Identification of D-2 dopaminergic receptors in bovine adrenal cortex

Dopamine receptors in bovine adrenal cortex have been studied by using 3H-(-)sulpiride as selective ligand. The specific binding is saturable and the Scatchard analysis reveals a single component with a Kd of 6.2 nM and a Bmax of 8 fmoles/mg protein. The characterization indicates that the binding is rapid, reversible, stereospecific, Na+ - and temperature- dependent. Moreover its pharmacological profile is superimposable to that of D-2 receptors in the striatum, thus suggesting that central and peripheral D-2 receptors are identical.