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Hypothyroidism II: Pathophysiology

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 Hormones

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...

The Thyroid Gland

The Thyroid Gland

The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...

Hyperthyroidism I: Introduction

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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...

Hyperthyroidism II: Pathophysiology

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: Pathophysiology

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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...

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Related Experiment Video

Updated: Jun 26, 2026

An Ex vivo Culture System to Study Thyroid Development

An Ex vivo Culture System to Study Thyroid Development

Published on: June 6, 2014

Two puzzling cases of thyroid dysgenesis.

P Kuehnen¹, A Grueters, H Krude

¹Institute of Experimental Paediatric Endocrinology, Charité, Berlin, Germany.

Hormone Research

|January 21, 2009

Summary

Thyroid dysgenesis, a cause of congenital hypothyroidism, remains poorly understood. Epigenetic differences in identical twins may explain why one develops the condition and the other does not.

Area of Science:

Developmental Biology
Endocrinology
Genetics

Background:

Congenital hypothyroidism due to thyroid dysgenesis is a significant concern.
Key genes like NKX2.1, FOXE1, and PAX8 are implicated in embryonic thyroid development.
The underlying causes of most thyroid dysgenesis cases are unknown, and genetic factors alone are unlikely given twin discordance.

Observation:

Two pairs of monozygotic (identical) twins with discordant thyroid dysgenesis were studied.
This discordance challenges traditional genetic explanations for the condition.

Findings:

While genetic mutations are known, the pathophysiology of sporadic thyroid dysgenesis is not fully elucidated.
Monzygotic twins, sharing identical DNA, exhibited differing thyroid development, suggesting non-genetic factors.

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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

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Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions

Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions

Published on: February 9, 2024

Related Experiment Videos

Last Updated: Jun 26, 2026

An Ex vivo Culture System to Study Thyroid Development

An Ex vivo Culture System to Study Thyroid Development

Published on: June 6, 2014

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions

Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions

Published on: February 9, 2024

Implications:

Investigating epigenetic variations in discordant identical twins is vital.
Understanding these epigenetic differences could unlock the pathogenesis of thyroid dysgenesis.
This research may lead to novel diagnostic and therapeutic strategies for congenital hypothyroidism.