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- W2132000672 abstract "COX-2 (Cyclooxygenase-2) and iNOS (inducible nitric oxide synthase) are involved in various pathophysiological processes such as inflammation. In a search for inhibitors of COX-2 and iNOS, we found that extracts of Dictyota dichotoma inhibit Nitric oxide (NO) and PGE2 generation in LPS-stimulated RAW 264.7 macrophage cells, as well as levels of iNOS and COX-2 mRNA and protein.D. dichotoma were extracted with 80% EtOH. The extract was then partitioned with hexane, CH2Cl2, EtOAc, BuOH, and water, successively. The results indicate that the CH2Cl2 fraction of D. dichotoma extract is an effective inhibitor of LPS-induced NO and PGE2 production in RAW 264.7 cells. These inhibitory effects of the CH2Cl2 fraction of D. dichotoma were accompanied by decreases in the expression of iNOS and COX-2 proteins and iNOS and COX-2 mRNA in dose-dependent pattern. To test the inhibition effects of D. dichotoma fractions on other cytokines, we also performed RT-PCR on TNF-α, IL-1β, and IL-6 in LPS-stimulated RAW 264.7 macrophage cells. In these assays, the CH2Cl2 fraction ofD. dichotoma also showed decreases in the expression of TNF-α, IL-1β, and IL-6 mRNA. Based on these results, we suggest that D. dichotoma extracts may be considered possible anti-inflammatory candidates for human health. Key words: COX-2, Cytokine, Dictyota dichotoma, inflammation, iNOS (inducible nitric oxide synthase), PGE2." @default.
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- W2132000672 date "2009-01-31" @default.
- W2132000672 modified "2023-10-07" @default.
- W2132000672 title "Anti-inflammatory activity of brown alga Dictyota dichotoma in murine macrophage RAW 264.7 cells" @default.
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- W2132000672 doi "https://doi.org/10.5897/jmpr.9000099" @default.
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