In vitro effects of G-CSF on IFN-γ and IL-4 production.

After exposure to G-CSF and polyclonal stimulation with PHA, IL-4 and IFN-γ expression were determined using flow cytometry as previously described. The columns represent the percentages (mean ± SEM) of cells expressing IFN-γ and IL-4. Summary of 13 experiments performed. Statistical analysis (nonparametric Kruskal-Wallis test) for IL-4:P < .01. Statistical analysis for IFN-γ:P < .01.