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Related Concept Videos

Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
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Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...
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Functions of Thyroid Hormones

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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Goiter01:27

Goiter

Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...
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Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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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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Related Experiment Video

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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Interaction between cigarette smoking and iodine intake and their impact on thyroid function.

Nam H Cho1, Hoon Sung Choi, Kyung Won Kim

  • 1Department of Preventive Medicine, Ajou University School of Medicine & Hospital, Suwon, Korea.

Clinical Endocrinology
|January 29, 2010
PubMed
Summary
This summary is machine-generated.

Smoking appears to lower the risk of subclinical hypothyroidism (SCH) in iodine-sufficient populations. This effect was particularly noted through a negative interaction with iodine intake.

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Area of Science:

  • Endocrinology
  • Public Health
  • Epidemiology

Background:

  • Population-based studies on smoking and thyroid function are common in iodine-deficient regions.
  • Limited research exists on smoking's impact on thyroid function in iodine-sufficient areas.
  • Korea, an iodine-sufficient region, provides a unique setting to study this relationship.

Purpose of the Study:

  • To investigate the effect of smoking on thyroid function.
  • To examine the association between smoking, iodine intake, and thyroid function in an iodine-sufficient population.
  • To determine the prevalence of subclinical hypothyroidism (SCH) and its risk factors in relation to smoking.

Main Methods:

  • A population-based cohort of 3399 subjects with available thyroid function data was analyzed.
  • Thyroid function tests, smoking status questionnaires, and dietary intake assessments were conducted.
  • Multivariate analysis was used to identify independent risk factors for SCH.

Main Results:

  • Subclinical hypothyroidism (SCH) was present in 11.7% of subjects.
  • In females, older age, positive anti-TPO antibody status, and iodine intake were risk factors for SCH.
  • Current smoking was inversely associated with SCH and showed a negative interaction with iodine intake.

Conclusions:

  • Cigarette smoking is associated with a reduced prevalence of SCH.
  • The inverse relationship between smoking and SCH is influenced by iodine intake.
  • Smoking may offer a protective effect against SCH in iodine-sufficient environments.