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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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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.
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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH...
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Related Experiment Video

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Thyroid hormones, t3 and t4, in the brain.

Amy C Schroeder1, Martin L Privalsky1

  • 1Department of Microbiology and Molecular Genetics, College of Biological Sciences, University of California Davis , Davis, CA , USA.

Frontiers in Endocrinology
|April 19, 2014
PubMed
Summary

Thyroid hormones (THs) are vital for brain development and function. New findings suggest thyroxine (T4) may play a more direct role in brain physiology than previously thought, challenging the T4-to-T3 conversion model.

Keywords:
T3 thyronineT4 thyroninebraincoregulatordeiodinase 2thyroid hormone receptor

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Area of Science:

  • Neuroendocrinology
  • Molecular Biology
  • Developmental Neuroscience

Background:

  • Thyroid hormones (THs) are crucial for nervous system development and adult brain function.
  • Thyroxine (T4) is traditionally considered a pro-hormone converted to triiodothyronine (T3) for activity.
  • Thyroid hormone receptors (TRs), particularly TRα1 and TRβ1, mediate TH effects, with TRα1 being dominant in the brain.

Purpose of the Study:

  • To investigate the role of T4 in brain physiology.
  • To re-evaluate the necessity of T4 to T3 conversion for TRα1 activity in the brain.
  • To challenge the established model of TH action in the central nervous system.

Main Methods:

  • Analysis of existing literature on TR isoforms and TH metabolism.
  • Consideration of data from deiodinase-deficient mouse models.
  • Hypothesis generation based on TR isoform expression and responsiveness.

Main Results:

  • TRα1, the predominant brain TR isoform, is responsive to both T4 and T3.
  • Deiodinase-deficient mice show no significant defects in brain development or function.
  • TRα1 exhibits greater responsiveness to T4 compared to TRβ1.

Conclusions:

  • T4 may exert direct effects in the brain, independent of T3 conversion.
  • The classical view of T4 as solely a pro-hormone may be incomplete for brain function.
  • Thyroxine (T4) warrants further investigation for its active role in brain physiology.