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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

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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...
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...
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...
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Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...

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Related Experiment Video

Updated: Jun 16, 2026

Induction and Analysis of Oxidative Stress in Sleeping Beauty Transposon-Transfected Human Retinal Pigment Epithelial Cells
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Induction and Analysis of Oxidative Stress in Sleeping Beauty Transposon-Transfected Human Retinal Pigment Epithelial Cells

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Oxidative stress: a required condition for thyroid cell proliferation.

Sylvie Poncin1, Sandrine Van Eeckoudt, Kevin Humblet

  • 1Unité de Morphologie Expérimentale, Université catholique de Louvain, UCL-5251, 52 Av. E. Mounier, B-1200, Brussels, Belgium.

The American Journal of Pathology
|January 23, 2010
PubMed
Summary
This summary is machine-generated.

N-acetylcysteine (NAC) and 15 deoxy-Delta12,14-prostaglandin J2 (15dPGJ2) reversed oxidative stress and goiter in a propylthiouracil (PTU) model. However, only NAC showed benefits in a perchlorate-induced goiter model, highlighting oxidative stress as crucial for thyroid growth.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Pathology

Background:

  • Goiter development is frequently linked to increased oxidative stress (OS).
  • Investigating therapeutic interventions for goiter requires understanding the roles of OS and specific agents.
  • Propylthiouracil (PTU) and perchlorate are common inducers of experimental goiter models.

Purpose of the Study:

  • To evaluate the efficacy of N-acetylcysteine (NAC) and 15 deoxy-Delta12,14-prostaglandin J2 (15dPGJ2) in mitigating OS and goiter.
  • To differentiate the effects of these agents on PTU-induced versus perchlorate-induced goiter.
  • To elucidate the relationship between OS, thyroid function, and thyroid gland proliferation.

Main Methods:

  • Goiter was induced using PTU or perchlorate in a rodent model.
  • Oxidative stress was assessed via 4-hydroxynonenal immunodetection.
  • Thyroid function was evaluated by measuring thyroxine (T4) and thyrotropin (TSH) plasma levels, and thyroglobulin (Tg-I) expression. Thyroid weight and cell proliferation markers (PCNA, cyclin D1) were quantified.

Main Results:

  • Both PTU and perchlorate induced significant increases in OS, TSH, thyroid weight, and cell proliferation, with decreased Tg-I.
  • NAC and 15dPGJ2 effectively reversed these parameters in the PTU-induced goiter model.
  • In the perchlorate model, NAC reduced OS and cell proliferation but did not normalize TSH or Tg-I. 15dPGJ2 showed minimal effects.
  • NAC demonstrated a significant reduction in thyroid weight and proliferation markers in the perchlorate model.

Conclusions:

  • NAC and 15dPGJ2 successfully counteract PTU-induced goiter effects, potentially through direct interactions with PTU.
  • These agents are less effective in perchlorate-induced goiter, suggesting differing pathogenic mechanisms.
  • NAC's ability to reduce OS correlates with reduced goiter development, indicating OS is a critical factor for thyroid growth.