Tyrosine is an amino acid we need to eat (in the diet), to get enough for making thyroid hormones.
It's not "released" from somewhere.
Not according to research.
The thyroid hormones are made inside the thyroid in the thyroid follicular cells.
Thyroid follicles have an epithelial layer around the gelatinous colloid center of the thyroid cell, the latter of which consists mainly of thyroglobulin.
In these cells, to make hormones, tyrosine is needed and must be "iodinated" as foll:
* Iodide must be attached to tyrosine, requiring presence of all four of:
- iodine
- hydrogen peroxide (H2O2)
- thyroid peroxidase enzyme
- thyroglobulin
So this reaction is in the thyroid follicles as all four components must be together and that's where the thyroglobulin is.
Reaction components are:
...Iodine is oxidized by H2O2 to make iodide (and Iodine is stored mainly in the thyroid)
...Iodide combines with tyrosine which is already a part of the thyroglobulin (which is a very large molecule in these thyroid cells)
and this forms T1, OR T2 (depending whether binding is with 1 or 2 transformed iodide atoms) all catalysed by the enzyme present in the thyroid, thyroid peroxidase.
TO MAKE THE HORMONES:
Two T2's join to make T4 hormone.
One T1 plus one T2 make T3 hormone.
These hormones are stored in the thymus with the thyroglobulin till needed.
When needed, they are separated from the thyroglobulin and sent into the bloodstream.
REF:The Sodium/Iodide Symporter (NIS): Characterization, Regulation, and
Medical Significance. By ORSOLYA DOHA´ N, ANTONIO DE LA VIEJA, VIKTORIYA
PARODER, CLAUDIA RIEDEL, MONA ARTANI, MIA REED, CHRISTOPHER S. GINTER,
AND NANCY CARRASCO (2003)
It is benign in natural forms - serious reactions only occur with compounds that are not normal to the body such as potassium iodide.
I've learned that the hard way personally, as well as seeing research on it.
I can eat seaweed to my heart's content - but cannot tolerate iodine injections for xray dye etc.
It's a chemical reaction issue with the FORM of iodine to which adverse (chemical) reactions occur.
I've not gone into it in enough depth to figure out the actual chemical reaction triggered by potassium iodide in many people. Those unexpected chemical reactions can be so complex with all the chemicals in the body's bloodstream or gut.
It's taken me months for example to figure the chemical reactions of magnesium chloride in the gut. They are surprisingly violent and damaging. (The first of several nasty ones is that MgCl2 reacts with HCl in an exothermic way - setting up a major heat producing reaction that causes boiling and burning inside - and which is made worse if you drink water to try to cool the burn. It's why Mg Cl2 tablets are enteric coated. It goes on the react also with the Sodium bicarb that is excreted next to fix the pH before the stomach is emptied, with still more adverse effects. It's why Mg Cl2 tablets are enteric coated.)
We can too easily forget all the reactive chemicals inside us - and they do NOT "know" that MgCl or KI (potassium iodide) is not supposed to be present in that form in any natural situation! The body just does the chemical reactions, and we suffer the consequences! KI is very reactive!
Always - IF it is natural from seaweed etc.
Amino acids are components of proteins we eat. "Uncoupling" them is what the digestive process does. We can only absorb them into the system as amino acids - not as complete proteins. If complete proteins get through the gut wall, we will have foreign protein reactions - allergic reactions.
Namaste,
Irene
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--
Irene de Villiers, B.Sc AASCA MCSSA D.I.Hom/D.Vet.Hom.
P.O. Box 4703 Spokane WA 99220.
www.angelfire.com/fl/furryboots/clickhere.html (Veterinary Homeopath.)
"Man who say it cannot be done should not interrupt one doing it."