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Dehydroascorbic Acid Promotes Cell Death in Neurons Under Oxidative Stress: a Protective Role for Astrocytes

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Abstract

Ascorbic acid (AA), the reduced form of vitamin C, is incorporated into neurons via the sodium ascorbate co-transporter SVCT2. However, this transporter is not expressed in astrocytes, which take up the oxidized form of vitamin C, dehydroascorbic acid (DHA), via the facilitative hexose transporter GLUT1. Therefore, neuron and astrocyte interactions are thought to mediate vitamin C recycling in the nervous system. Although astrocytes are essential for the antioxidant defense of neurons under oxidative stress, a condition in which a large amount of ROS is generated that may favor the extracellular oxidation of AA and the subsequent neuronal uptake of DHA via GLUT3, potentially increasing oxidative stress in neurons. This study analyzed the effects of oxidative stress and DHA uptake on neuronal cell death in vitro. Different analyses revealed the presence of the DHA transporters GLUT1 and GLUT3 in Neuro2a and HN33.11 cells and in cortical neurons. Kinetic analyses confirmed that all cells analyzed in this study possess functional GLUTs that take up 2-deoxyglucose and DHA. Thus, DHA promotes the death of stressed neuronal cells, which is reversed by incubating the cells with cytochalasin B, an inhibitor of DHA uptake by GLUT1 and GLUT3. Additionally, the presence of glial cells (U87 and astrocytes), which promote DHA recycling, reverses the observed cell death of stressed neurons. Taken together, these results indicate that DHA promotes the death of stressed neurons and that astrocytes are essential for the antioxidative defense of neurons. Thus, the astrocyte-neuron interaction may function as an essential mechanism for vitamin C recycling, participating in the antioxidative defense of the brain.

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Abbreviations

AA:

Ascorbic acid

DHA:

Dehydroascorbic acid

DMEM:

Dulbecco’s modified Eagle’s medium

FBS:

Fetal bovine serum

DOG:

Deoxyglucose

GFAP:

Glial fibrillary acidic protein

GLUT:

Glucose transporter

GSH:

Glutathione

IMDM:

Iscove’s modified Dulbecco’s medium

PAGE:

Polyacrylamide gel electrophoresis

PBS:

Phosphate-buffered saline

ROS:

Reactive oxygen species

SDS:

Sodium dodecyl sulfate

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Acknowledgments

This work was supported by a grant from the Fondo Nacional de Ciencia y Tecnología (FONDECYT 1140477) to FN and Conicyt PIA ECM12. We thank Dr. Marjet Heitzer for critical reading and editing of the manuscript and Ms. Ximena Koch for technical support.

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Correspondence to Francisco Nualart.

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All animals were handled in strict accordance with the Animal Welfare Assurance (permit number: 2010101A), and all animal work was approved by the Ethics and Animal Care and Use Committee of the University of Concepcion, Chile. Female adult Sprague–Dawley rats were used for the experiments and were kept under a 12-h light/dark cycle with food and water provided ad libitum.

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The authors declare that they have no competing interests.

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Andrea García-Krauss and Luciano Ferrada contributed equally to this work.

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García-Krauss, A., Ferrada, L., Astuya, A. et al. Dehydroascorbic Acid Promotes Cell Death in Neurons Under Oxidative Stress: a Protective Role for Astrocytes. Mol Neurobiol 53, 5847–5863 (2016). https://doi.org/10.1007/s12035-015-9497-3

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