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Review Article
Mechanisms of Disease
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Volume 331:847-853 September 29, 1994 Number 13
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The Molecular Basis of Thyroid Hormone Action
Gregory A. Brent

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Thyroid hormone exerts a broad range of effects on development, growth, and metabolism. The clinical manifestations of thyroid hormone excess and deficiency are dramatic examples of the myriad actions of the hormone. Thyroxine (T4), the primary secretory product of the thyroid, is relatively inactive and is converted to the active hormone, triiodothyronine (T3), by the enzyme thyroxine 5'-deiodinase (Figure 1)1. The actions of thyroid hormone are primarily the result of the interaction of T3 with nuclear receptors for T3 that bind to regulatory regions of genes (thyroid hormone-response elements) and modify their expression3,4. These . . . [Full Text of this Article]

Thyroid Hormone Receptors

Types and Structures of Thyroid Hormone Receptors

Distribution of Receptor Subtypes

Regulation of Receptor Expression by Thyroid Hormone

Thyroid Hormone Action in Specific Tissues

T3 Regulation of Genes Specific for Cardiac and Skeletal Muscle

Regulation of Genes Expressed in Liver and Adipocytes

Regulation of Pituitary Hormone Secretion by T3 and Clinical Implications for T4 Therapy

            Growth Hormone

            Thyrotropin

Resistance to Thyroid Hormone

Summary


Source Information

From the Thyroid Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston.

Address reprint requests to Dr. Brent at the Thyroid Division, Brigham and Women's Hospital, 75 Francis St., Boston, MA 02115.

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