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• W2076345712 abstract "The recruitment of endothelial progenitor cells (EPC) to ischemia has recently been suggested as an important mechanism of tissue repair. Although tissue ischemia can facilitate EPC mobilization, recruitment, and retention at the hypoxic site, the effects of hypoxia on EPC survival are not well known. In the present study, we examined whether hypoxia (2% O2) would suppress apoptosis induced by serum withdrawal and whether survival signals, such as the phosphatidylinositol 3-kinase (PI3K)/Akt and extracellular signal-regulated protein kinase (ERK) pathways, were involved in this process.After being serum-starved for 24 h, EPC were cultured under normoxic or hypoxic conditions (2% O2) for 24 h. Cell survival was assessed by 3-(4,5- dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, annexin V-propidium iodide dual-color flow cytometry, and terminal deoxynucleotidyl transferase-mediated digoxigenin-dUTP nick-end labeling assay. The expressions of signaling proteins were evaluated by Western blot analysis.Under hypoxic conditions, EPC were resistant to apoptosis induced by serum starvation. The inhibition of the PI3K/Akt pathway using the LY294002 inhibitor prevented hypoxia-inhibited apoptosis in EPC and altered the phosphorylation state of glycogen synthase kinase-3beta, an effector protein involved in regulation of EPC apoptosis. However, ERK inhibitor PD98059 had no significant effect on cell survival.Our data demonstrated that hypoxia inhibited serum withdrawal-induced apoptosis in EPC, which might be associated with the activation of the PI3K/Akt pathway." @default.
• W2076345712 created "2016-06-24" @default.
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• W2076345712 date "2008-12-01" @default.
• W2076345712 modified "2023-10-18" @default.
• W2076345712 title "Hypoxia confers protection against apoptosis via the PI3K/Akt pathway in endothelial progenitor cells" @default.
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• W2076345712 doi "https://doi.org/10.1111/j.1745-7254.2008.00904.x" @default.
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