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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...
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...
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...
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...
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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Updated: Jun 22, 2026

Experimental Approach to Examine Leptin Signaling in the Carotid Bodies and its Effects on Control of Breathing
05:45

Experimental Approach to Examine Leptin Signaling in the Carotid Bodies and its Effects on Control of Breathing

Published on: October 25, 2019

Association of hyperthyroidism with serum leptin levels.

T Nakamura1, S Nagasaka, S Ishikawa

  • 1Department of Medicine, Jichi Medical School, Tochigi, Japan.

Metabolism: Clinical and Experimental
|November 18, 2000
PubMed
Summary
This summary is machine-generated.

Thyroid hormones slightly increase serum leptin in hyperthyroidism. Treatment normalizes leptin levels as thyroid function returns to normal, indicating a direct hormone effect.

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Area of Science:

  • Endocrinology
  • Metabolic Research

Background:

  • Leptin, a key regulator of energy balance, is influenced by various metabolic and hormonal factors.
  • The relationship between thyroid hormones and leptin levels, particularly in hyperthyroidism, requires further elucidation.

Purpose of the Study:

  • To investigate the effect of thyroid hormones on serum leptin concentrations in patients with hyperthyroidism.
  • To determine if thyroid hormone levels correlate with serum leptin deviations from expected values based on body mass index (BMI).

Main Methods:

  • Compared serum leptin levels in hyperthyroid patients and BMI-matched controls.
  • Calculated percent deviation of serum leptin from BMI-predicted values (%leptin).
  • Utilized correlation and multiple regression analyses to assess the relationship between free thyroxine (T4) and %leptin.

Main Results:

  • No significant difference in absolute serum leptin levels between hyperthyroid patients and controls.
  • A weak positive correlation was found between serum free T4 and %leptin.
  • Serum leptin levels did not change significantly after antithyroid therapy, but %leptin decreased as patients became euthyroid.

Conclusions:

  • Serum leptin is slightly elevated in moderate hyperthyroidism, likely due to a direct effect of thyroid hormones.
  • Leptin levels normalize with the restoration of euthyroidism, suggesting thyroid status is a significant modulator.