Abstract
[3H]-batrachotoxinin-A 20-alpha-benzoate ([3H]-BTX-B) and [3H]-tetracaine are useful ligands for the study of sodium channels. Inhibition of their binding by various anti-anginal drugs was tested on a rat synaptosomal preparation and on a heart membrane preparation. Diphenylalkylamines and structurally related drugs inhibited [3H]-BTX-B binding in both the synaptosomal preparation and heart membrane preparation. They were almost inactive on [3H]-tetracaine binding. These results suggest that activity of arylalkylamines could be mediated by an interaction on the sodium channel.
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