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- W2078352512 abstract "Preconditioning describes a variety of treatments that induce neurons to become more resistant to a subsequent ischemic insult. How preconditioned neurons adapt to subsequent ischemic stress is not fully understood, but is likely to involve multiple protective mechanisms. We hypothesized hypoxic preconditioning induces protection by a coordinated up-regulation of antioxidant enzyme activity. To test this hypothesis, we developed two in vitro models of ischemia/reperfusion, involving oxygen-glucose deprivation (OGD) where neuronal cell death was predominantly by necrosis (necrotic model) or programmed cell death (PCD model). Hypoxic preconditioning 24 h prior to OGD significantly reduced cell death from 83% to 22% in the necrotic model and 68% to 11% in the PCD model. Consistent with the hypothesis, the activity of the antioxidant enzymes glutathione peroxidase, glutathione reductase, and Mn superoxide dismutase were significantly increased by 54%, 73% and 32%, respectively, in neuronal cultures subjected to hypoxic preconditioning. Furthermore, superoxide and hydrogen peroxide concentrations following OGD were significantly lower in the PCD model that had been subjected to hypoxic preconditioning." @default.
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- W2078352512 date "2004-08-01" @default.
- W2078352512 modified "2023-10-01" @default.
- W2078352512 title "The protective effect of hypoxic preconditioning on cortical neuronal cultures is associated with increases in the activity of several antioxidant enzymes" @default.
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- W2078352512 doi "https://doi.org/10.1016/j.brainres.2004.05.031" @default.
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