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¹ Department of Physiology and Pathophysiology, Shanghai Medical College² Institutes of Biomedical Sciences, Fudan University, PO Box 224, Shanghai 200032, China³ Department of Endocrinology, Institute of Endocrinology and Diabetology at Fudan University, Hua Shan Hospital, Fudan University, Shanghai 200040, China

(Correspondence should be addressed to H-M Jin; Email: hmjin{at}shmu.edu.cn; R-M Hu; Email: renminghu{at}fudan.edu.cn)

The authors declare that there is no conflict of interest that would prejudice its impartiality.

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.