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Furthermore, many of the biological properties of flavonoids are likely to be related to their antioxidant and free-radical scavenging abilities. Accordingly, in the present study, we investigated whether kaempferol (a flavonol) protects beta cells from dRib-induced oxidative damage. HIT-T15 cells were cultured with various concentrations of dRib for 24h. Cell survivals, amounts of reactive oxygen species (ROS) generated, apoptosis, and lipid peroxidation were measured. dRib was found to dose-dependently reduce cell survival and to markedly increase intracellular ROS levels, apoptosis, and lipid peroxidation. However, kaempferol (10??M) suppressed dRib (20?mM) induced intracellular ROS, apoptosis, and lipid peroxidation. So, we demonstrate that kaempferol reduces dRib-mediated beta cell damage interfering with ROS metabolism and protective effects against lipid peroxidation. Our findings http://www.selleck.cn/products/blu9931.html indicate that kaempferol protects HIT-T15 cells from dRib-induced http://www.selleckchem.com/products/Bortezomib.html associated oxidative damage. Copyright ? 2009 John Wiley & Sons, Ltd. ""Ginkgo biloba extracts (GBE) have long been used as a traditional herbal medicine for treating central nervous system diseases and peripheral vascular diseases, but the underlying mechanisms have yet to be elucidated. Furthermore, traditional GBE is in the form of microsomes and only dissolves in organic solvents; its clinical applications have been greatly limited. Therefore, in the present study, nanometer http://www.selleckchem.com/products/gsk1120212-jtp-74057.html GBE (nGBE) was prepared utilizing supercritical anti-solvent (SAS) upon CO2-supercritical fluid extraction (CO2-SPF). Using whole-cell patch clamp techniques, the effects of different preparations of GBE on N-methyl-D-aspartate (NMDA)-activated currents (INMDA) from acutely isolated rat hippocampal neurons were investigated and the difference in protective potency between nGBE and mGBE evaluated. The results showed that the inward current activated by NMDA could be depressed by mGBE and nGBE. The inhibitory rates were 40% �� 17% and 64% �� 15%, and the half-inhibition concentrations (IC50) were 0.0210 �� 0.0055 and 0.0262 �� 0.0038?mg/mL, respectively. In comparison, the modulatory effect of nGBE (dissolved in extracellular solution) on NMDA-activated current was significantly greater than that of mGBE (dissolved in DMSO) (p