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Related Concept Videos

Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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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...
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Functions of Thyroid Hormones01:18

Functions of Thyroid Hormones

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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...
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Major Hormones and Their Functions01:27

Major Hormones and Their Functions

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Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and...
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Blood Studies for Cardiovascular System III: Serum Lipid Profile01:25

Blood Studies for Cardiovascular System III: Serum Lipid Profile

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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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The Thyroid Gland01:23

The Thyroid Gland

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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...
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Synthesis and Functions of Calcitonin00:51

Synthesis and Functions of Calcitonin

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Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
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Updated: Jun 13, 2025

Experimental Approach to Examine Leptin Signaling in the Carotid Bodies and its Effects on Control of Breathing
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Circulating leptin levels in thyroid dysfunction: a systematic review and meta-analysis.

Shanshan Liu1,2,3, Jun Ma1,2,3, Leyuan Zhang1,2,3

  • 1The First Clinical Medical College, Gansu University of Chinese Medicine, Lanzhou, Gansu, 730000, China.

BMC Endocrine Disorders
|June 6, 2025
PubMed
Summary
This summary is machine-generated.

Circulating leptin levels are significantly elevated in hypothyroidism but not hyperthyroidism. Leptin may be directly regulated by thyroid-stimulating hormone (TSH) and triiodothyronine (T3) in thyroid dysfunction.

Keywords:
LeptinMeta-analysisThyroid dysfunctionThyroid hormone

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Area of Science:

  • Endocrinology
  • Metabolism

Background:

  • Leptin regulates energy homeostasis, similar to thyroid hormone (TH).
  • Thyroid dysfunction (TD) may impact leptin levels.
  • Understanding this relationship is crucial for metabolic health.

Purpose of the Study:

  • To investigate circulating leptin levels in patients with thyroid dysfunction.
  • To explore the association between leptin and thyroid hormone levels in TD.

Main Methods:

  • Systematic review and meta-analysis of electronic databases (PubMed, Embase, Cochrane Library, Web of Science).
  • Inclusion of 38 studies with 4295 subjects (hypothyroidism, hyperthyroidism, euthyroid controls).
  • Pooled standardized mean difference (SMD) calculated using random effects model.

Main Results:

  • Leptin levels were significantly higher in hypothyroidism (SMD = 0.71) and not significantly altered in hyperthyroidism (SMD = -0.03) compared to euthyroidism.
  • Subgroup analysis confirmed elevated leptin in overt and subclinical hypothyroidism.
  • Leptin showed a positive correlation with TSH (r=0.19) and a negative correlation with T3 (r=-0.40) in TD.

Conclusions:

  • Circulating leptin levels are significantly elevated in hypothyroidism, independent of BMI.
  • Leptin levels are not significantly altered in hyperthyroidism.
  • Leptin regulation in TD may be directly influenced by TSH and T3 levels.