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Journal Article
Research Support, Non-U.S. Gov't
Cellular death in hippocampus in response to PI3K pathway inhibition and oxygen and glucose deprivation.
Neurochemical Research 2005 March
We investigated the importance of the phosphoinositide3-kinase (PI3K) pathway in CA1 and dentate gyrus (DG) areas of hippocampus by exposing organotypic cultures to LY294002, a PI3K inhibitor, or to oxygen and glucose deprivation (OGD) for up to 21 hours. LY294002 induced increased propidium iodide (PI) uptake and caspase 3/7 activity in both regions, with a faster onset in DG. In contrast, cultures exposed to 60 min of OGD showed a PI uptake only in the CA1 area, beginning 13 h after the insult and increasing until 21 h. We did not observe any significant changes in AKT phosphorylation and immunocontent in CA1 or DG areas of organotypic cultures exposed to OGD, suggesting that the phosphorylation of this protein at Ser-473 is unrelated to the cellular damage induced by ischemia. Our results suggest that the inhibition of the PI3K pathway does not mimic the cell death profile observed with an ischemic model.
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