Title |
Designer Monotransregulators Provide a Basis for a Transcriptional Therapy for De Novo Endocrine-Resistant Breast Cancer
|
---|---|
Published in |
Molecular Medicine, November 2009
|
DOI | 10.2119/molmed.2009.00107 |
Pubmed ID | |
Authors |
Stephanie L. Nott, Yanfang Huang, Aja Kalkanoglu, Kathryn Harper, Ming Chen, Scott F. Paoni, Bruce M. Fenton, Mesut Muyan |
Abstract |
The main circulating estrogen hormone 17beta-estradiol (E2) contributes to the initiation and progression of breast cancer. Estrogen receptors (ERs), as transcription factors, mediate the effects of E2. Ablation of the circulating E2 and/or prevention of ER functions constitute approaches for ER-positive breast cancer treatments. These modalities are, however, ineffective in de novo endocrine-resistant breast neoplasms that do not express ERs. The interaction of E2-ERs with specific DNA sequences, estrogen responsive elements (EREs), of genes constitutes one genomic pathway necessary for cellular alterations. We herein tested the prediction that specific regulation of ERE-driven genes by an engineered monomeric and constitutively active transcription factor, monotransregulator, provides a basis for the treatment of ER-negative breast cancer. Using adenovirus infected ER-negative MDA-MB-231 cells derived from a breast adenocarcinoma, we found that the monotransregulator, but not the ERE-binding defective counterpart, repressed cellular proliferation and motility, and induced apoptosis through expression of genes that required ERE interactions. Similarly, the monotransregulator suppressed the growth of ER-negative BT-549 cells derived from a breast-ductal carcinoma. Moreover, the ERE-binding monotransregulator repressed xenograft tumor growth in a nude mice model. Thus, specific regulation of genes bearing EREs could offer a therapeutic approach for de novo endocrine-resistant breast cancers. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Turkey | 2 | 14% |
Unknown | 12 | 86% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Bachelor | 3 | 21% |
Professor > Associate Professor | 3 | 21% |
Researcher | 3 | 21% |
Student > Ph. D. Student | 2 | 14% |
Librarian | 1 | 7% |
Other | 1 | 7% |
Unknown | 1 | 7% |
Readers by discipline | Count | As % |
---|---|---|
Agricultural and Biological Sciences | 8 | 57% |
Medicine and Dentistry | 3 | 21% |
Neuroscience | 1 | 7% |
Biochemistry, Genetics and Molecular Biology | 1 | 7% |
Unknown | 1 | 7% |