title: Biphasic response of endothelial progenitor cell proliferation induced by high glucose and its relationship with reactive oxygen species.
abstract: In this study, the effect of high glucose (HG) on endothelial progenitor cell (EPC) proliferation and its relationship with cyclins and reactive oxygen species (ROS) were investigated. Mouse EPCs were isolated from bone marrow using a magnetic activated cell-sorting system and cultured in the presence or absence of HG (30 mmol/l). We found that in the early stage of incubation (3 days), HG promoted cell proliferation, and increased the expressions of cdk2 and cyclin E, while in the late stage of culture (7 days) it inhibited cell proliferation and decreased the expressions of cdk2, cyclin E, and proliferating cell nuclear antigen (PCNA). Moreover, on the third day after incubation, HG significantly inhibited the apoptosis of EPCs, while in the late stage it markedly activated caspase-3 and promoted apoptosis. ROS generation in cells and maleic dialdehyde level in medium were significantly increased in HG group on the seventh day, whereas the expressions of superoxide dismutase and glutathione levels decreased. Tempol, a membrane-permeable radical scavenger, significantly inhibited ROS production in EPCs and partially reversed the HG-mediated inhibition of EPCs proliferation on the seventh day. We hypothesize that in the HG environment, the biphasic response of EPC proliferation may be related to the generation of ROS, which causes modulation of cyclins and cell cycle effect.
authors.affiliation: Department of Physiology and Pathophysiology, Institutes of Biomedical Sciences, Fudan University, PO Box 224, Shanghai 200032, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Xin-Hong
authors.initials: XH
authors.lastname: Wang
authors.forename: Si-Feng
authors.initials: SF
authors.lastname: Chen
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Zhang
authors.forename: Ning
authors.initials: N
authors.lastname: Lu
authors.forename: Ren-Ming
authors.initials: RM
authors.lastname: Hu
authors.forename: Hui-Ming
authors.initials: HM
authors.lastname: Jin
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D053148:Caspase 3 / Q000378:metabolism; D002452:Cell Count; D002453:Cell Cycle / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D003497:Cyclic N-Oxides / Q000494:pharmacology; D019927:Cyclin E / Q000032:analysis; D042783:Endothelial Cells / Q000166:cytology*; D005947:Glucose / Q000494:pharmacology*; D008315:Malondialdehyde / Q000032:analysis; D051379:Mice; D008807:Mice, Inbred BALB C; D017382:Reactive Oxygen Species / Q000378:metabolism*; D013113:Spin Labels; D013234:Stem Cells / Q000502:physiology*
chemical_list: D003497:Cyclic N-Oxides; D019927:Cyclin E; D017382:Reactive Oxygen Species; D013113:Spin Labels; D008315:Malondialdehyde; D053148:Caspase 3; D005947:Glucose; C001803:tempol