The effects of an antioxidative pentapeptide derived from chickpea protein hydrolysates on oxidative stress in Caco-2 and HT-29 cell lines

The effects of an antioxidative pentapeptide from chickpea protein hydrolysates on oxidative stress in Caco-2 and HT-29 cell lines were investigated. The bioactive pentapeptide had an amino acid sequence of Asn-Arg-Try-His-Glu (NRYHE). Caco-2 and HT-29 cells were pretreated with peptide (0.05, 0.1, 0.25 and 0.5 mg/mL) for 2 h and stimulated with 1 mM H2O2 for 6 h. The activity of three important antioxidative enzymes, catalase, glutathione reductase and glutathione peroxidase, increased in a concentration-dependent manner. It was observed that peptide treatment elevated the expression of Nrf2 mRNA and several relative genes NQO1, HO-1, gamma-GCS regulated by Nrf2 compared to the positive control. The trends in HT-29 and Caco-2 cells were similar. (C) 2013 Elsevier Ltd. All rights reserved.