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Graves Disease II: Pathophysiology

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...

Graves' Disease I: Introduction

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: 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...

Hyperthyroidism I: Introduction

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...

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...

Goiter

Goiter

Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...

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Related Experiment Video

Updated: May 17, 2026

An Ex vivo Culture System to Study Thyroid Development

An Ex vivo Culture System to Study Thyroid Development

Published on: June 6, 2014

Genes that characterize T3-predominant Graves' thyroid tissues.

Chisa Matsumoto¹, Mitsuru Ito, Hiroya Yamada

¹Department of Laboratory Medicine, Osaka University Graduate School of Medicine, D2, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.

European Journal of Endocrinology

|October 31, 2012

Summary

Researchers identified seven key genes associated with T(3)-predominant Graves' disease, offering insights into its molecular mechanisms. These findings may explain the disease's characteristics, including large goiters and high antibody levels.

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Area of Science:

Endocrinology
Molecular Biology
Genetics

Background:

3,5,3'-Triiodothyronine (T3)-predominant Graves' disease presents with thyroid goiter and poor prognosis.
Overexpression of iodothyronine deiodinases (DIO1 and DIO2) is noted, but the disease pathogenesis remains unclear.

Purpose of the Study:

To identify genes characterizing T(3)-predominant Graves' disease tissue.
To elucidate the molecular mechanisms underlying this specific form of Graves' disease.

Main Methods:

DNA microarrays analyzed mRNA from 28,869 genes in thyroid tissues.
Real-time quantitative RT-PCR validated differentially expressed genes in 70 Graves' tissues.

Main Results:

Twenty-three candidate genes were initially identified.
Seven genes (LRRN1, BMP8A, CDH2, PDE1A, CKMT2, ITGB3, PTPN4) were confirmed differentially expressed.
These genes were associated with DIO1 or DIO2 expression levels in Graves' tissues.

Conclusions:

The identified genes correlate with T(3)-predominant Graves' disease features like high anti-TSH receptor antibody titers, elevated free T3/T4 ratios, and large goiter size.
These genes may play a significant role in the pathogenesis of T(3)-predominant Graves' disease.