Neuronal Acetylcholine Receptor Channels from Insects: a Comparative Electrophysiological Study
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Physiology
Social Sciences
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The channel properties of nicotinic acetylcholine receptor subtypes in the nervous system of insects (Locusta migratoria) have been characterized. Single channel measurements were performed using patch-clamp techniques as well as planar lipid bilayer reconstitution approaches. In reconstitution experiments using receptor-preparations isolated from neuronal membranes by alpha-toxin affinity chromatography, a ligand-gated channel type was found, which showed a high conductance and a short mean lifetime. Patch-clamp experiments on synapse-free somata of isolated nerve cells revealed an acetylcholine-gated channel type with a lower conductance but a longer lifetime. The two different agonist-activated channel types are supposed to represent synaptic and extrasynaptic acetylcholine receptors.
Cholinergic calcium responses in cultured antennal lobe neurons of the migratory locust.
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