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Thyroid follicular cells (also called thyroid epithelial cells or thyrocytes [1]) are the major cell type in the thyroid gland, and are responsible for the production and secretion of the thyroid hormones thyroxine (T 4) and triiodothyronine (T 3).
At the microscopic level, there are three primary features of the thyroid—thyroid follicles, thyroid follicular cells, and parafollicular cells, first discovered by Geoffery Websterson in 1664. [14] Follicles. Thyroid follicles are small spherical groupings of cells 0.02–0.9mm in diameter that play the main role in thyroid function. [4]
The thyroid hormones cross the follicular cell membrane towards the blood vessels by an unknown mechanism. [31] Text books have stated that diffusion is the main means of transport, [45] but recent studies indicate that monocarboxylate transporter (MCT) 8 and 10 play major roles in the efflux of the thyroid hormones from the thyroid cells. [32 ...
Thyroglobulin (Tg) is a 660 kDa, dimeric glycoprotein produced by the follicular cells of the thyroid and used entirely within the thyroid gland. Tg is secreted and accumulated at hundreds of grams per litre in the extracellular compartment of the thyroid follicles, accounting for approximately half of the protein content of the thyroid gland. [5]
Thyroid hormone synthesis, with Pendrin seen at center between the follicular colloid and the follicular cell. In the thyroid, pendrin is expressed by thyroid follicular cells. Na + /I − symporter imports iodide (I −) into the cell across its basolateral side, and pendrin extrudes the I − across the cell's apical membrane into the thyroid ...
The TSH receptor is found mainly on thyroid follicular cells. [12] Stimulation of the receptor increases T 3 and T 4 production and secretion. This occurs through stimulation of six steps in thyroid hormone synthesis: (1) Up-regulating the activity of the sodium-iodide symporter (NIS) on the basolateral membrane of thyroid follicular cells ...
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