In conclusion, the ethanol extract of O. aristatus and its bioactive compound (ursolic acid) are able to inhibit LPSstimulated NO, PGE2 and intracellular ROS production in RAW 264.7 cells. We observed that EEOA and ursolic acid are also able to inhibit protein and mRNA expression of iNOS and COX-2 in the LPS-stimulated RAW264.7 cells. Taken together,
the ethanol extract of O. aristatus may provide a beneficial effect for inflammatory-mediated diseases.