FIG 1.

Assessment of cell viability of PC-12 cells following drug treatment by MTT assay. (A) Effects of increasing concentrations of PFT-α (0 nM to 80 nM) after 12 h of exposure. (B) Effects of colistin (125 μg/ml), PFT-α (20 nM), and colistin (125 μg/ml) plus PFT-α (20 nM) at the indicated times. Error bars represent standard deviations (SD) of the means (n = 5). **, P < 0.01 for treated groups versus the untreated control group; ##, P < 0.01 for the intergroup comparison among the treated groups.