Anti-inflammatory effects of 4-arylcoumarins in LPS-induced murine macrophage RAW 264.7 cells
Taechowisan, Thongchai（Department of Microbiology, Faculty of Science, Silpakorn University, Nakorn, Pathom, Thailand）
Lumyong, Saisamorn（Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand）
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This research was undertaken to find the in vitro inflammatory action of 5,7-dimethyloxy-4-p-methoxyl-phenylcoumarin and 5,7-dimethoxy-4-phenylcoumarin produced by Streptomyces aureofaciens CMUAc130. We investigated the effects of 5,7-dimethyloxy-4-p-methoxyl-phenylcoumarin and 5,7-dimethoxy-4-phenylcoumarin not only on the formation of NO, prostaglandin E-2 (PGE(2)), and tumor necrosis factor-alpha (TNF-alpha) but also on inducible nitric oxide synthase and cyclooxygenase-2 (COX-2) in lipopolysaccharide (LPS)-induced murine macrophage RAW 264.7 cells. The data obtained were consistent with the modulation of iNOS enzyme expression. A similar fashion was also observed when LPS-induced PGE(2) release and COX-2 expression were tested. The significant inhibitory effects were shown in concentration-dependent manners. In addition, 5,7dimethyloxy-4-p-methoxylphenylcoumarin and 5,7dimethoxy-4-phenylcoumarin also mildly but significantly reduced the formation of TNF-alpha. These findings support the application of 5,7-dimethyloxy-4-p-methoxylphenylcoumarin and 5,7-dimethoxy-4-phenylcoumarin as anti-inflammatory agents.
CitationPharmaceutical Biology . 2006;44(8),pp576-580