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The thyrotropin receptor (TSH receptor) is the antigen for TSH receptor antibodies (TRAbs). It is a seven transmembrane G protein-coupled receptor that is involved in thyroid hormone signalling. TRAbs are grouped depending on their effects on receptor signalling; activating antibodies (associated with hyperthyroidism), blocking antibodies ...
The TSH receptor is a member of the G protein-coupled receptor superfamily of integral membrane proteins [5] and is coupled to the G s protein. [6] It is primarily found on the surface of the thyroid epithelial cells, but also found on adipose tissue and fibroblasts. The latter explains the reason of the myxedema finding during Graves disease.
Graves' disease is an autoimmune disorder, in which the body produces antibodies that are specific to a self-protein - the receptor for thyroid-stimulating hormone. (Antibodies to thyroglobulin and to the thyroid hormones T3 and T4 may also be produced.) These antibodies cause hyperthyroidism because they bind to the TSHr and chronically ...
These two markers are an elevated level of thyroid stimulating hormone receptor antibodies (TSHR-Ab) and smoking. A positive TSHR-Ab at the end of antithyroid drug treatment increases the risk of recurrence to 90% ( sensitivity 39%, specificity 98%), a negative TSHR-Ab at the end of antithyroid drug treatment is associated with a 78% chance of ...
The thyroid-stimulating hormone receptor (TSH-R) is an antigen found in orbital fat and connective tissue, and is a target for autoimmune assault. [citation needed] On histological examination, there is an infiltration of the orbital connective tissue by lymphocytes, plasmocytes, and mastocytes.
Stimulating antibodies to the TSH receptor mimic TSH and cause Graves' disease. In addition, hCG shows some cross-reactivity to the TSH receptor and therefore can stimulate production of thyroid hormones. In pregnancy, prolonged high concentrations of hCG can produce a transient condition termed gestational hyperthyroidism. [14]
The thyroid hormone receptor (TR) [1] is a type of nuclear receptor that is activated by binding thyroid hormone. [2] TRs act as transcription factors , ultimately affecting the regulation of gene transcription and translation .
The pituitary gland secretes thyrotropin (TSH; Thyroid Stimulating Hormone) that stimulates the thyroid to secrete thyroxine (T4) and, to a lesser degree, triiodothyronine (T3). The major portion of T3, however, is produced in peripheral organs, e.g. liver , adipose tissue , glia and skeletal muscle by deiodination from circulating T4.