TY - JOUR
T1 - Mapping of glutamate metabolism using 1H FID-MRSI after oral administration of [1-13C]Glc at 9.4 T
AU - Ziegs, Theresia
AU - Ruhm, Loreen
AU - Wright, Andrew
AU - Henning, Anke
N1 - Funding Information:
The study was funded by European Research Council (ERC) (Grant No. 679927 to T.Z., L.R., A.M.W., and A.H.) and Cancer Prevention and Research Institute of Texas (CPRIT) (Grant No. RR180056 to A.H.)
Publisher Copyright:
© 2023
PY - 2023/4/15
Y1 - 2023/4/15
N2 - Glutamate is the major excitatory transmitter in the brain and malfunction of the related metabolism is associated with various neurological diseases and disorders. The observation of labeling changes in the spectra after the administration of a 13C labelled tracer is a common tool to gain better insights into the function of the metabolic system. But so far, only a very few studies presenting the labeling effects in more than two voxels to show the spatial dependence of metabolism. In the present work, the labeling effects were measured in a transversal plane in the human brain using ultra-short TE and TR 1H FID-MRSI. The measurement set-up was most simple: The [1-13C]Glc was administered orally instead of intravenous and the spectra were measured with a pure 1H technique without the need of a 13C channel (as Boumezbeur et al. demonstrated in 2004). Thus, metabolic maps and enrichment curves could be obtained for more metabolites and in more voxels than ever before in human brain. Labeling changes could be observed in [4–13C]glutamate, [3–13C]glutamate+glutamine, [2–13C]glutamate+glutamine, [4–13C]glutamine, and [3–13C]aspartate with a high temporal (3.6 min) and spatial resolution (32 × 32 grid with nominal voxel size of 0.33 µL) in five volunteers.
AB - Glutamate is the major excitatory transmitter in the brain and malfunction of the related metabolism is associated with various neurological diseases and disorders. The observation of labeling changes in the spectra after the administration of a 13C labelled tracer is a common tool to gain better insights into the function of the metabolic system. But so far, only a very few studies presenting the labeling effects in more than two voxels to show the spatial dependence of metabolism. In the present work, the labeling effects were measured in a transversal plane in the human brain using ultra-short TE and TR 1H FID-MRSI. The measurement set-up was most simple: The [1-13C]Glc was administered orally instead of intravenous and the spectra were measured with a pure 1H technique without the need of a 13C channel (as Boumezbeur et al. demonstrated in 2004). Thus, metabolic maps and enrichment curves could be obtained for more metabolites and in more voxels than ever before in human brain. Labeling changes could be observed in [4–13C]glutamate, [3–13C]glutamate+glutamine, [2–13C]glutamate+glutamine, [4–13C]glutamine, and [3–13C]aspartate with a high temporal (3.6 min) and spatial resolution (32 × 32 grid with nominal voxel size of 0.33 µL) in five volunteers.
KW - Glutamatergic metabolism
KW - Human brain
KW - Proton magnetic resonance spectroscopy imaging
KW - Ultra-high field strengths
KW - [1-13C]Glc labeling
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U2 - 10.1016/j.neuroimage.2023.119940
DO - 10.1016/j.neuroimage.2023.119940
M3 - Article
C2 - 36787828
AN - SCOPUS:85148364104
SN - 1053-8119
VL - 270
JO - NeuroImage
JF - NeuroImage
M1 - 119940
ER -