Actions of snake neurotoxins on an insect nicotinic cholinergic synapse |
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Authors: | Bernard Hue Steven D Buckingham David Buckingham David B Sattelle |
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Institution: | (1) Laboratoire de Physiologie, Faculté de Médécine, Université d’Angers, 49045 Angers Cedex, France;(2) MRC Functional Genetics Unit, Department of Physiology Anatomy and Genetics, University of Oxford, South Parks Road, Oxford, OX1 3QX, UK |
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Abstract: | Here we examine the actions of six snake neurotoxins (α-cobratoxin from Naja naja siamensis, erabutoxin-a and b from Laticauda semifasciata; CM12 from N. haje annulifera, toxin III 4 from Notechis scutatus and a long toxin from N. haje) on nicotinic acetylcholine receptors in the cercal afferent, giant interneurone 2 synapse of the cockroach, Periplaneta americana. All toxins tested reduced responses to directly-applied ACh as well as EPSPs evoked by electrical stimulation of nerve XI
with similar time courses, suggesting that their action is postsynaptic. Thus, these nicotinic receptors in a well-characterized
insect synapse are senstive to both long and short chain neurotoxins. This considerably expands the range of snake toxins
that block insect nicotinic acetylcholine receptors and may enable further pharmacological distinctions between nAChR subtypes. |
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Keywords: | Snake neurotoxins Nicotinic acetylcholine receptors Insect central nervous system |
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