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Related Concept Videos

Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
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...
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...
Hyperthyroidism I: Introduction01:25

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...
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...
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...

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Related Experiment Video

Updated: Jun 9, 2026

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
12:08

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Published on: May 22, 2013

Familial longevity is associated with decreased thyroid function.

M P Rozing1, J J Houwing-Duistermaat, P E Slagboom

  • 1Department of Gerontology and Geriatrics, Leiden University Medical Center, Leiden, The Netherlands.

The Journal of Clinical Endocrinology and Metabolism
|August 27, 2010
PubMed
Summary
This summary is machine-generated.

Low thyroid activity is a heritable trait linked to longevity. This study found that lower parental mortality correlated with thyroid function changes in long-lived siblings, supporting a genetic link to exceptional lifespan.

Related Experiment Videos

Last Updated: Jun 9, 2026

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
12:08

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Published on: May 22, 2013

Area of Science:

  • Endocrinology
  • Genetics
  • Gerontology

Background:

  • A link between reduced thyroid function and increased lifespan in humans is recognized.
  • Hereditary and genetic factors influencing thyroid activity have been previously established.

Purpose of the Study:

  • To investigate if low thyroid activity is a heritable characteristic associated with extreme longevity.
  • To determine if this heritable phenotype contributes to familial longevity within the Leiden Longevity Study.

Main Methods:

  • Cross-sectional study involving 859 nonagenarian siblings from 421 long-lived families in the Netherlands.
  • Analysis of serum thyroid function parameters (TSH, free T4, free T3) from blood samples.
  • Calculation of parental family mortality history score and its correlation with sibling thyroid function.

Main Results:

  • A lower parental mortality score was significantly associated with higher serum TSH levels in nonagenarian siblings (P = 0.005).
  • Lower parental mortality also correlated with lower free T4 (P = 0.002) and free T3 (P = 0.034) levels in the siblings.
  • These findings suggest a connection between parental longevity and offspring thyroid function.

Conclusions:

  • The study supports the hypothesis that low thyroid activity is a heritable phenotype.
  • This heritable trait appears to contribute to the exceptional familial longevity observed in the Leiden Longevity Study.
  • Thyroid function may play a role in the genetic basis of extreme human lifespan.