Synaptic NMDA receptor activity boosts intrinsic antioxidant defenses

@article{Papadia2008SynapticNR,
  title={Synaptic NMDA receptor activity boosts intrinsic antioxidant defenses},
  author={Sofia Papadia and Francesc X. Soriano and Fr{\'e}d{\'e}ric L{\'e}veill{\'e} and Marc‐Andr{\'e} Martel and Kelly A. Dakin and Henrik H. Hansen and Angela M. Kaindl and Marco Sifringer and Jill H. Fowler and Vanya Stefovska and Grahame J. McKenzie and Marie Craigon and Roderick A. Corriveau and Peter Ghazal and Karen Horsburgh and Bruce A Yankner and David J. A. Wyllie and Chrysanthy Ikonomidou and Giles E. Hardingham},
  journal={Nature Neuroscience},
  year={2008},
  volume={11},
  pages={476-487},
  url={https://api.semanticscholar.org/CorpusID:4667922}
}
It is found that in rat neurons, synaptic activity, acting via NMDA receptor (NMDAR) signaling, boosted antioxidant defenses by making changes to the thioredoxin-peroxiredoxin system by influencing the progression of pathological processes associated with oxidative damage.

Excitotoxic insults lead to peroxiredoxin hyperoxidation

The effect of NMDA receptor activity on the activity of neuronal peroxiredoxins follows the classical U-shaped dose response curve, and it is shown that while too little glutamatergic activity can render neurons vulnerable toperoxiredoxin hyperoxidation, so can too much.

Synaptic and Extrasynaptic NMDA Receptors Differentially Modulate Neuronal Cyclooxygenase-2 Function, Lipid Peroxidation, and Neuroprotection

A new paradigm emerges from the results suggesting that pathological COX-2 signaling associated with models of stroke, epilepsy, and neurodegeneration requires specific spatiotemporal NMDAR stimulation.

Synaptic NMDA receptor activity is coupled to the transcriptional control of the glutathione system

It is demonstrated that synaptic activity is coupled to transcriptional control of the glutathione antioxidant system via NMDA receptors, enabling neurons to tune their antioxidant defenses.

Astrocyte NMDA receptors' activity sustains neuronal survival through a Cdk5–Nrf2 pathway

The antioxidant defense of neurons is repressed owing to the continuous protein destabilization of the master antioxidant transcriptional activator, nuclear factor-erythroid 2-related factor-2 (Nrf2), and Nrf2 is highly stable in neighbor astrocytes explaining their robust antioxidant defense and resistance against oxidative stress.

Neuronal activity regulates astrocytic Nrf2 signaling

Activity of the Nrf2 pathway in the brain is fine-tuned through a regulatory loop between neurons and astrocytes, and regulation of endogenous antioxidant signaling is one of the functions of the neuron–astrocyte tripartite synapse.

Neuronal Activity and Its Role in Controlling Antioxidant Genes

It is proposed that neurons interpret Ca2+ signals in a similar way to other cell types sense redox imbalance, to broadly induce antioxidant and detoxification genes.

Synaptic NMDA Receptors Mediate Hypoxic Excitotoxic Death

The results suggest that synaptic NMDARs can mediate excitotoxicity, particularly when the glutamate source is synaptic and when synaptic receptor contributions are rigorously defined.

Synaptic Activity Protects Neurons Against Calcium-Mediated Oxidation and Contraction of Mitochondria During Excitotoxicity.

It is found that synaptic activity protects primary rat hippocampal neurons against acute excitotoxicity-induced mitochondrial oxidative stress and mitochondrial contraction associated with it and highlights the importance of developing means of blocking mitochondrial calcium overload for therapeutic targeting of oxidative Stress and mitochondrial dysfunction in neurodegenerative diseases.

Coupling of the NMDA receptor to neuroprotective and neurodestructive events.

Increased understanding in this field is leading to the discovery of new therapeutic targets and strategies for excitotoxic disorders, as well as a growing appreciation of the harmful consequences of NMDA receptor blockade.
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Preconditioning Doses of NMDA Promote Neuroprotection by Enhancing Neuronal Excitability

Exposure to low preconditioning doses of NMDA results in preferential activation of synaptic NMDA receptors because of a dramatic increase in action potential firing, in apparent contradiction with recent findings that extrasynaptic NMDA receptor signaling exerts a dominant inhibitory effect on prosurvival signaling from synapticNMDA receptors.

Extrasynaptic NMDARs oppose synaptic NMDARs by triggering CREB shut-off and cell death pathways

Here we report that synaptic and extrasynaptic NMDA (N-methyl-D-aspartate) receptors have opposite effects on CREB (cAMP response element binding protein) function, gene regulation and neuron

NMDA Receptor Subunits Have Differential Roles in Mediating Excitotoxic Neuronal Death Both In Vitro and In Vivo

The present work provides a molecular basis for the dual roles of NMDA receptors in promoting neuronal survival and mediating neuronal damage and suggests that selective enhancement of NR2A-containing NMDA receptor activation with glycine may constitute a promising therapy for stroke.

The Dichotomy of NMDA Receptor Signaling

There is a growing understanding of the signaling events that mediate the opposing effects of NMDA-receptor activity and the factors that determine whether an episode ofNMDA- receptor activity will promote survival or death, which may lead to therapeutic strategies that enable the selective blockade of prodeath signaling cassettes while sparing physiological signaling to survival and plasticity.

Diminished Neuronal Activity Increases Neuron-Neuron Connectivity Underlying Silent Synapse Formation and the Rapid Conversion of Silent to Functional Synapses

It is shown that diminution of network activity in mature neuronal circuit promotes reorganization of neuronal circuits via NR2B subunit-containing NMDA-type glutamate receptors (NR2B-NMDARs), which mediate silent synapse formation in mature neurons.

Mitochondrial peroxiredoxin‐3 protects hippocampal neurons from excitotoxic injury in vivo

In vivo adenoviral gene transfer of Prx‐3 completely inhibited protein nitration and markedly reduced gliosis, a post‐neuronal cell death event, and suggest that Prx-3 up‐regulation might be a useful novel approach for the management of neurodegenerative diseases.

Hyperglycemia Promotes Oxidative Stress through Inhibition of Thioredoxin Function by Thioredoxin-interacting Protein*

It is shown that hyperglycemia inhibits thioredoxin ROS-scavenging function through p38 MAPK-mediated induction of Txnip, a ubiquitous antioxidative mechanism for regulating cellular redox balance that interacts with an endogenous inhibitor, thiOREDoxin-interacting protein (Txnip).

The chemical biology of clinically tolerated NMDA receptor antagonists

Most neuroprotective drugs have failed in clinical trials because of side‐effects, causing normal brain function to become compromised. A case in point concerns antagonists of the

S-nitrosylation of peroxiredoxin 2 promotes oxidative stress-induced neuronal cell death in Parkinson's disease

It is reported that Prx2 is S-nitrosylated by reaction with nitric oxide at two critical cysteine residues, preventing its reaction with peroxides, providing a direct link between nitrosative/oxidative stress and neurodegenerative disorders such as PD.
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