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Endocrinology Vol. 139, No. 4 1981-1990
Copyright © 1998 by The Endocrine Society

ARTICLES

Estrogen-Induced c-fos Protooncogene Expression in MCF-7 Human Breast Cancer Cells: Role of Estrogen Receptor Sp1 Complex Formation1

Renqin Duan, Weston Porter and Stephen Safe2

Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, Texas 77843-4466

Address all correspondence and requests for reprints to: Dr. Stephen Safe, Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, Texas 77843-4466. E-mail: ssafe{at}cvm.tamu.edu

17ß-Estradiol (E2) induces c-fos protooncogene expression in MCF-7 human breast cancer cells, and previous studies in HeLa cells identified an imperfect palindromic estrogen-responsive element (-1212 to -1200) that was required for trans-activation. In contrast, the estrogen-responsive element was not required for E2 responsiveness in MCF-7 cells, and using a series of constructs containing wild-type (pF1) and mutant 5'-flanking sequences (-1220 to -1155) from the c-fos protooncogene promoter in transient transfection assays, it was shown that a GC-rich motif (5'-GGGGCGTGG) containing an imperfect Sp1-binding site was required for hormone-induced activity. This sequence also bound Sp1 protein in gel mobility shift assays, and coincubation with the estrogen receptor (ER) enhanced Sp1-DNA binding. E2 and 4'-hydroxytamoxifen, but not ICI 164,384, induced reporter gene activity in cells transiently transfected with pF1. E2 induced reporter gene activity in MDA-MB-231 breast cancer cells transiently cotransfected with pF1 and wild-type ER or variant ER in which the DNA-binding domain was deleted (HE11); plasmids expressing N-terminal or C-terminal domains of the ER containing activator function-1 or -2, respectively, were inactive in these assays. In contrast, only wild-type ER mediated 4'-hydroxytamoxifen-induced activity. Induction of c-fos protooncogene expression by E2 in MCF-7 cells is dependent on the formation of a transcriptionally active ER/Sp1 complex that binds to a GC-rich enhancer element.




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