Predominant Enhancement of Glucose Uptake in Astrocytes versus Neurons during Activation of the Somatosensory Cortex

被引:166
作者
Chuquet, Julien [1 ]
Quilichini, Pascale [1 ]
Nimchinsky, Esther A. [1 ]
Buzsaki, Gyoergy [1 ]
机构
[1] Rutgers State Univ, Ctr Mol & Behav Neurosci, Newark, NJ 07102 USA
关键词
BRAIN ENERGY-METABOLISM; IN-VIVO; RAT-BRAIN; OXIDATIVE-METABOLISM; CELLULAR MECHANISMS; TRANSPORT; STIMULATION; RESPONSES; CELLS; IMMUNOHISTOCHEMISTRY;
D O I
10.1523/JNEUROSCI.0762-10.2010
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
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.
引用
收藏
页码:15298 / 15303
页数:6
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