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Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
Regulation of Metabolism01:19

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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...

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In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse
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Minireview: cracking the metabolic code for thyroid hormone signaling.

Antonio C Bianco1

  • 1Division of Endocrinology, Diabetes and Metabolism, University of Miami Miller School of Medicine, 1400 North West 10th Avenue, Suite 816, Miami, Florida 33136, USA. abianco@deiodinase.org

Endocrinology
|June 30, 2011
PubMed
Summary

Cells actively regulate thyroid hormone signaling using deiodinase enzymes. Type 2 deiodinase (D2) boosts active T(3) for enhanced signaling, while Type 3 deiodinase (D3) inactivates thyroid hormones, reducing signaling.

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Molecular Biology

Background:

  • Cells actively modulate hormonal signals, not just passively receive them.
  • Thyroid hormone enters cells and is modified by deiodinase enzymes (D2 and D3) during transport to the nucleus.
  • D2 activates prohormone T(4) to T(3), while D3 inactivates T(3) to T(2) or T(4) to reverse T(3).

Purpose of the Study:

  • To elucidate the roles of deiodinase enzymes in cellular thyroid hormone signaling.
  • To understand how D2 and D3 expression impacts cellular responses to thyroid hormone.
  • To explore the regulatory mechanisms and physiological consequences of deiodinase activity.

Main Methods:

  • Analysis of gene expression and protein regulation of Dio2 and Dio3.
  • Investigation of deiodinase activity in cellular models.
  • Examination of cellular responses to thyroid hormone under varying deiodinase expression levels.

Main Results:

  • D2 enhances thyroid hormone signaling by producing active T(3), while D3 reduces signaling by inactivation.
  • Dio2 and Dio3 gene expression is transcriptionally regulated across development and life stages.
  • D2 protein activity is modulated by ubiquitination, and its induction boosts energy expenditure (e.g., in brown adipose tissue).
  • D3 induction in tissues like the heart and brain during hypoxia/ischemia reduces energy expenditure as a protective mechanism.

Conclusions:

  • Deiodinases (D2 and D3) are critical regulators of local thyroid hormone bioavailability and action.
  • Cellular deiodinase activity allows for fine-tuning of thyroid hormone signaling in response to physiological demands.
  • D2 and D3 play distinct, often opposing, roles in energy metabolism and cellular protection under various conditions.