[3H]‐tetracaine binding on rat synaptosomes and sodium channels

Abstract
1 [3H]-tetracaine binding was studied in a rat synaptosomal preparation. [3H]-tetracaine bound to a single class of binding sites with a mean KD of 188 ± 28 nM and a mean maximal binding capacity of 13 ± 0.7 pmol mg−1 protein. 2 [3H]-tetracaine binding was inhibited by tetracaine, procaine and by β-adrenoceptor blocking agents which possess local anaesthetic properties. 3 [3H]-tetracaine binding was not modified by neurotoxins interacting specifically with the sodium channels.