Linked Life Data

19278624

Source:http://linkedlifedata.com/resource/pubmed/id/19278624

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pubmed-article:19278624pubmed:abstractTextReactive oxygen species such as hydrogen peroxide (H(2)O(2)) are involved in many cellular processes that positively and negatively regulate cell fate. H(2)O(2), acting as an intracellular messenger, activates phosphatidylinositol-3 kinase (PI3K) and its downstream target Akt, and promotes cell survival. The aim of the current study was to understand the mechanism by which PI3K/Akt signaling promotes survival in SH-SY5Y neuroblastoma cells. We demonstrate that PI3K/Akt mediates phosphorylation of the pro-apoptotic Bcl-2 family member Bax. This phosphorylation suppresses apoptosis and promotes cell survival. Increased survival in the presence of H(2)O(2) was blocked by LY294002, an inhibitor of PI3K activation. LY294002 prevented Bax phosphorylation and resulted in Bax translocation to the mitochondria, cytochrome c release, caspase-3 activation, and cell death. Collectively, these findings reveal a mechanism by which H(2)O(2)-induced activation of PI3K/Akt influences post-translational modification of Bax and inactivates a key component of the cell death machinery.lld:pubmed
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