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    Activation of granulocyte-macrophage colony-stimulating factor and interleukin-3 receptor subunits in a multipotential hematopoietic progenitor cell line leads to differential effects on development.

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    Authors
    Evans, Caroline A
    Pierce, Andrew
    Winter, Sandra A
    Spooncer, Elaine
    Heyworth, Clare M
    Whetton, Anthony D
    Affiliation
    Department of Biomolecular Sciences, Leukaemia Research Fund Cellular Development Unit, Manchester, United Kingdom.
    Issue Date
    1999-09-01
    
    Metadata
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    Abstract
    Activation of specific cytokine receptors promotes survival and proliferation of hematopoietic progenitor cells but their role in the control of differentiation is unclear. To address this issue, the effects of human interleukin-3 (hIL-3) and human granulocyte-macrophage colony-stimulating factor (hGM-CSF) on hematopoietic development were investigated in hematopoietic progenitor cells. Murine multipotent factor-dependent cell-Paterson (FDCP)-mix cells, which can self-renew or differentiate, were transfected with the genes encoding the unique alpha and/or shared beta(c) human hIL-3 receptor (hIL-3 R) or hGM-CSF receptor (hGM R) subunits by retroviral gene transfer. Selective activation of hIL-3 Ralpha,beta(c) or hGM Ralpha,beta(c) transfects by hIL-3 and hGM-CSF promoted self-renewal and myeloid differentiation, respectively, over a range of cytokine (0.1 to 100 ng/mL) concentrations. These qualitatively distinct developmental outcomes were associated with different patterns of protein tyrosine phosphorylation and, thus, differential signaling pathway activation. The cell lines generated provide a model to investigate molecular events underlying self-renewal and differentiation and indicate that the alpha subunits act in combination with the hbeta(c) to govern developmental decisions. The role of the alpha subunit in conferring specificity was studied by using a chimeric receptor composed of the extracellular hIL-3 Ralpha and intracellular hGM Ralpha subunit domains. This receptor promoted differentiation in response to hIL-3. Thus, the alpha subunit cytosolic domain is an essential component in determining cell fate via specific signaling events.
    Citation
    Activation of granulocyte-macrophage colony-stimulating factor and interleukin-3 receptor subunits in a multipotential hematopoietic progenitor cell line leads to differential effects on development. 1999, 94 (5):1504-14 Blood
    Journal
    Blood
    URI
    http://hdl.handle.net/10541/91379
    PubMed ID
    10477674
    Type
    Article
    Language
    en
    ISSN
    0006-4971
    Collections
    All Paterson Institute for Cancer Research

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