Cited by 219Neuroscience and Neuropharmacology ResearchAdvanced MRI Techniques and ApplicationsNeuroinflammation and Neurodegeneration Mechanisms

Predominant enhancement of glucose uptake in astrocytes versus neurons during activation of the somatosensory cortex

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Chuquet, Julien, Quilichini, Pascale, Nimchinsky, Esther A., Buzsáki, György·2010·The Journal of Neuroscience

Abstract

Glucose is the primary energetic substrate of the brain, and measurements of its metabolism are the basis of major functional cerebral imaging methods. Contrary to the general view that neurons are fueled solely by glucose in proportion to their energetic needs, recent in vitro and ex vivo analyses suggest that glucose preferentially feeds astrocytes. However, the cellular fate of glucose in the intact brain has not yet been directly observed. We have used a real-time method for measuring glucose uptake in astrocytes and neurons in vivo in male rats by imaging the trafficking of the nonmetabolizable glucose analog 6-deoxy-N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)-aminoglucose (6-NBDG) using two-photon microscopy. During resting conditions we found that astrocytes and neurons both take up 6-NBDG at the same rate in the barrel cortex of the rat. However, during intense neuronal activity triggered by whisker stimulation, astrocytes rapidly accelerated their uptake, whereas neuronal uptake remained almost unchanged. After the stimulation period, astrocytes returned to their preactivation rates of uptake paralleling the neuronal rate of uptake. These observations suggest that glucose is taken up primarily by astrocytes, supporting the view that functional imaging experiments based on glucose analogs extraction may predominantly reflect the metabolic activity of the astrocytic network.

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Crossref · 10.1523/jneurosci.0762-10.2010

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  • 6-NBDG cannot be phosphorylated by hexokinase because the 6 position is occupied by the fluorophore.

    “The first study (Chuquet et al., 2010) used the fluorescent glucose analogue 6-NBDG; because it cannot be phosphorylated by hexokinase (given that the 6 position was already occupied by the fluorophore), this analogue’s accumulation may not correspond with the actual rate of glucose utilization, and it has been shown in some cases to correlate negatively with glucose utilization (DiNuzzo et al., 2”
  • Two recent in vivo studies monitoring glucose analogue accumulation in somatosensory cortex during whisker stimulation used two different glucose analogues and obtained opposite results.

    “Two recent in vivo studies monitored glucose analogue accumulation in somatosensory cortex during whisker stimulation; they used two different glucose analogues and obtained opposite results.”
  • 6-NBDG accumulation may not correspond with the actual rate of glucose utilization.

    “The first study (Chuquet et al., 2010) used the fluorescent glucose analogue 6-NBDG; because it cannot be phosphorylated by hexokinase (given that the 6 position was already occupied by the fluorophore), this analogue’s accumulation may not correspond with the actual rate of glucose utilization, and it has been shown in some cases to correlate negatively with glucose utilization (DiNuzzo et al., 2”
  • Upon whisker stimulation in anesthetized rats, 6-NBDG uptake into both cell types tended to increase, though only significantly for astrocytes.

    “Baseline accumulation of the analogue into astrocytes and neurons was similar; upon whisker stimulation in anesthetized rats, uptake into both cell types tended to increase, though only significantly for astrocytes (Chuquet et al., 2010).”
  • Baseline accumulation of 6-NBDG into astrocytes and neurons was similar.

    “Baseline accumulation of the analogue into astrocytes and neurons was similar; upon whisker stimulation in anesthetized rats, uptake into both cell types tended to increase, though only significantly for astrocytes (Chuquet et al., 2010).”

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Authors
Chuquet, J., Quilichini, P., Nimchinsky, E. A., & Buzsáki, G.
Affiliations
Rutgers, The State University of New Jersey (US)
Venue
The Journal of Neuroscience
Published
2010-11-10
Volume
30
Issue
45
Pages
15298-15303
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2009966509
Cited by
217
References
42
Citations by year
2026: 1 · 2025: 14 · 2024: 13 · 2023: 18 · 2022: 12 · 2021: 15 · 2020: 11 · 2019: 14 · 2018: 13 · 2017: 23 · 2016: 13 · 2015: 19 · 2014: 11 · 2013: 14 · 2012: 14
FWCI
5.05
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, cc-by)
Funders
  • National Institute on Deafness and Other Communication Disorders (R01DC009947)
  • National Institute of Neurological Disorders and Stroke (R01NS034994)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
astrocytes, neurons, glucose uptake, somatosensory cortex, barrel cortex, whisker stimulation, neuronal activation, two-photon microscopy, brain energy metabolism, functional neuroimaging
MeSH terms
Analysis of Variance, Animals, Astrocytes, Biological Transport, Glucose, Male, Neurons, Somatosensory Cortex, Vibrissae, Rats, Sprague-Dawley, Microscopy, Fluorescence, Multiphoton, Rats

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