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Antiestrogenic effects of Z-1, 1-dichloro-2,3 diphenyl-2-(4-methoxyphenyl)cyclopropane(5a) on human breast cancer cells in culture.

Abstract
Compound 5a ([Z]-1, 1-Dichloro-2,3 diphenyl-2-(4-methoxyphenyl)cyclopropane) is a novel cyclopropyl compound which was shown to be a pure antiestrogen. In the present study, the antiproliferative activity of 5a was examined on estrogen receptor (ER)-positive MCF-7 and ER-negative MDA-MB-231 human breast cancer cells and A-549 human lung cancer cells using the hemocytometric trypan blue exclusion method. Compound 5a inhibited the growth of MCF-7 cells in a dose-related manner over a concentration range of 10(-9) to 10(-5) M, but did not alter the growth of MDA-MB-231 or A-549 cells. Co-administration of estradiol (10(-8) M) reversed the antiproliferative activity of 5a (10(-7) M) on MCF-7 cells. Further, an ER-dependent mechanism of action is supported by the specific ER binding of 5a in MCF-7 cells observed in this study. The influence of 5a on the cell surface morphology of MCF-7 and MDA-MB-231 cells was studied using scanning electron microscopy (SEM). Compound 5a at 10(-6) M reduced the length and density of microvilli (MV) on MCF-7 cells, which was reversed by co-administration of estradiol (10(-8) M). This compound did not alter the cell surface morphology of ER-negative MDA-MB-231 cells. In conclusion, 5a and tamoxifen inhibited the growth of ER-prositive MCF-7 cells in an estradiol-reversible manner, and had no effect on ER-negative MDA-MB-231 cells. The results of this study with human breast cancer cells suggest that 5a may be highly effective in the treatment of estrogen-dependent breast cancer and/or in the prophylactic treatment of women with a high risk of breast cancer development.
AuthorsP T Jain, J T Pento, R A Magarian
JournalAnticancer research (Anticancer Res) 1992 May-Jun Vol. 12 Issue 3 Pg. 585-90 ISSN: 0250-7005 [Print] GREECE
PMID1622114 (Publication Type: Comparative Study, Journal Article)
Chemical References
  • Estrogen Antagonists
  • Receptors, Estrogen
  • Tamoxifen
  • 1,1-dichloro-2,3-diphenyl-2-(4-methoxyphenyl)cyclopropane
  • Estradiol
Topics
  • Breast Neoplasms
  • Cell Division (drug effects)
  • Cell Line
  • Cell Membrane (drug effects, ultrastructure)
  • Dose-Response Relationship, Drug
  • Estradiol (metabolism, pharmacology)
  • Estrogen Antagonists (pharmacology)
  • Female
  • Humans
  • Kinetics
  • Microscopy, Electron, Scanning
  • Receptors, Estrogen (metabolism)
  • Tamoxifen (analogs & derivatives, metabolism, pharmacology)
  • Tumor Cells, Cultured

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