Cited by 86Estrogen and related hormone effectsBreast Cancer Treatment StudiesEffects and risks of endocrine disrupting chemicals

Antiestrogenic properties of keoxifene trans-4-hydroxytamoxifen, and ICI 164384, a new steroidal antiestrogen, in ZR-75-1 human breast cancer cells.

Poulin, Richard, Merand, Yves, Poirier, Donald, Levesque, Charles, Dufour, Jean-Marc, Labrie, Fernand·1989·Breast Cancer Research and Treatment

Abstract

The agonistic/antagonistic properties of two non-steroidal antiestrogens, namely trans-4-monohydroxytamoxifen (OH-TAM) and keoxifene (LY156758), and the new steroidal antiestrogen ICI164384, a 7 alpha-alkylamide derivative of estradiol (E2), were assessed by measuring their effect on the proliferation of ZR-75-1 cells, an estrogen-responsive human breast cancer cell line. While subnanomolar concentrations of both OH-TAM and LY156758 had significant estrogenic stimulatory activity on cell growth in the absence of estrogens and higher concentrations were inhibitory, ICI164384 behaved exclusively as a growth inhibitor and more potently so than the two other compounds. The three antiestrogens had similar potency to inhibit the mitogenic effect of E2 and at 300 nM, all antiproliferative effects were completely reversible by the estrogen. ICI164384 was a weaker competitor of 3H-labeled E2 or R2858 (moxestrol) uptake in intact ZR-75-1 cells in a 1-hour assay, partly because of a slower intracellular access to estrogen specific binding sites. Moreover, ICI164384 interacted in a rapidly (approximately 6 h) reversible manner with estrogen-specific binding sites, while the non-steroidal antiestrogens induced a longer-acting (greater than 24 h) down-regulation of specific [3H]R2858 uptake. The present data indicate that, among the antiestrogens studied, ICI164384 is the only compound acting as a pure antiestrogen in ZR-75-1 breast cancer cells, while LY156758 and OH-TAM behave as antiestrogens endowed with partial agonistic activity in this system.

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Crossref · 10.1007/bf01805977

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Authors
Poulin, R., Merand, Y., Poirier, D., Levesque, C., Dufour, J.-M., & Labrie, F.
Affiliations
Centre hospitalier de l'Université Laval (CA)
Venue
Breast Cancer Research and Treatment
Published
1989-10
Volume
14
Issue
1
Pages
65-76
ISSN
  • 0167-6806 (ISSN-L)
  • 1573-7217
OpenAlex
W1988508767
Cited by
86
References
52
Citations by year
2017: 1 · 2016: 1 · 2012: 2
FWCI
2.20
Type
journal article
Language
en
Open access
closed
Locations
  • Breast Cancer Research and Treatment (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Medical Research Council Canada
  • Research England
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Breast Cancer Treatment Studies
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Effects and risks of endocrine disrupting chemicals
Keywords
ZR-75-1 cells, breast cancer, estrogen receptor, estrogen agonist activity, cell proliferation
MeSH terms
Binding, Competitive, Breast Neoplasms, Cell Division, Dexamethasone, Dose-Response Relationship, Drug, Drug Interactions, Estradiol, Estrogen Antagonists, Humans, Piperidines, Receptors, Estrogen, Dihydrotestosterone, Tamoxifen, Time Factors, Tumor Cells, Cultured, Raloxifene Hydrochloride, Polyunsaturated Alkamides

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