|Accession Number||DB00024 (BTD00020, BIOD00020)|
|Groups||Approved, Vet Approved|
Thyrotropin alfa is a recombinant form of thyroid stimulating hormone used in performing certain tests in patients who have or have had thyroid cancer. It is also used along with a radioactive agent to destroy remaining thyroid tissue in certain patients who have had their thyroid gland removed because of thyroid cancer. It is a heterodimeric glycoprotein comprised of two non-covalently linked subunits, an alpha subunit of 92 amino acid residues containing two N-linked glycosylation sites and a beta subunit of 112 residues containing one N-linked glycosylation site. The alpha subunit is nearly identical to that of human chorionic gonadotropin (hCG), luteinizing hormone (LH), and follicle-stimulating hormone (FSH). The alpha subunit is thought to be the effector region responsible for stimulation of adenylate cyclase (involved the generation of cAMP). The beta subunit (TSHB) is unique to TSH, and therefore determines its receptor specificity. The amino acid sequence of thyrotropin alfa is identical to that of human pituitary thyroid stimulating hormone.
|Protein chemical formula||C975H1513N267O304S26|
|Protein average weight||22672.9 Da|
>Alpha chain APDVQDCPECTLQENPFFSQPGAPILQCMGCCFSRAYPTPLRSKKTMLVQKNVTSESTCC VAKSYNRVTVMGGFKVENHTACHCSTCYYHKS
>Beta chain FCIPTEYTMHIERRECAYCLTINTTICAGYCMTRDINGKLFLPKYALSQDVCTYRDFIYR TVEIPGCPLHVAPYFSYPVALSCKCGKCNTDYSDCIHEAIKTNYCTKPQKSYDownload FASTA Format
|External IDs||Not Available|
|Product Ingredients||Not Available|
|Approved Prescription Products|
|Approved Generic Prescription Products||Not Available|
|Approved Over the Counter Products||Not Available|
|Unapproved/Other Products||Not Available|
|International Brands||Not Available|
|Brand mixtures||Not Available|
For detection of residueal or recurrent thyroid cancer
Binding of thyrotropin alfa to TSH receptors on normal thyroid epithelial cells or on well-differentiated thyroid cancer tissue stimulates iodine uptake and organification. Thyrogen is an exogenous source of human TSH that offers an additional diagnostic tool in the follow-up of patients with a history of well-differentiated thyroid cancer.
|Mechanism of action|
Thyrotropin Alfa binds to the thyrotropin receptors found on any residual thyroid cells or tissues. This stimulates radioactive iodine uptake for better radiodiagnostic imaging.
Time to peak: Median: 10 hours (range: 3-24 hours) After a single intramuscular injection of 0.9 mg of thyrotropin alfa: Cmax= 116+38mU/L, Tmax=22+8.5 hours. AUC=5088+1728 mU·hr/L.
|Volume of distribution||Not Available|
|Protein binding||Not Available|
|Route of elimination|
kidney and liver
25 ± 10 hours
No difference in efficacy and toxicity between adult and geriatric patients. No studies in lactating women, pregnant women and pediatrics. Cautionary administration is advised.
|Pharmacogenomic Effects/ADRs||Not Available|
|Drug Interactions||No interactions found.|
|Food Interactions||Not Available|
|General References||Not Available|
|ATC Codes||H01AB01 — Thyrotropin alfa|
|FDA label||Download (2.27 MB)|
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|Super Class||Organic Acids|
|Class||Carboxylic Acids and Derivatives|
|Sub Class||Amino Acids, Peptides, and Analogues|
|Alternative Parents||Not Available|
|Molecular Framework||Not Available|
|External Descriptors||Not Available|
- Pharmacological action
- General Function:
- Thyroid-stimulating hormone receptor activity
- Specific Function:
- Receptor for thyrothropin. Plays a central role in controlling thyroid cell metabolism. The activity of this receptor is mediated by G proteins which activate adenylate cyclase. Also acts as a receptor for thyrostimulin (GPA2+GPB5).
- Gene Name:
- Uniprot ID:
- Molecular Weight:
- 86828.965 Da
- Szkudlinski MW: Recombinant human thyrotropins of the twenty-first century. Expert Opin Pharmacother. 2004 Dec;5(12):2435-40. [PubMed:15571461 ]
- Conway GS: Clinical manifestations of genetic defects affecting gonadotrophins and their receptors. Clin Endocrinol (Oxf). 1996 Dec;45(6):657-63. [PubMed:9039330 ]
- Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [PubMed:11752352 ]