PMID: 6970125Oct 1, 1980Paper

Characterization and quantification of the androgen and glucocorticoid receptors in cytosol from rat skeletal muscle

European Journal of Biochemistry
M SnochowskiJ A Gustafsson

Abstract

The binding of the radioactive synthetic hormonal steroids [3H]dexamethasone (9 alpha-fluoro-11 beta, 17 alpha, 21-trihydroxy-16 alpha-methyl-1,4-pregnadiene-3,20-dione) and [3H]methyltrienolone (17 beta-hydroxy-17 alpha-methyl-4,9,11-estratien-3-one) to cytosol from rat skeletal muscle was studied using dextran-coated charcoal to separate unbound and receptor-bound steroid. The rates of association, dissociation, and degradation of the complexes of dexamethasone and methyltrienolone with receptor were highly dependent on temperature. The temperature dependence of association was greater for dexamethasone, and that of degradation was greater for methyltrienolone. Dissociation rates were insignificant for both steroid-receptor complexes compared to association and degradation rates. The apparent equilibrium dissociation constants for the binding of dexamethasone and methyltrienolone to their receptor binding sites were about 7 and 0.3 nM, respectively, regardless of temperature (0. 15 or 23 degrees C). The lack of influence of temperature on the equilibrium constants indicate that the binding was of hydrophobic character, and the corresponding free energy changes upon binding of dexamethasone and methyltrienolone to their respec...Continue Reading

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