Direct neuronal glucose uptake Heralds activity-dependent increases in cerebral metabolism

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Iben Lundgaard, Baoman Li, Lulu Xie, Hongyi Kang, Simon Sanggaard, John D R Haswell, Wei Sun, Siri Goldman, Solomiya Blekot, Michael Nielsen, Takahiro Takano, Rashid Deane, Maiken Nedergaard

Metabolically, the brain is a highly active organ that relies almost exclusively on glucose as its energy source. According to the astrocyte-to-neuron lactate shuttle hypothesis, glucose is taken up by astrocytes and converted to lactate, which is then oxidized by neurons. Here we show, using two-photon imaging of a near-infrared 2-deoxyglucose analogue (2DG-IR), that glucose is taken up preferentially by neurons in awake behaving mice. Anaesthesia suppressed neuronal 2DG-IR uptake and sensory stimulation was associated with a sharp increase in neuronal, but not astrocytic, 2DG-IR uptake. Moreover, hexokinase, which catalyses the first enzymatic steps in glycolysis, was highly enriched in neurons compared with astrocytes, in mouse as well as in human cortex. These observations suggest that brain activity and neuronal glucose metabolism are directly linked, and identify the neuron as the principal locus of glucose uptake as visualized by functional brain imaging.

OriginalsprogEngelsk
Artikelnummer6807
TidsskriftNature Communications
Vol/bind6
Antal sider12
ISSN2041-1723
DOI
StatusUdgivet - 2015

ID: 152955979