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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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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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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
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Association of Iodine and Iron with Thyroid Function.

Juhua Luo1, Michael Hendryx2, Paul Dinh3

  • 1Department of Epidemiology and Biostatistics, School of Public Health, Indiana University, Bloomington, IN, USA. juhluo@indiana.edu.

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Thyroid health depends on iron and iodine. This study found that low iron or abnormal iodine levels, particularly high iodine in females, can disrupt thyroid function, with complex, sex-specific relationships observed.

Keywords:
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Area of Science:

  • Endocrinology
  • Nutritional Science
  • Public Health

Background:

  • Iodine and iron are crucial for thyroid hormone production.
  • The interplay between iron, iodine, and thyroid function in the US population remains understudied.

Purpose of the Study:

  • To investigate the association between iron and iodine status and thyroid hormone levels in US adults.
  • To explore potential sex-specific differences in these relationships.

Main Methods:

  • Analysis of data from 7672 US adults (2007-2012 NHANES).
  • Measurement of serum thyroid hormones (T3, T4, TSH), serum iron, and urinary iodine.
  • Application of multivariate and logistic regression models to assess associations.

Main Results:

  • 10.9% had low iron; 32.2% low iodine, 18.8% high iodine.
  • Normal iron with high iodine linked to lower free T3 and higher TSH risk.
  • Low iron and low iodine associated with reduced free T3 and increased TSH.
  • High iodine increased abnormal high TSH risk in females, not males.

Conclusions:

  • Thyroid function can be negatively impacted by suboptimal iron or abnormal iodine levels.
  • The interactions between iron, iodine, and thyroid function are complex and exhibit sex-specific patterns.
  • Further research, including prospective studies, is necessary to elucidate the underlying mechanisms.