Inhibitory effects of three oleanolic acid glycosides from Achyranthes japonica on the complement classical pathway.

The present study evaluated the anticomplement effects of isolated compounds from Achyranthes japonica in the classical pathway of the complement system. Using column chromatography, three compounds: achyranthoside C dimethyl ester, achyranthoside C butyl dimethyl ester, and achyranthoside E dimethyl ester were isolated and evaluated for in vitro anticomplement activity. Achyranthoside C dimethyl ester showed the most potent inhibitory activity against the complement system, with 50% inhibitory concentrations (IC(50)) values of 26.2 µg/mL. This is the first report of anticomplement activity of isolated compounds from A. japonica.