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Related Concept Videos

Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

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

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Related Experiment Video

Updated: Jul 2, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Immune mechanisms in thyroid eye disease.

Geniece M Lehmann1, Steven E Feldon, Terry J Smith

  • 1Department of Environmental Medicine, University of Rochester, Rochester, New York 14642, USA.

Thyroid : Official Journal of the American Thyroid Association
|August 30, 2008
PubMed
Summary

Thyroid eye disease (TED) involves orbital inflammation and tissue remodeling, leading to exophthalmos. Understanding T cell and fibroblast communication offers new therapeutic targets to reverse these pathological changes.

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Last Updated: Jul 2, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Published on: March 17, 2023

A Chronic Autoimmune Dry Eye Rat Model with Increase in Effector Memory T Cells in Eyeball Tissue
09:42

A Chronic Autoimmune Dry Eye Rat Model with Increase in Effector Memory T Cells in Eyeball Tissue

Published on: June 7, 2017

Area of Science:

  • Ophthalmology
  • Immunology
  • Endocrinology

Background:

  • Thyroid eye disease (TED) is an inflammatory orbital condition linked to Graves' disease.
  • Pathological alterations include fibrosis, extracellular matrix accumulation, and fat deposition, causing exophthalmos.
  • Current treatments offer symptomatic relief, but therapies to prevent or reverse TED's orbital remodeling are needed.

Purpose of the Study:

  • To investigate the intercellular communication mechanisms between autoreactive T cells and orbital fibroblasts in TED.
  • To identify potential therapeutic targets for preventing or reversing orbital tissue remodeling in TED.

Main Methods:

  • The study focuses on recent findings regarding T cell-fibroblast interactions.
  • It examines the role of autoantibodies in activating orbital fibroblasts.
  • The research explores the signaling pathways initiated by these interactions.

Main Results:

  • Intercellular communication between T cells and orbital fibroblasts is crucial in TED pathogenesis.
  • Activated orbital fibroblasts release chemoattractants, promoting T cell interaction.
  • These interactions lead to fibroblast proliferation and differentiation into myofibroblasts and lipofibroblasts.

Conclusions:

  • Understanding T cell-fibroblast signaling is key to developing novel TED treatments.
  • Targeting this communication may prevent or reverse the pathological remodeling of orbital tissues.
  • Existing therapies might be repurposed to interrupt these crucial intercellular signaling pathways.