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SML1666

Sigma-Aldrich

4-Hydroxytamoxifen

≥98% (HPLC), solution, Tamoxifen metabolite

Synonym(s):

4-OHT, cis/trans-4-Hydroxytamoxifen

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About This Item

Empirical Formula (Hill Notation):
C26H29NO2
CAS Number:
68392-35-8
Molecular Weight:
387.51
UNSPSC Code:
12352200
NACRES:
NA.77

product name

4-Hydroxytamoxifen Ready Made Solution, 5 mg/mL in ethanol: isopropanol (95:5)

biological source

synthetic

Quality Level

200

form

solution

concentration

5 mg/mL in ethanol: isopropanol (95:5)

shipped in

dry ice

storage temp.

−20°C

InChI

1S/C26H29NO2/c1-4-25(20-8-6-5-7-9-20)26(21-10-14-23(28)15-11-21)22-12-16-24(17-13-22)29-19-18-27(2)3/h5-17,28H,4,18-19H2,1-3H3/b26-25-

InChI key

TXUZVZSFRXZGTL-QPLCGJKRSA-N

Biochem/physiol Actions

4-Hydroxytamoxifen is an active metabolite of Tamoxifen. 4-Hydroxytamoxifen is formed by cytochrome P450 2D6 in human liver and is a potent and selective estrogen receptor antagonist. 4-Hydroxytamoxifen has been used to stimulate LC3 lipidation and to form autophagic vesicles in a superoxide-dependent manner. Tamoxifen and 4-Hydroxytamoxifen markedly induce cytochrome P450 3A4 (a major drug-metabolizing enzyme) in primary cultures of human hepatocytes. 4-Hydroxytamoxifen undergoes a cis-trans (E-Z) isomerization, a process that occurs in all common laboratory solvents.
Trans isoform of 4-hydroxytamoxifen possesses antiestrogenic activity, while the cis 4-hydroxytamoxifen serves as a key agonist for estrogen receptor. 4-Hydroxytamoxifen promotes apoptosis via activation of p38 pathway in breast cancer cell cultures.

Preparation Note

4-Hydroxytamoxifen is provided in a 13 mM solution. The recommended working concentration is 10-100 μM. Therefore, 4-Hydroxytamoxifen Ready Made Solution should be diluted 1:130 - 1:1,300 in cell culture media.

Signal Word

Danger

Hazard Classifications

Aquatic Chronic 3 - Carc. 1B - Eye Irrit. 2 - Flam. Liq. 2 - Repr. 1B

Storage Class Code

3 - Flammable liquids

WGK

WGK 3

Flash Point(F)

55.4 °F

Flash Point(C)

13 °C

Certificates of Analysis (COA)

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Characterization of tamoxifen and 4-hydroxytamoxifen glucuronidation by human UGT1A4 variants.
Sun D, et al.
Breast Cancer Research, 8(4), R50-R50 (2006)
Activation of the p38 mitogen-activated protein kinase pathway by estrogen or by 4-hydroxytamoxifen is coupled to estrogen receptor-induced apoptosis.
Zhang C C and Shapiro D J
The Journal of Biological Chemistry, 275(1), 479-486 (2000)
Izumi Kaji et al.
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