Fig. 2
The cytotoxic effects of CS extract on human lung cancer cells. A549 cells were treated with different concentrations of CS extract (50–900 ng/mL) for 24 (a), 36 (b) and 48 (c) h and the percentages of viable cells were determined using MTT assay. The time and dose dependent manner of decreased cell viability is observed following CS treatment. The increasing concentrations of AM630 reduced the rate of cell death induced by CS extract (d). Data represent mean ± SD of three separate experiments. The statistical differences between treated and untreated groups were analyzed by ANOVA and are indicated by asterisks (* = P < 0.05, ** = P < 0.01, *** = P < 0.001, **** = P < 0.0001)