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Hypothalamus-Pituitary-Thyroid Axis.

Tania M Ortiga-Carvalho1, Maria I Chiamolera2, Carmen C Pazos-Moura1

  • 1Institute of Biophysics Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, UFRJ, Rio de Janeiro, Brazil.

Comprehensive Physiology
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Summary
This summary is machine-generated.

The hypothalamus-pituitary-thyroid (HPT) axis regulates thyroid hormone (TH) levels through a feedback loop involving thyrotropin-releasing hormone (TRH) and thyroid-stimulating hormone (TSH). Cellular TH action depends on the conversion of thyroxine (T4) to triiodothyronine (T3) by deiodinase enzymes.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Physiology

Background:

  • The hypothalamus-pituitary-thyroid (HPT) axis is a critical neuroendocrine system regulating thyroid hormone (TH) production.
  • Thyroid hormones (THs), thyroxine (T4) and triiodothyronine (T3), are essential for development, metabolism, and cardiovascular function.
  • The HPT axis maintains hormonal balance via negative feedback involving thyrotropin-releasing hormone (TRH) and thyroid-stimulating hormone (TSH).

Purpose of the Study:

  • To elucidate the regulatory mechanisms of the HPT axis and thyroid hormone action.
  • To detail the roles of deiodinase enzymes and transporters in cellular thyroid hormone availability.
  • To explain how alterations in the HPT axis impact physiological functions.

Main Methods:

  • Review of existing literature on the HPT axis, thyroid hormone metabolism, and action.
  • Analysis of the molecular mechanisms involving nuclear thyroid hormone receptors (THR).
  • Examination of the enzymatic conversion of T4 to T3 and reverse T3 by deiodinases (D1, D2, D3).

Main Results:

  • The HPT axis maintains physiological TH levels through a feedback loop involving TRH and TSH.
  • Thyroid hormone actions are primarily mediated by nuclear receptors (THR), with T3 being the preferred ligand.
  • Cellular T3 availability is tightly regulated by the activity of 5'-deiodinases (D1, D2) and deactivating 5-deiodinase (D3), as well as TH transporters.

Conclusions:

  • The HPT axis is a complex system with intricate feedback mechanisms essential for homeostasis.
  • Intracellular conversion of T4 to T3 by deiodinases is crucial for thyroid hormone action.
  • Dysregulation of the HPT axis or deiodinase activity can lead to significant physiological alterations.