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Estrogen receptor in rat thymus cytosol


, : Estrogen receptor in rat thymus cytosol. Tokai Journal of Experimental and Clinical Medicine 5(3): 263-267

Estrogen binding components were characterized in cytosol fractions from the lymphatic tissues of castrated rats. Sucrose gradient analysis revealed specific binding of [3H] estrogen in the thymus. The binding was highly specific since it was easily displaced by unlabeled estrogen, but not by the nonestrogenic steroids [progesterone, corticosterone and testosterone] used. In thymus cytosols from both males and females, the equilibrium dissociation constant of estrogen binding was -0.3 nM and the saturation binding was 6 f[femto] mol/mg of protein. Enzyme- and heat-experiments demonstrated a specific estrogen binder in thymic cytosol which was heat-labile and protein in nature. The rat thymus evidently contains an estrogen receptor which is in part protein and heat-labile.

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PMID: 7222118


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