Figure 3

Cytokine levels in BALF of mice at 4 hr and 24 hr post-exposure to ENM (100 μg) by oropharyngeal aspiration. (A) IL-6, (B) MIP-2, and (C) TNF-α concentrations in BALF. Data are means ± SEM (n =5-6 in each group). *p <0.05 compared with the saline-exposed negative control group from the same time point. Mice exposed to 2 μg of LPS served as a positive control.