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Endocrinology Vol. 143, No. 12 4583-4591
Copyright © 2002 by The Endocrine Society

ARTICLE

Estrogen Receptor {alpha} and Activating Protein-1 Mediate Estrogen Responsiveness of the Progesterone Receptor Gene in MCF-7 Breast Cancer Cells

Larry N. Petz, Yvonne S. Ziegler, Margaret A. Loven and Ann M. Nardulli

Department of Molecular and Integrative Physiology, University of Illinois, Urbana, Illinois 61801

Address all correspondence and requests for reprints to: Ann M. Nardulli, Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, 524 Burrill Hall, 407 South Goodwin Avenue, Urbana, Illinois 61801. E-mail: anardull{at}life.uiuc.edu.

The progesterone receptor (PR) gene is activated by estrogen in MCF-7 human breast cancer cells. Although the human PR gene does not contain an estrogen response element (ERE), we have identified a putative activating protein-1 (AP-1) site at +90 in the PR gene that was hypersensitive to deoxyribonuclease I cleavage in genomic Southern analysis, bound purified Fos and Jun, formed a complex with Fos/Jun heterodimers present in MCF-7 nuclear extracts in gel mobility shift assays, and functioned as an estrogen-responsive enhancer in transient cotransfection assays. When the +90 AP-1 site was mutated in the context of the PR gene, estrogen responsiveness was significantly decreased. Purified estrogen receptor (ER) enhanced binding of Fos and Jun to the +90 AP-1 site and bound to an adjacent imperfect ERE half-site. Mutating this ERE half-site diminished the binding of ER, Fos, and Jun and decreased transcription. Chromatin immunoprecipitation assays demonstrated that the ER, Fos, and Jun were present at the +90 AP-1 site in the endogenous PR gene only after treatment of MCF-7 cells with estrogen. These studies suggest that the cooperative interaction of the ER with Fos and Jun proteins helps confer estrogen responsiveness to the endogenous PR gene.




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