Thyroxine

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Thyroxine

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4 Posts

abueso
Forum Newbie

Topics: 9
Posts: 19

06/05/04 - 01:47 PM

Is surreptitious ingestion of thyroxine considered to be T3 or T4.....
Would it cause an increase in T4 lab result?
I was under the impresion that thyroxine is already in its active form and would not be converted to T4 out of the thyroid. Your thoughts?

mani
Forum Guru
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Topics: 104
Posts: 1,403

06/05/04 - 05:00 PM

actuallu T4 is called thyroxine, ,i think this would clear the picture for u

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dariush
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Topics: 20
Posts: 356

06/06/04 - 11:31 AM

mani is right, T4=Thyroxin
however T4 although higher in conc. is less potent than T3 and usually in the periph. is converted to T3 which is a more ACTIVE form, by "5-deiodinase" enzyme.
remember some of the drugs for hyperthyroidism block this very enzyme (e.g. Plicamycin,TPU)

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dariush
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Topics: 20
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06/06/04 - 11:33 AM

btw, T3=Tri-iodo-thronin

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