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(+)-Usnic acid (UA) enhances paclitaxel cytotoxicity in LUSC cells. (A) Cell viability assessed by MTT after treatment with PTX at the indicated concentrations, n = 3. (B) The effect of UA plus PTX on H520 and Calu-1 cell viability determined by MTT assay. H520 and Calu-1 cells were exposed to different concentration of UA and PTX for 48 h. Significantly different from control group, * p < 0.05, n = 3; # significantly different from the group of UA or PTX, p < 0.05, n = 3.
