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Estrogen Receptor A^ Negative Breast Cancer Tissues Express Cancer Prevention Estrogen Receptor A ^ Negative Breast Cancer Tissues Express Significant Levels of Estrogen-Independent Transcription Factors, ERB1andERB5: Potential Molecular Targets for Chemoprevention Indira Poola,1Suzanne A.W. Fuqua,4 Robert L. DeWitty,2 Jessy Abraham,1 Josephine J. Marshallack,3 and Aiyi Liu5 Abstract We have investigated the expression of two estrogen receptor h (ERh) isoforms, ERh1and ERh5, which activate gene transcription independent of estrogen or growth factors, in ERa-negative breast cancer tissues.We report here, for the first time, that ERa-negative tissues express signifi- cant levels of ERh1andERh5, and their expression levels are not different fromlevels in ERa - positive tumors. However, significant differences exist between the two racial groups, African American and Caucasian, in that the patients from the former group express higher levels of ERh1and ERh5 but not ERa.These two transcription factors could be potential molecular targets for designing chemopreventive drugs to treat ERa-negative breast cancers. It is now well accepted that unopposed stimulation of breast isoforms, ERh1 and ERh5, which can activate the same genes as epithelial cells by the natural hormone, estrogen, plays a major the ERa, independent of estrogen (1), are expressed in these role in the advancement of breast cancers. Although the exact tissues. The rational for our study is that once we establish the mechanism(s) by which estrogen causes breast cancer progres- expression of ERh in ERa-negative tissues, a novel line of ERh- sion are not known, several studies have established that targeted drugs could be designed to treat ERa-negative tumors increased gene transcription by estrogen-activated transcription similar to ERa blockers for ERa-positive tumors. We studied the factor, the estrogen receptor a (ERa), leads to genetic/cellular ERh isoform expression at mRNA levels by quantitative real- aberrations and the genesis and progression of breast cancer. time PCR and at protein levels by Western blotting and Because endogenous estrogens directly affect the growth of immunohistochemistry. We also compared the expression of breast cancer cells, estrogen deprivation either by inhibiting its these isoform mRNA levels with ERa-positive tissues. We report biosynthesis or blocking estrogen-mediated gene transcription here for the first time that ERa-negative breast cancer tissues through ERa is the primary line of therapy for all ERa-positive have significant levels of ERh gene expression, and ERh5isthe cancers. Clinical studies have shown that only ERa-positive most abundantly expressed isoform. We also report here that tumors but not ERa-negative tumors respond to the above two African American patient tumors express significantly higher therapies. The ERa-negative patients do not have the benefits of levels of ERh isoforms compared with Caucasian patient relatively safe and effective targeted endocrine therapies, because tumors. We expect that our results on ERh isoform expression their cancers are considered to be estrogen independent. in ERa-negative breast cancers will have clinical implications in In an effort to develop alternate endocrine therapies for ERa- designing a new line of ERh-targeted molecular therapies to negative breast cancer patients, we investigated whether ERh treat these cancers. 1 Authors’ Affiliations: Departments of Biochemistry and Molecular Biology, Materials and Methods 2Surgical Oncology, and 3Pathology, Howard University College of Medicine, Washington, District of Columbia; 4Breast Center, Baylor College of Medicine, 5 HotStartTaq PCR core kits, Omniscript reverse transcriptase, and Houston, Texas; and Biometry and Mathematical Statistics Branch, National Institutes of Child Health and Human Development, NIH, Bethesda, Maryland MinElute gel extraction kits were from Qiagen, Inc. (Valencia, CA). Received 4/4/05; revised 7/8/05; accepted 7/21/05. Taqman Universal PCR Master Mix, RNase inhibitor, and random Grant support: Department of Defense Breast Cancer Research Initiative Idea hexamers were from Applied Biosystems (Foster City, CA). All the award DAMD17-02-1-0409, Susan G. Komen Breast Cancer Foundation grant primers used in the current study were synthesized by Life Technologies BCTR0100473, and National Cancer Institute grant R33 CA88347 (I. Poola). Bethesda Research Laboratories (Carlsbad, CA), and 5VFAM- and The costs of publication of this article were defrayed in part by the payment of page 3VTAMARA-labeled oligonucleotide probes described here were synthe- charges. This article must therefore be hereby marked advertisement in accordance sized at Applied Biosystems. The bp numbering for ERa and ERh with 18 U.S.C. Section 1734 solely to