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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...
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...
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...
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...

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Related Experiment Video

Updated: Jul 18, 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

[Thyroid hormones and lipid metabolism].

Shigekazu Sasaki1, Kotaro Kawai, Yumiko Honjo

  • 1Second Division of Internal Medicine, Hamamatsu University School of Medicine.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|December 13, 2006
PubMed
Summary

Thyroid hormone receptor (TR) targeting with GC1 effectively lowers cholesterol by activating liver TRbeta1, surpassing atorvastatin. Future research aims to address GC1

Area of Science:

  • Endocrinology and Metabolism
  • Molecular Biology
  • Pharmacology

Context:

  • Thyroid hormone (T3) significantly impacts lipid metabolism; hypothyroidism leads to hypercholesterolemia, marked by elevated low-density lipoproteins (LDL).
  • Multiple thyroid hormone receptor (TR) isoforms (TRalpha1, TRbeta1, TRbeta2) exhibit tissue-specific expression, with TRbeta1 predominant in the liver and TRalpha1 in the heart.
  • Understanding TR function and interactions with other nuclear receptors (PPARs, LXRs, FXRs) is crucial for managing lipid disorders.

Purpose:

  • To investigate the therapeutic potential of TRbeta isoform-specific T3 analogues, exemplified by GC1, for treating hypercholesterolemia.
  • To evaluate the efficacy of GC1 in lowering cholesterol levels and its mechanism of action, particularly its selective targeting of TRbeta1 in the liver.
  • To identify challenges and future directions for TR-targeted therapies, such as addressing serum TSH reduction.

Related Experiment Videos

Last Updated: Jul 18, 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

Summary:

  • GC1, a TRbeta-selective analogue, demonstrates potent cholesterol-lowering effects by targeting TRbeta1 in the liver, outperforming atorvastatin without causing tachycardia.
  • The study highlights the complex interplay between TRs and other nuclear receptors (PPARs, LXRs, FXRs) in regulating lipid metabolism.
  • While GC1 shows promise, overcoming the reduction in serum TSH remains a key area for future therapeutic development.

Impact:

  • GC1 represents a novel therapeutic strategy for hypercholesterolemia, offering a potentially more effective and targeted approach than current treatments.
  • This research deepens the understanding of TR signaling pathways in lipid homeostasis.
  • Insights gained may pave the way for new pharmacological interventions for dyslipidemia by modulating nuclear hormone receptor interactions.