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The Molecular, Cellular and Developmental Biology Program, and
Division of Bone Marrow Transplantation, The Ohio State University, Arthur G. James Cancer Hospital and Research Institute, Columbus, OH 43210
Activation of both positive and "negative" or anti-proliferative signals has emerged as a common paradigm for regulation of cell growth through cell surface receptors that regulate immune responses. SHP-1 and -2 and the novel 5'-inositol phosphatase SHIP have recently been shown to function as growth inhibitory molecules in immune receptor signaling. In the current study, we have identified distinct regions in the granulocyte colony-stimulating factor receptor (G-CSFR) distal to the conserved box 2 motif necessary for mitogenesis, which exert positive and negative influences on growth signaling in Ba/F3 pro-B lymphoid cells. The region spanning amino acids 682 to 715 mediates activation of phosphatidylinositol 3'(PI3)-kinase. Activation of PI3-kinase leads to inhibition of apoptosis, promotion of cell survival, and enhanced proliferative responses to G-CSF. We show that the region of 98 amino acids in the distal tail of the class I G-CSFR down-modulates proliferative signaling, not only in myeloid cell lines, as previously reported, but also in Ba/F3 cells. This same region recruits SHIP to the signaling cascade through a mechanism involving Shc, with the formation of Shc/SHIP complexes. Our data suggest a model in which PI3-kinase and SHIP coordinately regulate growth signaling through the G-CSFR.
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