FIG. 3.
Role of pili in modulating cytokine production by human meningioma cells. Meningothelial meningioma cells were challenged with the following concentrations of piliated (Pil+) and nonpiliated (Pil−) strain MC58: 2.5 × 102 CFU per monolayer □, 2.5 × 104 CFU per monolayer ▵, 2.5 × 106 CFU per monolayer ○, and 2.5 × 108 CFU per monolayer ▪. Control wells contained culture medium alone ♦. The data are the mean levels of cytokine and chemokine secretion in triplicate wells, and the error bars indicate the standard deviations.