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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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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 II: Pathophysiology01:27

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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...
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Development of the Heart01:27

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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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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...
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Author Spotlight: In Vivo Assessment of Thyroid Hormone Disruption Using the THAI Mouse Model
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Thyroid hormone action in postnatal heart development.

Ming Li1, Siiri E Iismaa2, Nawazish Naqvi3

  • 1Victor Chang Cardiac Research Institute, Darlinghurst, NSW 2010, Australia.

Stem Cell Research
|August 5, 2014
PubMed
Summary
This summary is machine-generated.

Thyroid hormone stimulates cardiomyocyte proliferation for postnatal cardiac development. Altered thyroid hormone metabolism in disease impairs heart function, but T3 therapy may improve contractility.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Developmental Biology

Background:

  • Thyroid hormone is essential for fetal and postnatal cardiac growth.
  • Recent findings highlight its role in stimulating cardiomyocyte proliferation during preadolescence.
  • Thyroid hormone metabolism is disrupted in chronic diseases like heart failure, leading to low T3 syndrome.

Purpose of the Study:

  • To review the role of thyroid hormone in postnatal cardiac development.
  • To explore the impact of altered thyroid hormone metabolism on cardiovascular function.
  • To consider therapeutic strategies involving thyroid hormone analogs for cardiac conditions.

Main Methods:

  • Review of existing literature on thyroid hormone and cardiac development.
  • Analysis of studies on cardiomyocyte proliferation in response to thyroid hormone.
  • Examination of clinical data regarding thyroid hormone levels in heart disease.

Main Results:

  • Thyroid hormone drives a significant burst of cardiomyocyte proliferation in the murine heart during preadolescence.
  • Low T3 syndrome, associated with chronic diseases, impairs cardiovascular function and prognosis.
  • Thyroid hormone analogs show potential in improving cardiac contractility, though mechanisms are unclear.

Conclusions:

  • Thyroid hormone plays a crucial role in postnatal cardiac development through cardiomyocyte proliferation.
  • Dysregulation of thyroid hormone metabolism in disease negatively impacts cardiac function.
  • Further research into T3's mitogenic potential for cardiomyocytes is warranted for therapeutic development.