indicate this fact. primers and probes described here were based on the sequences Requests for reprints: Indira Poola, Department of Biochemistry and Molecular published by Green et al. (2) and Ogawa et al. (3), respectively. PCR Biology, Howard University School of Medicine, 520 W Street Northwest, Washington, DC 20059. Phone: 202-806-5554; Fax: 202-806-5553/5784; quality water and Tris-EDTA buffer were from Bio Whittaker (Rockville, E-mail: [email protected]. MD). Polyclonal antibodies against ERh (H-150) were obtained from F 2005 American Association for Cancer Research. Santa Cruz Biotechnology Inc. (Santa Cruz, CA), and monoclonal doi: 10.1158/1078-0432.CCR-05-0728 antibodies against ERh were obtained from Genetex (San Antonio, TX). www.aacrjournals.org 7579 Clin Cancer Res 2005;11(20) October 15, 2005 Downloaded from clincancerres.aacrjournals.org on September 24, 2021. © 2005 American Association for Cancer Research. Cancer Prevention Protease inhibitor cocktail containing AEBSF, EDTA, Bestatin, E-64 leupeptin, and aprotinin was from Sigma (St. Louis, MO). Horseradish peroxidase–conjugated goat anti-rabbit IgG and protein molecular weight standards were from Bio-Rad (Hercules, CA). Enhanced chemi-luminescence reagents were from Amersham (Piscataway, NJ). Breast tumor samples. Breast tumor tissues were obtained from the Breast Center, Baylor College of Medicine Breast Tumor Bank (Houston, TX) and Howard University Hospital. Fresh tumor tissues were collected immediately after surgery and stored at À80jC until use. Fresh tumor tissue samples for research were routinely harvested immediately adjacent to the histologic/diagnostic sections and consid- ered to be representative of the tissue used for diagnosis. All the samples were examined by a pathologist and tissues containing >80% cancer cells were excised and used for research. ERa status in the tissues collected from Howard University Hospital was determined immuno- Fig. 1. Amplification of ERh1and ERh5 transcripts in ERa-negative breast cancer histochemically using monoclonal antibodies against NH2-terminal tissues by RT-PCR.To show the presence of ERh1and ERh5inERa-negative breast portion of the molecule at Oncotech Laboratories. The tumor tissues cancer tissues, cDNAs fromthese tissues were amplified using a sense primer in were considered positive for ERa if >5% of cancer cells showed positive exon 1and isoform-specific antisense primers as described in Materials and h h for nuclear staining. ERa status in tumor tissues collected from Baylor Methods. ER 1- and ER 5-specific primer pairs amplified 1,165-bp and 1,154-bp products respectively.The PCR products were cloned, sequenced, and College of Medicine Breast Center Tumor Bank was determined by identified as coding sequences of ERh1and ERh5. Expression of ERh isoform ligand binding assay (4). The tissues were diagnosed as ERa positive if in ERa-negative cancer tissues. Representative products fromfive tumorcDNAs. the cancer tissue extract showed >3 fmol ER/mg total tissue extract. A PCR products fromfive ER a-positive breast cancer tissues for comparative total of 60 ERa-negative (20 from Caucasian and 40 from African purposes. Primers also amplified several lower molecular products presumably exon deletion variants. American patients) and 74 ERa-positive (34 from Caucasian and 40 from African-American patients) cancer tissues were included in the current study. Tumor collection procedures were approved by the verified by both electrophoresis in 1.5% agarose gels and amplification Institutional Review Boards of both institutions. of the constitutively expressed gene, glyceraldehyde-3-phosphate dehy- RNA extraction and cDNA synthesis. Total RNA was extracted from drogenase (GAPDH). The total RNAs were reverse transcribed using frozen breast tissues using the Trizol reagent (Life Technologies Bethesda Omniscript reverse transcriptase as previously described (5, 6). Research Laboratories) as previously described (5). RNA integrity was Conventional PCR and identification of PCR products. Conventional PCRs were done in an automatic thermal cycler (MJ Research, Waltham, MA) as previously described (7). To amplify ERh1, ERh4, and ERh5 Table 1. Primers and probes for quantitation of various sequences, a sense primer in exon 1, 5V-CGCTAGAACACACCTTACCTG- ERs by real-time PCR 3V (position, exon 1, 335-355 bp; ref. 3) and isoform-specific antisense primers, 5V-AGCACGTGGGCATTCAGC-3V (position, exon 8, 1,481- Wild type (ERh1) 1,499 bp; ref. 3), 5V-GTCTGGGTTTTATATCGTCTGC-3V (position, exon Sense, 5V-TTTGGGTGATTGCCAAGAGC-3V 8, 1,612-1,632 bp; ref. 1), and 5V-CACTTTTCCCAAATCACTTCACCCT- (position, exon 7, 1,411-1,430 bp) 3V(position, exon 8, 1,464-1,489 bp; ref. 1) respectively, were applied. Antisense, 5V-AGCACGTGGGCATTCAGC-3V All the base pair
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