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• W2325266178 abstract "Breast cancer is one of the most prevalent cancers worldwide. Distance metastasis is responsible for patient mortality. Therefore, understanding the mechanisms underlying tumor pathogenesis and metastasis is crucial for the development of novel therapies as well as preventive strategies for those who are prone to breast cancer. In contrast to transcriptional gene regulation, posttranscriptional control mechanisms of gene expression are poorly understood. Yet, many metastasis genes are regulated by RNA binding proteins (RBPs) at the levels of mRNA stability and translation. The paraneoplastic antigen, HuR, is an RBP shown to regulate multiple genes that are significantly related to breast cancer metastasis by stabilizing target mRNAs and facilitating translation into proteins. Using novel techniques developed in our lab of RNA immunoprecipitation applied to microarrays (RIP-Chip) we identified novel discrete HuR-associated mRNAs in triple negative breast cancer and estrogen receptor positive breast cancer. Many of these HuR-associated mRNA transcripts were metastasis related. We investigated the role of HuR in an aggressive triple-negative breast cancer metastatic cell line, LM2. The LM2 cells were retrovirally transduced with triple fusion reporter construct encoding thymidine kinase1, GFP and firefly luciferase to obtain in vivo and in vitro tracking capabilities. The cells were further transfected with plasmid containing HA-HuR or empty vector control to demonstrate the function of HuR in LM2. HuR over-expressing clones showed greater metastatic capability by in vitro matrigel invasion assay. Furthermore, athymic mice that were intravenously injected with HuR over-expressing LM2 cells had greater (335-fold more) tumor metastasis to the lungs than empty vector control injected group as measured by IVIS imaging. Mice injected with HuR over-expressing LM2 cells were more moribund and had greater mortality as compared with mice injected with empty vector control cells. These results suggest that HuR may play a role in breast cancer metastasis by stabilizing various pro-metastatic genes. The implications of this work are twofold. First, HuR RIP-Chip can be used to identify novel cancer relevant genes and second, interference with HuR function may ameliorate distant metastasis in breast cancer, potentially providing new therapeutic approaches for treatment. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the Second AACR International Conference on Frontiers in Basic Cancer Research; 2011 Sep 14-18; San Francisco, CA. Philadelphia (PA): AACR; Cancer Res 2011;71(18 Suppl):Abstract nr A27." @default.
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• W2325266178 date "2011-09-15" @default.
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• W2325266178 title "Abstract A27: Coordinate posttranscriptional regulation of breast cancer metastasis genes by RNA binding protein HuR" @default.
• W2325266178 doi "https://doi.org/10.1158/1538-7445.fbcr11-a27" @default.
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