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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Growth and differentiation signals mediated by different regions in the cytoplasmic domain of granulocyte colony-stimulating factor receptor.
Cell 1993 September 25
Granulocyte colony-stimulating factor (G-CSF) is a cytokine that regulates the proliferation and differentiation of neutrophils. The G-CSF receptor (G-CSFR) is a member of the hemopoietic growth factor receptor family. A G-CSFR expression plasmid was introduced into interleukin-3 (IL-3)-dependent mouse myeloid precursor FDC-P1 cells that normally do not respond to G-CSF. G-CSF stimulated proliferation of the transformants, down-regulated Thy-1 and F4/80 antigens on the cell surface, and induced expression of neutrophil-specific genes such as myeloperoxidase (MPO) and leukocyte elastase. On the other hand, neither granulocyte/macrophage colony-stimulating factor (GM-CSF) nor IL-3 induced MPO gene expression, but they inhibited G-CSFR-mediated MPO gene expression. These results suggested that the G-CSFR, but not the IL-3/GM-CSF receptors, transduced the neutrophilic differentiation signal into cells. Mutational analysis of the G-CSFR indicated that the N-terminal region of its cytoplasmic domain is sufficient to transduce the proliferation signal into cells, while the C-terminal region plays an essential role in transducing the differentiation signal.
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