title: [Effect of sequoyitol on expression of NOX4 and eNOS induced with glucose in human umbilical vein endothelial cells].
abstract: OBJECTIVE
  To investigate the protective effect and mechanism of sequoyitol (Sep) on high glucose-induced human umbilical vein endothelial cells (HUVECs) injury.
  
  
  METHODS
  HUVECs were cultured with high glucose (30 mmol/L) in the presence or absence of sequoyitol (0.1, 1 and 10 micromol/L) for 24 h. Cell proliferation was measured by BrdU marking and cell cycle was detected by flow cytometry. 2', 7'-dichlorofluorescein diacetate was used to evaluate intracellular reactive oxygen species (ROS) levels. The NO, malonydialdehyde (MDA) and H2O2 levels were determined by colorimetric method according to the manufacturer's instructions. The expression of endothelial nitric oxide synthase (eNOS) and NADPH oxidase 4 (NOX4) were measured by real-time PCR and Western blot.
  
  
  RESULTS
  In the present study, we found that sequoyitol pretreatment for 1 h significantly decreased cell injury, promoted cell proliferation. Meanwhile sequoyitol significantly down-regulated NOX4 expression and decreased the level of ROS, MDA and H2O2 and obviously increased NO levels and up-regulated eNOS expression.
  
  
  CONCLUSIONS
  Sequoyitol alleviates high glucose-induced cell injuries in HUVECs via inhibiting oxidative stress and up-regulating eNOS expression.
authors.forename: Xian-Wei
authors.initials: XW
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Hao
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.forename: Jie-Ren
authors.initials: JR
authors.lastname: Yang
mesh_terms: D049109:Cell Proliferation; D002478:Cells, Cultured; D005947:Glucose / Q000633:toxicity; D061307:Human Umbilical Vein Endothelial Cells / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism; D007294:Inositol / Q000031:analogs & derivatives* / Q000494:pharmacology; D008315:Malondialdehyde / Q000378:metabolism; D000074663:NADPH Oxidase 4; D019255:NADPH Oxidases / Q000378:metabolism*; D052250:Nitric Oxide Synthase Type III / Q000378:metabolism*; D018384:Oxidative Stress; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: C572459:5-O-methyl-myo-inositol; D017382:Reactive Oxygen Species; D007294:Inositol; D008315:Malondialdehyde; D006861:Hydrogen Peroxide; C496314:NOS3 protein, human; D052250:Nitric Oxide Synthase Type III; D000074663:NADPH Oxidase 4; D019255:NADPH Oxidases; C498910:NOX4 protein, human; D005947:Glucose