In-vitro and in-vivo anti-inflammatory effect of oxyresveratrol from Morus alba L

• DOI: 10.1211/0022357022313
• Publication Date: 2004-01-13T22:33:58Z
• Authors: Kyung-Ook Chung; Bo-Young Kim; Myung-Hee Lee; Yeo-Ryun Kim; Hae-Young Chung; Jong-Hee Park; Jeon-Ok Moon
• Keywords: Inflammation; Male; 0301 basic medicine; Plant Extracts; Anti-Inflammatory Agents; Nitric Oxide Synthase Type II; Disaccharides; Antioxidants; Dinoprostone; Rats; Rats, Sprague-Dawley; 03 medical and health sciences; Stilbenes; Microsomes, Liver; Animals; Edema; Lipid Peroxidation; Morus; Plant Preparations; Nitric Oxide Synthase; Cells, Cultured; Phytotherapy

Abstract The antioxidative effects of mulberroside A and oxyresveratrol obtained from Mori Cortex were examined. Mulberroside A and oxyresveratrol showed an inhibitory effect against FeSO4/H2O2-induced lipid peroxidation in rat microsomes and a scavenging effect on 1,1-diphenyl-2-picrylhydrazyl radical. The anti-inflammatory effects of mulberroside A and oxyresveratrol using the carrageenin-induced model of inflammation were investigated in rats. Mulberroside A and oxyresveratrol significantly reduced paw edema. To investigate the mechanism of the anti-inflammatory action of these compounds, we examined the effects of oxyresveratrol on lipopolysaccharide (LPS)-induced responses in murine macrophage cell line RAW 264.7. Exposure of LPS-stimulated cells to oxyresveratrol inhibited nitrite accumulation in the culture medium. Oxyresveratrol also inhibited the LPS-stimulated increase of inducible nitric oxide synthase (iNOS) expression in a concentration-dependent manner; however, it had little effect on iNOS enzyme activity, suggesting that the inhibitory activity of oxyresveratrol is mainly due to the inhibition of iNOS expression rather than iNOS enzyme activity. Oxyresveratrol significantly inhibited LPS-evoked nuclear translocation of NF-kB and cyclooxygenase-2 (COX-2) activity in RAW 264.7 cells. The results suggest that the anti-inflammatory properties of oxyresveratrol might be correlated with inhibition of the iNOS expression through down-regulation of NF-kB binding activity and significant inhibition of COX-2 activity.