Morphological comparison of DCLCs primed with or without IFIT4 over-expression by inverted microscope. Cell morphology changes were observed to evaluate the effects of IFIT4 on dendritic cell (DC) differentiation upon treatment with granulocyte-macrophage colony-stimulating factor (GM-CSF; 50 ng/ml) or IL-4 (20 ng/ml). (a) THP-1 cells were transfected with pEGFP-C1; 36 hours later cells were further stimulated with GM-CSF/IL-4 for 86 hours (left lane: ×20; right lane: ×40). (b) THP-1 cells were transfected with pEGFP-IFIT4 fusion plasmid; 36 hours later cells were further stimulated with GM-CSF/IL-4 for 48 hours (left lane: ×20; right lane: ×40). (c) Effect of IFIT4 on morphological changes that occured in monocytes differentiation into mature and activated DC-like cells (DCLCs). THP-1 cells were transfected with pEGFP-IFIT4 (left lane) or pEGFP-C1 (right lane) plasmid; 36 hours later cells were stimulated with GM-CSF/IL-4 for 6 days (left lane) or 12 days (right lane) followed by lipopolysaccharide (LPS; 100 ng/ml) for another 2 days. All the cells above were observed with an inverted microscope. More than three fields of view (containing ≥100 cells/field) per sample were examined. IFIT4, interferon-induced protein with tetratricopeptide repeats 4.