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- W2044173606 abstract "Background The t(9;22) translocation leads to the formation of the chimeric breakpoint cluster region/c-abl oncogene 1 (BCR/ABL) fusion gene on der22, the Philadelphia chromosome. The p185BCR/ABL or the p210BCR/ABL fusion proteins are encoded as a result of the translocation, depending on whether a “minor” or “major” breakpoint occurs, respectively. Both p185BCR/ABL and p210BCR/ABL exhibit constitutively activated ABL kinase activity. Through fusion to BCR the ABL kinase in p185BCR/ABL and p210BCR/ABL “escapes” the auto-inhibition mechanisms of c-ABL, such as allosteric inhibition. A novel class of compounds including GNF-2 restores allosteric inhibition of the kinase activity and the transformation potential of BCR/ABL. Here we investigated whether there are differences between p185BCR/ABL and p210BCR/ABL regarding their sensitivity towards allosteric inhibition by GNF-2 in models of Philadelphia chromosome-positive acute lymphatic leukemia.Design and Methods We investigated the anti-proliferative activity of GNF-2 in different Philadelphia chromosome-positive acute lymphatic leukemia models, such as cell lines, patient-derived long-term cultures and factor-dependent lymphatic Ba/F3 cells expressing either p185BCR/ABL or p210BCR/ABL and their resistance mutants.Results The inhibitory effects of GNF-2 differed constantly between p185BCR/ABL and p210BCR/ABL expressing cells. In all three Philadelphia chromosome-positive acute lymphatic leukemia models, p210BCR/ABL-transformed cells were more sensitive to GNF-2 than were p185BCR/ABL-positive cells. Similar results were obtained for p185BCR/ABL and the p210BCR/ABL harboring resistance mutations.Conclusions Our data provide the first evidence of a differential response of p185BCR/ABL- and p210BCR/ABL- transformed cells to allosteric inhibition by GNF-2, which is of importance for the treatment of patients with Philadelphia chromosome-positive acute lymphatic leukemia." @default.
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- W2044173606 date "2011-11-04" @default.
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- W2044173606 title "p185BCR/ABL has a lower sensitivity than p210BCR/ABL to the allosteric inhibitor GNF-2 in Philadelphia chromosome-positive acute lymphatic leukemia" @default.
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- W2044173606 doi "https://doi.org/10.3324/haematol.2011.047191" @default.
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