The hypoxia/reoxygenation (HR) model was established as described previously (22). Specifically, when the cell density reached about 70%, cells were relocated to a tri-gas incubator with an atmosphere of 94% N2, 5% CO2, and 1% O2 and subsequently cultured with Earle's medium without glucose and FBS for 6 h to establish hypoxia. At the end of the incubation, the medium was replaced with DMEM supplemented with 10% FBS, and cells were transferred to CO2 incubator with an atmosphere of 5% CO2 for 3-h reoxygenation.
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