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• W2074161856 abstract "Poly(ADP-ribose)-1 (PARP-1) is a key mediator of cell death in excitotoxicity, ischemia, and oxidative stress. PARP-1 activation leads to cytosolic NAD + depletion and mitochondrial release of apoptosis-inducing factor (AIF), but the causal relationships between these two events have been difficult to resolve. Here, we examined this issue by using extracellular NAD + to restore neuronal NAD + levels after PARP-1 activation. Exogenous NAD + was found to enter neurons through P2X 7 -gated channels. Restoration of cytosolic NAD + by this means prevented the glycolytic inhibition, mitochondrial failure, AIF translocation, and neuron death that otherwise results from extensive PARP-1 activation. Bypassing the glycolytic inhibition with the metabolic substrates pyruvate, acetoacetate, or hydroxybutyrate also prevented mitochondrial failure and neuron death. Conversely, depletion of cytosolic NAD + with NAD + glycohydrolase produced a block in glycolysis inhibition, mitochondrial depolarization, AIF translocation, and neuron death, independent of PARP-1 activation. These results establish NAD + depletion as a causal event in PARP-1-mediated cell death and place NAD + depletion and glycolytic failure upstream of mitochondrial AIF release." @default.
• W2074161856 created "2016-06-24" @default.
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• W2074161856 date "2010-02-24" @default.
• W2074161856 modified "2023-09-30" @default.
• W2074161856 title "NAD⁺Depletion Is Necessary and Sufficient forPoly(ADP-Ribose) Polymerase-1-Mediated Neuronal Death" @default.
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• W2074161856 doi "https://doi.org/10.1523/jneurosci.5552-09.2010" @default.
• W2074161856 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2864043" @default.
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