Thyrotropin subunit beta
approvedAlso known as: Thyroid-stimulating hormone subunit beta, Thyrotropin beta chain, TSHB, P01222
**Mechanism of Action** Thyrotropin subunit beta (TSHB) is the β-chain of thyroid-stimulating hormone (TSH), a heterodimeric glycoprotein essential for hypothalamic-pituitary-thyroid axis regulation. TSHB non-covalently associates with the α-subunit (common to LH, FSH, hCG) to form bioactive TSH. TSH binds to the TSH receptor (TSHR) on thyroid follicular cells, activating Gs-protein/cAMP and Gq/11 pathways. This stimulates thyroid hormone (T3/T4) synthesis and secretion, iodide uptake, thyroglobulin production, and thyroid cell proliferation. TSHB is exclusively expressed in pituitary thyrotrophs, and its secretion is regulated by thyrotropin-releasing hormone (TRH) and negative feedback from thyroid hormones. **Key Research Findings** TSHB mutations cause congenital hypothyroidism (CH) with autosomal recessive inheritance, characterized by low TSH but normal α-subunit levels. Over 20 pathogenic variants (e.g., missense, frameshift) have been identified, impairing subunit dimerization or receptor binding. TSHB is also a biomarker for pituitary function; suppressed levels indicate hyperthyroidism or central hypothyroidism. Animal models show TSHB knockout mice exhibit hypothyroidism, growth retardation, and thyroid atrophy. Approved recombinant human TSH (rhTSH) uses the α-subunit with TSHB to stimulate radioiodine uptake in thyroid cancer monitoring. **Clinical Relevance** TSHB is a validated therapeutic target for thyroid disorders. Recombinant TSH (Thyrogen®) is FDA-approved for adjunctive use in thyroid cancer follow-up, enabling radioiodine imaging without hormone withdrawal. TSHB gene testing aids diagnosis of CH in neonates with ambiguous TSH levels. TSHB measurement differentiates primary (high TSH) from central (low TSH) hypothyroidism. No direct TSHB-based therapies exist for hyperthyroidism, but TSHR antagonists are in development. For research purposes only — not medical advice.
Key data
MTALFLMSMLFGLTCGQAMSFCIPTEYTMHIERRECAYCLTINTTICAGYCMTRDINGKLFLPKYALSQDVCTYRDFIYRTVEIPGCPLHVAPYFSYPVALSCKCGKCNTDYSDCIHEAIKTNYCTKPQKSYLVGFSVMechanism of action
Indispensable for the control of thyroid structure and metabolism
Research & studies
Maternal T3 treatment in either half of pregnancy did not affect postnatal growth or serum thyroxine levels.; Heart weight was significantly increased in adult wild-type offspring exposed to maternal T3 in either half of pregnancy, but TRα1 mutant males were protected.; Heart rate was significantly increased only in male mice exposed to elevated maternal T3 during the second half of pregnancy.; Serum selenium levels were reduced by maternal T3 treatment in wild-type offspring of both genders.
Three BAC clones (trhr1a, trhr2, thr) showed double signals, indicating genomic duplication from TS-WGD.; The tsh BAC clone was highly conserved, with its genes located on a single chromosome across all studied species.; Micro-synteny analysis revealed most candidate genes are in conserved genomic surroundings.; Cynoglossus semilaevis is the nearest species to S. senegalensis, while Danio rerio is the most distant.
Frequently asked questions
What is Thyrotropin subunit beta?
**Mechanism of Action** Thyrotropin subunit beta (TSHB) is the β-chain of thyroid-stimulating hormone (TSH), a heterodimeric glycoprotein essential for hypothalamic-pituitary-thyroid axis regulation. TSHB non-covalently associates with the α-subunit (common to LH, FSH, hCG) to form bioactive TSH. TSH binds to the TSH r
How does Thyrotropin subunit beta work?
Indispensable for the control of thyroid structure and metabolism
What is the research status of Thyrotropin subunit beta?
Thyrotropin subunit beta is currently classified as approved, with 9 research references on record. This is for research purposes only and is not medical advice.
What is the molecular weight of Thyrotropin subunit beta?
Thyrotropin subunit beta has a molecular weight of approximately 15639 g/mol.
Related peptides
Insulin decreases blood glucose concentration.
Parathyroid hormone elevates calcium level by dissolving the salts in bone and preventing their renal excretion .
Calcitonin is a peptide hormone that causes a rapid but short-lived drop in the level of calcium and phosphate in blood by promoting the incorporation of those ions in the bones.
Nonapeptide posterior pituitary hormone driving uterine contraction and milk letdown; studied intranasally for social cognition.
The carboxylated form is one of the main organic components of the bone matrix, which constitutes 1-2% of the total bone protein .
Gastrin stimulates the stomach mucosa to produce and secrete hydrochloric acid and the pancreas to secrete its digestive enzymes.
Build on Thyrotropin subunit beta data programmatically
Structured peptide data, semantic search, and AI summaries via one API.
Get a free API key