Intrinsic Regulation of Thyroid Function by Thyroglobulin
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چکیده
منابع مشابه
Melatonin in the thyroid gland: regulation by thyroid-stimulating hormone and role in thyroglobulin gene expression.
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~-14C]Tyrosine-labeled noniodinated hog thyroglobulin was iodinated enzymatically and nonenzymatically (iodine, iodide-chloramine-T, pH 7.4, or iodine monochloride, p.H 8.1). This led to similar levels of iodine incorporatzon as well as of thyroid hormone synthesis. Iodine monochloride at pH 5.5 formed “hormonogenic” iodotyrosine residues, but no hormone residues. The latter were formed when th...
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Thyroglobulin (TG), the primary synthetic product of the thyroid, is the macromolecular precursor of thyroid hormones. TG synthesis, iodination, storage in follicles, and degradation control thyroid hormone formation and secretion into the circulation. Thyrotropin (TSH), via its receptor (TSHR), increases thyroid hormone levels by up-regulating expression of the sodium iodide symporter (NIS), t...
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The kinetics of iodination and oxidation of hog thyroglobulin were studied with purified hog thyroid peroxidase and the results were compared with the reactions of free tyrosine. From Lineweaver-Burk plots and on the basis of a value of 0.83 for delta epsilon mM at 289 nm/iodine atom incorporated, the rate constant for transfer of an assumed enzyme-bound iodinium cation to thyroglobulin was est...
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ژورنال
عنوان ژورنال: Thyroid
سال: 2014
ISSN: 1050-7256,1557-9077
DOI: 10.1089/thy.2013.0344