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Transcriptional Activation Of The Mir-17-92 Cluster Is Involved In The Growth-Promoting Effects Of Myb In Human Ph-Positive Leukemia Cells., Manuela Spagnuolo, Giulia Regazzo, Marco De Dominici, Andrea Sacconi, Andrea Pelosi, Etleva Korita, Francesco Marchesi, Francesco Pisani, Alessandra Magenta, Valentina Lulli, Iole Cordone, Andrea Mengarelli, Sabrina Strano, Giovanni Blandino, Maria G. Rizzo, Bruno Calabretta

Department of Cancer Biology Faculty Papers

MicroRNAs, non-coding regulators of gene expression, are likely to function as important downstream effectors of many transcription factors including MYB. Optimal levels of MYB are required for transformation/maintenance of BCR-ABL-expressing cells. We investigated whether MYB silencing modulates microRNA expression in Philadelphia-positive (Ph+) leukemia cells and if MYB-regulated microRNAs are important for the "MYB addiction" of these cells. Thirty-five microRNAs were modulated by MYB silencing in lymphoid and erythromyeloid chronic myeloid leukemia-blast crisis BV173 and K562 cells; 15 of these were concordantly modulated in both lines. We focused on the miR-17-92 cluster because of its oncogenic role in tumors and found …