Thyroid Peroxidase (TPO)
Thyroid Gland and Thyroid Hormones
Thyroid Peroxidase (TPO)
TPO catalyzes iodide oxidation, thyroglobulin iodination and coupling reactions in the apical environment. Hydrogen peroxide supports these reactions.
From synthesis to tissue action
Thyroid function involves iodide handling, hormone formation in thyroglobulin, secretion, protein binding and local conversion. Transporters, deiodinases and receptor isoforms shape tissue exposure. These steps explain why circulating total hormone and intracellular thyroid action are different measurements.
Interpreting the mechanism
TPO antibodies indicate autoimmunity rather than directly measuring catalytic activity.
Interpreting the axis
TSH and free thyroid hormones are interpreted together with symptoms and assay conditions. Illness, medicines and energy deficiency can alter the pattern. A change during heavy training should not automatically be treated as primary thyroid disease.
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