Thyrotropin subunit beta (TSHB) (TSHB)

Thyrotropin subunit beta (TSHB) is the unique, specificity-conferring component of the dimeric thyroid-stimulating hormone (TSH), a glycoprotein produced by the anterior pituitary gland [5, 6]. TSHB non-covalently associates with a common alpha subunit to form the functional TSH hormone, which is critical for the regulation of the thyroid gland's structure and metabolism [4, 13]. By binding to the G-protein coupled thyroid-stimulating hormone receptor (TSHR), the TSHB-containing complex stimulates the synthesis and secretion of thyroid hormones, thyroxine (T4) and triiodothyronine (T3), which control systemic metabolic processes [12, 13]. Clinically, TSHB is central to the diagnosis and management of thyroid disorders. Mutations in the TSHB gene are a primary cause of congenital central hypothyroidism, where the absence of functional hormone leads to thyroid atrophy and developmental delay [3, 6]. Recombinant human TSH (Thyrotropin alfa) is used therapeutically as a diagnostic tool and in the management of well-differentiated thyroid cancer to facilitate radioiodine uptake and thyroglobulin testing [4, 13]. Beyond thyroid-specific roles, emerging research links TSHB levels and signaling to broader metabolic conditions such as non-alcoholic fatty liver disease (NAFLD) and changes in bone mineral density [11, 14].

Other names

Thyroid stimulating hormone subunit betaThyroid stimulating hormone betaThyrotropin beta chainTSH-BTSH-betaThyroid-stimulating hormone subunit beta

Acts as an agonist of the Thyroid-stimulating hormone receptor (TSHR) to stimulate thyroid hormone production and thyroid cell growth.