p185BCR/ABL has a lower sensitivity than p210BCR/ABL to the allosteric inhibitor GNF-2 in Philadelphia chromosome-positive acute lymphatic leukemia

dc.contributor.authorMian, Afsar A.
dc.contributor.authorMetodieva, Anna
dc.contributor.authorNajajreh, Yousef
dc.contributor.authorOttmann, Oliver G.
dc.contributor.authorMahajna, Jamal
dc.contributor.authorRuthardt, Martin
dc.date.accessioned2018-09-05T11:33:01Z
dc.date.available2018-09-05T11:33:01Z
dc.date.issued2012-02-03
dc.description.abstractBackground 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 chromosomepositive 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.en_US
dc.identifier.citationMian AA, Metodieva A, Najajreh Y, Ottmann OG, Mahajna J, and Ruthardt M. p185BCR/ABL has a lower sensitivity than p210BCR/ABL to the allosteric inhibitor GNF-2 in Philadelphia chromosome-positive acute lymphatic leukemia. Haematologica 2012;97(2):251-257. doi:10.3324/haematol.2011.047191en_US
dc.identifier.issn1592-8721
dc.identifier.urihttps://dspace.alquds.edu/handle/20.500.12213/850
dc.language.isoen_USen_US
dc.publisherFerrata Storti Foundation (Italy)en_US
dc.subjectPhiladelphia chromosomeen_US
dc.subjectBCR/ABLen_US
dc.subjectallosteric inhibitionen_US
dc.subjectacute lymphatic leukemiaen_US
dc.subjectmolecular therapyen_US
dc.titlep185BCR/ABL has a lower sensitivity than p210BCR/ABL to the allosteric inhibitor GNF-2 in Philadelphia chromosome-positive acute lymphatic leukemiaen_US
dc.typeArticleen_US
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