Abstract
The Abl kinase inhibitor imatinib mesylate is the preferred treatment for Philadelphia chromosome–positive (Ph+) chronic myeloid leukemia (CML) in chronic phase but is much less effective in CML blast crisis or Ph+ B-cell acute lymphoblastic leukemia (B-ALL). Here, we show that Bcr-Abl activated the Src kinases Lyn, Hck and Fgr in B-lymphoid cells. BCR-ABL1 retrovirus-transduced marrow from mice lacking all three Src kinases efficiently induced CML but not B-ALL in recipients. The kinase inhibitor CGP76030 impaired the proliferation of B-lymphoid cells expressing Bcr-Abl in vitro and prolonged survival of mice with B-ALL but not CML. The combination of CGP76030 and imatinib was superior to imatinib alone in this regard. The biochemical target of CGP76030 in leukemia cells was Src kinases, not Bcr-Abl. These results implicate Src family kinases as therapeutic targets in Ph+ B-ALL and suggest that simultaneous inhibition of Src and Bcr-Abl kinases may benefit individuals with Ph+ acute leukemia.
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Acknowledgements
We thank C. Lowell for Lyn−/− Hck−/− Fgr−/− mice; A. Wood and P. Lassota for discussions; K. Paigen, B. Tennent and S. Sampson for critically reading the manuscript; and P. Cherry for the secretarial assistance. This work was supported by the institutional funds from The Jackson Laboratory and grants from the Irving A. Hansen Foundation and The V Foundation for Cancer Research to S.L., who is a Scholar of The V Foundation for Cancer Research, and by a grant from the US National Institutes of Health and a Leukemia and Lymphoma Society SCOR grant to R.A.V., who is a Stohlman Scholar of the Leukemia and Lymphoma Society.
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Hu, Y., Liu, Y., Pelletier, S. et al. Requirement of Src kinases Lyn, Hck and Fgr for BCR-ABL1-induced B-lymphoblastic leukemia but not chronic myeloid leukemia. Nat Genet 36, 453–461 (2004). https://doi.org/10.1038/ng1343
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DOI: https://doi.org/10.1038/ng1343