Anti-inflammatory and anti-oxidative activities of polyacetylene from Dendropanax dentiger.

Dendropanax dentiger has been used as a folk medicine since ancient times. In our current study, we observed that D. dentiger exhibited a significant anti-inflammatory activity, which could efficiently inhibit nitric oxide (NO) production in the lipopolysaccharide (LPS)-induced macrophage inflammation assay. (9Z,16S)-16-Hydroxy-9,17-octadecadiene-12,14-diynoic acid (HODA) was isolated from the leaves of D. dentiger following a bioactivity guided fractionation protocol. Our data indicated that HODA significantly inhibited the NO production in LPS-induced RAW 264.7 murine macrophage cells (IC50 = 4.28 μM). Consistent with these observations, the mRNA and protein expression levels of iNOS were also inhibited by HODA in a dose-dependent manner. HODA also reduced the translocation of NF-κB into nuclear fractions. Meanwhile, HODA enhanced Nrf-2 activation and its downstream antioxidant gene HO-1. We concluded that HODA possessed significant anti-inflammatory and anti-oxidative activity; the compound may have a potential for development as a chemoprevention agent.