Chrysin (5,7-Dihydroxyflavone) is an active flavonoid isolated from Scutellariae Radix which has been used to treat pneumonia, laryngopharyngitis, jaundice, shigellosis, and breast mass in Korea, China, and Japan. Chrysin has been already reported to inhibit inducible nitric oxide synthase and cyclooxygenase-2 in lipopolysaccharideinduced macrophages. However, the effect of chrysin on virus-induced macrophages is not fully reported. In this study, the anti-inflammatory effect of chrysin on doublestranded RNA (dsRNA)-induced macrophages was examined. Production of Nitric oxide (NO), various cytokines, as well as calcium release and mRNA expression of CHOP and Fas in dsRNA [polyinosinic-polycytidylic acid]-induced RAW 264.7 mouse macrophages were evaluated. Chrysin restored the cell viability in dsRNA [polyinosinicpolycytidylic acid]-induced RAW 264.7 mouse macrophages at concentrations of up to 50 μM. Chrysin significantly inhibited the production of NO, IL-1α, IL-1β, IL-6, IL-10, IP-10, G-CSF, GM-CSF, LIF, LIX/CXCL5, MCP-1, MCSF, MIP-1α, MIP-1β, MIP-2, RANTES, TNF-α, and VEGF as well as calcium release and mRNA expression of CHOP and Fas in dsRNA [polyinosinic-polycytidylic acid]-induced RAW 264.7 mouse macrophages (P< 0.05). These data suggest that chrysin has anti-inflammatory properties related with its inhibition of nitric oxide, cytokines, chemokines, and growth factors in dsRNA-induced macrophages via the ER stress-CHOP pathway.
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Lee, J.Y., Park, W. Anti-inflammatory effect of chrysin on RAW 264.7 mouse macrophages induced with polyinosinic-polycytidylic acid. Biotechnol Bioproc E 20, 1026–1034 (2015). https://doi.org/10.1007/s12257-015-0416-2