Journal
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
Volume 25, Issue 11, Pages 1418-1423Publisher
SAGE PUBLICATIONS INC
DOI: 10.1038/sj.jcbfm.9600145
Keywords
glycolysis; NMR; PET; primate brain; TCA cycle
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The glycolytic flux (cerebral metabolic rate of glucose CMRglc) and the TCA cycle flux (VTCA) were measured in the same monkeys by F-18-fluorodeoxyglucose (F-18-FDG) positron emission tomography (PET) and C-13 NMR spectroscopy, respectively. Registration of nuclear magnetic resonance (NMR) and PET data were used for comparison of CMRglc and VTCA in the exact same area of the brain. Both fluxes were in good agreement with literature values (CMRglc = 0.23 +/- 0.03 mu mol/g min, V-TCA = 0.53 +/- 0.13 mu mol/g min). The resulting [CMRglclV(TCA)] ratio was 0.46 +/- 0.12 (n = 5, mean +/- s.d.), not significantly different from the 0.5 expected when glucose is the sole fuel that is completely oxidized. Our results provide a cross-validation of both techniques. Comparison of CMRglc with V-TCA is in agreement with a metabolic coupling between the TCA cycle and glycolysis under normal physiologic conditions.
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