Binding of [ 125I]Bolton Hunter conjugated eledoisin to rat brain cortex membranes - Evidence for two classes of tachykinin receptors in the mammalian central nervous system

Abstract

[ 125I]Bolton Hunter conjugated eledoisin was prepared and purified by ion-paired reverse phase chromatography. The ligand binds to rat brain cortex membranes, and the binding is inhibited over 95% by unlabeled eledoisin (6.6 μ M). The binding site appears to be distinct from the [ 125I]Bolton Hunter conjugated substance P receptor based on the relative potencies of substance P, eledoisin, kassinin, physalaemin and [pGlu]substance P (6–11) hexapeptide to displace the binding of these two ligands.