Cited by 254Neuroscience and Neuropharmacology ResearchAmino Acid Enzymes and MetabolismMetabolism, Diabetes, and Cancer

Glutamate triggers rapid glucose transport stimulation in astrocytes as evidenced by real-time confocal microscopy.

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Loaiza, Anitsi, Porras, Omar H., Barros, Luis Felipe·2003·The Journal of Neuroscience

Abstract

Glutamate stimulates glycolysis in astrocytes, a phenomenon that couples astrocytic metabolism with neuronal activity. However, it is not known whether glutamate also affects glucose transporter-1 (GLUT1), the transporter responsible for glucose entry into astrocytes. To address this question, two different real-time single-cell hexose uptake assays were applied to cultured hippocampal astrocytes using confocal epifluorescence microscopy. Glutamate caused a twofold to threefold increase in the zero-trans uptake rates of the fluorescent hexoses 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-2-deoxyglucose (2-NBDG) and 6-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-6-deoxyglucose (6-NBDG). Galactose uptake, determined by the calcein volumetric assay, was stimulated to a similar extent, confirming the fluorescent hexose data, and also demonstrating that glutamate stimulation is a Vmax effect. Remarkably, glucose transport stimulation developed fully inside 10 sec, which is 100 times faster than acute stimulations of glucose transport in other cell types. Glutamate did not significantly affect the rate of 6-NBDG uptake by GLUT1-expressing epithelial Clone 9 cells, suggesting that an astrocyte-specific factor is required for transport stimulation. We conclude that glucose transport stimulation occurs early during astrocytic activation by glutamate, which provides a novel regulatory node to current models of brain energy metabolism. This mechanism should also be considered for the interpretation of functional imaging data based on hexoses.

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Crossref · 10.1523/jneurosci.23-19-07337.2003

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Authors
Loaiza, A., Porras, O. H., & Barros, L. F.
Affiliations
Centro de Estudios Científicos (CL)
Venue
The Journal of Neuroscience
Published
2003-08-13
Volume
23
Issue
19
Pages
7337-7342
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2119476349
Cited by
254
References
34
Citations by year
2026: 3 · 2025: 7 · 2024: 6 · 2023: 11 · 2022: 11 · 2021: 10 · 2020: 10 · 2019: 15 · 2018: 8 · 2017: 14 · 2016: 13 · 2015: 10 · 2014: 13 · 2013: 13 · 2012: 9
FWCI
3.24
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Tinker Foundation
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
glutamate, glucose transport, GLUT1, astrocytes, astrocyte-neuron interaction, glycolysis, hippocampal astrocytes, 2-NBDG, galactose uptake, brain energy metabolism, astrocyte activation
MeSH terms
Animals, Astrocytes, Biological Transport, Deoxyglucose, Fluorescent Dyes, Glucosamine, Glucose, Hippocampus, Kinetics, 4-Chloro-7-nitrobenzofurazan, Neurons, Rats, Sprague-Dawley, Microscopy, Confocal, Glutamic Acid, Coculture Techniques, Rats

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