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Levothyroxine is a synthetic form of thyroxine (T 4), which is secreted by the thyroid gland. Levothyroxine and thyroxine are chemically identical: natural thyroxine is also in the "levo" chiral form, the difference is only in terminological preference. T 4 is biosynthesized from tyrosine. Approximately 5% of the US population suffers from over ...
As a measure of deiodination, the production of radioactive iodine and other physiological metabolites, in particular T 3 or reverse T 3, are determined and expressed (e.g. as fmol/mg protein/minute). [24] [25] In vivo, deiodination activity is estimated from equilibrium levels of free T 3 and free T 4.
Levothyroxine, a drug used to treat hypothyroidism, can lead to reduced bone mass and density in older adults with normal thyroid levels, a small cohort study has shown.
In starvation or severe somatic stress, deiodinase type 1 is inhibited which lowers circulating levels of T 3 (due to it being the main source of peripherally converted T 3 from T 4 in the plasma), causing a decrease in the metabolic rate. [3]
Thyroxine, also known as T 4, is a hormone produced by the thyroid gland.It is the primary form of thyroid hormone found in the blood and acts as a prohormone of the more active thyroid hormone, triiodothyronine (T 3). [1]
Thyroid hormones act on nearly every cell in the body. They act to increase the basal metabolic rate, affect protein synthesis, help regulate long bone growth (synergy with growth hormone) and neural maturation, and increase the body's sensitivity to catecholamines (such as adrenaline) by permissiveness. [12]