Cited by 196Genomics, phytochemicals, and oxidative stressRedox biology and oxidative stressEndoplasmic Reticulum Stress and Disease

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

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Jimenez-Blasco, D, Santofimia-Castaño, P, Gonzalez, A, Almeida, A, Bolaños, J P·2015·Cell Death & Differentiation

Abstract

Neurotransmission unavoidably increases mitochondrial reactive oxygen species. However, the intrinsic antioxidant defense of neurons is weak and hence the mechanism whereby these cells are physiologically protected against oxidative damage is unknown. Here we found that 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). By contrast, Nrf2 is highly stable in neighbor astrocytes explaining their robust antioxidant defense and resistance against oxidative stress. We also show that subtle and persistent stimulation of N-methyl-d-aspartate receptors (NMDAR) in astrocytes, through a mechanism not requiring extracellular Ca²⁺ influx, upregulates a signal transduction pathway involving phospholipase C-mediated endoplasmic reticulum release of Ca²⁺ and protein kinase Cδ activation. Active protein kinase Cδ promotes, by phosphorylation, the stabilization of p35, a cyclin-dependent kinase-5 (Cdk5) cofactor. Active p35/Cdk5 complex in the cytosol phosphorylates Nrf2 at Thr(395), Ser(433) and Thr(439) that is sufficient to promote Nrf2 translocation to the nucleus and induce the expression of antioxidant genes. Furthermore, this Cdk5-Nrf2 transduction pathway boosts glutathione metabolism in astrocytes efficiently protecting closely spaced neurons against oxidative damage. Thus, intercellular communication through NMDAR couples neurotransmission with neuronal survival.

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  1. Bossy-Wetzel E, Schwarzenbacher R, Lipton SA. Molecular pathways to neurodegenera- tion. Nat Med 2004; 10: S2-S9.
  2. Conti F, DeBiasi S, Minelli A, Melone M. Expression of NR1 and NR2A/B subunits of the NMDA receptor in cortical astrocytes. Glia 1996; 17: 254-258.

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Authors
Jimenez-Blasco, D., Santofimia-Castaño, P., Gonzalez, A., Almeida, A., & Bolaños, J. P.
Affiliations
Consejo Superior de Investigaciones Científicas (ES)
Corresponding author
Bolaños, J P
Venue
Cell Death & Differentiation
Published
2015-04-24
Volume
22
Issue
11
Pages
1877-1889
ISSN
  • 1350-9047 (ISSN-L)
  • 1476-5403
OpenAlex
W2111623179
Cited by
196
References
57
Citations by year
2026: 13 · 2025: 18 · 2024: 18 · 2023: 22 · 2022: 18 · 2021: 26 · 2020: 18 · 2019: 17 · 2018: 17 · 2017: 15 · 2016: 9 · 2015: 5
FWCI
6.65
Type
journal article
Language
en
Open access
Locations
  • Cell Death and Differentiation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
Funders
  • European Commission (608381)
  • Junta de Extremadura (GR10010)
  • National Institutes of Health (5r21da037678-02)
  • Instituto de Salud Carlos III (RD12/0014, RD12/0043/0021, RD12/0014/0007, RD12/0043)
  • European Regional Development Fund (GR10010, RD12/0014)
  • National Institute on Drug Abuse (1R21DA037678-01, R21 DA037678)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
Keywords
astrocytes, NMDA receptor, Nrf2, cyclin-dependent kinase 5, p35, oxidative stress, antioxidant defense, glutathione metabolism, intercellular communication, neuronal survival, phospholipase C, endoplasmic reticulum calcium release, protein kinase C delta, Nrf2 phosphorylation, mitochondrial reactive oxygen species, neurotransmission
MeSH terms
Animals, Astrocytes, Cell Survival, Cells, Cultured, Flow Cytometry, Humans, Hydrogen Peroxide, Lipids, Neurons, Blotting, Western, Signal Transduction, Receptors, N-Methyl-D-Aspartate, Rats, Wistar, Immunoprecipitation, NF-E2-Related Factor 2, Cyclin-Dependent Kinase 5, Rats, Membrane Potential, Mitochondrial, HEK293 Cells

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