The tyrosine kinase inhibitor (TKI) Imatinib is the gold standard in treatment of Bcr-Abl positive chronic myeloid leukemia (CML). Nevertheless the emergence of resistance to Imatinib remains a major problem. While searching for new active compounds against TKI-resistent CML, the small molecule inhibitors PHA-739358 and AS-703569 were identified, both of which target Bcr-Abl as well as the cell cyle kinases Aurora A - C. However, it has been unclear whether therapeutic activity is primarily mediated by functional inhibition of Bcr-Abl, Aurora kinases or a combination of both. In this work the biological effects of both dual inhibitors have been discerned in Bcr-Abl and Aurora kinase dependent effects by using kinetic cell proliferation studies and cell cycle analysis as well as developing a new experimental murine cell-system. Following this approach Aurora B and not Bcr-Abl was verified as the relevent in-vitro target of both compounds.
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The tyrosine kinase inhibitor (TKI) Imatinib is the gold standard in treatment of Bcr-Abl positive chronic myeloid leukemia (CML). Nevertheless the emergence of resistance to Imatinib remains a major problem. While searching for new active compounds against TKI-resistent CML, the small molecule inhibitors PHA-739358 and AS-703569 were identified, both of which target Bcr-Abl as well as the cell cyle kinases Aurora A - C. However, it has been unclear whether therapeutic activity is primarily med...
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