Figure 4
Secretion of GM-CSF by 16HBE cells exposed for 24 hrs to 10 μg/cm2 of the different size-fractions (UF: PM 0.03–0.17 , F: PM 0.17–1 , I: PM 1–2.5 and C: PM 2.5–10 ) in the presence (dashed bars) or absence (plain bars) of a recombinant endotoxin neutralizing protein (rENP). Data from four size-segregated aerosol samplings (W2, W4, S6, S7) were pooled. n = 55 for control, n = 8 for each size-fraction. * different from control (p < 0.05), ≠ significant difference between the presence or not of rENP.