Citations to this article

Increased sensitivity of the thyroid in iodine-depleted rats to the goitrogenic effects of thyrotropin
George A. Bray
George A. Bray
Published July 1, 1968
Citation Information: J Clin Invest. 1968;47(7):1640-1647. https://doi.org/10.1172/JCI105855.
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Research Article

Increased sensitivity of the thyroid in iodine-depleted rats to the goitrogenic effects of thyrotropin

Abstract

The present studies demonstrate that iodine depletion increases the sensitivity of the thyroid to the goitrogenic effects of thyrotropin. Iodine depletion was induced by feeding rats a low iodine diet containing propylthiouracil for 10-14 days before hypophysectomy. Accumulation of iodine in the thyroid after hypophysectomy was prevented by continuing the antithyroid drugs in the diet. Doses of thyrotropin as low as 3 mU/100 g of body weight per day produced significant thyroid enlargement in 3-7 days in iodine-depleted rats. Adding propylthiouracil or perchlorate to the diet during treatment with thyrotropin did not reduce or augment the goitrogenic response to thyrotropin in iodine-depleted rats. Increasing the level of circulating iodide also did not reduce the goitrogenic response to thyrotropin. The increased sensitivity of the iodine-depleted thyroid gland may provide an explanation for the development of thyroid enlargement without requiring an increased level of circulating thyrotropin.

Authors

George A. Bray

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