Adrenergic ligand liposolubility in membranes. Direct assessment in a beta-adrenergic binding system.

The binding of [3H]dihydroalprenolol to adipocyte membranes may be displaced not only from beta-adrenergic receptors but also nonstereospecifically from other membrane compartments by beta-adrenergic and other adrenergic agents. The EC50 of this nonstereospecific displaceable binding is directly related to the liposolubility (n-octanol:water partition coefficient) of the displacing ligand.