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Related Concept Videos

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...
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...
Drugs Affecting Neurotransmitter Synthesis01:29

Drugs Affecting Neurotransmitter Synthesis

Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
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

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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, and heat...

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Related Experiment Video

Updated: Jun 12, 2026

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse
04:14

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse

Published on: October 6, 2023

Drugs affecting thyroid function.

Giuseppe Barbesino1

  • 1Thyroid Unit, Massachusetts General Hospital-Harvard Medical School, Boston, Massachusetts 02114, USA. gbarbesino@partners.org

Thyroid : Official Journal of the American Thyroid Association
|June 29, 2010
PubMed
Summary
This summary is machine-generated.

Numerous drugs for nonthyroidal conditions can impact thyroid function, with new interactions emerging. Clinicians must be aware of these drug-induced thyroid side effects for proper patient monitoring.

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Last Updated: Jun 12, 2026

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse
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A Versatile, Behavioral Method to Investigate Thyroid Hormone Effects on Cerebellar Function

Published on: October 6, 2023

Area of Science:

  • Endocrinology
  • Pharmacology
  • Oncology

Background:

  • Many medications used for nonthyroidal conditions can alter thyroid function.
  • Novel drug interactions affecting the thyroid are continually being identified.
  • Understanding these interactions is crucial as new therapies emerge.

Purpose of the Study:

  • To review clinically significant thyroid side effects associated with drugs used for nonthyroidal conditions.
  • To highlight recent developments and drugs with major clinical relevance.
  • To provide clinicians with essential information on drug-induced thyroid dysfunction.

Main Methods:

  • Literature review of existing studies and clinical data.
  • Focus on novel drug classes like tyrosine kinase inhibitors and immune modulators.
  • Analysis of established drug interactions, including amiodarone and lithium.

Main Results:

  • Tyrosine kinase inhibitors can cause hypothyroidism or affect thyroid hormone metabolism.
  • Immune modulators may lead to hyperthyroidism or hypothyroidism via immune or non-immune mechanisms.
  • Amiodarone and lithium have well-documented, complex effects on thyroid function.

Conclusions:

  • Drug-induced thyroid dysfunction is a significant clinical concern.
  • Clinicians need to monitor patients for thyroid-related side effects, especially with new drug therapies.
  • Familiarity with thyroid-drug interactions aids in managing patient care and potential complications.