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Synthesis and Regulation of Thyroid Hormones01:20

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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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Redox Titration: Iodimetry and Iodometry01:23

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Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...
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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Iodine nutrition optimization: are there risks for thyroid autoimmunity?

R M Ruggeri1,2, F Trimarchi3,4

  • 1Department of Clinical and Experimental Medicine, University of Messina, via Consolare Valeria, 1, 98125, Messina, Italy. rmruggeri@unime.it.

Journal of Endocrinological Investigation
|March 8, 2021
PubMed
Summary
This summary is machine-generated.

Iodine supplementation is safe for thyroid health, even with concerns about autoimmunity. Long-term studies show benefits outweigh risks, with transient antibody increases not leading to significant dysfunction.

Keywords:
HypothyroidismIodineIodine deficiencyIodine supplementationThyroid autoimmunity

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Area of Science:

  • Endocrinology
  • Public Health Nutrition
  • Immunology

Background:

  • Iodine deficiency remains a primary cause of preventable thyroid disorders globally.
  • Salt iodization programs have successfully improved iodine sufficiency in many regions.
  • Concerns exist regarding iodine prophylaxis potentially worsening thyroid autoimmunity.

Purpose of the Study:

  • To evaluate the long-term effects of iodine supplementation on thyroid autoimmunity.
  • To assess the clinical relevance of post-iodization changes in thyroid antibody positivity.
  • To determine the safety and benefits of recommended iodine intake regarding thyroid autoimmunity.

Main Methods:

  • Long-term observational studies on iodine supplementation.
  • Analysis of thyroid antibody prevalence and positivity.
  • Assessment of overt thyroid dysfunction rates over two decades.
  • Evaluation of median iodine concentration in the population.

Main Results:

  • An early increase in thyroid antibody positivity after iodization is transient and not clinically significant.
  • Prevalence of overt thyroid dysfunction remained low over twenty years.
  • Recommended iodine intake is safe, with benefits outweighing risks at iodine levels below 300 μg/L.

Conclusions:

  • Iodine supplementation is safe concerning thyroid autoimmunity.
  • Transient increases in thyroid antibodies do not limit the promotion of iodine supplementation.
  • The benefits of iodine supplementation for thyroid health significantly outweigh potential risks.