Abstract
The basis for persistence of leukemic stem cells in the bone marrow microenvironment remains poorly understood. We present evidence that signaling cross-talk between α4 integrin and Abelson interactor-1 (Abi-1) is involved in the acquisition of an anchorage-dependent phenotype and drug resistance in Bcr-Abl-positive leukemia cells. Comparison of Abi-1 (ABI-1) and α4 integrin (ITGA4) gene expression in relapsing Bcr-Abl-positive CD34+progenitor cells demonstrated a reduction in Abi-1 and an increase in α4 integrin mRNA in the absence of Bcr-Abl mutations. This inverse correlation between Abi-1 and α4 integrin expression, as well as linkage to elevated phospho-Akt and phospho-Erk signaling, was confirmed in imatinib mesylate -resistant leukemic cells. These results indicate that the α4-Abi-1 signaling pathway may mediate acquisition of the drug-resistant phenotype of leukemic cells.
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Acknowledgements
We thank Dr Adam Lerner (Boston University), Dr Peter Quesenberry (Brown University), Dr T Papayannopoulou (University of Washington) and Dr Leszek Kotula (New York State University) for helpful discussions and Dr Tahereh Ziafazelli for technical assistance. We thank Dr Brian Druker and Dr Kara Johnson for providing us with the patient samples. This work received support from the National Center for Research Resources 5P20RR018757-10 and the National Institute of General Medical Sciences 8P20GM103414-10 (both to VF).
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Chorzalska, A., Salloum, I., Shafqat, H. et al. Low expression of Abelson interactor-1 is linked to acquired drug resistance in Bcr-Abl-induced leukemia. Leukemia 28, 2165–2177 (2014). https://doi.org/10.1038/leu.2014.120
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DOI: https://doi.org/10.1038/leu.2014.120
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