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- Efflux of thyroxine and triiodothyronine from follicular cells, which appears to be largely through monocarboxylate transporter (MCT) 8 and 10, [32] [33] and entry into the blood. Thyroid hormones (T 4 and T 3 ) are produced by the follicular cells of the thyroid gland and are regulated by TSH made by the thyrotropes of the anterior pituitary ...
Levothyroxine, also known as L-thyroxine, is a synthetic form of the thyroid hormone thyroxine (T 4). [5] [8] It is used to treat thyroid hormone deficiency (hypothyroidism), including a severe form known as myxedema coma. [5]
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]
The hormones secreted from the gland are about 80–90% T 4 and about 10–20% T 3. [36] [37] Deiodinase enzymes in peripheral tissues remove the iodine from MIT and DIT and convert T 4 to T 3 and RT 3. [34] This is a major source of both RT 3 (95%) and T 3 (87%) in peripheral tissues. [38]
Liothyronine may be used when there is an impaired conversion of T 4 to T 3 in peripheral tissues. [2] The dose of liothyronine for hypothyroidism is a lower amount than levothyroxine due it being a higher concentrated synthetic medication. [2]
Desiccated thyroid has been described in the United States Pharmacopoeia for a century as "the cleaned, dried, and powdered thyroid gland previously deprived of connective tissue and fat... obtained from domesticated animals that are used for food by man" (USP XVI). [15]