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H6278

Sigma-Aldrich

4-Hydroxytamoxifen

≥98% (HPLC), powder, Tamoxifen metabolite

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Synonym(s):
4-(1-[4-(Dimethylaminoethoxy)phenyl]-2-phenyl-1-butenyl)phenol, 4-OHT, cis/trans-4-Hydroxytamoxifen
Empirical Formula (Hill Notation):
C26H29NO2
CAS Number:
Molecular Weight:
387.51
UNSPSC Code:
51111800
PubChem Substance ID:
NACRES:
NA.77

Quality Level

assay

≥98% (HPLC)

form

powder

storage condition

desiccated
protect from light

solubility

methanol: 10 mg/mL
ethanol: 20 mg/mL (with heating)

antibiotic activity spectrum

neoplastics

mode of action

enzyme | inhibits

originator

AstraZeneca

storage temp.

2-8°C

SMILES string

CC\C(c1ccccc1)=C(/c2ccc(O)cc2)c3ccc(OCCN(C)C)cc3.CC\C(c4ccccc4)=C(\c5ccc(O)cc5)c6ccc(OCCN(C)C)cc6

InChI

1S/2C26H29NO2/c2*1-4-25(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/h2*5-17,28H,4,18-19H2,1-3H3/b26-25+;26-25-

InChI key

ZJLDABGSDWXVGE-BDSXMVAQSA-N

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General description

4-Hydroxytamoxifen (4-OHT), a first-generation selective estrogen receptor modulator (SERM), acts as an antagonist in breast cancer cells but exhibits estrogen-like effects in the uterus and bone. It is an active metabolite of the pro-drug tamoxifen (TAM), functioning as an estrogen receptor antagonist. 4-OHT binds to estrogen receptors to inhibit estradiol-induced cell proliferation without inducing cytotoxicity. It is a metabolite of the antiestrogen, tamoxifen and exhibits a higher affinity than tamoxifen and its other metabolites for binding to estrogen receptors, making it 50 to 100 times more potent in inhibiting cell proliferation in normal human breast cells and breast cancer cell lines in culture.

4-OHT effectively inhibited cell growth in the absence of estrogen when cell proliferation was stimulated by insulin or epidermal growth factor. 4-OHT inhibits lipid peroxidation within cell membranes and shows peroxyl radical scavenging activity.

Application

4-Hydroxytamoxifen has been used:
  • to induce the recombination of small intestinal organoids.
  • to study its impact on the ability of human peripheral blood mononuclear cells (PMNCs) to form hematopoietic colonies.
  • to induce overexpression of MYCN in the neuroblastoma cell line to determine how the elevated MYCN expression influences the sensitivity of neuroblastoma cells to BIRC5/survivin inhibitor, YM155-induced apoptosis.

Biochem/physiol Actions

Metabolite of the chemotherapeutic drug tamoxifen, exhibiting more potent estrogen agonist/antagonist activity than the parent drug. Also active as intra-membranous inhibitor of lipid peroxidation.

Features and Benefits

This compound is featured on the Nuclear Receptors (Steroids) page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.
This compound was developed by AstraZeneca. To browse the list of other pharma-developed compounds and Approved Drugs/Drug Candidates, click here.

pictograms

Health hazardExclamation mark

signalword

Warning

Hazard Classifications

Acute Tox. 4 Dermal - Acute Tox. 4 Inhalation - Acute Tox. 4 Oral - Eye Irrit. 2 - Repr. 2 - Skin Irrit. 2

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type P3 (EN 143) respirator cartridges


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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YM155 inhibits neuroblastoma growth through degradation of MYCN: A new role as a USP7 inhibitor
Li X, et al.
Journal of Separation Science, 181, 106343-106343 (2023)
4-Hydroxytamoxifen is an isoform-specific inhibitor of orphan estrogen-receptor-related (ERR) nuclear receptors beta and gamma
Tremblay GB, et al.
Endocrinology, 142, 4572-4575 (2001)
Tamoxifen for the treatment of myeloproliferative neoplasms: A Phase II clinical trial and exploratory analysis
Fang Z, et al.
Nature Communications, 14(1), 7725-7725 (2023)
Tamoxifen and hydroxytamoxifen as intramembraneous inhibitors of lipid peroxidation. Evidence for peroxyl radical scavenging activity
Cust'odio JBA, et al.
Biochemical Pharmacology, 47, 1989-1998 (1994)
Formulation of anti-miR-21 and 4-hydroxytamoxifen co-loaded biodegradable polymer nanoparticles and their antiproliferative effect on breast cancer cells
Devulapally R, et al.
Molecular Pharmaceutics, 12, 2080-2092 (2015)

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