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• W2956130107 abstract "Abstract INTRODUCTION: Colorectal cancer (CRC) is the second-leading cause of cancer-related death in the United States. A better understanding of the regulation of CRC cell survival pathways is necessary for developing new therapeutic strategies for patients with metastatic CRC (mCRC). We have previously found that endothelial cells (ECs) from the liver, the most common site of CRC metastases, secrete soluble factors in their conditioned medium (CM) that, in turn, increase cell growth and chemoresistance of CRC cells. We also determined that EC-induced CRC cell survival is mediated, in part, by HER3/ERRB3 signaling. OBJECTIVES: In the current study we sought to determine if alterations in driver mutations mediate the role of liver ECs in activating HER3 signaling and promoting cell survival in CRC cells. METHODS: Primary ECs from non-malignant liver parenchyma were isolated as previously described (Wang et al., Mol Cancer Res., 2018). CRC cell lines with distinct molecular profiles (MSI status, and wildtype or mutant KRAS, BRAF, and PIK3CA) were incubated with either their own CM (control) or CM from ECs. The effects of CM on CRC cell growth and response to 5-fluorouracil (5-FU) was determined by MTT and colony formation assays. The effect of angiocrine signaling on chemoresistance was also determined by fluorescence-activated cell sorting (FACS) for apoptosis after treating CRC cells with 5-FU, either in control CM or EC CM. HER3 blockade was accomplished by 1) siRNA knockdown or 2) a HER3 antibody. RESULTS: CM from liver ECs significantly increased cell growth and chemoresistance in CRC cells regardless of the gene alteration profiles in in vitro assays. We confirmed that EC CM activated the HER3-AKT signaling pathway in CRC cells. Furthermore, we found that HER3 blockade attenuated EC CM-induced AKT activation and cell survival in CRC cells independent of the cell mutational profile. CONCLUSIONS: Our results demonstrate that HER3 mediates liver EC-induced cell growth and chemoresistance in CRC cells independent of the driver mutational profiles of the cells. The genetic background of CRC cells is not a mediator of EC CM-induced HER3 activation and cell survival. These findings suggest that effects of HER3 targeting of tumor cells in patients with mCRC should be independent of MSI status, or RAS, BRAF, or PIK3CA mutational status. Citation Format: Rui Wang, Rajat Bhattacharya, Fan Fan, Xiangcang Ye, Lee M. Ellis. Angiocrine induction of colorectal cancer cell HER3 activation and cell survival is independent of CRC mutational status [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 5163." @default.
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• W2956130107 date "2019-07-01" @default.
• W2956130107 modified "2023-09-27" @default.
• W2956130107 title "Abstract 5163: Angiocrine induction of colorectal cancer cell HER3 activation and cell survival is independent of CRC mutational status" @default.
• W2956130107 doi "https://doi.org/10.1158/1538-7445.am2019-5163" @default.
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