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• W4362596543 abstract "Abstract Metastasis is a multistep process that leads to the formation of clinically detectable tumor foci at distant organs and, frequently, to patient demise. Only a subpopulation of breast cancer cells within the primary tumor can disseminate systemically and cause metastasis. To disseminate, cancer cells must express MenaINV, an isoform of the actin-regulatory protein, Mena, encoded by the ENAH gene that endows tumor cells with transendothelial migration activity allowing them to enter and exit the blood circulation. We have previously demonstrated that MenaINV mRNA and protein expression is induced in cancer cells by macrophage contact. Here, we report on the discovery of the precise mechanism by which macrophages induce MenaINV expression in tumor cells. We examined the promoter of the human and mouse ENAH gene and discovered a conserved NF-κB transcription factor binding site. Using live imaging of an NF-κB activity reporter and staining of fixed tissues from mouse and human breast cancer we further determined that, for maximal induction of MenaINV in cancer cells, NF-κB needs to cooperate with the Notch1 signaling pathway. Mechanistically, Notch1 signaling does not directly increase MenaINV expression, but instead enhances and sustains NF-κB signaling through retention of p65, an NF-κB transcription factor, in the nucleus of tumor cells, leading to increased MenaINV expression. In mice, these signals are augmented following chemotherapy treatment and abrogated upon macrophage depletion. Targeting Notch1 signaling in vivo decreased NF-κB signaling and MenaINV expression in the primary tumor and decreased metastasis. Altogether, these data uncover mechanistic targets for blocking MenaINV induction that should be explored clinically to decrease cancer cell dissemination and improve survival of patients with metastatic disease. Citation Format: Camille L. Duran, George S. Karagiannis, Xiaoming Chen, Ved P. Sharma, David Entenberg, John S. Condeelis, Maja H. Oktay. Cooperative NF-KappaB and Notch1 signaling promotes a macrophage-mediated metastatic phenotype in breast cancer. [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 3598." @default.
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• W4362596543 date "2023-04-04" @default.
• W4362596543 modified "2023-09-25" @default.
• W4362596543 title "Abstract 3598: Cooperative NF-KappaB and Notch1 signaling promotes a macrophage-mediated metastatic phenotype in breast cancer" @default.
• W4362596543 doi "https://doi.org/10.1158/1538-7445.am2023-3598" @default.
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