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Related Concept Videos

Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

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...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
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...
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

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...
Functions of Thyroid Hormones01:18

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.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...

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Related Experiment Video

Updated: May 11, 2026

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse
04:14

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse

Published on: October 6, 2023

Fetuin-A levels in hyperthyroidism.

Bariş Onder Pamuk1, Hamiyet Yilmaz, Tugba Topcuoglu

  • 1Department of Endocrinology and Metabolism, Izmir Bozyaka Teaching and Research Hospital, Izmir, Turkey. bopamuk@gmail.com

Clinics (Sao Paulo, Brazil)
|May 7, 2013
PubMed
Summary
This summary is machine-generated.

Hyperthyroidism significantly impacts fetuin-A levels, a protein linked to insulin resistance. Treating hyperthyroidism normalized fetuin-A and improved insulin resistance markers in patients.

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A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function

Published on: October 6, 2023

Area of Science:

  • Endocrinology
  • Metabolic Syndrome
  • Cardiovascular Health

Background:

  • Fetuin-A, a liver-secreted protein, inhibits arterial calcification and is implicated in insulin resistance.
  • Hyperthyroidism is independently associated with insulin resistance.
  • The relationship between hyperthyroidism and fetuin-A levels remains uncharacterized.

Purpose of the Study:

  • To investigate the effect of hyperthyroidism on fetuin-A levels.
  • To assess changes in fetuin-A and insulin resistance markers following treatment for hyperthyroidism.

Main Methods:

  • Fetuin-A and homeostasis model of assessment-insulin resistance (HOMA-IR) were measured in 42 hyperthyroid patients before and after achieving euthyroidism.
  • Additional markers including insulin, high-sensitivity C-reactive protein, fasting blood glucose, free T3 (fT3), free T4 (fT4), and thyrotropin were also assessed.

Main Results:

  • Euthyroidism was associated with significant reductions in fasting blood glucose, hs-CRP, insulin, c-peptide, HOMA-IR, fT3, fT4, and fetuin-A.
  • Basal fetuin-A levels positively correlated with fasting blood glucose, hs-CRP, insulin, HOMA-IR, fT3, and fT4.
  • Basal thyrotropin levels showed a significant negative correlation with basal fetuin-A levels.

Conclusions:

  • Hyperthyroidism significantly influences fetuin-A levels.
  • Normalization of thyroid hormone levels leads to decreased fetuin-A and improved insulin resistance parameters.
  • Fetuin-A may serve as a potential biomarker in hyperthyroid-associated metabolic disturbances.