GDH-Dependent Glutamate Oxidation in the Brain Dictates Peripheral Energy Substrate Distribution
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Glucose, the main energy substrate used in the CNS, is continuously supplied by the periphery. Glutamate, the major excitatory neurotransmitter, is foreseen as a complementary energy contributor in the brain. In particular, astrocytes actively take up glutamate and may use it through oxidative glutamate dehydrogenase (GDH) activity. Here, we investigated the significance of glutamate as energy substrate for the brain. Upon glutamate exposure, astrocytes generated ATP in a GDH-dependent way. The observed lack of glutamate oxidation in brain-specific GDH null CnsGlud1(-/-) mice resulted in a central energy-deprivation state with increased ADP/ATP ratios and phospho-AMPK in the hypothalamus. This induced changes in the autonomous nervous system balance, with increased sympathetic activity promoting hepatic glucose production and mobilization of substrates reshaping peripheral energy stores. Our data reveal the importance of glutamate as necessary energy substrate for the brain and the role of central GDH in the regulation of whole-body energy homeostasis.
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GLUD1 and GLUD2 are involved in energy homeostasis.
“GLUD1 and GLUD2, which are involved in energy homeostasis36,37.”
From Oxytocin pathway gene networks in the human brain (2019) · cites this paper as [36]
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- Authors
- Karaca, M., Frigerio, F., Migrenne, S., Martin-Levilain, J., Skytt, D. M., Pajecka, K., Martin-del-Rio, R., Gruetter, R., Tamarit-Rodriguez, J., Waagepetersen, H. S., Magnan, C., & Maechler, P.
- Affiliations
- University of Geneva (CH)
- University of Copenhagen (DK)
- Corresponding author
- Maechler, Pierre
- Venue
- Cell Reports
- Publisher
- Elsevier BV
- Published
- 2015-10
- Volume
- 13
- Issue
- 2
- Pages
- 365-375
- ISSN
- 2211-1247 (ISSN-L)
- OpenAlex
- W2106619430
- Cited by
- 60
- References
- 74
- Citations by year
- 2025: 3 · 2024: 3 · 2023: 6 · 2022: 2 · 2021: 8 · 2020: 4 · 2019: 4 · 2018: 8 · 2017: 11 · 2016: 11
- FWCI
- 4.67
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Cell Reports (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (publishedVersion, other-oa)
- Archive ouverte UNIGE (University of Geneva) (publishedVersion, other-oa)
- Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion)
- Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
- Funders
- National Science Foundation
- Sundhed og Sygdom, Det Frie Forskningsråd
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (146984, 135704)
- H. Lundbeck A/S
- Medical Research Council
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
- Keywords
- glutamate oxidation, glutamate dehydrogenase, astrocytes, brain energy metabolism, ATP/ADP ratio, AMPK, hypothalamus, sympathetic nervous system, hepatic glucose production
- MeSH terms
- Adenosine Triphosphate, Animals, Astrocytes, Cells, Cultured, Energy Metabolism, Glucose, Glutamate Dehydrogenase, Hypothalamus, Liver, Male, Oxidation-Reduction, Receptors, Glutamate, Glutamic Acid, Mice
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