Abstract
Copper is an essential element in living organisms and it appears to be involved in estrogen action. This study bears on the manner in which the metal may be linked to the mechanism of this action. Divalent copper was found to induce at 37 degrees C a several fold increase in estradiol binding to the receptors in rat uterine cytosols. An endogenous substance present in the uterine cytosol and separated from it by fractionation on a hydroxylapatite column was found to function as a potent inhibitor of the copper effect. This substance has been found so far also in human breast tissue and in some human breast tumors.
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