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  Metabolic Challenge to Glia Activates an Adenosine-Mediated Safety Mechanism that Promotes Neuronal Survival by Delaying the Onset of Spreading Depression Waves

Canals, S., Larrosa, B., Pintor, J., Mena, M., & Herreras, O. (2008). Metabolic Challenge to Glia Activates an Adenosine-Mediated Safety Mechanism that Promotes Neuronal Survival by Delaying the Onset of Spreading Depression Waves. Journal of Cerebral Blood Flow and Metabolism, 28(11), 1835-1844. doi:10.1038/jcbfm.2008.71.

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Canals, S1, 2, Author              
Larrosa, B, Author
Pintor, J, Author
Mena, MA, Author
Herreras, O, Author
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: In a model of glial-specific chemical anoxia, we have examined how astrocytes influence both synaptic transmission and the viability of hippocampal pyramidal neurons. This relationship was assessed using electrophysiological, pharmacological, and biochemical techniques in rat slices and cell cultures, and oxidative metabolism was selectively impaired in glial cells by exposure to the mitochondrial gliotoxin, fluoroacetate. We found that synaptic transmission was blocked shortly after inducing glial metabolic stress and peri-infarct-like spreading depression (SD) waves developed within 1 to 2 h of treatment. Neuronal electrogenesis was not affected until SD waves developed, thereafter decaying irreversibly. The blockage of synaptic transmission was totally reversed by A1 adenosine receptor antagonists, unlike the development of SD waves, which appeared earlier under these conditions. Such blockage led to a marked reduction in the electrical viability of pyramidal neurons 1 h after gliotoxin treatment. Cell culture experiments confirmed that astrocytes indeed release adenosine. We interpret this early glial response as a novel safety mechanism that allocates metabolic resources to vital processes when the glia itself sense an energy shortage, thereby delaying or preventing entry into massive lethal ischemic-like depolarization. The implication of these results on the functional recovery of the penumbra regions after ischemic insults is discussed.

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 Dates: 2008-11
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1038/jcbfm.2008.71
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Title: Journal of Cerebral Blood Flow and Metabolism
Source Genre: Journal
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Publ. Info: New York : Lippincott Williams & Wilkins
Pages: - Volume / Issue: 28 (11) Sequence Number: - Start / End Page: 1835 - 1844 Identifier: ISSN: 0271-678X
CoNE: https://pure.mpg.de/cone/journals/resource/954925503202