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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Expression of the GM-CSF gene after retroviral transfer in hematopoietic stem cell lines induces synchronous granulocyte-macrophage differentiation.

Multipotent murine stem cell lines (FDC-Pmix) depend on IL-3 for self-renewal and proliferation and can be induced to differentiate into multiple hematopoietic lineages. Single FDC-Pmix cells infected with retroviral vectors expressing GM-CSF are induced to differentiate into granulocytes and macrophages. This results in a complete loss of clonogenic cells if IL-3 is not exogenously supplied; however, multipotent variants can be selected that do not terminally differentiate if cells are kept in the presence of IL-3. Unidirectional and synchronous granulocyte and macrophage differentiation accompanied with loss of self-renewal capacity is induced when IL-3 is removed. Our data indicate that activation of the GM-CSF receptor induces differentiation of stem cells by an instructive mechanism that can be blocked by the activated IL-3 receptor. A model of how receptors can induce proliferation and cell-specific differentiation by two separate pathways is discussed.[1]


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