Inhibitory effect of oxycoumarins isolated from the Thai medicinal plant Clausena guillauminii on the inflammation mediators, iNOS, TNF-α, and COX-2 expression in mouse macrophage RAW 264.7

• DOI: 10.1007/s11418-008-0277-5
• Publication Date: 2008-07-17T21:04:43Z
• Authors: Tomonori Nakamura; Naoko Kodama; Yu Arai; Takuya Kumamoto; Yoshihiro Higuchi; Chaiyo Chaichanti...; Tsutomu Ishikawa; Koichi Ueno; Shingo Yano
• Keywords: 0301 basic medicine; Plants, Medicinal; Tumor Necrosis Factor-alpha; Macrophages; Blotting, Western; Clausena; Nitric Oxide Synthase Type II; Nitric Oxide; Cell Line; 3. Good health; Mice; 03 medical and health sciences; Coumarins; Cyclooxygenase 2; Animals; Inflammation Mediators

In the present study, we investigated the inhibitory effect of the known oxycoumarins poncitrin (3), osthol (4), and xanthoxyletin (5), newly isolated from Clausena guillauminii (Rutaceae), together with the known carbazoles heptaphylline (1) and 7-methoxyheptaphylline (2) on inducible-nitric oxide synthase (iNOS) expression induced by lipopolysaccharide (LPS) and the NO generation in RAW 264.7 mouse macrophages. Isolation of active oxycoumarins was guided by Western blot analysis of iNOS protein expression. These oxycoumarins showed an inhibitory effect on iNOS protein expression at 10 microM. Further examination of the inhibitory effects of these compounds on inflammation mediators revealed that the synthesis of nitric oxide (NO) and the protein expression of tumor necrosis factor-alpha (TNF-alpha) and cyclooxygenase-2 (COX-2) were inhibited by 5. It was expected that these compounds show anti-inflammatory activities.