Protective effect of hyperoside against hydrogen peroxide-induced dysfunction and oxidative stress in osteoblastic...

Oxidative stress can induce apoptosis and decrease activities of osteoblasts. Hyperoside (HYP) is a potent antioxidant derived from Chinese herb. This study aims to evaluate the protective effects provided by HYP to osteoblastic MC3T3-E1 cells. MC3T3-E1 cells were pre-treated with HYP for 24 h before being treated with 0.3 mM hydrogen peroxide (H₂O₂) for 24 h. Cell viability, flow cytometric analysis and mRNA expression of alkaline phosphatase (ALP), collagen I (COL-I) and osteocalcin (OCN) in MC3T3-E1 cells were examined. We next examined apoptosis-related and mitogen-activated protein kinase (MAPK) related proteins in HYP and H₂O₂ groups. HYP over the dose of 40 μmol/L could obviously increase the MC3T3-E1 cell viability at 24 h and 48 h (p < .05). HYP significantly (p < .05) increased mRNA expression of ALP, COL-I and OCN than H₂O₂ group. Moreover, HYP decreased the apoptosis rate and apoptosis-related proteins that induced by H₂O₂. In addition, HYP decreased the production of phosphorylated Jun N-terminal kinase (JNK) and p38 levels of osteoblastic MC3T3-E1 cells induced by H₂O₂. These results demonstrated that the protective effect provided by HYP to osteoblastic MC3T3-E1 cells was mediated, at least in part, via inhibition of MAPK signalling pathway and oxidative damage of the cells.