Abstract
I. Intracellular recordings were made from identified neurones in the suboesophageal ganglionic mass of the snail, Helix aspersa. 2. Avermectin, MK 936, 0.01-1.0 μM, induced an outward current in certain neurones. The size of this current varied from one cell type to another. This direct effect of Avermectin occurred irrespective of whether the neurones were sensitive to GABA or not and was generally irreversible. 3. Avermectin, 0.1 μM, reduced the chloride mediated inhibitory GABA response and potentiated the largely sodium mediated excitatory GABA response. 4. Avermectin, 0.1 μM, reduced the chloride mediated acetylcholine inhibitory response and potentiated the sodium mediated excitatory acetylcholine response. In neurones which showed a biphasic response to acetylcholine, Avermectin enhanced the excitatory and depressed the inhibitory component. 5. It is concluded that Avermectin can interact with chloride ionophores to induce an outward current and can reduce chloride mediated responses associated with acetylcholine and GABA.
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