Figure 4

Cytokine levels in lung tissue slices at 24 hr post-exposure to ENM (132 μg/mL). (A) IL-6, (B) MIP-2, and (C) TNF-α concentrations in the culture medium (CM) from the lung tissue slices. Data are means ± SEM (n =3 in each group). *p <0.05 compared with CM-exposed negative control group. Lung tissue slices exposed to 87 ng/mL of LPS served as a positive control.