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Effect of PM2.5 on HUVEC and HMEC-1 apoptosis. (A) Cells were treated with 0–800 µg/ml PM2.5 for 24 h, then cell apoptosis was assessed by Annexin V-fluorescein isothiocyanate/propidium iodide assay. (B) Quantification of cell apoptosis. *P<0.05 vs. control group (0 µg/ml PM2.5). PM2.5, particulate matter with a diameter of ≤2.5 µm; HUVEC human umbilical vein endothelial cell; HMEC, human microvascular endothelial cell.
