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Synthesis and Regulation of Thyroid Hormones01:20

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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.
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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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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
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An Ex vivo Culture System to Study Thyroid Development
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Thyroid hormone biosynthesis and release.

Denise P Carvalho1, Corinne Dupuy2

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

Molecular and Cellular Endocrinology
|February 4, 2017
PubMed
Summary
This summary is machine-generated.

Thyroid hormone synthesis involves iodide uptake by thyrocytes and its incorporation into thyroglobulin. This process, crucial for thyroid function, is regulated by thyrotropin and involves novel molecules.

Keywords:
Anoctamin-1ClC5DUOXNISPendrinTPOThyroglobulin

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Area of Science:

  • Biochemistry
  • Endocrinology
  • Molecular Biology

Background:

  • Thyroid hormones (T4 and T3) are essential regulators of metabolism.
  • Their synthesis occurs within thyroid follicles, involving iodide and thyroglobulin (TG).

Purpose of the Study:

  • To elucidate the biochemical pathways of thyroid hormone (TH) biosynthesis and release.
  • To highlight novel molecules implicated in these processes.

Main Methods:

  • Review of biochemical mechanisms of thyroid hormone synthesis.
  • Discussion of the roles of iodide, thyroglobulin, hydrogen peroxide, and thyroid peroxidase (TPO).

Main Results:

  • Iodide uptake via the sodium/iodide symporter (NIS) is critical.
  • Iodination of TG at the apical membrane, involving TPO and H2O2, precedes TH formation.
  • Thyroid hormone biosynthesis is regulated by thyrotropin (TSH).

Conclusions:

  • Thyroid hormone synthesis is a complex process dependent on iodide, TG, and TPO.
  • Efficient iodide recycling is vital for normal thyroid function.
  • Novel molecules are emerging as important players in TH biosynthesis and release.