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1 Departments of Physiology and Chemistry, State University of Iowa, Iowa City
Several substances have been tested for thyroxine-inhibiting action using the following criteria: (1) lowering the BMR of normal rats, (2) lowering the thyroxine-elevated BMR of thyroidectomized rats, (3) reversal of thyroxine depression of estrogen responsiveness.
Among the compounds showing some ability to overcome thyroxine effects were: Iodinated phenoxyacetic acids, 4-hydroxy- and 4-benzyloxy-3,5-diiodobenzoic acids and N-(4'-hydroxy-3',5'-diiodobenzoyl)-3,5-diiodotyrosine. In contrast, 3,5-diiodo-L-tyrosine and 3,5-dibromo-L-tyrosine showed no activity.
Submitted on February 28, 1950