Fig. 1.

Effects of dust extract (DE) on the viability of Beas2B and normal human bronchial epithelial (NHBE) cells. Beas2B (A) and NHBE (B) cells were treated with medium [control (Ctrl)] or the indicated concentrations of DE for 3 h. Cell viability was determined by 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) assay. Absorbance in control cells was arbitrarily considered as 100, and relative levels in treated cells are shown. Data shown are means ± SE (Beas2B, n = 3–5, except n = 2 for 0.5% DE; NHBE, n = 4); ns, not significant by one-way analysis of variance using Tukey’s multiple-comparison test.