title: Differential regulation of growth and invasiveness of MCF-7 breast cancer cells by antiestrogens.
abstract: Estrogen increases the ability of the estrogen-dependent MCF-7 human breast cancer cell line to both proliferate and invade through an artificial basement membrane. In studying the response of MCF-7 cells to various antiestrogens, we found that 4-hydroxytamoxifen and tamoxifen inhibited cell proliferation but increased their invasiveness. In contrast, the structurally unrelated benzothiophene antiestrogens, LY117018 and LY156758, were potent antiproliferative agents which did not stimulate invasiveness. The differential effects of these antiestrogenic agents on invasion correlated with changes in production of collagenase IV, while no significant change was seen in the chemotactic activity of the cells. Invasiveness was increased by 17 beta-estradiol or 4-hydroxytamoxifen after a few hours of treatment and was rapidly lost when 17 beta-estradiol was withdrawn. Stimulation of invasiveness with 17 beta-estradiol was blocked by the antiestrogen, LY117018. Cells from the MDA-MB-231 line which lacks estrogen receptors were not affected by estrogen or antiestrogen in terms of proliferation or invasion. These studies indicate that the invasiveness of MCF-7 cells is regulated by antiestrogens through the estrogen receptor and may be mediated by collagenase IV activity. Antiestrogens which reduce both the proliferation and invasiveness of these cells may be interesting new candidates for clinical application.
authors.affiliation: Laboratory of Developmental Biology and Anomalies, National Institute of Dental Research, Bethesda, Maryland 20892.
authors.forename: E W
authors.initials: EW
authors.lastname: Thompson
authors.forename: R
authors.initials: R
authors.lastname: Reich
authors.forename: T B
authors.initials: TB
authors.lastname: Shima
authors.forename: A
authors.initials: A
authors.lastname: Albini
authors.forename: J
authors.initials: J
authors.lastname: Graf
authors.forename: G R
authors.initials: GR
authors.lastname: Martin
authors.forename: R B
authors.initials: RB
authors.lastname: Dickson
authors.forename: M E
authors.initials: ME
authors.lastname: Lippman
mesh_terms: D001943:Breast Neoplasms / Q000473:pathology*; D002455:Cell Division / Q000187:drug effects; D002633:Chemotaxis; D004958:Estradiol / Q000494:pharmacology; D004965:Estrogen Antagonists / Q000494:pharmacology*; D005260:Female; D006801:Humans; D003012:Microbial Collagenase / Q000096:biosynthesis; D009361:Neoplasm Invasiveness; D010960:Plasminogen Activators / Q000096:biosynthesis; D013629:Tamoxifen / Q000031:analogs & derivatives / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D004965:Estrogen Antagonists; D013629:Tamoxifen; C016601:afimoxifene; D004958:Estradiol; D010960:Plasminogen Activators; D003012:Microbial Collagenase