Abstract
Abstract Breast cancer is the most common cancer and the second leading cause of cancer-related deaths among women. MicroRNAs (miRNAs) have been shown to be key regulators of cancer-related processes including cell proliferation, survival, migration and invasion. Here, we performed a small scale miRNA mimic screen to identify miRNAs leading to inhibition of cell survival and epithelial-mesenchymal transition (EMT), both of which are key parameters for tumor growth and metastasis. We identified a miRNA (miR-644) which leads to apoptosis in p53-mutated breast cancer cell lines, but not in p53-wild type ones. Furthermore, in vitro migration and invasion assays revealed that miR-644 inhibits both migration and invasion by interfering with the EMT process. Then, we combined whole genome mRNA profiling with target prediction algorithms to determine the potential targets of this miRNA, and identified transcriptional co-repressor CTBP1 as a novel direct target which is already known for limiting apoptosis by repressing Bax transcription. CTBP1 has also been reported to bind ZEB transcription factors and assists EMT by enhancing ZEB-mediated downregulation of E-Cadherin. We showed that silencing of CTBP1 phenocopies the effects of miR-644 in induction of p53-independent apoptosis and blocking EMT and cell invasion. Currently, we are testing the role of miR-644 and its target CTBP1 in tumor growth and metastasis in in vivo assays. Overall, our results suggest that miR-644 is a novel tumor suppressor miRNA co-regulating EMT and cell survival and it could be a potential target for breast cancer therapy. Note: This abstract was not presented at the meeting. Citation Format: Umar Raza, Stefan Uhlmann, Emre Yurdusev, Stefan Wiemann, Ozgur Sahin. A novel tumor suppressor miRNA co-regulating EMT and p53-independent cell survival in breast cancer. [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Res 2015;75(15 Suppl):Abstract nr 241. doi:10.1158/1538-7445.AM2015-241
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