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

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Polychlorinated biphenyl-mediated decrease in serum thyroxine level in rodents.

Yoshihisa Kato1, Koichi Haraguchi, Yuriko Ito

  • 1Tokushima Bunri University, Sanuki, Kagawa, Japan. kato@kph.bunri-u.ac.jp

Drug Metabolism and Disposition: the Biological Fate of Chemicals
|December 31, 2009
PubMed
Summary

Polychlorinated biphenyls (PCBs) like Kanechlor-500 (KC500) decrease serum thyroxine (T4) in rodents by increasing T4 accumulation in the liver. This PCB exposure affects thyroid hormone levels across multiple species.

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Area of Science:

  • Environmental Toxicology
  • Endocrinology
  • Pharmacokinetics

Background:

  • Polychlorinated biphenyls (PCBs) are persistent environmental pollutants with known endocrine-disrupting effects.
  • Thyroid hormones, including thyroxine (T4) and triiodothyronine (T3), are crucial for regulating metabolism and development.
  • The impact of specific PCB mixtures on thyroid hormone homeostasis across different species remains an area of investigation.

Purpose of the Study:

  • To investigate the effects of Kanechlor-500 (KC500), a commercial PCB mixture, on serum thyroid hormone levels in various rodent models.
  • To elucidate the mechanisms underlying KC500-induced alterations in thyroid hormone metabolism and distribution.

Main Methods:

  • Administration of a single intraperitoneal injection of KC500 to male mice, hamsters, rats, and guinea pigs.
  • Measurement of serum total T4, free T4, and T3 levels.
  • Assessment of serum thyroid-stimulating hormone (TSH) levels.
  • Evaluation of hepatic T4-UDP-glucuronosyltransferase activity.
  • Analysis of biliary excretion of radiolabeled T4 glucuronide.
  • Determination of serum T4 clearance, distribution volumes, and liver-to-serum concentration ratios.

Main Results:

  • KC500 significantly decreased serum total T4 and free T4 in all tested species (mice, hamsters, rats, guinea pigs).
  • Serum T3 decreased significantly only in guinea pigs; TSH levels remained unchanged in rodents.
  • KC500 promoted serum T4 clearance and increased T4 distribution into the liver across all rodent species tested.
  • Increased hepatic T4-UDP-glucuronosyltransferase activity was observed only in guinea pigs, while increased biliary T4 glucuronide excretion occurred only in rats.

Conclusions:

  • KC500 exposure leads to a significant reduction in serum T4 levels in mice, hamsters, rats, and guinea pigs.
  • The primary mechanism for KC500-induced hypothyroxinemia involves enhanced hepatic accumulation of T4.
  • These findings highlight the species-specific and common effects of PCBs on thyroid hormone regulation and distribution.