Abstract
In our ongoing search for anti-inflammatory agents originating from Korean medicinal plants, we found that the hexane and BuOH fractions of the MeOH extract from the whole plants of Melandrium firmum Rohrbach inhibited 5-lipoxygenase (5-LOX) activity. By activity-guided fractionation, eleven compounds, alpha-spinaterol (1), ursolic acid (2), ergosterol peroxide (3), alpha-spinaterol glucoside (4), 2-methoxy-9-beta-D-ribofuranosyl purine (5), aristeromycin (6), ecdysteron (7), polypodoaurein (8), (-)-bornesitol (9), mannitol (10) and cytisoside (11) were isolated from the hexane and BuOH fractions using column chromatography. Compounds 2, 5, 6, 8, 9, 10 and 11 were isolated for the first time from this plant. Compounds 1, 3, 4 and 7 inhibited 5-LOX activity with IC50 values of 21.04 microM, 42.30 microM, 32.82 microM, and 17.18 microM, respectively.
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