Abstract
Membrane-associated binding sites for estrogen may mediate rapid effects of estradiol-17β that contribute to proliferation of human breast cancers. After controlled homogenization and fractionation of MCF-7 breast cancer cells, the bulk of specific estradiol binding is found in nuclear fractions. However, a significant portion of specific, high-affinity estradiol-17β binding-sites are also enriched in plasma membranes. These estradiol binding-sites co-purify with 5′-nucleotidase, a plasma membrane-marker enzyme, and are free from major contamination by cytosol or nuclei. Electrophoresis of membrane fractions allowed detection of a primary 67-kDa protein and a secondary 46-kDa protein recognized by estradiol-17β and by a monoclonal antibody directed to the ligand-binding domain of the nuclear form of estrogen receptor. Estrogen-induced growth of MCF-7 breast cancer cells in vitro was blocked by treatment with the antibody to estrogen receptor and correlated closely with acute hormonal activation of mitogen-activated protein kinase and Akt kinase signaling. Estrogen-promoted growth of human breast cancer xenografts in nude mice was also significantly reduced by treatment in vivo with the estrogen receptor antibody. Thus, membrane-associated forms of estrogen receptor may play a role in promoting intracellular signaling for hormone-mediated proliferation and survival of breast cancers and offer a new target for antitumor therapy.
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Acknowledgements
We acknowledge Dr E Montecino and C-P Ng for assistance with flow cytometry. Dr M Parker generously provided ERE-CAT reporter gene constructs, and Dr H Garban and Dr CM Szego offered helpful discussions and comments. Support from US Army DAMD17-001-0177.
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Márquez, D., Pietras, R. Membrane-associated binding sites for estrogen contribute to growth regulation of human breast cancer cells. Oncogene 20, 5420–5430 (2001). https://doi.org/10.1038/sj.onc.1204729
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DOI: https://doi.org/10.1038/sj.onc.1204729
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