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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...

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...

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...

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Decrease of intrathyroidal CD161+Valpha24+Vbeta11+ NKT cells in Graves' disease.

Mikio Watanabe¹, Yukiyo Nakamura, Fumio Matsuzuka

¹Department of Biomedical Informatics, Division of Health Science, Osaka University Graduate School of Medicine, Suita, Japan.

Endocrine Journal

|February 6, 2008

Summary

This summary is machine-generated.

Natural killer T (NKT) cells help prevent autoimmunity in Graves' disease (GD). Researchers found fewer NKT cells in the thyroids of GD patients, suggesting this may impair the regulation of autoimmune responses.

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Area of Science:

Immunology
Endocrinology

Background:

Graves' disease (GD) is an autoimmune disorder affecting the thyroid gland.
Natural killer T (NKT) cells are immune cells known to play a role in regulating autoimmune responses.
A potential deficiency in intrathyroidal NKT cells may contribute to the pathogenesis of GD.

Purpose of the Study:

To investigate the proportion and distribution of intrathyroidal and peripheral natural killer T (NKT) cells in patients with Graves' disease.
To determine if a decrease in intrathyroidal NKT cells is associated with Graves' disease.

Main Methods:

Three-color flow cytometry was used to analyze lymphocytes.
Intrathyroidal lymphocytes were obtained from 11 patients with GD.
Peripheral lymphocytes were obtained from 11 GD patients and 9 healthy volunteers.

Main Results:

The proportion of T cell receptor Valpha24(+) Vbeta11(+) CD161(+) cells, representing the NKT cell subset, was significantly lower in the thyroid tissue of GD patients compared to their peripheral blood.
NKT cell levels in the peripheral blood of GD patients were comparable to those of healthy subjects.
A reduced proportion of intrathyroidal NKT cells was observed in patients with Graves' disease.

Conclusions:

The study indicates a decreased proportion of intrathyroidal NKT cells in patients with Graves' disease.
This reduction in intrathyroidal NKT cells may contribute to the incomplete regulation of autoreactive T cells observed in GD.
Further research into NKT cell function could offer new therapeutic strategies for Graves' disease.