Modification of ligand binding to membranes by a soluble acceptor: Alpha-1-acid glycoprotein attenuates 3H-Imipramine binding to cerebral membranes

Abstract

The effect of individual plasma proteins on the binding of 3H-imipramine ( 3H-IMI) was investigated, using rat cerebral membranes as the binding site source. Addition of alpha-1-acid glycoprotein (aAGLP) to an incubation medium containing 4 nm 3H-IMI resulted in a concentration-dependent inhibition of 3H-IMI binding, with an IC 50 value of 0.53 μM. Albumin (0.7 mM) and gamma globulin (3 μM) had no apparent effect. Scatchard analyses of 3H-IMI binding in the presence and absence of 0.5 μm aAGLP revealed that the inhibition of 3H-IMI binding was associated with an increased K d, with no appreciable change in B max. The inhibitory action of platelet-free plasma (PFP) on 3H-IMI binding to cerebral membranes was eliminated after treatment of PFP with specific antibodies to aAGLP. It is suggested that the inhibition of 3H-IMI binding to cerebral membranes by PFP is due, at least partially, to the presence of aAGLP in the plasma. The observed inhibitory effect is consistent with a competition for the ligand between the membrane binding site and the soluble protein acceptor. These findings may explain the serum effect confounding radioreceptor assays of various drugs.