期刊
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
卷 41, 期 2, 页码 282-297出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0271678X20910535
关键词
H-1-[C-13]-MRS; neuronal metabolism; metabolic modeling; TCA cycle; mouse hippocampus
资金
- Center for Biomedical Imaging (CIBM) of the University of Lausanne (UNIL)
- University of Geneva (UNIGE)
- Geneva University Hospital (HUG)
- Lausanne University Hospital (CHUV)
- Swiss Federal Institute of Technology (EPFL)
- Louis-Jeantet Foundation
- Swiss National Science Foundation [31003A_149983]
- Leenaards Foundation
- Swiss National Science Foundation (SNF) [31003A_149983] Funding Source: Swiss National Science Foundation (SNF)
This study aimed to assess excitatory and inhibitory neuronal metabolism in the mouse hippocampus using various techniques, revealing a significant contribution of GABAergic activity and a higher metabolic ratio for inhibitory neurons compared to excitatory neurons. The results provide new insights and tools for advancing C-13-MRS applications in specific brain regions of small animals.
Hippocampus plays a critical role in linking brain energetics and behavior typically associated to stress exposure. In this study, we aimed to simultaneously assess excitatory and inhibitory neuronal metabolism in mouse hippocampus in vivo by applying (18)FDG-PET and indirect C-13 magnetic resonance spectroscopy (H-1-[C-13]-MRS) at 14.1 T upon infusion of uniformly C-13-labeled glucose ([U-C-13(6)]Glc). Improving the spectral fitting by taking into account variable decoupling efficiencies of [U-C-13(6)]Glc and refining the compartmentalized model by including two gamma-aminobutyric acid (GABA) pools permit us to evaluate the relative contributions of glutamatergic and GABAergic metabolism to total hippocampal neuroenergetics. We report that GABAergic activity accounts for similar to 13% of total neurotransmission (V-NT) and similar to 27% of total neuronal TCA cycle (V-TCA) in mouse hippocampus suggesting a higher V-TCA/V-NT ratio for inhibitory neurons compared to excitatory neurons. Finally, our results provide new strategies and tools for bringing forward the developments and applications of C-13-MRS in specific brain regions of small animals.
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