Abstract
Citral is a major compound of lemongrass (Cymbopogon citratus L.) that has many pharmacological activities such as anti-fungal and anti-bacterial effects. In this study, we investigated the anti-inflammatory effect of citral and defined its mechanism of action in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells. Citral (3-12 microg/mL) significantly inhibited LPS-induced nitric oxide (NO) production in a concentration-dependent manner (IC50: 6.5 microg/mL). Furthermore, it was found that citral effectively inhibited the transcriptional activity and expression of iNOS, and potently suppressed the DNA binding activity and nuclear translocation of NF-kappa B as well as I kappa B phosphorylation in a concentration dependent manner. These results suggest that citral is anti-inflammatory, and its effects may be due to the inhibition of NO production through the suppression of NF-kappa B activation.
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