Fig. 8. Expressions of HIF-1α (A), and Nrf2 (B) after exposure of cells 6 h of IH or SH in our model of blood-brain barrier. Results are represented as mean value ± SEM (n=9, N=2), *** p≤0.001 compared to control condition. SH: sustained hypoxia, IH: intermittent hypoxia, control: normal atmospheric gas pressure, HIF-1α: hypoxia-inducible factor 1 alpha, Nrf2: nuclear factor erythroid 2-related factor 2.