Protective effect of irisolidone, a metabolite of kakkalide, against hydrogen peroxide induced cell damage via antioxidant effect

The protective properties of irisolidone (a metabolite of kakkalide by intestinal bacteria) against hydrogen peroxide (H2O2) induced cell damage were investigated. Irisolidone was found to scavenge 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, and the intracellular reactive oxygen species (ROS), thereby preventing lipid peroxidation and DNA damage. Irisolidone inhibited apoptosis in Chinese hamster lung fibroblast (V79-4) cells induced by H2O2 via radical scavenging activity. This was achieved by the activation of the extracellular signal regulated kinase (ERK) and DNA binding activity of activator protein-1 (AP-1) (a downstream transcription factor of ERK) by irisolidone. (c) 2007 Elsevier Ltd. All rights reserved.