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Related Concept Videos

Graves' Disease I: Introduction01:28

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: Pathophysiology01:27

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...
Graves Disease II: Pathophysiology01:24

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...
Synthesis and Regulation of Thyroid Hormones01:20

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...
Hypothyroidism II: Pathophysiology01:23

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...
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.

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Related Experiment Videos

Cardiac arrhythmia and thyroid dysfunction: a novel genetic link.

Kerry Purtell1, Torsten K Roepke, Geoffrey W Abbott

  • 1Department of Pharmacology, Weill Medical College of Cornell University, New York, NY 10021, USA.

The International Journal of Biochemistry & Cell Biology
|August 7, 2010
PubMed
Summary

Mutations in KCNQ1 and KCNE genes cause Long QT Syndrome (LQTS), a dangerous heart rhythm disorder. This review explores a new genetic link between cardiac and thyroid function, impacting future disease treatments.

Related Experiment Videos

Area of Science:

  • Cardiology
  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Inherited Long QT Syndrome (LQTS) is a cardiac arrhythmia linked to mutations in KCNQ1 and KCNE genes.
  • These mutations affect potassium channels crucial for normal heart rhythm and are also associated with atrial fibrillation.
  • Thyroid status significantly influences cardiac function, with dysfunction leading to abnormal heart rhythm.

Purpose of the Study:

  • To review the novel genetic link between cardiac and thyroid physiology and pathology.
  • To explore the role of KCNQ1 and KCNE2 in thyroid hormone biosynthesis.
  • To discuss potential therapeutic strategies for cardiac and thyroid diseases based on this link.

Main Methods:

  • Literature review of genetic mutations associated with LQTS and atrial fibrillation.
  • Examination of the role of KCNQ1 and KCNE2 in thyroid function.
  • Analysis of the interplay between thyroid-stimulating hormone and cardiac ion channels.

Main Results:

  • KCNQ1 and KCNE2 form a thyroid-stimulating hormone-stimulated potassium channel in the thyroid.
  • This channel is essential for normal thyroid hormone biosynthesis.
  • Mutations in KCNQ1 and KCNE genes are linked to both cardiac arrhythmias and potentially thyroid dysfunction.

Conclusions:

  • A novel genetic connection exists between cardiac and thyroid physiology.
  • Understanding this link may lead to new therapeutic approaches for Long QT Syndrome, atrial fibrillation, and thyroid disorders.
  • Targeting the KCNQ1/KCNE2 channel complex could offer a unified treatment strategy.