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Related Concept Videos

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...
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...
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 10, 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

[Thyroid disruption induced by pentachlorophenol].

Li Liu1, Han-yi Chen, Guo-ying Yao

  • 1Key Laboratory of Public Health and Safety, Ministry of Education, Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China.

Zhonghua Yu Fang Yi Xue Za Zhi [Chinese Journal of Preventive Medicine]
|July 27, 2010
PubMed
Summary
This summary is machine-generated.

Sodium pentachlorophenol (PCP) exposure in rats disrupted thyroid hormone levels and liver function. Histological changes in the thyroid were observed, indicating PCP is a thyroid-disrupting chemical.

Related Experiment Videos

Last Updated: Jun 10, 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

Area of Science:

  • Environmental toxicology
  • Endocrinology
  • Chemical safety assessment

Context:

  • Sodium pentachlorophenol (PCP) is an industrial chemical with potential endocrine-disrupting properties.
  • Thyroid hormones are crucial for metabolism and development.
  • Assessing chemical impacts on the thyroid is vital for public health.

Purpose:

  • To evaluate the thyroid-disrupting effects of sodium pentachlorophenol (PCP) in rats.
  • To utilize the OECD TG 407 guideline for a 28-day repeated dose oral toxicity study.
  • To analyze histological and hormonal changes in the thyroid and liver.

Summary:

  • Rats exposed to high-dose PCP showed increased liver weight, altered serum thyroid hormone levels (decreased TT4/FT4 in males, decreased FT4 and increased TT3/FT3 in females), and changes in deiodinase mRNA expression (DioII in males, DioI in females).
  • Histopathological examination revealed thyroid follicular cell hyperplasia and colloid depletion.
  • Low-dose PCP exposure caused minor thyroid tissue alterations, but no significant hormonal changes.

Impact:

  • This study confirms sodium pentachlorophenol (PCP) as a thyroid-disrupting chemical.
  • Findings highlight sex-specific differences in PCP's effects on thyroid hormone regulation and deiodinase activity.
  • Results contribute to understanding the toxicological profile of PCP and inform risk assessment.