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Many synthetic chemicals have been identified as environmental contaminants with activity to disrupt normal function of the thyroid hormone system. Thyroid hormones play important roles in growth, development, differentiation, and basal metabolic homeostasis, as well as in brain development in human fetus and children, and thyroid dysfunction can have very serious consequences, including mental retardation. Environmental chemicals may affect thyroid hormone action in multiple ways, including reduced thyroid hormone synthesis owing to direct toxicity at the thyroid gland, interaction with thyroid hormone receptors and transporters such as transthyretin, and disturbance of thyroid hormone metabolism (e.g., glucuronidation, sulfation and deiodination). In addition, iodotyrosine deiodinase, which is involved in iodide salvage by catalyzing deiodination of iodinated by-products of thyroid hormone production, was recently identified as a possible new target for disruption of thyroid hormone homeostasis by environmental halogenated chemicals. This topic, after briefly summarizing findings on the thyroid hormone-disrupting action of environmental chemicals in mammals, focuses on the effects of environmental halogenated chemicals on iodotyrosine deiodinase activity.

Iodotyrosine Deiodinase, a Novel Target of Environmental Halogenated Chemicals for Disruption of the Thyroid Hormone System in Mammals