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Journal of Experimental Biology, Vol 182, Issue 1 255-264, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

Actions of vesamicol on an alpha-bungarotoxin-sensitive neuronal nicotinic acetylcholine receptor

SD Buckingham, SC Lummis, ML Balk, M Schroeder and DB Sattelle
AFRC Laboratory of Molecular Signalling, University of Cambridge, UK.

Electrophysiology and binding studies were used to determine the actions of vesamicol [2-(4-phenylpiperidino)cyclohexanol (AH5183)] on an alpha-bungarotoxin-sensitive, neuronal nicotinic acetylcholine receptor in the nervous system of the cockroach, Periplaneta americana. Electrophysiological studies on an identified motor neurone revealed a reversible blocking action of (+/-)-vesamicol on the response to ionophoretically applied acetylcholine with an IC50 value of 8.0 x 10(-6) mol1(-1). The block was weakly voltage-dependent over the membrane potential range of -50 mV to -90 mV, and appeared to be non-competitive. No difference in potency was observed between the resolved stereoisomers. (+/-)-Vesamicol was found to suppress specific binding of 125I-labelled alpha-bungarotoxin to cockroach nervous tissue with an IC50 value of 5.1 x 10(-3) mol1(-1) and an estimated Hill coefficient of 0.73. Differences in the Hill coefficients were found when the resolved stereoisomers were tested separately. These data provide the first demonstration of a blocking action by vesamicol of a neuronal nicotinic acetylcholine receptor.




© The Company of Biologists Ltd 1993