Target intelligence / Profile preview

Thyroxine (T4)

Target
T4
Molecular classification
Hormone, Amino Acid Derivative
01

Overview

Thyroxine, commonly abbreviated as T4, is a major hormone produced by the thyroid gland. It is the primary form of thyroid hormone circulating in the blood and acts as a prohormone for triiodothyronine (T3), which is more biologically active. T4 plays an essential role in regulating metabolism, energy production, growth, and development throughout the body.

Other names
L-thyroxineTetraiodothyronine
02

Mechanism of action

Binds to nuclear receptors after conversion to T3, influencing gene transcription and cellular metabolism.

03

Biological functions

Regulation of basal metabolic rateControl of heart rateControl of respiratory rateRegulation of body temperaturePromotion of brain developmentSupport of skeletal growthSupport of muscle functionModulation of gastrointestinal motilityInfluence on reproductive system function
04

Disease associations

HypothyroidismHyperthyroidism
05

Safety considerations

Hyperthyroidism symptoms from excessive dosageDrug interactions affecting thyroid hormone levels
06

Biomarkers

Free T4 levelsTotal T4 levelsTSH levels

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