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Related Concept Videos

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...
Role of Skin in Vitamin D Synthesis01:23

Role of Skin in Vitamin D Synthesis

The skin plays a crucial role in the synthesis of vitamin D, a vital nutrient for various physiological processes in the body. Vitamin D is unique because it can be synthesized in the skin through a series of chemical reactions triggered by exposure to ultraviolet B (UVB) radiation from sunlight.
The solar UV B rays (290-315 nm) are absorbed by the skin, and 7-dehydrocholesterol (provitamin D3) photolyzes it to previtamin D3, which undergoes a rapid transformation to vitamin D3(cholecalciferol).
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...
Therapeutic Drug Monitoring: Affecting Factors01:29

Therapeutic Drug Monitoring: Affecting Factors

Therapeutic Drug Monitoring (TDM) is the clinical practice of measuring specific drug levels in a patient's blood or body tissues to manage and optimize therapy. TDM is crucial for drugs with narrow therapeutic windows, like warfarin and phenytoin, where incorrect doses can lead to treatment failure or severe side effects. This monitoring ensures the dosage administered is within a safe and effective range. The factors affecting therapeutic drug monitoring include:Patient-Specific Factors:a.
Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu01:29

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...

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Related Experiment Videos

Genetically Predicted 25-Hydroxyvitamin D Levels on Hypothyroidism: A Two-Sample Mendelian Randomization.

Mahdi Akbarzadeh1, Sahand Tehrani Fateh2, Aysan Moeinafshar2

  • 1Cellular and Molecular Endocrine Research Center, Research Institute for Endocrine Molecular Biology, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran, sbmu.ac.ir.

Biomed Research International
|June 8, 2026
PubMed
Summary
This summary is machine-generated.

Higher 25-hydroxyvitamin D levels are linked to a reduced risk of hypothyroidism. This Mendelian randomization study suggests vitamin D supplementation may help prevent hypothyroidism.

Keywords:
25-hydroxyvitamin DMendelian randomizationcausalitygenome-wide association studyhypothyroidismthyroid-stimulating hormone (TSH)

Related Experiment Videos

Area of Science:

  • Endocrinology
  • Nutritional Science
  • Genetics

Background:

  • Vitamin D deficiency is linked to increased thyroid disease risk.
  • The causal relationship between 25-hydroxyvitamin D and hypothyroidism requires further investigation.

Purpose of the Study:

  • To investigate the causal association between genetically determined 25-hydroxyvitamin D levels and hypothyroidism risk.
  • To explore the relationship with Hashimoto's thyroiditis and thyroid hormone levels.

Main Methods:

  • Two-sample Mendelian randomization (MR) analysis using GWAS summary statistics.
  • Utilized inverse-variance-weighted (IVW) method and sensitivity analyses for robust results.
  • Focused on European ancestry populations.

Main Results:

  • Significant inverse causal association found between higher 25-hydroxyvitamin D and lower hypothyroidism risk (P < 0.001).
  • Higher 25-hydroxyvitamin D levels were associated with increased free T4 levels (P < 0.001).
  • No significant causal link was observed for Hashimoto's thyroiditis or TSH levels.

Conclusions:

  • Evidence supports a potential causal role of 25-hydroxyvitamin D in reducing hypothyroidism risk.
  • Findings suggest vitamin D supplementation could be a preventive strategy for hypothyroidism.