Imaging of glutamate in the spinal cord using GluCEST

Feliks Kogan, Anup Singh, Catherine Debrosse, Mohammad Haris, Kejia Cai, Ravi Prakash Nanga, Mark Elliott, Hari Hariharan, Ravinder Reddy

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45 Citations (Scopus)

Abstract

Glutamate (Glu) is the most abundant excitatory neurotransmitter in the brain and spinal cord. The concentration of Glu is altered in a range of neurologic disorders that affect the spinal cord including multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS) and spinal cord injury. Currently available magnetic resonance spectroscopy (MRS) methods for measuring Glu are limited to low spatial resolution, which makes it difficult to measure differences in gray and white matter glutamate. Recently, it has been shown that Glu exhibits a concentration dependent chemical exchange saturation transfer (CEST) effect between its amine (-NH2) group protons and bulk water protons (GluCEST). Here, we demonstrate the feasibility of imaging glutamate in the spinal cord at 7T using the GluCEST technique. Results from healthy human volunteers (N=7) showed a significantly higher (p<0.001) GluCESTasym from gray matter (6.6±0.3%) compared to white matter (4.8±0.4%). Potential overlap of CEST signals from other spinal cord metabolites with the observed GluCESTasym is discussed. This noninvasive approach potentially opens the way to image Glu in vivo in the spinal cord and to monitor its alteration in many disease conditions.

Original languageEnglish
Pages (from-to)262-267
Number of pages6
JournalNeuroImage
Volume77
DOIs
Publication statusPublished - 15 Aug 2013
Externally publishedYes

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Keywords

  • Chemical exchange saturation transfer
  • Glutamate
  • MRI
  • Spinal cord

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Neurology

Cite this

Kogan, F., Singh, A., Debrosse, C., Haris, M., Cai, K., Nanga, R. P., Elliott, M., Hariharan, H., & Reddy, R. (2013). Imaging of glutamate in the spinal cord using GluCEST. NeuroImage, 77, 262-267. https://doi.org/10.1016/j.neuroimage.2013.03.072