Figure 7

Inhibition of NO release by O. labiatum extract and labdane diterpenoid. PBMCs were pre-incubated for 1 h with the indicated concentrations of the extract (OL) and compound (Lab) and then stimulated with 25 μg/mL PHA for 24 h. Untreated cells were used as a control. Nitrite accumulation was measured with the Griess reagent. Extract and compound concentrations used were non-toxic. The results were expressed as mean ± SD.