Figure 2.

Cytotoxic effect of PDJ on RAW264.7 cells. RAW264.7 cells were pretreated with or without LPS (1 µg/ml) at 37°C for 1 h and then subsequently treated with PDJ (0, 0.5, 1, 2.5, 5 or 10 µg/ml) at 37°C for 24 h. (A) Effect of PDJ on non-LPS-induced cell viability in RAW264.7 cells. (B) Effect of PDJ on LPS-induced cell viability in RAW264.7 cells. Data are presented as the mean ± SEM of three independent experiments. **P<0.005 vs. LPS-only treated group. PDJ, polyphenolic extract from the Dowijigi flower; LPS, lipopolysaccharide.