Tamoxifen: Difference between revisions
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== See also == | == See also == | ||
* [[Image:3stars.png]] [http://toxnet.nlm.nih.gov/cgi-bin/sis/search/r?dbs+hsdb:@term+@rn+@rel+10540-29-1+@OR+%22trans-Tamoxifen;10540-29-1%22 Tamoxifen at HSDB - human/animal toxicity and health info, emergency treatment, dosage, chemical properties] | |||
* [http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=24900307 Tamoxifen at PubChem] | * [http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=24900307 Tamoxifen at PubChem] | ||
* [http://en.wikipedia.org/wiki/Tamoxifen Tamoxifen in the Wikipedia] | * [http://en.wikipedia.org/wiki/Tamoxifen Tamoxifen in the Wikipedia] | ||
* [http://www.sigmaaldrich.com/catalog/ProductDetail.do?N4=T5648|SIGMA&N5=SEARCH_CONCAT_PNO|BRAND_KEY&F=SPEC Tamoxifen] and [http://www.sigmaaldrich.com/catalog/ProductDetail.do?N4=T9262|SIGMA&N5=SEARCH_CONCAT_PNO|BRAND_KEY&F=SPEC Tamoxifen citrate datasheets] on the Sigma website | * [http://www.sigmaaldrich.com/catalog/ProductDetail.do?N4=T5648|SIGMA&N5=SEARCH_CONCAT_PNO|BRAND_KEY&F=SPEC Tamoxifen] and [http://www.sigmaaldrich.com/catalog/ProductDetail.do?N4=T9262|SIGMA&N5=SEARCH_CONCAT_PNO|BRAND_KEY&F=SPEC Tamoxifen citrate datasheets] on the Sigma website | ||
* [http://en.wikipedia.org/wiki/Estrogen_receptor Estrogen receptor in the Wikipedia] | * [http://en.wikipedia.org/wiki/Estrogen_receptor Estrogen receptor in the Wikipedia] | ||
Revision as of 02:06, 6 April 2009
Tamoxifen
Molecular mechanism of action
Tamoxifen competitively binds to GPCR type and intracellular type estrogen receptors (ER). Binding to the intracellular ER on tumours and other tissue targets produces a nuclear complex that decreases DNA synthesis and inhibits estrogen effects. It thus acts as an estrogen antagonists which inhibits the growth of some tumours dependent on estrogen stimulation.
Tamoxifen itself is a prodrug, having relatively little affinity for the estrogen receptor. It is metabolised in the liver by the cytochrome P450 to active metabolites such as 4-hydroxytamoxifen and N-desmethyl-4-hydroxytamoxifen.
Stability
- distribution half-life: 7-14 hours
- elimination half-life:5-7 days (range: 3-21 days)
- elimination half-life of N-desmethyltamoxifen (major metabolite): 9-14 days
(estimates based on limited data probably from humans [1])
