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(A) Representative Western blots and (B) relative density of toll−like receptor (TLR) 4 expression in artificial particulate matter (APM) and diesel exhaust particles (DEP)−stimulated alveolar macrophages (MH−S). Vehicle control (VC) was treated with cell medium including 10% distilled water. Data are presented as the means ± SD (n = 3 per group). ** p < 0.01 or *** p < 0.001 vs. VC; ## p < 0.01 vs. APM group; §§§ p < 0.001 vs. DEP group.
