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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.
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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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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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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...
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Graves Disease II: Pathophysiology01:24

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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,...
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Goiter01:27

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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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Thyrocyte-specific Gq/G11 deficiency impairs thyroid function and prevents goiter development.

Jukka Kero1, Kashan Ahmed, Nina Wettschureck

  • 1Institute of Pharmacology, University of Heidelberg, Heidelberg, Germany.

The Journal of Clinical Investigation
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Summary
This summary is machine-generated.

Thyroid hormone regulation involves Gq/G11 signaling, not just Gs. Blocking this pathway impacts thyroid function and growth, offering new therapeutic targets for thyroid disorders.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Cell Signaling

Background:

  • Thyroid-stimulating hormone (TSH) regulates adult thyroid function via its receptor, a G protein-coupled receptor.
  • The Gs-mediated cAMP pathway was considered the primary signaling mechanism for TSH action.
  • Overactivation of the TSH receptor leads to hyperthyroidism and goiter.

Purpose of the Study:

  • To investigate the role of the Gq/G11 signaling pathway in thyroid function regulation.
  • To determine the impact of Gq/G11 deficiency in thyroid epithelial cells on thyroid hormone secretion and gland growth.

Main Methods:

  • Generation of mice with specific deficiency of Gq and G11 alpha subunits in thyroid epithelial cells.
  • Assessment of iodine organification, thyroid hormone secretion, and thyroid gland response to TSH and goitrogenic diet.
  • Analysis of hypothyroidism and thyroid proliferative response in genetically modified mice.

Main Results:

  • Thyroid-specific Galphaq/Galpha11-deficient mice exhibited significantly reduced iodine organification and thyroid hormone secretion upon TSH stimulation.
  • A substantial proportion of these mice developed hypothyroidism postnatally.
  • These mice also showed a lack of normal thyroid proliferative response to TSH or goitrogenic stimuli, highlighting the pathway's role in adaptive growth.

Conclusions:

  • The Gq/G11-mediated signaling pathway plays a critical and previously unrecognized role in thyroid hormone regulation and thyroid gland growth.
  • Thyroid epithelial cell Gq/G11 signaling is essential for normal thyroid function and adaptive thyroid enlargement.
  • Gq/G11 and their downstream effectors represent potential therapeutic targets for modulating thyroid function and growth in related disorders.