Localized in vivo 1H NMR detection of neurotransmitter labeling in rat brain during infusion of [1-13C] D-glucose

Josef Pfeuffer, Ivan Tkáč, In Young Choi, Hellmut Merkle, Kâmil Uǧurbil, Michael Garwood, Rolf Gruetter

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

Resolved localized nuclear magnetic resonance (NMR) signals of 1H bound to 13C label in the carbon positions of glutamate C4, C3 and glutamine C4, C3, as well as in aspartate C3, lactate C3, alanine C3, γ,-aminobutyric acid C3, and glucose C1 were simultaneously observed in spectra obtained from rat brain in vivo. Time-resolved label incorporation was measured with a new adiabatic carbon editing and decoupling (ACED) single-voxel stimulated echo acquistion mode (STEAM) sequence. Adiabatic carbon broadband decoupling of 12 kHz bandwidth was achieved in vivo, which decoupled the entire 13C spectrum at 9.4 T. Resonances from N-acetyl-aspartate and creatine were also detected, consistent with natural-abundance 13C levels. These results emphasize the potential of 1H NMR for following complex biochemical pathways in localized areas of resting rat brain as well as during focal activation using infusions of 13C-labeled glucose.

Original languageEnglish (US)
Pages (from-to)1077-1083
Number of pages7
JournalMagnetic resonance in medicine
Volume41
Issue number6
DOIs
StatePublished - 1999

Keywords

  • ACED-STEAM
  • Adiabatic broadband decoupling
  • Localized C editing
  • Neurotransmitter labeling
  • [1-C] glucose infusion

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