title: [Effects of Ginkgo biloba extract 50 on hypoxia induced endothelial dysfunction].
abstract: OBJECTIVE
  To preliminarily investigate the influence of hypoxia on human umbilical vein endothelial cells (HUVECs), and the effect of Ginkgo biloba extract 50 (GBE50) on it.
  
  
  METHODS
  Flow cytometry, TUNEL, RT-PCR, Western blot, etc. were applied, to study the effect of hypoxia and GBE50 on endothelial cells.
  
  
  RESULTS
  After being interfered by hypoxia for 24 h, the levels of reactive oxygen species (ROS) in HUVECs and the apoptotic rate either in the early or in the late stage significantly increased, and accompanied with the increased levels of endothelin-1 mRNA (ET-1) and endothelial oxide synthase (eNOS) protein. However, when HUVECs were pretreated with GBE50 (25 [microg/ml) 4 h before hypoxia, the apoptotic rate in the early or late stage and expression of ET-1 mRNA significantly decreased (P < 0.05), and the heightened ROS level and eNOS expression partially decreased (P > 0.05).
  
  
  CONCLUSIONS
  Hypoxia can induce endothelial dysfunction, which could be partially or significantly reversed by GBE50, it shows a certain protective effect on hypoxia induced endothelial dysfunction.
authors.affiliation: Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai. jbge@zshospital.net
authors.forename: Jian-Ying
authors.initials: JY
authors.lastname: Shen
authors.forename: Ai-Jun
authors.initials: AJ
authors.lastname: Sun
authors.forename: Xiao-Mei
authors.initials: XM
authors.lastname: Gu
mesh_terms: D015153:Blotting, Western; D015687:Cell Hypoxia; D002478:Cells, Cultured; D004365:Drugs, Chinese Herbal / Q000494:pharmacology*; D042783:Endothelial Cells / Q000187:drug effects* / Q000378:metabolism; D019332:Endothelin-1 / Q000096:biosynthesis / Q000235:genetics; D004730:Endothelium, Vascular / Q000187:drug effects / Q000378:metabolism / Q000503:physiopathology; D016166:Free Radical Scavengers / Q000494:pharmacology; D020441:Ginkgo biloba / Q000737:chemistry*; D006801:Humans; D018515:Plant Leaves / Q000737:chemistry; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D017382:Reactive Oxygen Species / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D004365:Drugs, Chinese Herbal; D019332:Endothelin-1; D016166:Free Radical Scavengers; D012333:RNA, Messenger; D017382:Reactive Oxygen Species