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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...
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...
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...
Autoimmune Disorders01:29

Autoimmune Disorders

Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune system...

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Related Experiment Video

Updated: Jun 24, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

TSH receptor autoantibodies.

Krzysztof Michalek1, Syed A Morshed, Rauf Latif

  • 1Thyroid Research Unit, Mount Sinai School of Medicine, James J. Peters VA Medical Center, New York, NY 10468, USA.

Autoimmunity Reviews
|April 1, 2009
PubMed
Summary
This summary is machine-generated.

Thyrotropin receptor autoantibodies (TSHR-Abs) cause Graves' disease and hyperthyroidism. New research shows stimulating and blocking TSHR-Abs bind conformationally, while neutral ones bind linearly, suggesting a need for updated classification.

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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Published on: May 29, 2020

Area of Science:

  • Endocrinology
  • Immunology
  • Molecular Biology

Background:

  • Thyrotropin receptor autoantibodies (TSHR-Abs) are key indicators of Graves' disease, leading to hyperthyroidism and extrathyroidal manifestations.
  • Monoclonal antibodies have enabled detailed characterization of TSHR-Abs, including stimulating, blocking, and neutral types.

Purpose of the Study:

  • To further characterize TSHR-Abs by investigating their binding epitopes.
  • To understand the molecular basis for the diverse biological actions of TSHR-Abs.
  • To assess the need for a revised classification of TSHR-Abs based on new findings.

Main Methods:

  • Generation and utilization of monoclonal TSHR-Abs.
  • Analysis of antibody binding epitopes (conformational vs. linear).
  • Investigation of TSHR-Abs signaling pathways, including non-classical signaling.

Main Results:

  • Stimulating and blocking TSHR-Abs primarily bind to conformational epitopes on the thyrotropin receptor.
  • Neutral TSHR-Abs exclusively bind to linear peptides of the receptor.
  • Subtle epitope differences influence the biological actions of stimulating and blocking antibodies.
  • Non-classical signaling pathways activated by neutral antibodies have been identified.

Conclusions:

  • The binding epitope (conformational vs. linear) is a key differentiator between TSHR-Ab subtypes.
  • Distinct epitope interactions explain the varied biological effects of TSHR-Abs.
  • The discovery of non-classical signaling necessitates a re-evaluation and potential revision of the current TSHR-Ab classification system.