Figure 5.

P. lentiscus hydrosol lowers ROS, NO, and PGE₂ levels. U937/PMA cells were untreated (C) or activated with LPS alone (LPS) or in the presence of P.l 1 : 10 or P.l 1 : 100. (a, b) Following 24 hours, ROS and NO levels were evaluated and expressed as percentage of C (set at 100%). (c) The concentration of PGE₂ secreted into cell culture supernatants was measured after 48 hours of treatment. Means ± S.D. of four replicate independent experiments are shown. According to one-way ANOVA, differences in ROS (a), NO (b), and PGE₂ (c) levels were significant (p < 0.001). Therefore, Tukey's post hoc test was performed and different letters indicate significant differences between treatments at p < 0.05.