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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.
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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...

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Hypothyroidism II: Pathophysiology

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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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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...

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Related Experiment Video

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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

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TSH compensates thyroid-specific IGF-I receptor knockout and causes papillary thyroid hyperplasia.

Kathrin Müller¹, Dagmar Führer, Jens Mittag

¹Department of Internal Medicine, University of Leipzig, Germany.

Molecular Endocrinology (Baltimore, Md.)

|October 8, 2011

Summary

Inactivating the Insulin-like Growth Factor I Receptor (IGF-IR) in mice thyroids increased Thyroid Stimulating Hormone (TSH) and caused papillary hyperplasia. TSH fully compensated for IGF-IR loss in thyroid hormone synthesis.

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Area of Science:

Endocrinology
Molecular Biology
Thyroid Research

Background:

Thyroid physiology is primarily stimulated by TSH.
IGF-I receptor (IGF-IR) signaling plays a permissive role in TSH action.
The specific in vivo role of IGF-IR in thyroid function requires further investigation.

Purpose of the Study:

To investigate the in vivo importance of IGF-IR in thyroid physiology.
To understand the impact of targeted Igf1r inactivation on thyroid function and morphology.

Main Methods:

Utilized a Cre-lox system for targeted inactivation of the Igf1r gene in mouse thyroids.
Studied mice with wild-type, heterozygous (Igf1r(+/-)), and homozygous (Igf1r(-/-)) genotypes.
Analyzed thyroid hormone levels, TSH levels, thyroid weight, histology, and gene/protein expression.

Main Results:

Targeted Igf1r inactivation led to transiently reduced thyroid hormones and significantly increased TSH levels.
Histological analysis revealed thyroid hyperplasia, heterogeneous follicle structure, and papillary thyroid architecture in Igf1r-inactivated mice.
Observed increased body weight in male homozygous mice and altered mRNA/protein levels for thyroid peroxidase and IGF-II receptor.

Conclusions:

Elevated TSH levels compensate for the loss of IGF-IR signaling regarding thyroid hormone synthesis.
IGF-IR signaling appears less critical for thyroid hormone synthesis but essential for maintaining thyroid homeostasis and normal morphogenesis.
Thyroid-specific Igf1r inactivation results in papillary hyperplasia, suggesting a role for IGF-IR in regulating thyroid cell proliferation and structure.