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The Journal of Neuroscience, March 1, 2002, 22(5):1523-1531

Astroglial Contribution to Brain Energy Metabolism in Humans Revealed by ¹³C Nuclear Magnetic Resonance Spectroscopy: Elucidation of the Dominant Pathway for Neurotransmitter Glutamate Repletion and Measurement of Astrocytic Oxidative Metabolism

Vincent Lebon^{1, 2}, Kitt F. Petersen², Gary W. Cline², Jun Shen⁶, Graeme F. Mason³, Sylvie Dufour^{1, 2}, Kevin L. Behar³, Gerald I. Shulman^{1, 2, 4}, and Douglas L. Rothman⁵

¹ Howard Hughes Medical Institute, Departments of ² Internal Medicine, ³ Psychiatry, ⁴ Cellular and Molecular Physiology, and ⁵ Diagnostic Radiology, Yale University School of Medicine, New Haven, Connecticut 06510, and ⁶ Division of Medical Physics, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York 10962

Increasing evidence supports a crucial role for glial metabolism in maintaining proper synaptic function and in the etiology of neurological disease. However, the study of glial metabolism in humans has been hampered by the lack of noninvasive methods. To specifically measure the contribution of astroglia to brain energy metabolism in humans, we used a novel noninvasive nuclear magnetic resonance spectroscopic approach. We measured carbon 13 incorporation into brain glutamate and glutamine in eight volunteers during an intravenous infusion of [2-¹³C] acetate, which has been shown in animal models to be metabolized specifically in astroglia. Mathematical modeling of the three established pathways for neurotransmitter glutamate repletion indicates that the glutamate/glutamine neurotransmitter cycle between astroglia and neurons (0.32 ± 0.07 µmol · gm¹ · min¹) is the major pathway for neuronal glutamate repletion and that the astroglial TCA cycle flux (0.14 ± 0.06 µmol · gm¹ · min¹) accounts for ~14% of brain oxygen consumption. Up to 30% of the glutamine transferred to the neurons by the cycle may derive from replacement of oxidized glutamate by anaplerosis. The further application of this approach could potentially enlighten the role of astroglia in supporting brain glutamatergic activity and in neurological and psychiatric disease.

Key words: human; brain; astrocyte; glutamate/glutamine cycle; TCA cycle; NMR; acetate

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Copyright © 2002 Society for Neuroscience  0270-6474/02/2251523-09$05.00/0

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