Comparison of the phenotypic profiles of DCLCs primed with or without IFIT4 over-expression. (a) Surface antigens of normal THP-1 cells were examined by flow cytometry. (b) To analyze the effect of IFIT4 on phenotypic changes of dendritic cell-like cells (DCLCs) during the process of differentiation, THP-1 cells were transfected with pEGFP-IFIT4 or pEGFP-C1; 36 hours later, cells were stimulated with granulocyte-macrophage colony-stimulating factor (GM-CSF; 50 ng/ml) and IL-4 (20 ng/ml) for 90 hours to generate DCLCs. These DCLCs primed with pEGFP-IFIT4 or pEGFP-C1 transfection were incubated with fluorochrome-conjugated monoclonal antibodies (mAbs) and the antigens of CD40, CD80, CD86, CD83, HLA-DR, CD14 and CD1a on the surface of those DCLCs were analyzed by flow cytometry. Appropriate fluorochrome or isotype control mAbs of each antibody species were used as negative controls. Shaded histograms represent isotype control antibodies. The thick line represents DCLCs primed with pEGFP-IFIT4 transfection, whereas the slender lines represent DCLCs primed with pEGFP-C1 transfection. All experiments were performed three times and a set of representative histograms was presented. IFIT4, interferon-induced protein with tetratricopeptide repeats 4.