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Related Concept Videos

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...
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...
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...
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...

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Related Experiment Video

Updated: Jul 11, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

P-glycoprotein polymorphism in hypo- and hyper-thyroidism patients.

Günfer Turgut1, Mehmet Baştemir, Sebahat Turgut

  • 1Faculty of Medicine, Department of Physiology, University of Pamukkale, Denizli, 20070, Turkey. gturgut@pau.edu.tr

Molecular Biology Reports
|September 25, 2007
PubMed
Summary

P-glycoprotein (Pgp) polymorphism does not predict hypothyroidism or hyperthyroidism. However, Pgp C alleles are linked to higher free T3 levels in hyperthyroidism patients, suggesting a role in thyroid hormone distribution.

Related Experiment Videos

Last Updated: Jul 11, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Area of Science:

  • Pharmacogenomics
  • Endocrinology
  • Molecular Biology

Background:

  • P-glycoprotein (Pgp), encoded by the MDR1 gene, influences drug distribution across various tissues.
  • Pgp expression is modulated by genetic polymorphisms, notably the MDR1 C3435T variant.
  • Altered Pgp activity may impact thyroid hormone levels and the efficacy of related medications.

Purpose of the Study:

  • To investigate the association between Pgp C3435T polymorphism and thyroid hormone distribution.
  • To determine if Pgp polymorphism frequency differs in patients with hypothyroidism and hyperthyroidism.
  • To explore the relationship between Pgp genotypes and serum thyroid hormone levels.

Main Methods:

  • Genotyping for Pgp C3435T polymorphism in 35 hyperthyroidism (Graves' disease), 78 hypothyroidism (Hashimoto's thyroiditis) patients, and 100 controls.
  • Analysis of genotype frequencies and serum free T3 levels in relation to Pgp polymorphism.
  • Statistical comparison of polymorphism distribution and hormone levels between patient groups and controls.

Main Results:

  • No significant difference in Pgp C3435T polymorphism frequency was observed between hypo- and hyperthyroidism patients and healthy controls.
  • Hyperthyroidism patients with the Pgp C allele exhibited higher serum free T3 levels compared to those with the T allele.
  • No significant differences in CC, CT, or TT genotype frequencies were found among the study groups.

Conclusions:

  • Pgp polymorphism is unlikely to be a predictive factor for the development of hypothyroidism or hyperthyroidism.
  • A significant association exists between Pgp and elevated serum free T3 levels in hyperthyroidism patients.
  • Further research is warranted to elucidate the precise role of Pgp in thyroid hormone regulation.