Anti-inflammatory Activity of Lindera erythrocarpa Fruits

In this study, in vitro and in vivo anti-inflammatory activities of fruits from Lindera erythrocarpa Makino were evaluated. The ethyl acetate soluble fraction derived from the ethanol extract of L. erythrocarpa fruits inhibited significantly nitric oxide (NO) production in lipopolysaccharide (LPS) induced NO in the murine macrophage cell line (RAW264.7) assay, the EC50 being16.35μg/mL. Four compounds, including lucidone (1), cis/trans-methylludicone (2), methyl linderone (3) and linderone (4) were identified from the active fraction based on the bioactivity-guided fractionation procedure. Of these lucidone possessed the strongest NO inhibitory activity with an EC50 value of 4.22μg/mL. Furthermore, results from the protein expression assay demonstrated that lucidone suppressed iNOS and COX-2 protein expression in a dose-dependent manner. Lucidon also provided antiinflammatory activity in the croton oil-induced ear edema assay. When it was applied topically at a dosage of 0.5 and 1 mg per ear, the percent edema reduction on treated mice was 44％ and 25％, respectively. The results obtained in this study indicated that lucidone has a good potential to be developed as an antiinflammation agent.