Anti‐anginal arylalkylamines and sodium channels: [3H]‐batrachotoxinin‐A 20‐α‐benzoate and [3H]‐tetracaine binding

Abstract
1 [3H]-batrachotoxinin-A 20-α-benzoate ([3H]-BTX-B) and [3H]-tetracaine are useful ligands for the study of sodium channels. 2 Inhibition of their binding by various anti-anginal drugs was tested on a rat synaptosomal preparation and on a heart membrane preparation. 3 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. 4 These results suggest that activity of arylalkylamines could be mediated by an interaction on the sodium channel.