The mechanisms by which thyroid hormone accelerates energy expenditure are poorly understood. In the brown adipose tissue (BAT), activation of thyroid hormone by type 2 iodothyronine deiodinase (D2) has been known to play a role in adaptive energy expenditure during cold exposure in human newborns and other small mammals. Although BAT is not present in significant amounts in normal adult humans, recent studies have found substantial amounts of D2 in skeletal muscle, a metabolically relevant tissue in humans. This article reviews current biological knowledge about D2 and adaptive T3 production and their roles in energy expenditure.
Adaptive Activation of Thyroid Hormone and Energy Expenditure
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Antonio C. Bianco, Ana Luiza Maia, Wagner Seixas da Silva, Marcelo A. Christoffolete; Adaptive Activation of Thyroid Hormone and Energy Expenditure. Biosci Rep 8 June 2005; 25 (3-4): 191–208. doi: https://doi.org/10.1007/s10540-005-2885-6
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