bungarotoxin or methyllycaconitine, which are selective antagonists for nicotinic acetylcholine receptors that contain the alpha 7 receptor subunit. Each antagonist proved highly effective at reducing the remaining synaptic current. Evoked alpha 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 alpha 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 alpha -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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