G-CSF induced reactive oxygen species involves Lyn-PI3-kinase-Akt and contributes to myeloid cell growth

Quan Sheng Zhu, Ling Xia, Gordon B. Mills, Clifford A. Lowell, Ivo P. Touw, Seth J. Corey

Research output: Contribution to journalArticlepeer-review

107 Scopus citations

Abstract

Granulocyte colony-stimulating factor (G-CSF) drives the production, survival, differentiation, and inflammatory functions of granulocytes. Reactive oxygen species (ROSs) provide a major thrust of the inflammatory response, though excessive ROSs may be deleterious. G-CSF stimulation showed a time- and dosedependent increase in ROS production, correlating with activation of Lyn and Akt. Inhibition of Lyn, PI3-kinase, and Akt abrogated G-CSF-induced ROS production. This was also blocked by DPI, a specific inhibitor of NADPH oxidase. Following G-CSF stimulation, neutrophils from Lyn-/- mice produced less ROSs than wild-type littermates. G-CSF induced both serine phosphorylation and membrane translocation of p47phox, a subunit of NADPH oxidase. Because patients with a truncated G-CSF receptor have a high risk of developing acute myeloid leukemia (AML), we hypothesized that dysregulation of ROSs contributes to leukemogenesis. Cells expressing the truncated G-CSF receptor produced more ROSs than those with the full-length receptor. G-CSF-induced ROS production was enhanced in bone marrow-derived neutrophils expressing G-CSFR715, a truncated receptor. The antioxidant N-acetyl-L-cysteine diminished G-CSF-induced ROS production and cell proliferation by inhibiting Akt activation. These data suggest that the G-CSF-induced Lyn-PI3K-Akt pathway drives ROS production. One beneficial effect of therapeutic targeting of Lyn-PI3K-kinase-Akt cascade is abrogating ROS production.

Original languageEnglish (US)
Pages (from-to)1847-1856
Number of pages10
JournalBlood
Volume107
Issue number5
DOIs
StatePublished - Mar 1 2006
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology

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