Cortisol-binding components of cytosol receptor in normal and adrenalectomized rat liver

Abstract

[3H] cortisol was found to be bound to two distinct components of receptor protein in hepatic cytosol of both normal and adrenalectomized adult male rats. In liver cytosol of normal rats, 78% of total bound [3H] cortisol to receptor was associated with the first receptor component, and about 20% to the second one. However, the first component of cytosol receptor in adrenalectomized rats was found to bind 95% of total [3H] cortisol bound to both receptor components, while only 4.5% of the bound hormone was found associated with the second receptor component. These alterations in binding capacity are discussed in relation to possible regulation of nuclear RNA synthesis by cortisol-receptor complexes.