Overcoming kinase resistance in chronic myeloid leukemia

The International Journal of Biochemistry & Cell Biology
Francis Y LeeMaurizio Voi

Abstract

Imatinib is a small-molecule inhibitor of BCR-ABL tyrosine kinase activity, with proven efficacy and tolerability. Despite imatinib's activity, the development of resistance, whether BCR-ABL dependent or independent, is a concern. BCR-ABL-dependent resistance is commonly a result of mutations in the BCR-ABL gene, which can induce a structural predisposition towards the active conformation of the protein, resulting in a shift in the equilibrium of BCR-ABL from inactive, which imatinib binds, to active, which imatinib is unable to bind. BCR-ABL gene amplification may play a role in the development of imatinib resistance in patients with CML. There are a number of BCR-ABL-independent mechanisms of imatinib resistance, including the efflux protein multidrug resistance protein-1, of which imatinib is a substrate. Another mechanism may be the development of alternative pathways of disease progression, leading to less reliance on BCR-ABL; indeed, the SRC family tyrosine kinases LYN and HCK have been frequently implicated in treatment resistance and progression of CML. Clearly, imatinib resistance requires the development of other treatment options. Dasatinib, with increased binding potency (325-fold greater potency than imatinib for w...Continue Reading

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