thyroxin


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Related to thyroxin: Levothyroxine

thy·rox·ine (T4),

, thyroxin (thī-rok'sēn, -sin),
The l-isomer is the active iodine compound existing normally in the thyroid gland and extracted therefrom in crystalline form for therapeutic use; also prepared synthetically; used for the relief of hypothyroidism, cretinism, and myxedema.

thy·rox·ine

, thyroxin (thī-rok'sēn, -sin)
The active iodine compound existing normally in the thyroid gland and extracted therefrom in crystalline form for therapeutic use; also prepared synthetically; used for the relief of hypothyroidism, congenital hypothyroidism, and myxedema.

Thyroxin

The hormone secreted by the thyroid gland.
Mentioned in: Goiter

thy·rox·ine

, thyroxin (thī-rok'sēn, -sin)
The active iodine compound existing normally in the thyroid gland and extracted therefrom in crystalline form for therapeutic use; also prepared synthetically; used for the relief of congenital hypothyroidism, and myxedema.

thyroxine, thyroxin

a hormone of the thyroid gland that contains iodine and is a derivative of the amino acid tyrosine. The chemical name for thyroxine is tetraiodothyronine (symbol, T4); it is formed and stored in the thyroid follicles as thyroglobulin, the storage form. Thyroxine is released from the gland by the action of a proteolytic enzyme. T4 is deiodinated in peripheral tissues to form tri-iodothyronine (T3), which has a greater biological activity.
Thyroxine acts as a catalyst in the body and influences a great variety of effects, including metabolic rate (oxygen consumption); growth and development; metabolism of carbohydrates, fats, proteins, electrolytes and water; vitamin requirements; reproduction; and resistance to infection.
Thyroxine can be extracted from animals or made synthetically; it is used in the treatment of hypothyroidism and some types of goiter.

free thyroxine
the metabolically active fraction of thyroxine; abbreviated FT4, Tf. T4 = Tf + TBG. The amount is very small and difficult to estimate so that the amount present in serum is not used as a more accurate indicator of thyroxine status than T4.
thyroxine-binding globulin (TBG)
most (99.95%) of the thyroxine in plasma is bound to globulin and a small amount bound to prealbumin.
thyroxine-binding prealbumin
bound to a small fraction of circulating T4. This is the only known function of prealbumins.
L-thyroxine
References in periodicals archive ?
The excessive thyroxin means that the body's metabolic rate is increased.
It's not too serious and, if anything, I might lose weight by taking thyroxin, which would be a really exciting side effect
However, thyroxin is more complicated than this and performs other activities all around the body and also has huge impact on energy levels and protein synthesis.
The 44-year-old was in isolation for 48 hours and put on thyroxin medication.
It turned out that she had a big deficiency of thyroxin and a scan on the throat revealed quite a big tumour.
1983, "Changes in plasma concentrations of thyroxin, triiodothyronin, cholesterol and total lipids in beef steers fed runnel," J.
Thyroxin suppression treatment was started and lithium therapy was switched to carbamazepine.
I'd had some blood tests done, to do with a thyroid problem, and the doctor phoned me saying, 'Well, the thyroxin levels are fine but the blood test indicates you may be pregnant'.
Iodine is needed by the thyroid gland during the production of thyroxin, a growth hormone.
Iodine is needed in the formation of the hormone thyroxin.
One of the male participants received supplemental thyroxin for congenital hypothyroidism, one of the female participants had received chelation therapy for the treatment of exposure to lead, and each participant had a history of mild seizures.

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