Immobilization stress effect on thyroid hormone secretion

Analysis of blood flowing from the rat thyroid has shown that an acute immobilization stress enhanced thyroid hormone secretion with an increase of the T3/T4-100 index. The most marked response to stress was observed after repeated 2 min immobilization with a 3 min interval: Such increase of secretion was arrested by injection of prasosin, an -adrenoblocker. Propylthiouracil injected an hour before the experiment reduced T4 thyroid conversion index. These results permit a conclusion that short-term repeated immobilization enhanced thyroid hormone secretion via -adrenergic system stimulation, this being paralleled by increased production of hormonally more active T3.

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