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Related Collections Hematopoiesis and Stem Cells Neoplasia Signal Transduction Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 1 May 2001, Vol. 97, No. 9, pp. 2846-2853 NEOPLASIA Down-regulation of interleukin-3/granulocyte-macrophage colony-stimulating factor receptor -chain in BCR-ABL+ human leukemic cells: association with loss of cytokine-mediated Stat-5 activation and protection from apoptosis after BCR-ABL inhibition Nicholas J. Donato, Ji Y. Wu, Ling Zhang, Hagop Kantarjian, and Moshe Talpaz From the Departments of Bioimmunotherapy and Leukemia, M. D. Anderson Cancer Center, University of Texas, Houston, TX. Several signaling cascades are engaged by expression of the p210 bcr-abl tyrosine kinase, and evidence suggests that these signals drive leukemogenesis. In this report, signaling pathways were examined and compared between cells derived from leukemic patients and cells expressing a bcr-abl construct (MBA). The effects of acute inhibition of bcr-abl with STI-571 on these signals and the survival of bcr-abl-expressing cells were also evaluated. Expression of bcr-abl in interleukin-3 (IL-3)/granulocyte-macrophage colony-stimulating factor (GM-CSF)-dependent Mo7e cells (MBA) resulted in growth factor independence, constitutive activation of Stat-5 phosphorylation, engagement of mitogen-activated protein (MAP) kinase signals, and increased expression of PTP1B and bcl-xL. STI-571 inhibited cell growth and induced apoptosis in bcr-abl-expressing cells (MBA, K562, BV-173, KBM5) but not in bcr-abl tumor cells (Mo7e, KG-1, ME-180, Daudi). STI-571-mediated apoptosis correlated with the inhibition of Stat-5 and MAP kinase activation and a reduction in overexpressed bcl-xL but not in PTP1B. Inhibitor had no effect on IL-3/GM-CSF-dependent Mo7e cell signaling and did not prevent activation of the other Jak/Stat pathways (interferon , IL-3/GM-CSF). However, neither IL-3 nor GM-CSF could reactivate Stat-5 after the STI-571-mediated inhibition of bcr-abl. Expression of the common -chain of the IL-3/GM-CSF receptor was down-regulated in Stat-5-activated myeloid leukemic cells, suppressing IL-3/GM-CSF signal transduction and the ability of these cytokines to provide apoptotic protection. These studies suggest that bcr-abl activates cytokine-independent mechanisms of survival while inactivating intrinsic cytokine signaling cascades, making bcr-abl+ myeloid cells vulnerable to apoptosis after bcr-abl inactivation. © 2001 by The American Society of Hematology.   CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: M. Benekli, H. Baumann, and M. Wetzler Targeting Signal Transducer and Activator of Transcription Signaling Pathway in Leukemias J. Clin. Oncol., September 10, 2009; 27(26): 4422 - 4432. [Abstract] [Full Text] [PDF] K. M. Heinonen, N. Dube, A. 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	Copyright © 2001 by American Society of Hematology         Online ISSN: 1528-0020