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What is thyroglobulin's role in thyroid hormone production?
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thyroid gland
Human thyroid gland.
Thyroglobulin is a glycoprotein that plays a central role in the production and storage of thyroid hormones within the thyroid gland. Its function can be summarized as follows:
- Structural Scaffold: Thyroglobulin serves as the essential structural framework for hormone synthesis. Iodine is oxidized and attached to tyrosine residues located within the thyroglobulin molecule to form iodotyrosines, which are then rearranged to create thyroxine and triiodothyronine.12
- Storage Reservoir: Stored as the primary component of thyroid colloid within the thyroid follicles, thyroglobulin acts as a reserve for these hormones. This mechanism allows the body to maintain a supply of thyroid hormones even when dietary iodine is scarce.23
- Hormone Release: When the body requires thyroid hormones, thyroglobulin is reabsorbed from the colloid into the follicular cells. There, it is hydrolyzed by enzymes, breaking the molecule down to release the active hormones into the circulation.23