Serotonin Binding to Nerve-Ending Particles of the Rat Brain and Its Inhibition by Lysergic Acid Diethylamide

Abstract
The binding of serotonin to nerve-ending particles and other preparations from rat brain has been examined. By investigating the amount bound as a function of serotonin concentration from 10 -7 M to 10 -2 M , it was possible to identify three major components having K assoc (association constant) values of 2 × 10 6 , 5 × 10 4 , and 5 × 10 2 . The component having the highest binding constant was not present in liver and appeared to be confined to the cortex and midbrain regions. This component is inhibited by d -lysergic acid diethylamide at low concentrations. Solubilization of this binding component has been achieved.