Project 4 has been a leader in revealing the myriad roles played by microRNAs in human cancer. We will build upon this foundation with an increased biological focus on breast cancer. We will isolate the six, well defined mammary epithelial cell types from normal virgin and parous female mice and define their miRNA and mRNA expression profiles. In so doing, we hope to better define the mammary stem cell (MaSC) and gain an appreciation for the pathways that maintain its self-renewal. This will include a definition of miRNAs and miRNA targets that are important in the MaSC. Using normal cells as a reference point, we will work to understand the relafionship between mammary tumor initiating cells and normal mammary stem cells. In part, we aim to test the relevance of tumor initiating populations, which thus far have only been detected in transplantation studies, to breast cancer in in vivo models of basal tumorigenesis. We hope to identify pathways that determine tumor initiating potential and to relate these to self-renewal pathways used by mammary stem cells. We appreciate that both normal and tumor cells function in context, and we will therefore strive to understand how the in vivo niche supports MaSC self-renewal. Similarly, we will ask whether tumor initiating cells occupy a niche or whether their special status is a cell autonomous property. With the realization that it is usually metastatic disease that kills patients, we will also probe the niches occupied by disseminated tumor cells, which can lie dormant for decades following initial treatment before they progress to frank metastases. Using a series of highly innovative strategies, including molecular profiling, RNAi-based genetics, and sophisticated imaging a whole, this Project takes a comprehensive approach to understanding the roles of miRNAs in breast cancer.

Public Health Relevance

One in every 8 women will be diagnosed with breast cancer in her lifetime. Despite substantial progress in molecular phenotyping and targeted therapy, we still lack the capacity to manage disease in the long term for more than 75% of women. The work proposed herein will deepen our understanding of breast cancer and may reveal new strategies for targeted intervention, particularly in the prevention of metastatic disease.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Research Program Projects (P01)
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Cold Spring Harbor Laboratory
Cold Spring Harbor
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Diermeier, Sarah D; Chang, Kung-Chi; Freier, Susan M et al. (2016) Mammary Tumor-Associated RNAs Impact Tumor Cell Proliferation, Invasion, and Migration. Cell Rep 17:261-74
O'Rourke, Kevin P; Dow, Lukas E; Lowe, Scott W (2016) Immunofluorescent Staining of Mouse Intestinal Stem Cells. Bio Protoc 6:
Anczuków, Olga; Krainer, Adrian R (2016) Splicing-factor alterations in cancers. RNA 22:1285-301
Tschaharganeh, Darjus F; Lowe, Scott W; Garippa, Ralph J et al. (2016) Using CRISPR/Cas to study gene function and model disease in vivo. FEBS J 283:3194-203
Hossain, Manzar; Stillman, Bruce (2016) Opposing roles for DNA replication initiator proteins ORC1 and CDC6 in control of Cyclin E gene transcription. Elife 5:
Arun, Gayatri; Diermeier, Sarah; Akerman, Martin et al. (2016) Differentiation of mammary tumors and reduction in metastasis upon Malat1 lncRNA loss. Genes Dev 30:34-51
Tschaharganeh, Darjus F; Xue, Wen; Calvisi, Diego F et al. (2016) p53-Dependent Nestin Regulation Links Tumor Suppression to Cellular Plasticity in Liver Cancer. Cell 165:1546-1547
O'Rourke, Kevin P; Ackerman, Sarah; Dow, Lukas E et al. (2016) Isolation, Culture, and Maintenance of Mouse Intestinal Stem Cells. Bio Protoc 6:
Tschaharganeh, Darjus F; Bosbach, Benedikt; Lowe, Scott W (2016) Coordinated Tumor Suppression by Chromosome 8p. Cancer Cell 29:617-9
Guo, Ya; Xu, Quan; Canzio, Daniele et al. (2015) CRISPR Inversion of CTCF Sites Alters Genome Topology and Enhancer/Promoter Function. Cell 162:900-10

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