Cancer Research Translational Cancer Medicine 2008: Cancer Clinical Trials and Personalized Medicine  AACR Conference on Molecular Diagnostics - 2008
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[Cancer Research 59, 5425-5428, November 1, 1999]
© 1999 American Association for Cancer Research

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[Cancer Research 59, 5425-5428, November 1, 1999]
© 1999 American Association for Cancer Research


Advances in Brief

Expression of Wild-Type Estrogen Receptor {beta} and Variant Isoforms in Human Breast Cancer1

Suzanne A. W. Fuqua2, Rachel Schiff, Irma Parra, William E. Friedrichs, Jui-Lan Su, David D. McKee, Kimberly Slentz-Kesler, Linda B. Moore, Timothy M. Willson and John T. Moore

Department of Medicine, Baylor College of Medicine, Houston, Texas 77030 [S. A. W. F., R. S., I. P., W. E. F.], and Departments of Molecular Sciences, Molecular Endocrinology and Medicinal Chemistry, Glaxo Wellcome Research and Development, Research Triangle Park, North Carolina 27709-3398 [J-L. S., D. D. M., K. S-K., L. B. M., T. M. W., J. T. M.]

It has been shown in previous studies that a variety of estrogen receptor (ER) {beta} mRNA transcripts are expressed in human breast cancer cell lines and tumors. To complement the RNA expression studies, we have developed ER-{beta}-specific antibodies to characterize ER-{beta} protein expression in breast cancer cell lines and tumors. Monoclonal antibodies were made against a peptide representing the first 18 amino acids of the longest ER-{beta} open reading frame reported to date, and polyclonal antibodies were made against a peptide within the ER-{beta} B domain. By Western blot analysis, we show that ER-{beta} protein is expressed in all cancer cell lines tested and in three of five breast tumor samples. The breast cancer cell lines showed variation in the size of the expressed ER-{beta} protein. The longest form detected was consistent with the 530-amino acid, full-length ER-{beta} sequence. Shorter ER-{beta} isoforms were detected in the ER-{alpha}-negative MDA-MB-231 and MDA-MB-435 breast cancer cell lines, likely corresponding to previously described COOH-terminal RNA variant isoforms.




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Copyright © 1999 by the American Association for Cancer Research.