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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...
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...
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...
Blood Studies for Cardiovascular System III: Serum Lipid Profile01:25

Blood Studies for Cardiovascular System III: Serum Lipid Profile

Understanding serum lipids is crucial for maintaining cardiovascular health and preventing heart disease and stroke.
Serum lipids are fats and fatty substances in the blood and are crucial for various bodily functions, including energy storage, cellular structure, and hormone production. Serum lipids consist of cholesterol, triglycerides, and phospholipids.
Cholesterol is a soft, fat-like substance found in all body cells. It is crucial for producing hormones, vitamin D, and substances that aid...

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Related Experiment Video

Updated: Jul 16, 2026

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation
09:29

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation

Published on: August 4, 2023

Leptin levels in Arabs with primary hyperthyroidism.

K A Al-Shoumer1, B A Vasanthy, H A Makhlouf

  • 1Division of Endocrinology and Metabolic Medicine, Department of Medicine, Kuwait University, Safat, Kuwait. KSHOUMER@hsc.kuniv.edu.kw

Annals of Saudi Medicine
|February 27, 2007
PubMed
Summary

Hyperthyroid Arab women have lower leptin levels compared to controls. Antithyroid treatment for six months did not alter these leptin levels in women.

Related Experiment Videos

Last Updated: Jul 16, 2026

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation
09:29

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation

Published on: August 4, 2023

Area of Science:

  • Endocrinology
  • Metabolic Research
  • Human Physiology

Background:

  • Hyperthyroidism is a condition affecting thyroid hormone levels.
  • Leptin plays a role in regulating appetite and metabolism.
  • Ethnic variations in hormonal status are increasingly recognized.

Purpose of the Study:

  • To investigate leptin levels in hyperthyroid Arab individuals.
  • To compare leptin status before and after treatment in hyperthyroid patients.
  • To assess differences between genders and matched controls.

Main Methods:

  • Studied 29 hyperthyroid patients and 32 matched controls.
  • Measured fasting leptin, glucose, insulin, and C-peptide.
  • Collected blood samples at diagnosis and 6 months post-treatment.

Main Results:

  • Hyperthyroid women had significantly lower leptin levels than control women, persisting after treatment.
  • Leptin levels were significantly higher in women than men across both groups.
  • Baseline hyperthyroidism was associated with higher glucose, insulin, and C-peptide, which normalized post-treatment.

Conclusions:

  • Leptin concentration is reduced in Arab women with hyperthyroidism.
  • Six months of antithyroid therapy does not significantly alter leptin levels in these patients.