Tamoxifen: Scientific Profile
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First-generation selective estrogen receptor modulator (SERM). Used in research for the study of modulation of the HPG axis and estrogen antagonism in breast tissue.
Tamoxifen is a triphenylethylene derivative classified as a selective estrogen receptor modulator (SERM). In research models, this compound demonstrates a competitive affinity for the estrogen receptors (ERα and ERβ). Its main characteristic is its dual behavior: it acts as an estrogen antagonist in breast tissue by blocking the binding of estradiol to the receptor, thereby preventing the transcription of estrogen-dependent genes in that tissue.
In endocrine research settings, Tamoxifen is studied for its ability to act as a partial agonist in the hypothalamus and pituitary gland. This action interferes with the negative feedback exerted by endogenous estrogens, resulting in an increase in the secretion of gonadotropin-releasing hormone (GnRH) and, consequently, in an elevation of luteinizing hormone (LH) and follicle-stimulating hormone (FSH).
In addition to its effects on the reproductive axis, Tamoxifen has been documented to possess agonist properties in bone tissue, contributing to the preservation of bone mineral density in experimental models, and in the lipid profile, where it can induce a reduction in LDL cholesterol concentrations. Its use in research remains fundamental for understanding the regulation of induced gynecomastia and the restoration of gonadal function.
Mechanism of action
Tamoxifen binds competitively to estrogen receptors in the cell cytoplasm. Once bound, the receptor-tamoxifen complex translocates to the nucleus, where it binds to the estrogen response elements (ERE). Unlike estradiol, Tamoxifen induces a receptor conformation that prevents the recruitment of specific coactivators necessary for gene expression in mammary tissue. In the hypothalamic-pituitary axis, it blocks estrogen-mediated inhibition, stimulating the release of gonadotropins.
Mechanism summary
Competitive antagonist of the estrogen receptor in mammary tissue and partial agonist in the hypothalamic-pituitary axis, promoting the secretion of gonadotropins.
Clinical Studies (4)
- [Nolvadex] (Brard M et al. · Soins; la revue de reference infirmiere · 1986) PMID 3637957.
- Relevance of breast cancer hormone receptors and other factors to the efficacy of adjuvant tamoxifen: patient-level meta-analysis of randomised trials (Davies, et al. · Lancet · 2011) PMID 21802721.
- Molecular mechanisms of antiestrogen action in breast cancer (Jordan, et al. · Breast Cancer Research and Treatment · 1994) PMID 7981455.
- Basic guide to the mechanisms of antiestrogen action (MacGregor, et al. · Pharmacological Reviews · 1998) PMID 9647865.
Warnings
Tamoxifen is a compound exclusively for research use (RUO); the following warnings and handling considerations apply to its use in the laboratory:
- Requires monitoring of liver function
- May interfere with the efficacy of anticoagulant agents
- Photosensitive substance; keep in opaque container
- Presence of prior thromboembolic disorders
- Severe hepatic insufficiency
- Pregnancy or lactation periods in animal models
- Known hypersensitivity to the compound
Technical data
- CAS
- 10540-29-1
- Molecular formula
- C26H29NO
- Molecular weight
- 371.51 Da
- Compound type
- sarm
- Storage
- 15-30°C in a dry place
- Shelf life (lyophilized)
- 36 months
- Shelf life (reconstituted)
- Not applicable
- Light-sensitive
- No
Frequently asked questions about Tamoxifen
What is Tamoxifen?
First-generation selective estrogen receptor modulator (SERM). Used in research for the study of modulation of the HPG axis and estrogen antagonism in breast tissue.
What is the mechanism of action of Tamoxifen?
Competitive antagonist of the estrogen receptor in mammary tissue and partial agonist in the hypothalamic-pituitary axis, promoting the secretion of gonadotropins.
What is Tamoxifen researched for?
In preclinical research, Tamoxifen is studied mainly in: Research on the prevention of induced gynecomastia; Modulation of LH and FSH secretion; Study of the restoration of the hypothalamic-pituitary-gonadal axis. Material exclusively for scientific research.
What are the chemical properties of Tamoxifen?
Molecular formula C26H29NO; molecular weight 371.51 Da; CAS number 10540-29-1.
How is Tamoxifen stored?
Storage conditions: 15-30°C in a dry place; lyophilized stability: 36 months; once reconstituted: Not applicable.
What routes of administration are studied for Tamoxifen?
In research models the following are described: Oral. Use is exclusively for scientific research.