title: A tocotrienol-rich fraction from grape seeds inhibits oxidative stress induced by tert-butyl hydroperoxide in HepG2 cells.
abstract: We evaluated the protective effect of a tocotrienol-rich fraction (TRF) from grape seeds on tert-butyl hydroperoxide (TBHP)-induced oxidative injury in HepG2 cells. Generation of cellular reactive oxygen species (ROS), concentrations of cellular lipid peroxidation products and reduced glutathione, and antioxidant enzyme activity were used as biomarkers of cellular oxidative status. Cells pretreated with TRF (10–500 μg/mL) showed an increased resistance to oxidative stress in a dose-dependent manner, as revealed by a higher percentage of surviving cells compared to control cells. Pretreatment with TRF (5–100 μg/mL) prevented the decrease in reduced glutathione and the increase in malondialdehyde and ROS evoked by TBHP in HepG2 cells. Moreover, TRF pretreatment prevented a significant increase in glutathione peroxidase, catalase, and superoxide dismutase activities induced by TBHP. These results show that TRF has significant protective ability against TBHP-induced oxidative insult and that the modulation of antioxidant enzymes by TRF may have an important antioxidant effect on HepG2 cells.
authors: Department of Food Science and Technology, College of Agriculture, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea.
authors: Youngmin
authors: Y
authors: Choi
authors: Seon-Mi
authors: SM
authors: Lee
authors: Younghwa
authors: Y
authors: Kim
authors: Jaemin
authors: J
authors: Yoon
authors: Heon-Sang
authors: HS
authors: Jeong
authors: Junsoo
authors: J
authors: Lee
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D002374:Catalase / Q000378:metabolism; D005978:Glutathione / Q000032:analysis; D005979:Glutathione Peroxidase / Q000378:metabolism; D056945:Hep G2 Cells; D006801:Humans; D015227:Lipid Peroxidation / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects*; D010936:Plant Extracts / Q000494:pharmacology*; D017382:Reactive Oxygen Species / Q000378:metabolism; D012639:Seeds / Q000737:chemistry*; D013482:Superoxide Dismutase / Q000378:metabolism; D024508:Tocotrienols / Q000008:administration & dosage / Q000032:analysis*; D027843:Vitis / Q000737:chemistry*; D020122:tert-Butylhydroperoxide / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D017382:Reactive Oxygen Species; D024508:Tocotrienols; D020122:tert-Butylhydroperoxide; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005978:Glutathione