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

SOCS3 is a critical physiological negative regulator of G-CSF signaling and emergency granulopoiesis.

To determine the importance of suppressor of cytokine signaling-3 (SOCS3) in the regulation of hematopoietic growth factor signaling generally, and of G-CSF-induced cellular responses specifically, we created mice in which the Socs3 gene was deleted in all hematopoietic cells. Although normal until young adulthood, these mice then developed neutrophilia and a spectrum of inflammatory pathologies. When stimulated with G-CSF in vitro, SOCS3-deficient cells of the neutrophilic granulocyte lineage exhibited prolonged STAT3 activation and enhanced cellular responses to G-CSF, including an increase in cloning frequency, survival, and proliferative capacity. Consistent with the in vitro findings, mutant mice injected with G-CSF displayed enhanced neutrophilia, progenitor cell mobilization, and splenomegaly, but unexpectedly also developed inflammatory neutrophil infiltration into multiple tissues and consequent hind-leg paresis. We conclude that SOCS3 is a key negative regulator of G-CSF signaling in myeloid cells and that this is of particular significance during G-CSF-driven emergency granulopoiesis.[1]

References

  1. SOCS3 is a critical physiological negative regulator of G-CSF signaling and emergency granulopoiesis. Croker, B.A., Metcalf, D., Robb, L., Wei, W., Mifsud, S., DiRago, L., Cluse, L.A., Sutherland, K.D., Hartley, L., Williams, E., Zhang, J.G., Hilton, D.J., Nicola, N.A., Alexander, W.S., Roberts, A.W. Immunity (2004) [Pubmed]
 
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