title: Effect of antiestrogens on EGF-mediated movement of human breast cancer cells.
abstract: In a previous study we compared the influence of several growth factors on breast cancer cells in culture and observed that epidermal growth factor (EGF) enhanced the invasiveness of estrogen receptor-positive breast cancer cells. The objective of the present study was to determine the influence of three unique antiestrogens on EGF-mediated movement of human breast cancer cells. The rate of movement of MCF-7 breast cancer cells was measured using time-lapse videomicroscopy (TLVM). The MCF-7 cells were pretreated with antiestrogen (either tamoxifen, ICI-182-780 (ICI) or 1,1-dichloro-cis-2,3-diarylcyclopropane (AII)) at 10(-6) mol/l for 4 days, and then treated with EGF (10(-10) mol/l) immediately prior to TLVM. EGF enhanced the motility of the MCF-7 cells at 30-90 min post-administration. However, EGF-mediated motility of the MCF-7 cells was inhibited by antiestrogen pretreatment, with TAM and ICI producing complete inhibition of EGF-induced motility. In conclusion, this study demonstrates that EGF enhances the rate of movement of MCF-7 breast cancer cells and that antiestrogen pretreatment inhibits EGF-mediated motility.
authors.affiliation: Department of Pharmaceutical Sciences, College of Pharmacy, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73117, USA. tom-pento@ouhsc.edu
authors.forename: Gina M
authors.initials: GM
authors.lastname: Tong
authors.forename: Talitha T
authors.initials: TT
authors.lastname: Rajah
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Zang
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Bahr
authors.forename: J Thomas
authors.initials: JT
authors.lastname: Pento
mesh_terms: D001943:Breast Neoplasms / Q000188:drug therapy*; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects; D003521:Cyclopropanes / Q000494:pharmacology*; D004815:Epidermal Growth Factor / Q000494:pharmacology*; D004958:Estradiol / Q000031:analogs & derivatives* / Q000494:pharmacology; D020847:Estrogen Receptor Modulators / Q000494:pharmacology*; D005260:Female; D000077267:Fulvestrant; D006801:Humans; D013629:Tamoxifen / Q000494:pharmacology*
chemical_list: D003521:Cyclopropanes; D020847:Estrogen Receptor Modulators; D013629:Tamoxifen; D000077267:Fulvestrant; D004958:Estradiol; D004815:Epidermal Growth Factor